Binocular comet Leonard - 5.12.2021 at 05.47 - 5.12.2021 at 05.55 Orimattila, Artjärvi, Viestikallio Observation number 102781

Visibility III / V

Jorma Ryske, Etelä-Suomen kosmol. seura

Comet C / 2021 A1 (Leonard) is relatively close to Earth at 0.42 AU and moves very fast relative to the stars. The attached 15x30s = 7.5min exposed L / Clear filter images show only a portion (less than 1 °) of the comet's long tail, which consists of several rapidly changing fan-shaped structures. Coma diameter 12 '.

Figure 1) 15x30s L / Clear filter, stacked according to the comet's optocenter. Start 2021-12-05_0347 UTC.

Figure 2) Animation 15 frame 30s, the comet's fast motion is shown during ~ 8 minute exposures. Start 2021-12-05_0347 UTC.

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Additional information

Observation target
- Comet
Visibility of the comet
- Binocular comet
Name of the observation target
- C/2021 A1 (Leonard)
Brightness in magnitudes
- 7
Tail length
1 degrees

Coma diameter
12 kaariminuuttia
Weather
- -16C, pakkasutua

Technical information

TS 305 / 1200mm Newton, TS KomakorrF4, QSI690 / ICX814, filter Baader Clear, mount CEM60. FoV 36 'x 28'. North up, east left.

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Binocular comet Leonard - 5.12.2021 at 05.47 - 5.12.2021 at 05.55 Orimattila, Artjärvi, Viestikallio Observation number 102781