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Name / Constellation

NGC 2805

 Other: UGC 4936, MCG +11-12-003, PGC 26410

UMa
Coordinates AR: 09h 20m 20.3s , +64° 06′ 10.7s
Optics Officina Stellare 10" f8 Richtey-Cretien
Camera-Mount PLAYERONE POSEIDON M-PRO - ZWO ASI 1600M (ONAG)- 10Micron GM2000 QCI Mount
Filters Antlia V-Pro LRGB
Exposure
  • Luminance
  • Red
  • Green
  • Blue
  • 83 x 300 sec - 6 hours 50min
  • 27 x 300 sec - 2 hours 15min
  • 24 x 300 sec - 2 hours
  • 24 x 300 sec - 2 hours
  • Binning 3
  • Binning 3
  • Binning 3
  • Binning 3
Location / Date Promiod (Valle D'Aosta-Italy) "TLP" Remote Observatory - Mar 2025
Seeing 2.6" @ 1.17 arcosec/pixel binning 3
Note Crescent Moon first 2-3 hours - Drizzle 2X in postprocessing (Pixinsight))
Acquisition N.I.N.A.
Processing Adobe Photoshop CC -
Comment

 

NGC 2805 is a intermediate spiral galaxy in the constellation of Ursa Major. Its velocity with respect to the cosmic microwave background is 1834 ± 7 km/s, which corresponds to a Hubble distance of 27.05 ± 1.90 Mpc (~88.2 million light-years). However, 11 non redshift measurements give a distance of 12.76 ± 11.89 Mpc (41.6 million light-years). The galaxy was discovered by German-British astronomer William Herschel on 2 April 1791.
One supernova has been observed in NGC 2805: SN 2019hsw (type II, mag. 15.4) was discovered by ASAS-SN on 18 June 2019.


NGC 2805 Group
NGC 2805 is the namesake of the NGC 2805 group (also known as LGG 173), which includes at least 4 other galaxies: NGC 2814, NGC 2820, NGC 2880, and IC 2458. This group, minus NGC 2880, are also collectively called Holmberg 124.