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* * * * * C/2019 Y4 (ATLAS) * * * * *
Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2020 5 18.89 S 9.3 TK 40.7L 72 4 2 0.6 40 BIV 2020 5 18.14 S 8.2 TK 20.3T 77 4 1/ GON Puerto de la Cubilla, Asturias (Astronomical twilight. Altitude 7°.) 2020 5 15.89 S 9.5 TK 40.7L 72 5 2 0.3 45 BIV 2020 5 14.940 S 9.4 TA 15.6L 36 3.5 0/ 0.2 42 BOU Westerwijtwerd (Difficult, very diffuse object close to open cluster NGC 1545. Altitude 16.5°.) 2020 5 14.912 S 9.3 TA 15.5L 42 3.1 1/ DIJ Burlage 2020 5 13.927 S 8.9 TA 15.5L 42 3.5 3 11m 35 DIJ Burlage 2020 5 13.926 S 9.2 TA 15.6L 36 4 1/ 0.2 40 BOU Westerwijtwerd (Faint, very diffuse object with very faint, broad dust tail. Altitude 18.8°.) 2020 5 13.91 S 9.2:TK 20.0L 42 & 6 1 SCH Eerbeek (Only seen with averted vision. Elongated coma? Altitude 19° [twilight].) 2020 5 13.89 S 9.6 TK 40.7L 72 6 2 0.5 50 BIV 2020 5 12.988 S 9.0 TA 15.5L 42 3.0 4 11m 30 DIJ Burlage 2020 5 11.91 S 9.1 TK 20.0L 42 & 5 2 SCH Eerbeek (Slightly oval coma.) 2020 5 11.88 S 9.8 AQ 40.7L 72 4 2 0.35 70 BIV 2020 5 11.901 S 9.0 TA 15.5L 42 3.5 3 DIJ Burlage 2020 5 1.89 S 10.7 AQ 40.7L 72 3 1 BIV 2020 4 26.962 S 9.5 TA 15.5L 42 6.1 2 DIJ Burlage 2020 4 26.93 S 9.2 TK 20.0L 42 & 5 2 SCH Eerbeek 2020 4 25.91 S 9.8 TK 20.0L 42 & 5 1 SCH Eerbeek (Very diffuse coma.) 2020 4 25.89 S 10.0 AQ 40.7L 72 4 1 BIV 2020 4 23.88 S 10.2 AQ 40.7L 72 3 1 BIV 2020 4 22.90 S 8.8:TK 8.0B 15 &10 1 SCH Eerbeek (Difficult observation. Very diffuse and big coma, only visible with averted vision. In 20.0L at 42x, clearly elongated coma of about 10x4' in p.a. 60 deg.) 2020 4 22.894 S 9.2 TA 8.0B 15 8 2 BOU Westerwijtwerd 2020 4 22.88 S 10.1 AQ 40.7L 72 4 1 BIV 2020 4 22.879 S 9.3 TA 15.5L 29 3.8 2/ DIJ Burlage 2020 4 21.876 S 9.2 TA 15.5L 29 3 3 12m 65 DIJ Burlage 2020 4 20.894 S 9.3 TA 8.0B 15 7 2 BOU Westerwijtwerd 2020 4 20.89 S 8.9 TK 8.0B 15 &12 1/ SCH Eerbeek 2020 4 20.87 S 9.3 TK 20.0L 42 2 SCH Eerbeek (Elongated coma approx. 5x8’.) 2020 4 19.895 S 9.8 TK 32.0L 60 1 LOO Genk (Elongated coma 4.8x2' fading into sky background.) 2020 4 20.866 S 9.3 TA 15.5L 42 4.8 3 DIJ Burlage 2020 4 19.884 S 9.1 TA 8.0B 15 7.5 2 BOU Westerwijtwerd 2020 4 19.88 S 9.1 TK 20.0L 42 & 7 2 SCH Eerbeek 2020 4 19.858 S 9.6 TA 15.5L 42 4.2 2/ DIJ Burlage 2020 4 18.886 S 9.3 TA 8.0B 15 6 2 BOU Westerwijtwerd 2020 4 18.88 S 10.3 AQ 40.7L 72 4 1 BIV 2020 4 18.867 S 9.2 TA 15.5L 42 4.5 2/ DIJ Burlage 2020 4 17.88 S 8.9 TK 8.0B 15 & 8 2 SCH Eerbeek 2020 4 17.873 S 9.3 TA 15.6L 29 5.7 3 BOU Westerwijtwerd (Faint inner coma elongated roughly in an E-W direction.) 2020 4 17.87 S 9.0 TK 20.0L 42 & 7 1 SCH Eerbeek 2020 4 17.870 S 9.5 TA 15.5L 42 4.5 2 DIJ Burlage 2020 4 17.86 S 10.7 AQ 40.7L 72 3 1 BIV 2020 4 16.892 S 9.4 TA 15.6L 29 6.5 2/ BOU Westerwijtwerd (Faint inner coma elongated roughly in an E-W direction.) 2020 4 16.859 S 9.6 TA 15.5L 29 4.5 1/ DIJ Burlage 2002 4 16.858 B 9.5 TK 8.0B 20 4 2 SZA Truszczyny 2020 4 15.887 S 9.4 TA 15.6L 29 5.5 2/ BOU Westerwijtwerd (Faint inner coma elongated roughly in an E-W direction.) 2020 4 15.88 S 9.9 AQ 40.7L 72 4 2 BIV 2020 4 14.88 S 9.3 TK 20.0L 42 & 8 2 SCH Eerbeek 2020 4 14.875 S 9.0 TK 32.0L 60 2 LOO Genk (Elongated coma 5x1.5' fading into sky background. No nuclei (cc) visible.) 2020 4 14.849 S 9.1 TA 15.5L 29 3.8 3 DIJ Burlage 2020 4 13.88 S 9.9 AQ 40.7L 72 3 2 0.1 80 BIV 2020 4 12.885 B 8.9 TK 8.0B 20 5.5 3 SZA Truszczyny 2020 4 12.88 S 9.8 AQ 40.7L 72 3.5 2 BIV 2020 4 12.864 S 9.0 TA 15.5L 29 4.5 3 DIJ Burlage (Star of magn. 10.9 in coma.) 2020 4 11.88 S 8.9 TK 20.0L 42 & 7 1/ SCH Eerbeek 2020 4 11.877 S 9.3 TA 15.6L 29 6 3 BOU Sint Annen (Considerably fainter and more diffuse than 2 weeks ago. Faint inner coma elongated roughly in an E-W direction.) 2020 4 11.853 S 9.4 TA 15.5L 42 3.5 2/ DIJ Burlage (Oval coma 3.5x2.2'.) 2020 4 10.89 S 9.4 AQ 40.7L 72 6 2 BIV 2020 4 10.85 S 8.8 TK 20.0L 42 & 7 2 SCH Eerbeek 2020 4 10.848 S 9.5 TK 32.0L 60 4 2 LOO Genk 2020 4 9.88 S 9.0 TK 20.0L 42 & 4 3 SCH Eerbeek (Nearly full moon at altitude 5°, comet more weak/diffuse than a week ago. Star of magn. 11.5 in coma.) 2020 4 9.851 S 9.1 TA 15.5L 29 2.2 2/ DIJ Burlage 2020 3 31.11 S 7.6 TK 8.0B 15 &15 2 SCH Eerbeek 2020 3 31.100 M 8.3 TA 15.5L 29 8 5 DIJ Burlage 2020 3 30.007 M 8.3 TA 15.5L 29 8 5 DIJ Burlage 2020 3 29.823 S 8.7 TK 10.0B 14 3 3 LOO Genk 2020 3 28.957 M 8.2 TA 15.5L 29 8.5 5/ DIJ Burlage 2020 3 28.948 M 7.8 TA 8.0B 15 10 4 BOU Westerwijtwerd 2020 3 28.87 S 7.7 TK 8.0B 15 &15 2 SCH Eerbeek 2020 3 27.935 M 7.9 TA 8.0B 15 10 4/ BOU Sint Annen (Stars of magn. 10.4 and 10.7 [AQ] inside coma.) 2020 3 27.918 M 8.2 TA 15.5L 29 13 5 DIJ Burlage 2020 3 27.84 S 7.7 TK 8.0B 15 &15 2 SCH Eerbeek (Comet in group of faint stars, m = 10-11.) 2020 3 26.860 M 8.4 TA 15.5L 24 18 5 DIJ Burlage 2020 3 26.858 M 8.2 TA 15.5L 24 7.5 4 BOU Burlage, Germany 2020 3 25.812 B 8.7 TK 8.0B 20 4 SZA Truszczyny 2020 3 24.858 B 9.1 TK 10.0B 20 3 SZA Truszczyny 2020 3 24.83 S 8.4 TK 8.0B 15 &12 2 SCH Eerbeek 2020 3 23.864 S 9.3 TK 10.0B 20 3 3 LOO Genk (Some interference from nearby star.) 2020 3 23.828 M 8.3 TA 15.6L 24 9 4/ BOU Sint Annen (Star of magn. 10.4 [AQ] in coma.) 2020 3 23.813 M 8.5 TK 15.5L 42 9 5 DIJ Burlage 2020 3 22.84 S 8.4 TK 8.0B 15 &12 2 SCH Eerbeek 2020 3 22.84 S 8.9 TK 20.0L 42 & 6 3 SCH Eerbeek 2020 3 22.829 S 8.3 TA 15.6L 24 10 4 BOU Sint Annen (Difficult observation due to star of magn. 9.8 in coma.) 2020 3 22.810 M 8.9 TK 15.5L 29 10 5 DIJ Burlage 2020 3 21.85 S 8.9 TK 8.0B 15 &10 3 SCH Eerbeek 2020 3 21.85 S 9.0 TK 20.0L 42 7 4 SCH Eerbeek 2020 3 21.835 S 8.4 TA 15.5L 24 8.5 5 DIJ Burlage 2020 3 21.834 M 8.2 TA 15.5L 24 9.5 3/ BOU Burlage, Germany 2020 3 21.826 S 9.9 TK 32.0L 57 3 3 ‘ LOO Genk 2020 3 21.43 S 8.9 TJ 40.0L 36 6.5 2/ YOS Mt. Tsukuba, Ibaraki (Diffuse with weak condensation. I also enjoyed M81 and M82, although they located somewhat far away.) 2020 3 21.16 S 8.5 TK 20.0L 42 5 2 SCH Eerbeek 2020 3 20.827 S 8.5 TA 8.0B 15 8 2 BOU Sint Annen (Comet close to star of magn. 8.9.) 2020 3 20.822 S 8.2 TK 15.5L 29 8 5/ DIJ Burlage 2020 3 17.909 S 8.6 TA 5.0B 10 9 2 BOU Sint Annen 2020 3 17.85 S 9.0 TK 20.0L 42 & 7 2 SCH Eerbeek 2020 3 17.846 S 8.6 TK 15.5L 29 6.3 5 DIJ Burlage 2020 3 16.965 S 8.8 TK 15.5L 29 6.4 5 DIJ Burlage 2020 3 16.826 S 8.8 TA 15.6L 24 8 3 BOU Sint Annen 2020 3 15.88 S 9.3 AQ 40.7L 72 8 4 0.2 110 BIV 2020 3 14.85 S 8.2 TK 5.0B 10 12 3 GON Alto del Castro, León 2020 3 13.835 M 9.5 TA 25.4J 47 5.5 3/ BOU Sint Annen 2020 3 12.90 S 9.6 TK 40.7L 72 7 4 BIV 2020 3 12.865 S 9.1 TK 15.5L 29 4 5 DIJ Burlage 2020 3 12.815 S 9.6 TA 25.4J 47 5 3/ BOU Sint Annen 2020 3 12.81 S 8.9 TK 20.0L 42 & 7 2 SCH Eerbeek 2020 3 3.171 S 12.0 AQ 25.4J 72 2.5 2/ BOU Sint Annen 2020 2 22.96 S 13.1:AQ 40.7L 135 2.0 2 BIV 2020 2 22.03 S 13.7 AQ 40.7L 135 1.3 3 BIV 2020 2 19.94 S 11.7 TK 20.3T 77 3 2 GON Alto del Trichero, León