MB 3
title: "MB 3" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["dwarf-galaxies", "ic-342/maffei-group", "astronomical-objects-discovered-in-1997", "principal-galaxies-catalogue-objects", "cassiopeia-(constellation)"] topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/MB_3" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::data[format=table title="Infobox galaxy"]
| Field | Value |
|---|---|
| name | MB 3 |
| image | MB 3 unWISE.png |
| epoch | J2000 |
| type | dSph |
| ra | |
| dec | |
| dist_ly | |
| appmag_v | 17.33 (V-band) |
| group_cluster | IC 342/Maffei |
| size_v | ~ 1.9′ |
| constellation name | Cassiopeia |
| notes | Companion of Dwingeloo 1 |
| names | 2MASX J02554290+5851394, KK98-021, |
| PGC 166069 | |
| :: |
| name = MB 3
| image = MB 3 unWISE.png
| epoch = J2000
| type = dSph
| ra =
| dec =
| dist_ly = 10 Mly ( 3 Mpc)
| appmag_v = 17.33 (V-band)
| group_cluster = IC 342/Maffei
| size_v = ~ 1.9′
| constellation name = Cassiopeia
| notes = Companion of Dwingeloo 1
| names = 2MASX J02554290+5851394, KK98-021,
PGC 166069
MB 3 is a dwarf spheroidal galaxy discovered in 1997 and located about 10 million light-years away from the Earth. It was discovered during an optical survey of the IC 342/Maffei group to which the galaxy is a member. MB3 is a companion galaxy of Dwingeloo 1 and situated in the Zone of Avoidance. MB 3 is thought to be a member of the IC 342/Maffei Group, a galaxy group adjacent to the Local Group.
The visible diameter of MB 3 is approximately 1.9′, which at the distance of 3 Mpc corresponds to about 2 kpc. In optical images it appears as a highly flattened diffuse oval located approximately 9.2′ to the southwest of Dwingeloo 1. No neutral or molecular hydrogen has been detected in it, which is consistent with its classification as a dwarf spheroidal galaxy.
References
References
- (2005). "The Local Group and Other Neighboring Galaxy Groups". The Astronomical Journal.
- (1997). "Discovery of a Second Companion of Dwingeloo 1". The Astronomical Journal.
- (1999). "The IC 342/Maffei Group Revealed". The Astrophysical Journal Supplement Series.
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