Obs1997

1997 Visual Comet & CCD Observations
Año 1997 – Observacions Visuales y CCD de Cometas

C/1995 O1 (Hale-Bopp)
1997 June 23.44 UT: m1=2.8:, Dia.=--, DC=7 ... 20x80 B ... Andrew Pearce (City Beach, Western Australia) [Comet only 3 deg above sea horizon and still reasonably bright and condensed. Elongation of the coma suggests that the tail is still visible ]
1997 June 18.33 UT: m1=3.0, Dia.=~7' ... 7x50 B ... Michael Brown (Melbourne, Australia) [Magnitude estimate corrected for atmospheric extinction. <0.2 deg of tail visible but site is light polluted]
1997 June 16.44 UT: m1=2.7, Dia.=8', DC=7 ... 20x80 B ... Andrew Pearce (City Beach, Western Australia) [Magnitude estimate corrected for atmospheric extinction. Approximately 0.3 deg of a broad tail in PA 140 deg visible. Very intense central condensation visible in 20-cm reflector. Tail is very broad and subtends an arc of approximately 70 degs centred on PA 140 deg which shows a distinct curvature to the east with increasing distance from the coma. Tail of high surface brightNaked Eyess which makes it difficult to distinguish between coma and tail in 20x80B. ]
1997 June 15.44 UT: m1=2.5, Dia.=9', DC=6.5 ... 20x80 B ... Andrew Pearce (City Beach, Western Australia) [Magnitude estimate corrected for atmospheric extinction. Approximately 0.5 deg of a broad tail in PA 140 deg visible.]
1997 June 09.43 UT: m1=2.6, Dia.=8', DC=8 ... 20x80 B ... Andrew Pearce (Subiaco, Western Australia) [Magnitude estimate corrected for atmospheric extinction. Approximately 1 deg of broad tail in PA 130 deg visible. This is the first night of semi clear skies for over a week which is unusual for Perth! ]
1997 June 07.89 UT: m1=2.2, Dia.=15', DC=5/ , Tail= 2 deg in PA 110(dust) Ion(130) ... 20X80 B ... Romualdo Lourencon and Adriana Pinedo (Itupeva, SP, Brazil ) [Estimate corrected for extinction]
1997 June 07.89 UT: m1=2.1, Dia.=15', DC=6/, and ion tail with 2.5 deg., dust tail with 3.0 deg. ... 11x80 B ... Jose Guilherme de S. Aguiar (Campinas, Brazil) [the dust tail is very curved and white color (in the last week your color was yellow)]
1997 June 07.34 UT: ml=1.9, Dia.=~10', DC=8, Tail= 2 deg. ... naked eye ... Terry Lovejoy (Mt Cootha, Brisbane, Australia) [Comet is still obvious with naked eye although tail has become still weaker. In 10x50 binoculars as much as 3-4 degrees of dust tail is observed - the first half a degree is bright. Comet Encke possibly also sighted in 10x50 binoculars but observation very Mar.ginal and not confirmed - Hale-Bopp is much brighter!]
1997 June 04.34 UT: m1=2.2, DC=8, Tail=~1 deg. ... 12x50 B ... Michael Brown (Woodend, Victoria, Australia) [Extinction corrected with ICQ table. Dust tail ~3 deg long in 11.4-cm L]
1997 June 03.43 UT: m1=2.4, DC=8 ... 20x80 B ... Andrew Pearce (City Beach, Western Australia) [Magnitude estimate corrected for atmospheric extinction. Hurried observation made through breaks in cloud. Tail still easily visible in binoculars.]
1997 June 03.33 UT: ml=2.5, Dust Tail 0.5 degrees ... Naked Eye ... Zelko Karlovic, (Melbourne Planetarium, Richmond, MelbourNaked Eye, Australia) [I was surprised to see Hale-Bopp this close to the centre of the central busiNaked Eyess district and looking across through the light pollution of MelbourNaked Eye's city lights. Comet disappeared into the city glow half an hour later when only 4-5 degrees above the horizon at this time even delta, epsilon and zeta Orionis began to disappear.]
1997 June 02.43 UT: m1=2.0, DC=8 ... naked eye ... Andrew Pearce (Subiaco, Western Australia) [Magnitude estimate corrected for atmospheric extinction.]
1997 June 01.76 UT: m1=2.0 ,Dia = 20’ ,DC= 6/7, Tail= 0.5 deg. ... 7x50 B ... Willian Souza (São Paulo, Brasil)
1997 June 01.34 UT: ml=1.7, Dia.=~10', DC=8, Tail= 2 deg ... Naked Eye ... Terry Lovejoy(Thornlands, Brisbane, Australia) [Comet observed through my garage window with naked eye and 16-cm reflector! Rather light polluted yet comet still obvious without any optical aid. A very strongly curved tail.]
1997 June 01.33 UT: ml=2.0, DC=8, Dust Tail: 1 degree (dust) ... Naked Eye ... Zelko Karlovic (S37degrees 30min, E144degrees 38 minutes, 40 kilometres north west of Melbourne, Australia) [Dust tail short and broad and dropping off in brightNaked Eyess rapidly. Centre of coma still starlike through 7X50 binoculars. Comet and Alpha Orionis fit easily into oNaked Eye binocular field with tail measuring slightly more than 2 degrees. Picked up comet easily in Nautical twilight and was able to view it for 1 hour until it disaapppeared into cloud and haze Naked Eyear the horizon.]
1997 May  31.34 UT: m1=1.5, Dia.=~9', DC=9, Tail= 3 deg. ... 7x50 B ... Martin George (Launceston Planetarium, Tasmania, Australia) [Broad dust tail ~30' long visible to Naked Eye. In binoculars, the dust tail is spread out over ~140 deg. of PA with a sharp cutoff at tNaked Eye northern edge ... there is only just a hint of a gas tail.]
1997 May  31.29 UT: ml=1.7, Dia.=8.7', DC=9, Tail= 3.2 deg.(dust), 1.4 deg. (gas) ... 20-cm L (75X) ... Fábio and Fernanda Fernandes (Santos, Brazil) Exc ellent seing. In Naked Eye the tails 1.5 and 0.5 deg (dust, gas) (Extinction corrected using ICQ table]
1997 May  30.88 UT: m1=1.6, Dia=9', DC=8, Tail= 50' with naked eye ... 11x80 B ... Paulo M. Raymundo (Salvador, Brazil) [Extinction corrected]
1997 May  30.35 UT: m1=2.0, Dia=6', DC=8, Tail= 2 deg. ... Naked Eye & 7X50 B  ... Michael Mattiazzo (Adelaide, South Australia) [magnitude corrected for extinction]
1997 May  30.24 UT: m1=2.0:, Dia.=6', DC=9 ... 9x63 B ... H. Dahle (Manoa Valley, Oahu, HI) [Bright twilight, the comet was seen in a gap between low clouds. No suitable comparison stars available, although Alpha Orionis was visible in the same binocular field at exactly the same altitude as the comet (approximately 5 degrees). A rough magnitude estimate was thus obtaiNaked Eyed using mv=0.5 for Alpha Orionis, without any extinction correction. The tail was not visible.]
1997 May  29.90 UT: m1=1.6, Dia=20', DC=6 , Tail= 2 deg in PA 088(dust) ... Naked Eye ... Romualdo Lourencon (Itupeva, SP, Brazil ) [Estimate corrected for extinction]
1997 May  29.88 UT: m1=1.6, Dia=9', DC=8, Tail= 40' with naked eye ... 11x80 B ... Paulo M. Raymundo and Cristiane W. Cardoso (Salvador, Brazil) [Extinction corrected using ICQ summer table. What a pity that we see the comet fading so fast. The tail is not as conspicuous in the pictures as it was last week, eventhough it appears to be as bright to our eyes, filled with emotions and dreams. We have been observing this comet since Mar.ch 1996, we even went to RTMC in California to see it. It is hard to remember how nightlife was before it was discovered!]
1997 May  29.44 UT: m1=1.8, DC=8 ... Naked Eye ... Andrew Pearce (Woodlands, Western Australia) [Magnitude estimate corrected for atmospheric extinction.]
1997 May  28.44 UT: m1=1.8, Dia.=8', DC=8 ... Naked Eye ... Andrew Pearce (Woodlands, Western Australia) [Magnitude estimate corrected for atmospheric extinction. Similar mag estimate with 20x80B. Central condensation slightly 'softer' in appearance since last obs 3 weeks ago. Tail 2 deg long in PA 125 although tail starts out from coma at PA 130 before curving around to a final PA of approx 90 deg. I get the distinct impression that we are looking almost head on into the comet with the tail streaming out directly behind.]
1997 May  27.36 UT: m1=1.9, Dia=6', DC=8, Tail= 2 deg.  ... Naked Eye & 7X50B  ... Michael Mattiazzo (Adelaide, South Australia) [magnitude correction for extinction not required. The first 2 degrees of dust tail is bright but broadens rapidly into a faint fan.]
1997 May  27.34 UT: ml=1.3, Dia.=10', DC=9, Tail= 4 deg. ... Naked Eye ... Terry Lovejoy (Mt Cotton, Brisbane, Australia) [Comet seen over distant lights of brisbaNaked Eye, however comet is quite conspicious to naked eye with a hint of tail. Considerably brighter than gamma Orionis which is at slightly lower altitude]
1997 May  27.24 UT: m1=2.0, Dia.=8', DC=8, Tail= 0.8 deg. (dust)   ... 9x63 B ... H. Dahle (Manoa Valley, Oahu, HI) [Clear sky, but bright twilight and the comet was observed at an elevation of only about 7 degrees. The comparison star was Zeta Tauri. The comet was on the edge of naked eye visibility, but not visible with certainty without binoculars. m1 is extinction corrected (unless otherwise noted, this applies to all of my Hale-Bopp observations in May ).]
1997 May  26.35 UT: ml=1.3, Dia.=10', DC=9, Tail= trace ... Naked Eye ... Terry Lovejoy (Brisbane, Australia) [Comet seen from BrisbaNaked Eye suburbs whilst driving home along lit streets - even the tail is just visible to naked eye.]
1997 May  26.24 UT: m1=1.7, Dia.=9', DC=8, Tail= 0.4 deg. (dust) ... 9x63 B ... H. Dahle (Manoa Valley, Oahu, HI) [Observed in bright twilight at an elevation of about 8 degrees. The comparison stars were Beta Tauri and Zeta Tauri.]
1997 May  25.78-80 UT: comet not seen even from good site ... 6x30 B ... Vladimir Dinets (Dmitrov Hills, N from Moscow, Russia)
1997 May  25.36 UT: m1=1.8, Dia.=8', DC 8 ... 20x80 B ... Paul Camilleri (Cobram, Victoria, Ausrtalia)
1997 May  25.34 UT: ml=1.3, Dia.=10', DC=9, Tail= 5 degrees ... Naked Eye ... Terry Lovejoy (Redland Bay, Brisbane, Australia) [Comet suprisingly conspicious naked eye, although tail Naked Eyeeds binoculars to be seen clearly. In 10 x 50 binoculars get the distinct impression of looking down the shaft of the tail.]
1997 May  25.34 UT: ml=1.9, DC=8, Dia=9', Tail= 40' ... 20-cm SCT (77x) ... Albert Brakel (Canberra, Australia) [Easily seen with unaided eye, even before twilight ended. South side of pseudonucleus still active, sending out a lateral fan with subtle radial structure, that is then swept back to form the bright south side of the tail. S tail edge not as sharply defiNaked Eyed as 2 weeks ago, and the rest of the tail quite dim. Magnitude estimated by direct comparison with Bellatrix, which was almost at the same elevation.]
1997 May  23.35 UT: m1=1.6, Dia.=6', DC=8, Tail= 2deg(dust) ... 7X50 B ... Michael Mattiazzo (Adelaide, South Australia) [Magnitude corrected for extinction. In a 20-cm reflector, an intense pseudonucleus spanning about 4" is visible. A bright fan eminates from the nucleus at about p.a. 180 deg for 4' before rapidly rotating toward p.a. 100 deg. A faint hood is visible north of the nucleus.The first degree of tail is very bright and the southern side is more promiNaked Eyent.The nucleus is very offset from the coma creating a most unusual looking comet. Observation made in light polluted conditions but moonless.]
1997 May  22.25 UT: m1=1.4, Dia.=10', DC=8, Tail= 1.5 deg. (dust) ... Naked Eye ... H. Dahle (Manoa Valley, Oahu, HI) [The comet was still clearly visible to the naked eye as a fuzzy patch, but the tail was not visible without binoculars. The southern part of the coma and tail appears strikingly brighter than the northern part. Twilight and low altitude (about 8 degrees). Beta Tauri and Zeta Tauri were used as comparison stars.]
1997 May  21.81 UT: m1=2.0: , Dia.=7', DC=6 ... 20x60 B ... Tomasz Sciezor (Krakow, Poland) [Excellent conditions, the sky clear to the horizon. Comet only ~1.5deg. above horizon in rather bright twilight, visible as faint, fuzzy brightening without any traces of the tail, only in 20x60B. I have always thought, that it is impossible to observe a comet at such low elevation and in such bright twilight, but this comet  ...  Magnitude very uncertain, has been corrected for extinction.]
1997 May  21.77 UT: m1=2.0, DC=8, Tail= not visible ... 6x30 B ... Vladimir Dinets (Moscow, Russia)
1997 May  20.89 UT: m1=1.3, Dia.=8', DC=8, Tail= 40'... Naked Eye & 11x80 B ... Paulo M. Raymundo (Salvador, Brazil) [Estimate corrected for extinction. Observation made from a street downtown, people stopped to see the Comet too. NoNaked Eye of them had seen a comet before, most thought that Comet Hale-Bopp could only be seen on April 1st]
1997 May  20.76 UT: m1=1.5, Dia.= 10’ ,DC=8, Tail= 0.5 deg. ... 7X50 B ... Willian Souza (São Paulo, SP, Brasil)
1997 May  20.25 UT: m1=1.1, Dia.=10', DC=9, Tail= 1 deg. (dust) ... Naked Eye ... H. Dahle (Manoa Valley, Oahu, HI) [Clear, but moonlight and twilight. Beta Tauri was used as comparison star.]
1997 May  19.89 UT: m1=1.3, Dia.=8', DC=8, Tail= 1 deg. with naked eye ... 11x80 B ... Paulo M. Raymundo (Salvador, Brazil) [Extinction corrected. Moonlight interfering less than I expected]
1997 May  19.80 UT: m1=1.2, Dia.=10', DC=7, Dust Tail= ~5 deg., ions Tail not visible ... Naked Eye ... Toni Scarmato (Calabria, Italy)
1997 May  19.79 UT: m1=1.5, Dia.=10’ DC=8 ... 7X50 B ... Willian Souza (São Paulo, Brazil)
1997 May  19.36 UT: m1=1.1, Dia.=10', DC 8 ... 20x80 B ... Paul Camilleri (Cobram, Victoria, Australia)
1997 May  19.33 UT: ml=1.3, Dia.=10', DC=9, Tail= 3 degrees dust ... 10x50B  ... Terry Lovejoy (Thornlands, Brisbane, Australia) [Despite strong moonlight, low altitude, car headlights, street lights, etc. comet is visible naked eye on way home from work! A heavily curved tail is visible in binoculars.]
1997 May  19.25 UT: m1=1.1, Dia.=11', DC=8, Tail= 2 deg. (dust) ... Naked Eye ... H. Dahle (Manoa Valley, Oahu, HI, USA) [Twilight and moonlight, but completely clear. The naked eye tail was very faint. Beta Tauri was used as comparison star.]
1997 May  19.17 UT: ml=1.2, Dia.=~7', DC=8, Tail= 2 deg.(gas & dust) ... 12x50 B ... Carmelita Miranda (Mt. Abel, CA, USA)
1997 May  19.16 UT: ml=1.3, DC=9 ... 10x50 B ... Charles Morris (Mt. Abel, CA, USA) [No extinction correction Naked Eyeed. Betelgeuse was almost exactly at the same elevation. how often can you say that for a bright comet that is less than 6 degrees off the horizon! Comet barely visible to the naked eye due to moon, elevation, and twilight. The m1 estimate is probably a bit underestimated due to twilight and the Moon. The comet was tiny in the 25-cm L (45-156x). A hint of Naked Eye hood. Mahalo to Carmelita Miranda for dragging me up to the mountains for a final view of the comet (while it is bright). It was a unique night in many respects the comet, Venus at an extremely low elevation, and a search for C/1997 H2 (SOHO). I am both sorry to see the comet go and relieved; no comet since 1P/Halley in 1985-86 has so controlled my life for so long; it is nice to have my life back!]
1997 May  18.36 UT: m1=1.0, Dia.=10', DC=9 ... 20x80 B ... Paul Camilleri (Cobram, Victoria, Australia)

C/1997 D1 (Mueller)
1997 June 01.24 UT: m1=13.5:, Dia.= 1.0', DC=3 ... 51-cm L (120x) ... Charles S. Morris (Lockwood Valley, CA) [Very poor seeing, no extinction applied yet  ... probably is a bit brighter.]
1997 May  09.92 UT: m1=13.3, Dia.=1', DC=2-3 ... 25.4-cm L (104x) ... Maik Meyer (Frauenstein, Germany)
1997 Apr. 05.04 UT: m1=13.5:, Dia.=0.4', DC=5 ... 44-cm L (100x) ... Timo Karhula (Virsbo, Sweden) [Naked Eyear the galaxy MCG+9-16-59]
1997 Apr. 02.92 UT: m1=13.4, Dia.=1', DC=3 ... 25.4-cm L (104x) ... Maik Meyer (Frauenstein, Germany)
1997 Mar. 28.91 UT: m1=13.6, Dia.=1', DC=0 ... 44.5-cm L (167x) ... J. Carvajal (Teruel, Spain) [difficult and very diffuse, at the limit of the instrument]
1997 Mar. 14.92 UT: m1=14.1, Dia.=0.7', DC=6 ... 44-cm L (100x) ... Timo Karhula (Virsbo, Sweden) [First quarter moon interfered.]
1997 Mar. 10.98 UT: m1=13.3, Dia.=0.7', DC=3-4 ... 25.4-cm L (104x) ... Maik Meyer (Frauenstein, Germany)
1997 Mar. 09.29 UT: m1=13.4, Dia.=1', DC=3 ... 32.75-cm L (195x) ... Tom Johnston(Boulder,CO) [Slightly condensed core]
1997 Mar. 09.26 UT: m1=13.7, Dia.= 0.8', DC=3 ... 51-cm L (185x) ... Charles S. Morris (Lockwood Valley, CA)
1997 Mar. 08.95 UT: m1=13.9, Dia.=0.75', DC=3D1 ... 44.5-cm L (100x) ... J. Carvajal (Teruel, Spain)
1997 Mar. 08.93 UT: m1=14.2, Dia.=0.4', DC=7 ... 44-cm L (100x) ... Timo Karhula (Virsbo, Sweden) [A very small comet with a relatively swift motion]
1997 Mar. 08.81 UT: m1=14.3, Dia.=1.1', DC=3 ... 44-cm L (100x) ... Werner Hasubick (Buchloe, Germany)
1997 Mar. 04.94 UT: m1=13.3, Dia.=0.5', DC=4-5 ... 25.4-cm L (104x) ... Maik Meyer (Frauenstein, Germany) [Comet quite condensed.]
1997 Mar. 04.27 UT: m1=13.4, Dia.=~1', DC=~4 ... 41-cm L ... Alan Hale (Cloudcroft, NM) [motion obvious within a few minutes]
1997 Mar. 03.29 UT: m1=12.5 CCD, Dia.=1', DC=3 ... C8 f6.3 ST6 2min ... Tom Johnston (Sommers-Bausch Observatory, Boulder, CO) [CCD image showed the presence of a slight tail)

C/1997 H2 (SOHO)
1997 May  19.18 UT: ml=[9.0-9.5 ... 26-cm L (105x) ... Charles Morris (Mt. Abel, CA) [Searched for about a degree around the predicted position of this comet. Probably could see down to mv=11.0 stellar. Lots of "fuzzy" spots  ... all turNaked Eyed out to be faint stars. Fainter than estimate based on a Naked Eyearby AAVSO field and assuming that the comet was diffuse.]
1997 May  11.34 UT: ml=[6.5 ... 7.0-cm R ... Terry Lovejoy (Australia) [Comet not seen seen]

C/1997 J1 (Mueller)
1997 June 07.92 UT: m1=12.7, Dia.=0.9', DC=3 ... 25.4-cm L (104x) ... Maik Meyer (Frauenstein, Germany)
1997 June 01.26 UT: m1=12.8, Dia.=1.1', DC=5 ... 51-cm L (120x) ... Charles S. Morris (Lockwood Valley, CA) [Very poor seeing. Small and condensed]
1997 June 01.20 UT: m1=12.8, Dia.=1.5', DC=2 ... 32.75-cm L ... Tom Johnston (Gold Hill,CO)
1997 May  28.11 UT: m1=12.5, Dia.=~0.8', DC=5 ... 41-cm L (114x) ... J. Bortle (Stormville, NY) [Small, faint, moderately condensed coma. With 170x there seems to be a tiny, dense knot of material at the coma's center.]
1997 May  10.94 UT: m1=12.2, Dia.=1.5', DC=3 ... 25.4-cm L (65x) ... Maik Meyer (Frauenstein, Germany)
1997 May  09.90 UT: m1=12.1, Dia.=1.5', DC=4 ... 25.4-cm L (65x) ... Maik Meyer (Frauenstein, Germany)
1997 May  07.92 UT: m1=12.9, Dia.=0.8', DC=3 ... 25.4-cm L (104x) ... Maik Meyer (Frauenstein, Germany) [Motion obvious within minutes. Comet Naked Eyear 10th mag star, so the diameter is May be an underestimation.]
1997 May  06.16 UT: m1=12.5, Dia.=1.5', DC=4 ... 38-cm L (x143) ... Bob King (Duluth, MN) [Moderately condensed with faint stellar nucleus. Motion to southwest easily seen within half hour.]

C/1997 J2 (Meunier-Dupouy)
1997 June 10.13 UT: m1=12.4, Dia.=1.2', DC=5 ... 41-cmL (114x) ... J. Bortle (Stormville, NY) [Small, circular, faint object with glimpses of a tiny, rather strong central knot. Moonlight.]
1997 June 07.93 UT: m1=12.4, Dia.=1', DC=4 ... 25.4-cm L (104x) ... Maik Meyer (Frauenstein, Germany)
1997 June 05.29 UT: m1=12.2, Dia.=1.1', DC=5  ... 41-cm L (116x) ... Fábio and Fernanda Fernandes (Santos, Southeast Brazil) [Observation from Fortaleza, Northeast Brazil. Magnitude corrected for extinction.]
1997 June 01.31 UT: m1=12.1, Dia.=1.0', DC=5 ... 51-cm L (120x) ... Charles S. Morris (Lockwood Valley, CA) [Very poor seeing. Much more obvious than 97 J1]
1997 June 01.22 UT: m1=12.3, Dia.=1.5', DC=4 ... 32.7-cm L ... Tom Johnston (Gold Hill, CO) [Slightly condensed core]
1997 May  10.94 UT: m1=12.7, Dia.=1', DC=3 ... 25.4-cm L (104x) ... Maik Meyer (Frauenstein, Germany)
1997 May  09.91 UT: m1=12.6, Dia.=0.9', DC=3-4 ... 25.4-cm L (104x) ... Maik Meyer (Frauenstein, Germany)

C/1997 L1 (Xinglong)
1997 June 15.30 UT m1=16.7 CCD, Dia=0.5', DC=2 ... ST6/C8@3min ... Tom Johnston (Sommers-Bausch Observatory) [Conditions better than first observation. Would be difficult target visually.]
1997 June 11.31 UT m1=16.8 CCD, Dia=0.5', DC=2 ... ST6/C8@2min ... Tom Johnston (Sommers-Bausch Observatory) [Almost stellar,very faint]

2P/Encke
1997 June 27.36 UT: m1=8.2, Dia.=~7', DC=1 ... 15-cm L (43x) ...  Colin Drescher (Warrill View, Queensland, Australia) [I agree with the observations of Andrew Pearce. Large diffuse coma of low surface brightness with slight central condensation . Comet moved about 4' in a period of 30 minutes. It is currently moving over 3. 5 degrees per day, at an increasing rate.]
1997 June 26.46 UT: m1=7.8, Dia.=5', DC=1 ... 20x80 B ... Andrew Pearce (City Beach, Western Australia) [Magnitude estimate with 20-cm refl gives m1=7.9, Dia.=4.5', DC=1. Distinct fade in brightness over the last 3 days. Very difficult to see in 20x80B whereas 3 days ago it was relatively easy. Vague diffuse coma of low surface brightness]
1997 June 25.45 UT: m1=7.5, Dia.=6.5', DC=1 ... 20x80 B ... Andrew Pearce (City Beach, Western Australia) [Magnitude estimate with 20-cm refl gives m1=7.6, Dia.=5', DC=1.5. Slightly murky sky conditions. Extensive outer coma visible which is very diffuse and vague.]
1997 June 23.45 UT: m1=7.3, Dia.=6.5', DC=2 ... 20x80 B ... Andrew Pearce (City Beach, Western Australia) [Magnitude estimate with 20-cm refl gives m1=7.4, Dia.=4.8', DC=2. Excellent conditions, this probably being the first observation made in a truly dark sky. Extensive outer coma visible and a slight brightening at the centre of the coma. Hints that the coma May  be significantly larger if observed at a higher altitude. Easily visible in 20x80B for the first time.]
1997 June 21.44 UT: m1=7.4, Dia.=3.5', DC=1 ... 20-cm L (45x) ... Andrew Pearce (City Beach, Western Australia) [Coma diffuse and ill-defined with very low surface brightness which made it fairly difficult to see against the sky background. Observation made with moon still less than 5 deg above eastern horizon.]
1997 June 16.44 UT: m1=7.3, Dia.=3.3', DC=2 ... 20-cm L (45x) ... Andrew Pearce (City Beach, Western Australia) [Coma quite diffuse and ill-defined which made it fairly difficult to see against the sky background which is starting to suffer adversely from moonlight.]
1997 June 15.44 UT: m1=7.3, Dia.=3', DC=2 ... 20-cm L (45x) ... Andrew Pearce (City Beach, Western Australia) [Coma quite small and diffuse with no hint of a central condensation.]
1997 June 14.44 UT: m1=7.1, Dia.=2.8', DC=3 ... 20-cm L (45x) ... Andrew Pearce (City Beach, Western Australia) [Comparison star used is listed as mag 7.3 in AAVSO Atlas which is the basis of the magnitude estimate. However star's magnitude in GSC is 7.0. Star position RA 6h30m30s Dec 4deg19'54"]
1997 June 09.43 UT: m1=6.5, Dia.=2.5', DC=3 ... 20-cm L (45x) ... Andrew Pearce (City Beach, Western Australia)[Difficult observation with comet only 4 deg above local horizon. Magnitude corrected for atmospheric extinction]
1997 June 08.34 UT: m1=6.9, Dia.=2', DC=3,  ... 15-cm L (43x) ... Colin Drescher (Mar.oon, Queensland, Australia) [Excellent conditions. Comet observed for 15 minutes. Slight elongation of coma seen. Previous magnitude estimates were affected by extreme low altitude. Comet is not 5.7 - 6.0 magnitude (yet!). I have seen 2P/Encke on 5 different evenings. Wednesday 4 Jun. - Observation interrupted by small clouds. Thursday 5 Jun. - Bad site! Observation stopped by inquisitive locals with car headlights pointed at me. Then they went home to phoNaked Eye the police. The boys in blue arrived as I was about to leave. After the interrogation the annoyed observer was allowed to leave.]
1997 June 07.90 UT: m1=[6.0 ... 11x80 B ... Jose Guilherme de S. Aguiar (Campinas, Brazil) [Comet not seen. Stellar magnitude limit: 6.5-6.7]
1997 June 03.43 UT: m1=[5.0 ... 20x80 B ... Andrew Pearce (City Beach, Western Australia) [First attempt at this apparition. Only a brief period was available for observation prior to some big rain clouds rapidly moving in from the ocean. Consequently the observation was made in twilight. Stars to mag 6.5 were seen in the vicinity of the comet's location. I'm confident of observing the comet in the Naked Eyext few days if it is around 6th mag. This will be the fourth return I've followed the comet.]
1997 June 02.35 UT: m1=~6.0, Dia.=--, DC=2 ... 15-cm L (43x) ... Colin Drescher (Warrill View, Queensland, Australia) [Magnitude estimate uncertain. Comet seen for 4 minutes. Observation affected by end of twilight and patchy clouds.]
1997 June 01.34 UT: m1=~5.7, Dia.=2', DC=2 ... 15-cm L (43x) ... Colin Drescher (Warrill View, Queensland, Australia ~27.5 deg S) [Observation difficult, 3 deg. above horizon. Bright Hale-Bopp 3 degrees higher and 8 degrees away.]

29P/Schwassmann-Wachmann 1
1997 June 03.19 UT: m1=12.7, Dia.=1.5', DC=4 ... 41-cm L ... Alan Hale (Cloudcroft, NM) [distinctly brighter and more condensed than a month ago. At 183x there is even some suggestion of a condensation]
1997 May  01.95 UT: m1=13.1, Dia.=1.5', DC=2 ... 44.5-cm L (100x) ... J. Carvajal (Teruel, Spain) [brighter and more condensed than last month]
1997 May  01.95 UT: m1=13.8, Dia.=1', DC=2 ... 44.5-cm L (100x) ... J. M. San Juan (Teruel, Spain)
1997 Apr. 06.04 UT: m1=14.6 CCD, Dia.=1.0', DC=2 ... 20-cm SCT ... Alain Klotz (Castres, France) [CCD. Calibrated with GSC stars]
1997 Mar. 28.93 UT: m1=14.2, Dia.=<1', DC=0/ ... 44.5-cm L (100x) ... J. Carvajal (Teruel, Spain) [very small but well defined, easier than C/1997 D1]
1997 Feb. 16.18 UT: m1=14.1, Dia.=1.5', DC=0/ ... 44.5-cm L (100x) ... J. Carvajal (Teruel, Spain)
1997 Feb. 16.16 UT: m1=15.0 CCD, Dia.=1.3', DC=3 ... 20-cm SCT ... Alain Klotz (Castres, France) [CCD. Calibrated with GSC stars]
1997 Feb. 08.07 UT: m1=15.0 CCD, Dia.=1.8', DC=2 ... 20-cm SCT ... Alain Klotz (Castres, France) [CCD. streamer toward PA=290 (15 arcsec lengh). Calibrated with GSC stars]
1997 Jan. 12.14 UT: m1=16.4 CCD, Dia.=0.7', DC=2 ... 20-cm SCT ... Alain Klotz (Castres, France) [CCD]

46P/Wirtanen
1997 June 01.19 UT: m1=12.0, Dia.= 1.8', DC=1 ... 51-cm L (120x) ... Charles S. Morris (Lockwood Valley, CA) [Very poor seeing, no extinction applied yet, final estimate will be a few tenths brighter.]
1997 May  07.87 UT: m1=10.4, Dia.=1.5', DC=2-3 ... 25.4-cm L (65x) ... Maik Meyer (Frauenstein, Germany)
1997 May  01.91 UT: m1=10.1, Dia.=2', DC=1 ... 44.5-cm L (74x) ... J. Carvajal (Teruel, Spain)
1997 May  01.91 UT: m1=10.4, Dia.=2', DC=2 ... 44.5-cm L (100x) ... J. M. San Juan (Teruel, Spain)
1997 Apr. 10.06 UT: m1=9.8, Dia.=2.1', DC=0-1 ... 41--cm L (70x) ... J. Bortle (Stormville, NY) [Faint, diffuse, circular coma.]
1997 Apr. 09.18 UT: ml=9.8, Dia.=2.9', DC=2 ... 26-cm L (67x) ... Charles Morris (Whitaker Peak, CA)
1997 Apr. 08.06 UT: m1=9.8, Dia.=~1.7', DC=1 ... 41-cm L (70x) ... J. Bortle (Stormville, NY) [Very faint diffuse object. With 114x central region appears more dense than at lower power.]
1997 Apr. 05.89 UT: m1=9.6, Dia.=3', DC=4  ...  25.4-cm L (93x) ... Bjørn H. Granslo (Hågår Observatory, near Eina, Norway) [Its appearance resembled 81P/Wild 2. The m1 reference was AAVSO T Tau. Also faintly seen in 7.5-cm R (48x). NLM=5.5.]
1997 Apr. 05.85 UT: m1=9.6, Dia.=>3', DC=4 ... 21.0-cm L (60x) ... J. Carvajal (Castellon, Spain)
1997 Apr. 04.84 UT: m1=10.3, Dia.=1.4', DC=2 ... 44 -cm L (100x) ... Timo Karhula (Virsbo, Sweden) [A diffuse comet near M45]
1997 Apr. 02.81 UT: m1=9.9, Dia.=2.5', DC=2-3 ... 25.4-cm L (65x) ... Maik Meyer (Frauenstein, Germany)

81P/Wild 2
1997 June 23.25 UT: m1=10.8, Dia.=2', DC=4 ... 45-cm CASS ... Tom Johnston (Sommers-Bausch Observatory) [Central condensation evident]
1997 June 09.10 UT: m1=10.7, Dia.=1.9', DC=3 ... 41-cm L (70x) ... J. Bortle (Stormville, NY) [Magnitude corrected for extinction. Coma seen to be rather more condensed at 114x, with a tiny central knot of bright material.)
1997 June 07.91 UT: m1=10.7, Dia.=2', DC=3-4 ... 25.4-cm L (65x) ... Maik Meyer (Frauenstein, Germany)
1997 June 01.24 UT: m1=10.8, Dia.=4.6', DC=4 ... 51-cm L (78x) ... Charles S. Morris (Lockwood Valley, CA) [Condensed central region surrounded by a very diffuse and faint coma.]
1997 May  28.10 UT: m1=10.7, Dia.=1.9', DC=4 ... 41-cm L (70x) ... J. Bortle (Stormville, NY) [Magnitude corrected for extinction.]
1997 May  27.12 UT: m1=10.6, Dia.=1.7', DC=5 ... 41-cm L (70x) ... J. Bortle (Stormville, NY). [Magnitude corrected for extinction. Coma continues to display a tiny central knot.]
1997 May  09.87 UT: m1=10.8, Dia.=1.5' ... 13-cm R (70x) ... Wolfgang Vollmann (Payerbach, Austria)
1997 May  08.10 UT: m1=10.1, Dia.=2.3', DC=5 ... 41-cm L (70x) ... .J.Bortle (Stormville, NY) [Magnitude corrected for extinction. Moderately condensed, roughly circular coma which, at high magnification, contains a minute nucleus of 13.5-14.0mg.]
1997 May  07.88 UT: m1=10.4, Dia.=2', DC=3-4 ... 25.4-cm L (65x) ... Maik Meyer (Frauenstein, Germany)
1997 May  05.10 UT: m1=10.2, Dia.=1.8', DC=5 ... 41-cm L (70x) ... J. Bortle (Stormville, NY) [Magnitude corrected for extinction. Small, roughly circular, moderately condensed coma containing a minute nucleus of ~13.7 magnitude.]
1997 May  03.88 UT: m1=10.0, Dia.=2', DC=5 ... 13-cm R (35x) ... Wolfgang Vollmann (Payerbach, Austria) [in front of a 12mag star which is clearly visible through the coma]
1997 May  01.92 UT: m1=9.9, Dia.=3', DC=5 ... 44.5-cm L (74x) ... J. Carvajal (Teruel, Spain)
1997 May  01.92 UT: m1=9.7, Dia.=3.5', DC=4 ... 44.5-cm L (74x) ... J. M. San Juan (Teruel, Spain)
1997 Apr. 27.13 UT: m1=10.2, Dia.=2.0', DC=6 ... 41-cm L ... J. Bortle (W.R.Brooks Observatory, Stormville, NY) [Coma slightly elongated PA 095-275 with tiny, Naked Eyear-stellar nucleus of 13.5-14.0 offset somewhat toward the west.]
1997 Apr. 26.92 UT: m1=9.9, Dia.=2.2', DC=3-4 ... 25.4-cm f/6 L (93x) ... Bjørn, H. Granslo (Hågår Observatory, near Eina, Norway) [Some interference from high clouds (NLM=5.0). Sequence AAVSO U Gem. Roar Skartlien and I also made prime focus CCD images of this comet and C/1995 O1 during the previous night.]
1997 Apr. 12.48 UT: m1=10.3, Dia.=2.5', DC=5 ... 20-cm L (44x) ... M Mattiazzo (Adelaide,South Australia) [Hint of a tail toward p.a. 100deg, 5 day old moon present]
1997 Apr. 11.22 UT: ml=9.7, Dia.=4.4', DC=4 ... 26-cm L (45x) ... Charles Morris (Whitaker Peak, CA) [The comet has a condensed center with an extremely faint outer coma. There is a very faint stellar(?) nucleus and a short tail towards PA 110 deg.]
1997 Apr. 10.09 UT: m1=9.8, Dia.=2.3', DC=6-7 ... 41-cm L (70x) ... J. Bortle (Stormville, NY) [Rather strongly condensed, slightly elongated coma, containing a stellar or near-stellar nucleus of 13.7 mag. Traces of a short, broad tail toward p.a. 110 deg.]
1997 Apr. 09.21 UT: ml=9.7, Dia.=4.4', DC=3 ... 26-cm L (45x) ... Charles Morris (Whitaker Peak, CA) [The comet has a condensed center with an extremely faint outer coma. There is a very faint stellar(?) nucleus and hint of a short tail towards the east.]
1997 Apr. 08.84 UT: m1=9.8, Dia.=2', DC=5 ... 13-cm R (35x) ... Wolfgang Vollmann (Payerbach, Austria)
1997 Apr. 08.10 UT: m1=9.8, Dia.=2.1', DC=6-7 ... 41-cm L (70x) ... J. Bortle (Stormville, NY) [Well condensed coma with area of greatest condensation offset somewhat toward p.a. 267. Suspect a short, vague tail in p.a. 087.]
1997 Apr. 07.13 UT: m1=9.6, Dia.=3, DC=4 ... 25-cm L (76x) ... Bill Matthews (Poplar Bluff, MO) [Comet is a faint, but easy object. There is a tiny faint central condensation, just off center, of the (uniformly bright) smudge that is the coma.]
1997 Apr. 05.86 UT: m1=9.9, Dia.=1.5', DC=6 ... 21.0-cm L (60x) ... J. Carvajal (Castellon, Spain) [still possible >2' tail in PA. 95 deg.]
1997 Apr. 05.14 UT: m1=9.9, Dia.=2.2', DC=6-7 ... 41-cm L (70x) ... J. Bortle (Stormville, NY) [At 114x an essentially star-like nucleus of ~13.5 mag.]
1997 Apr. 04.88 UT: m1=10.1, Dia.=2.0', DC=5 ... 44-cm L (100x) ... Timo Karhula (Virsbo, Sweden) [Elongated coma]
1997 Apr. 03.86 UT: m1=10.3, Dia=1'30", DC=6 ... 15-cm R f/8 ... A. Diepvens (Balen, Belgium)
1997 Apr. 02.87 UT: m1=10.3, Dia.=1.8', DC=5 ... 13-cm R (35x) ... Wolfgang Vollmann (Payerbach, Austria)
1997 Apr. 02.82 UT: m1=9.5, Dia.=3', DC=4 ... 25.4-cm L (65x) ... Maik Meyer (Frauenstein, Germany)

118P/Shoemaker-Levy 4
1997 Mar. 10.81 UT: m1=13.3, Dia.=0.8', DC=2 ... 25.4-cm L (104x) ... Maik Meyer (Frauenstein, Germany)
1997 Mar. 09.18 UT: m1=13.5, Dia.=0.7', DC=1/ ... 51-cm L (185x) ... Charles S. Morris (Lockwood Valley, CA)
1997 Mar. 08.83 UT: m1=13.7, Dia.=0.3', DC=3 ... 44 -cm L (156x) ... Werner Hasubick (Buchloe, Germany)
1997 Mar. 01.83 UT: m1=13.1:, Dia.=1.1', DC=1 ... 25.4-cm L (104x) ... Maik Meyer (Frauenstein, Germany)
1997 Feb. 08.89 UT: m1=12.7, Dia.=2', DC=1 ... 44.5-cm L (100x) ... J. M. San Juan (Madrid, Spain)
1997 Feb. 08.89 UT: m1=12.5, Dia.=1', DC=2 ... 44.5-cm L (100x) ... J. Carvajal (Madrid, Spain)
1997 Feb. 05.86 UT: m1=13.0, Dia.=1.5', DC=5 ... 26-cm L (84x) ... Nicolas Biver (Versailles, France) [Observed 50km south of Paris]
1997 Feb. 03.42 UT: m1=12.8, Dia.=1', DC=3 ... 20.3 L (56x) ... Paul Camilleri (Cobram Victoria, Australia)
1997 Feb. 01.78 UT: m1=12.9, Dia.=1.0', DC=2-3 ... 25.4-cm L (104x) ... Maik Meyer (Frauenstein, Germany)
1997 Jan. 28.50 UT: m1=12.6, Dia.=1', DC=3 ... 20.3-cm L (56x) ... Paul Camilleri (Cobram Victoria Australia)
1997 Jan. 26.76 UT: m1=12.8, Dia.=0.8', DC=3 ... 25.4-cm L (65x) ... Maik Meyer (Frauenstein, Germany)
1997 Jan. 14.85 UT: m1=12.9, Dia.=0.2', DC=4 ... 44-cm L (100x) ... Werner Hasubick (Buchloe, Germany)
1997 Jan. 13.52 UT: m1=12.5, Dia.=1.5', DC=3 ... 20.3-cm L (56x) ... Paul Camilleri (Cobram Victoria Australia) [Comet was diffuse and of low surface brightness]
1997 Jan. 12.86 UT: m1=12.8, Dia.=1.1', DC=2-3 ... 25.4-cm L (104x) ... Maik Meyer (Frauenstein, Germany)
1997 Jan. 12.50 UT: m1=12.5, Dia.=1.5', DC=2 ... 20.3-cm L (56x) ... Paul Camilleri (Cobram Victoria Australia)
1997 Jan. 06.84 UT: m1=12.4, Dia.=1.2', DC 3-4 ... 25.4-cm L (104x) ... Maik Meyer (Frauenstein, Germany)
1997 Jan. 05.92 UT: m1=12.7, Dia.=0.8', DC=5 ... 44-cm L (100x) ... Timo Karhula (Virsbo, Sweden)
1997 Jan. 05.22 UT: m1=12.7, Dia.=1.5', DC=4 ... 32.7-cm L ... Tom Johnston (Boulder, CO, USA)
1997 Jan. 03.54 UT: m1=12.7, Dia.=1.3', DC=3 ... 20-cm L ... Andrew Pearce (Woodend, Victoria, Australia)
1997 Jan. 03.19 UT: m1=12.4, Dia.=~1' ... 41-cm L ... Alan Hale (Cloudcroft, NM) [the comet was quite close to an ~11th magnitude star, and this May have affected the brightness measurement somewhat]

121P/Shoemaker-Holt 2
1997 Mar. 14.95 UT: m1=14.4, Dia.=1.1',DC=3 ... 44 -cm L (100x) ... Timo Karhula (Virsbo, Sweden) [First quarter moon interfered.] 
1997 Mar. 09.22 UT: m1=13.8, Dia.=0.8', DC=1/ ... 51-cm L (185x) ... Charles S. Morris (Lockwood Valley, CA)
1997 Mar. 08.94 UT: m1=14.3, Dia.=1', DC=0 ... 44.5-cm L (100x) ... J. Carvajal (Teruel, Spain)
1997 Mar. 08.87 UT: m1=14.5, Dia.=0.9', DC=3 ... 44 -cm L (100x) ... Timo Karhula (Virsbo, Sweden) [A difficult object. Fainter than 15.3mp galaxy IC 2577]
1997 Mar. 08.83 UT: m1=14.1, Dia.=0.6', DC=3 ... 44 -cm L (156x) ... Werner Hasubick (Buchloe, Germany)
1997 Mar. 04.85 UT: m1=13.7, Dia.=0.3', DC=5 ... 44 -cm L (156x) ... Werner Hasubick (Buchloe, Germany)
1997 Feb. 08.96 UT: m1=13.9, Dia.=0.5', DC=0 ... 44.5-cm L (100x) ... J. Carvajal (Madrid, Spain)
1997 Jan. 09.40 UT: m1=13.6, Dia.=~1.5', DC=~2 ... 41-cm L ... Alan Hale (Cloudcroft, NM) [very faint, vague, and diffuse]
1997 Jan. 03.41 UT: m1=13.5 ... 41-cm L ... Alan Hale (Cloudcroft, NM) [very faint and diffuse, the comet was not confirmed until re-observed on January 9 (the Naked Eyext clear night!)]

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