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Ursa Astronomical Association

Binocular comet Churyumov-Gerasimenko - 4.12.2021 at 23.25 - 4.12.2021 at 23.46 Orimattila, Artjärvi, Tähtikallio Observation number 103143

Visibility I / V


67p / (Churyumov-Gerasimenko) The periodic comet of the Jupiter family was filmed on the second night of the December 2021 campaign. The comet was discovered by Soviet astronomers Klim Ivanovych Churyumov (Ukrainian) and Svetlana Ivanovna Gerasimenko (Kazakh) on October 22, 1969 at the Fesenkov Observatory of the Alma-Ata Space Physical Institute (210 Alma-Ata), with a 50cm Maksutov telescope. Professor Klim Churyumov has been the director of the Kiev Planetarium and the chairman of the Ukrainian Association of Amateur Astronomers. Source Wikipedia https://en.wikipedia.org/wiki/Klim_Churyumov . Professor Churyumov has written a total of more than 1,000 popular articles and 7 popular books. Source Peter Bond Esa Rosetta interview https://sci.esa.int/web/rosetta/-/54598-klim-churyumov . The comet probe Esa Rosetta visited the comet in 2014-2016. Source Wikipedia https://en.wikipedia.org/wiki/Rosetta_(spacecraft) . When filming, the comet was 0.4297au away, the closest 0.4182au on November 12, 2021.

1Picture The sum of the stack by comet. The change in weather is indicated by the streaks.

2Picture Same stack MaximDL Histogram Specification with Straight-Line stretch. Coma 143 "(2.4 '), tail in Figure 953" (15.9'), tail extending over image area.

3Picture sum view according to the stars L120s 1-11 image stack, motion is displayed. Asteroid (44147) 1998 HB103 18.494mag, motion not shown. Asteroid (47087) 1999 AY3 18.910mag, motion not shown. Asteroid (76694) 2000 HZ79 19.379, motion shown. No other asteroids under 19.6 mag are shown. During the shooting, the weather condition improved all the time, which is the reason for the change in the measurement results.

4Picture. first image in the series1 L120s measured, 2021-12-04UT 21: 24: 50UT 2459553.39224JDUT 08h51m16.81s + 27d07'57.9 "N12.513mag Std Dev 554.792 SNR15.305 FWHM7.673", JPL Horizon 21: 24: 50UT 08h51m16.71s + 27d07'57.8 "T12.293mag.

5Picture. last image in the series11 L120s measured, 2021-12-04UT 21: 45: 42UT 2459553.40673JDUT 08h51m18.07s + 27d07'58.6 "N13.882mag Std Dev 360.861 SNR28.937 FWHM12.476", JPL Horizon 21: 45: 42UT 08h51m17.87s + 27d07'59.9 "T12.293mag.

TYC 1946-355-1 v.12.46mag stars used to calibrate brightness measurement.



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Additional information
  • Observation target
    • Comet
  • Title for the comet
    • Binocular comet
  • Name of the observation target
    • 67P/Churyumov-Gerasimenko
  • Tail length
  • 15.8 arc minutes
  • Coma diameter
  • 2.4 kaariminuuttia
  • Weather
    • Säätila parani kuvauksen aikana paljon.

Technical information

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

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