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Ursa Astronomical Association

Telescopic comet ATLAS - 4.12.2021 at 23.51 - 5.12.2021 at 00.12 Orimattila, Artjärvi, Tähtikallio Observation number 103045

Visibility IV / V

C / 2019 L3 (ATLAS) The comet was filmed on the second night of the December campaigns. The asteroid Terrestrial-Impact Last Alert System (ATLAS) discovered a comet as an asteroid on June 10, 2019 with the ATLAS-1 telescope in Haleakala, Hawaii. When the comet was found it was 8.5au from the sun. The comet in its perihelion on January 9, 2022 is 3.55au away from the sun. When photographing the comet was 2.7567au at a distance, the nearest comet is January 7, 1922 2.58au.

1Picture The sum of the stack by comet. A wide stretched comma 235 "(3.9 ') and perhaps a 906" (15.3') bifurcated tail?

2Picture Same stack MaximDL Histogram Specification Gaussian stretch. Below the center of Koma with a bright star.

3Picture sum view according to the stars L120s 1-11 image stack, motion is displayed. Asteroid (298698) 2004 EH39 19.989mag, motion not shown. No other asteroids below 20.3 mag are shown.

4Picture. first image in the series1 L120s measured, 2021-12-04UT 21: 50: 54UT 2459553.41034JDUT 07h37m35.31s + 37d02'23.7 "N10.895mag Std Dev 3788.123 SNR380.519 FWHM12.854", JPL Horizon 21: 50: 54UT 07h37m34.96s + 37d02'24.3 "T12.361 / N13.771 mag.

5Picture. last image in the series11 L120s measured, 2021-12-04UT 22: 11: 47UT 2459553.42484JDUT 07h37m34.35s + 37d02'18.6 "N10.787mag Std Dev 3788.455 SNR501.787 FWHM13.532", JPL Horizon 22: 11: 47UT 07h37m34.34s + 37d02'17.9 "T12.361 / N13.771 mag.

TYC 2465-1543-1 v.11.58mag stars used to calibrate brightness measurement.

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Additional information
  • Observation target
    • Comet
  • Title for the comet
    • Telescopic comet
  • Name of the observation target
    • C/2019 L3 (ATLAS)
  • Brightness in magnitudes
    • 9.5
  • Tail length
  • 15.3 arc minutes
  • Coma diameter
  • 3.9 kaariminuuttia
Technical information

Alluna RC16, C415 / 3320, Moravian G4-16000EC MkII, filter L, bin3 11 x 120s

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