Deep Sky Object in Spring
UGC8837(Holmberg IV, Galaxy in Ursa Major)


Date & Time: Feb 21 2026, from 23:13 to 24:07 JST(+0900)
Composed 10 shots with 6 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with IDAS LPS-P1 Light-pollution suppression filter
Auto-guided with Meade LX200 Equatorial & Lacerta M-GEN
Digital Camera: Nikon D810A
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(4080×4080)
Device Size...20×20mm
Sensitivity...ISO4000, White Balance...Daylight


UGC8837 / Galaxy, type IB(s)m sp
R.A.13h 54m 44.7s (2000.0)
Dec.+53°54' 07" (2000.0)
Apparent Size4.8×1.3'
Radial Velocity+107km/s
Magnitude13.8
Distance24 million light yrs.
Group of GalaxiesM101 Group
Other IDsCGCG 272-13, MCG +9-23-17
DDO 185, PGC 49448
UGC8837 (Holmberg IV) is a faint irregular dwarf galaxy located 1.3 degrees west of the spiral galaxy M101, which itself lies 5 degrees east of Mizar in Ursa Major. UGC8837 is one of M101's companion galaxies and spans just under 5 arcminutes from north to south. However, with a magnitude of 13.8, it is extremely faint, and the detailed internal structure of the galaxy is indistinct. Its distance from the Milky Way is estimated to be about 24 million light-years.



UGC7698
Superthin Galaxy(UGC9242)

Copyright(c) 2026 by Naoyuki Kurita, All rights reserved.
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