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Ursa Astronomical Association

Telescopic comet Schwassmann-Wachmann - 4.12.2021 at 17.54 - 4.12.2021 at 18.18 Orimattila, Artjärvi, Tähtikallio Observation number 103122

Visibility I / V

29P / (Schwassmann-Wachmann 1) The periodic comet of the Jupiter family was filmed on the second night of the December 2021 campaign. Outbreaks sometimes occur in a comet, which is why we have tried to shoot several times. The comet's orbit is outside Jupiter's orbit and will be close to Jupiter 2037 less than 1au away. Discharges may increase the brightness by 1-5 mag. The size of the large comet's core is 60.4km. At the time of filming, the comet was 4.9628 at its nearest, 4.82au on November 6, 2020. Filming began during the astronomical twilight.

1Picture The sum of the stack by comet. The comet returned to normal from its brightening a month ago.

2Picture Same stack MaximDL Histogram Specification with Straight-Line stretch. A comet is a fragmentary comma.

3Image sum view according to the stars L120s 1-12 image stack, motion is displayed. No asteroids less than 18.6 mag in the picture.

4Picture. first image in the series1 L120s measured, 2021-12-04UT 15: 53: 43UT 2459553.16230JDUT 04h35m19.54s + 31d53'43.8 "N16.809mag Std Dev 37.355 SNR6.735 FWHM8.243", JPL Horizon 15: 53: 43UT 04h35m19.63s + 31d53'44.7 "T15.560mag.

5Picture. last image in the series11 L120s measured, 2021-12-04UT 16: 17: 26UT 2459553.17877JDUT 04h35m19.05s + 31d53'45.2 "N16.357mag Std Dev 53.333 SNR3.530 FWHM7.923", JPL Horizon 16: 17: 26UT 04h35m19.08s + 31d53'43.3 "T15.560mag.

TYC 2373-345-1 v.12.33mag 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
    • 29P/Schwassmann-Wachmann
Technical information

Alluna RC16, C415 / 3320, Moravian G4-16000EC MkII, filter L, bin3 12 x 120s

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