Telescopic comet Schwassmann-Wachmann 1, Orimattila, Artjärvi, Tähtikallio

29P/ (Schwassmann-Wachmann 1) A periodic Jupiter family comet was imaged on the first night of the 2022 November talcos. Eruptions sometimes happen in the comet, that's why we have tried to photograph several times. The comet's orbit is outside the orbit of Jupiter and comes close to Jupiter 2037 to less than 1au. Eruptions may increase the brightness by 1-5 mag. The size of the large comet nucleus is 60.4 km. When photographing, the comet was 5.3204au away, at its closest 5.078au on December 29, 2022. The comet is now in its normal state. I measured the brightness T15.4mag with the Astrometrica program, it differs considerably from the predictions.

1 Image sum image according to stars L120s 1-11 from a stack of images, movement is not visible. There are no asteroids under 20.6 mag in the picture.

2Fig. first image of the series1 L120s measured, 2022-11-18 22:53:16UT 2459902.45365JDUT 06h56m31.24s +29d14'57.6" N16.159mag Std Dev 360.702 SNR74.206 FWHM5.487" ,JPL Horizon 22:56h216UT +29d14'56.8" T17.24mag .

3Fig. last image of the series11 L120s measured, 2022-11-18 23:13:57UT 2459902.46802JDUT 06h56m31.04s +29d14'58.0" N16.068mag Std Dev 427.764 SNR73.605 FWHM4.825" ,JPL Horizon 23:376m31.04sUT +29d14'57.3" T17.24mag .

TYC 1906-1497-1 v.12.45 mag star used for brightness measurement calibration.

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Telescopic comet Schwassmann-Wachmann 1 - 19.11.2022 at 00.53 - 19.11.2022 at 01.14 Orimattila, Artjärvi, Tähtikallio Observation number 111347