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

Year Mn Day    MM  Mag Ref Scope Pwr coma  DC tail p.a. Obs  Site
2019  8 28.41   S 14.8 AQ  40.0L 261  0.5  2/           WYA  Walcha, NSW
(Very diffuse, small with weakly condensed centre. Seeing poor, sky slightly hazy with raised dust.)
2019  7 23.42   S 14.3 AQ  40.0L 108  0.8  5/           WYA  Walcha, NSW
(Coma small, opaque. Stellar pseudo-nucleus visible in periods of good seeing.)
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  3  7.80   M 13.2 AQ  40.6L 165  1.2  3            CAM  Katherine, NT
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.)