* * * * * C/2017 M4 (ATLAS) * * * * *

Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2019 5 30.38 M 13.5 AQ 25.0L 83 0.9 5/ WYA Walcha, NSW (Small coma, opaque centre with stellar pseudo-nucleus visible in good seeing.) 2019 5 8.46 S 12.8 AQ 25.0L 39 2 3 WYA Walcha, NSW (Coma diffuse, slightly brighter at centre but weakly condensed.) 2019 5 6.44 M 13.2 AQ 25.0L 83 1.3 5/ WYA Walcha, NSW (Coma small, sometimes appears stellar in good seeing, diffuse outer coma.) 2019 2 9.71 M 13.3 AQ 25.0L 83 0.8 3 WYA Walcha, NSW (Small, difficult and diffuse. Sometimes appears stellar at centre.) 2018 10 7.43 S 14.0 HS 40.0L 257 0.4 3/ YOS Kita-karuizawa, Gunma (Tiny.) 2018 9 17.46 S[13.7 TA 40.0L 257 !0.4 YOS Kita-karuizawa, Gunma ((Not visible due to strong moonlight.) 2018 9 6.47 M 14.0 AQ 40.6L 165 0.7 3 CAM Katherine, NT 2018 9 3.48 M 14.0 AQ 40.6L 165 0.8 3 CAM Katherine, NT 2018 8 31.46 M 13.9 AQ 40.6L 165 0.7 4 CAM Katherine, NT 2018 8 13.47 M 14.0 AQ 40.6L 266 0.7 4 CAM Katherine, NT 2018 8 11.46 M 14.1 AQ 40.6L 266 0.8 4 CAM Katherine, NT 2018 8 10.46 M 14.3 AQ 40.6L 266 0.8 4 CAM Katherine, NT 2018 8 9.45 M 14.0 AQ 40.6L 266 0.6 4 CAM Katherine, NT 2018 8 8.40 S 14.1 AQ 25.0L 83 0.6 3 WYA Walcha, NSW (Difficult. Small diffuse coma.) 2018 8 7.47 M 14.1 AQ 40.6L 165 0.7 4 CAM Katherine, NT 2018 8 1.37 S 14.2 AQ 25.0L 83 0.8 2/ WYA Walcha, NSW (Difficult, very diffuse. Visible in good seeing.) 2018 7 31.45 M 14.0 AQ 40.6L 165 0.8 4 CAM Katherine, NT 2018 7 30.37 S 14.1 AQ 25.0L 83 0.7 3 WYA Walcha, NSW (Difficult due to glare from bright star in field. Visible in periods of good seeing with bright star just out of field. Coma small.) 2018 7 17.52 M 14.0 AQ 40.6L 266 0.5 5 CAM Katherine, NT 2018 7 13.51 S 13.6 UV 40.0L 257 0.4 6 YOS Kita-karuizawa, Gunma (Tiny, but clearly visible.) 2018 6 12.98 I 14.4 HN 20.3T 133 9 GON Pandorado, León (Quasi-stellar appearance. Nearby field stars checked in DSS. Comparison stars taken from Henden photometry near DQ Her.)