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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Kaukoputkella näkyvä komeetta ATLAS - 9.4.2020 klo 22.10 - 9.4.2020 klo 23.27 Helsinki, Maunula Observation number 89793

Visibility III / V

Jorma Ryske, Etelä-Suomen kosmol. seura

Comet C/2019 Y4 (ATLAS) optocenter is strongly oval shaped in all colour channels RGB and UV/CN and there is not point like optocenter visible representing comet's possible disintegration. Moon phase was 95% but fortunately it was low in the sky.

Image 1) Crop of Astrodon R filter (image 3) showing strongly oval shaped optocenter. One fragment can be seen preceding/leading very close optocenter, measured 9" towards PA 290° / "2:30 o'clock"
Image 2) Astrodon G filter showing 7' diameter coma and 11' tail towards PA 95°, exposure time 10 minutes.
Image 3) Astrodon R filter showing 3' diameter coma and 8' dust tail towards PA 95°, exposure time 15 minutes.
Image 4) Astrodon B filter showing 4' diameter coma and 9' tail towards PA 95°, exposure time 10 minutes.
Image 5) CN 387nm narrowband filter showing cyanogen 3883Å gas coma about 9' diameter and dim tail towards PA 95°. Exposure time 25 minutes.
Image 6) Image 5 processed with CometCIEF showing strognly oval shaped optocenter 30" long and wide tail/jet towards PA 95°  .  

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Additional information
  • Havainnon kohde
    • Komeetta
  • Kohteen nimi
    • C/2019 Y4 (ATLAS)
  • Kirkkaus magnitudeina
    • 8,5
  • Pyrstön pituus
  • 11 kaariminuuttia
  • Pään läpimitta
  • 7 kaariminuuttia
  • Sää
    • +4C
  • Komeetan otsikko
    • Kaukoputkella näkyvä komeetta
Technical information

TS 305/1200mm Newton, TS KomakorrF4, QSI690, Astrodon R, G, B, Semrock CN 387nm/15nm, CEM60. FoV 36' x 29'. North up, east left.

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