* * * * * 53P/van Biesbroeck * * * * *

Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2016 10 25.42 S 14.4 AQ 25.0L 83 0.6 1 WYA Walcha, NSW (Coma getting very difficult to see. Diffuse round patch. Close to 14th magnitude star.) 2016 10 24.42 S 14.3 AQ 25.0L 83 0.9 1 WYA Walcha, NSW (Coma very diffuse, slight hint of central brightening.) 2016 10 23.42 S 14.3 AQ 25.0L 83 1 1 WYA Walcha, NSW (Very diffuse coma, weakly condensed.) 2016 10 4.819 S 14.7 AQ 30.5T 179 0.4 4 DIJ Burlage 2016 10 4.816 S 14.2:AQ 30.5T 179 0.6 2 BOU Burlage, Germany 2016 9 28.43 S 14.0 AQ 25.0L 83 1 2 WYA Walcha, NSW (Coma small and diffuse. Sky slightly hazy from smoke.) 2016 9 27.51 S 13.5 AQ 40.6L 165 0.8 3 CAM Warners Bay, NSW 2016 9 26.42 S 13.5 AQ 25.0L 83 1 3 WYA Walcha, NSW (Coma very diffuse and difficult.) 2016 9 7.886 S 14.3 AQ 30.5T 139 0.5 2/ DIJ Burlage 2016 9 7.883 S 13.8 AQ 30.5T 139 0.7 3 BOU Burlage, Germany 2016 9 1.51 S 14.0 AU 40.0L 257 0.6 2 YOS Kita-karuizawa, Gunma (Near limit.) 2016 8 30.899 S 13.6 AQ 30.5T 139 0.7 4 BOU Burlage, Germany 2016 8 30.897 S 13.5 AQ 30.5T 139 0.7 4/ DIJ Burlage 2016 8 27.41 S 13.5 AQ 40.6L 165 0.6 3 CAM Warners Bay, NSW 2016 8 12.984 S 13.5 AQ 30.5T 139 1.0 3 DIJ Burlage 2016 8 12.981 S 13.5 AQ 30.5T 139 0.8 4 BOU Burlage, Germany 2016 8 12.72 M 13.3 AQ 25.0L 83 1.4 6 WYA Walcha, NSW (Easily visible, coma diffuse with small faint stellar central condensation, opaque inner coma.) 2016 8 8.53 M 13.4 AQ 25.0L 83 1.4 6 WYA Walcha, NSW (Coma diffuse, brightens to an opaque inner coma with a faint stellar central condensation, m2 = 14.8 approximately. Does not enhance in Swan Band filter. No tail visible. Coma visible at 39x but best observed at 83x due to faint stars nearby.) 2016 8 6.944 S 13.4 AQ 30.5T 139 0.7 3 DIJ Burlage 2016 8 6.943 S 13.4 AQ 30.5T 139 0.7 3/ BOU Burlage, Germany 2016 8 3.12 S 12.5 AU 22.0L 160 1 4 GOI Araçatuba 2016 7 31.977 S 13.6 AQ 30.5T 179 0.7 3/ BOU Burlage, Germany 2016 7 31.973 S 13.8 AQ 30.5T 179 0.6 2/ DIJ Burlage 2016 7 31.42 M 13.5 AQ 25.0L 83 1 4 WYA Walcha, NSW (Coma diffuse, moderately condensed centre, sometimes appears faintly stellar in good seeing.) 2016 7 29.49 S 13.4 AQ 25.0L 83 0.6 3 WYA Walcha, NSW (Coma very diffuse with slight brightening to centre.) 2016 7 28.44 S 13.5 AQ 25.0L 83 0.7 2/ WYA Walcha, NSW (Coma diffuse, slightly brighter in centre.) 2016 7 25.41 S 13.6 AQ 25.0L 83 1 2/ WYA Walcha, NSW (Coma small, diffuse with slight brightening to centre.) 2016 7 3.02 S 12.9 AQ 20.3T 133 0.9 3 GON Alto del Castro - Aralla, León 2016 7 2.51 S 13.4 AQ 25.0L 83 0.8 3 WYA Walcha, NSW (Coma small and opaque with slightly brighter centre. Faintly visible at 39x. Does not enhance in Swan band filter.) 2016 6 28.53 S 13.5 AQ 25.0L 83 0.8 3 WYA Walcha, NSW (Does not enhance in Swan Band filter. Outer coma faint and brightening slightly to weakly condensed inner coma. Sky hazy although transparent. Ground fog present.) 2016 6 8.74 S 14.4 AQ 25.0L 166 0.6 3 WYA Walcha, NSW (Coma diffuse and weakly condensed. Difficult to see except in periods of good seeing where it is easily viewed.)
2003 10 13.44 S[14.0 HS 28.0T 310 ! 1 MAT Wallaroo, SA 2003 7 17.43 S 14.0:HS 28.0T 310 0.5 6 MAT Wallaroo, SA (In close proximity to mag 13.7 star.) 2003 7 2.88 S 13.4:HS 20.3L 108 0.5 4 GUZ Krosno (Excellent conditions, NEL ~6.9.) 2003 6 24.90 S 13.5:HS 20.3L 108 0.5 4 GUZ Krosno (Excellent conditions, NEL ~6.7.) 2003 6 7.99 S 13.8:HS 20.3L 108 0.5 4 GUZ Krosno (Excellent conditions, NEL ~6.9.) 2003 6 3.92 S 13.8:HS 20.3L 63 0.5 4 GUZ Krosno (Excellent conditions, faintest stars visible to the telescope were 14.7, NEL ~7.0.) 2003 6 3.48 S 14.2 HS 28.0T 310 0.5 5 MAT Wallaroo, SA 2003 5 25.57 S 14.3:HS 28.0T 310 0.5 5 MAT Wallaroo, SA