38P/Stephan-Oterma

38P/Stephan-Oterma
Reported observations:
2018 Aug. 15.76 UT: m1=13.1, Dia.=1.6’, DC=2/, ... 25-cm L f:5(83x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Aug. 15.17 UT: m1=10.9, Dia.=3', DC=2/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [Motion followed for a 75-min period. Astronomical twilight. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2018 Aug. 12.05 UT: m1=13.5, Dia.=0.6', DC=0, ... 0.60-m f/4 L(244x, 305x) ... Gabor Santa (Tarján, Hungary) [coma is more diffuse in PA=240, but no tail visible, h=22 deg.]
2018 Aug. 10.17 UT: m1=11.5, Dia.=2.5', DC=3, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [Brighter than expected. Astronomical twilight. Sidgwick method. Tycho-2 comparison stars. SQM: 20.5]
2018 Aug. 08.76 UT: m1=14.1, Dia.=1.2’, DC=3, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult; diffuse coma, slightly brighter in centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
Advertisements