Contact information

Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Kaukoputkella näkyvä komeetta ATLAS - 9.12.2020 klo 21.44 - 10.12.2020 klo 03.14 Helsinki, Maunula Observation number 95203

Visibility II / V

Jorma Ryske, Etelä-Suomen kosmol. seura

C/2020 M3 (ATLAS) is moving farther away from earth but is still relatively near at distance 0,45AU. I tried to observe comets rotating CN gas jet which was visible earlier 20.11.2020. Seems that the CN jet is still visible but clear rotation is no more observable.

Figure 1) CN 387nm filter 18*5min exposure starting at 2020-12-09 22:47UT, showing large 15' (equivalent to 300 000 km) cyanogen coma around oval shaped optocenter. FoV 36' x 29'.

Figure 2) G filter 20x20s image at 2020-12-09 19:56UT showing tail 4'. FoV 36' x 29'.

Figure 3) R filter 20x20s image at 2020-12-09 19:44UT showing dust tail 3'.

Figure/Animation 4) CN 387nm 10 frames each 30min processed with CometCIEF, 2020-12-09 20:06UT-01:14UT. FoV 9'x9'.

More similar observations
Additional information
  • Havainnon kohde
    • Komeetta
  • Kohteen nimi
    • C/2020 M3 (ATLAS)
  • Kirkkaus magnitudeina
    • 9
  • Pyrstön pituus
  • 4 kaariminuuttia
  • Pään läpimitta
  • 15 kaariminuuttia
  • Sää
    • -2C,some thin clouds passing occasionally. SQM-L Zenit 18,20.
  • Komeetan otsikko
    • Kaukoputkella näkyvä komeetta
Technical information

TS 305/1200mm Newton, TS KomakorrF4, QSI690, Astrodon R bin2, G bin2, Semrock CN 387nm/15nm bin3, CEM60. FoV 36' x 29', animation 9'x 9'. Pixel size bin3 1.90"/px, bin2 1.26". North up, east left.

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