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Ursa Astronomical Association
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Ursa Astronomical Association

Nova M81 PNV J09554017+6902478 - 3.10.2021 at 05.20 - 3.10.2021 at 05.35 Orimattila, Artjärvi, Viestikallio Observation number 101689

Visibility I / V

Jorma Ryske, Etelä-Suomen kosmol. seura

A possible nova has been observed in the M81 galaxy, according to the announcement received yesterday, October 2, 2021, around mag20 various very dim. At the end of a gusty night, I exposed the light from the M81 through a 16 * 1min Baader Clear filter to see if it could be seen. The boundary magnitude in a single 60s exposed image is about 19.0, so moving the limits of the vehicle’s performance is moving. In addition, the M81 effectively obscures Nova, which may be quite close to its core, with its light, so a negative observation of this is recorded even if something ashy at the assumed point may be visible.

Figure 1) 16 * 60s, Baader Clear, bin2, 2021-10-03T02: 19 UT

Figure 2) 16 * 60s, Baader Clear, bin2, crop, Nova's assumed location marked

Observation notification links and discovery image:

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Additional information
  • Observation target
    • Nova
  • Designation
    • M81 PNV J09554017+6902478
  • Constellation
    • Ursa Major
  • Brightness in magnitudes
    • 20
Technical information

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

Moon 15%, 7C, wind gusts, SQM-Clear 20.72, Limiting magnitude 19.0

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