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Ursa Astronomical Association

Telescopic comet Kowal - 4.12.2021 at 19.25 - 4.12.2021 at 19.46 Orimattila, Artjärvi, Tähtikallio Observation number 103178

Visibility II / V

104P / (Kowal) 2 (1979 B1,1991 X1) The periodic NEO comet of the Jupiter family was filmed on the second night of the December 2021 work. The American astronomer Charles Thomas Kowal (1940-2011) discovered a comet on January 13, 1979 at the Palomar Observatory (675, Palomar Mountain). It was later discovered that the comet had already been spotted by Leo Boethhin in 1973. Source Wikipedia . Kowal has found comets 99P / Kowal, 104P / Kowal, 134P / Kowal-Vavrova, 143P / Kowal-Mrkos, and 158P / Kowal-LINEAR, as well as 22 asteroids. Other discoveries include 81 supernovae and the first Centaur 2060 Chiron in 1977, subsequent centaurs were not discovered until 15 years later. Source Wikipedia . Finding a comet by GARY W. KRONK'S COMETOGRAPHY . The size of the comet's core is estimated at 2km. In Perihel, the comet is January 11, 2022. When photographing, the comet was 0.7416au away, the closest 0.332au on January 24, 2022.

1Picture The sum of the stack by comet. Changing weather conditions are shown on the streaks, a couple of images removed from the series.

2Image sum image according to the stars L120s 1-11 stack of images, No less than 19.3mag asteroids in the image. The movement is displayed.

3Picture. first image in the series1 L120s measured, 2021-12-04UT 17: 25: 10UT 2459553.22581JDUT 22h40m22.90s -09d33'07.7 "N16.473mag Std Dev 61.513 SNR12.255 FWHM9.224", JPL Horizon 17: 25: 10UT 22h40m22.78s -09d33'06.4 "T16.794mag.

4Picture. last image in series 11 L120s measured, 2021-12-04UT 17: 46: 05UT 2459553.24033JDUT 22h40m24.90s -09d33'04.0 "N17.281mag Std Dev 51.869 SNR8.299 FWHM5.290", JPL Horizon 17: 46: 05UT 22h40m24.89s -09d33'01.8 "T16.794mag.

TYC 5812-952-1 v.11.241mag 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
    • 104P/Kowal
  • Weather
    • Säätila vaihteli nopeasti.

Technical information

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

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