| Andromeda XIX | |
|---|---|
| Observation data (J2000epoch) | |
| Constellation | Andromeda |
| Right ascension | 00h 19m 32.10s[1] |
| Declination | +35° 02′ 37.1″[1] |
| Redshift | 0.003903[1] |
| Distance | 2,651 kly (812.8 kpc)[2] |
| Apparent magnitude (V) | −10.1[2] |
| Absolute magnitude (V) | 14.5[2] |
| Characteristics | |
| Type | dG |
| Half-light radius (physical) | 1700pc |
| Notable features | Satellite ofAndromeda Galaxy, extremely diffuse |
| Other designations | |
| And XIX,LEDA 5056919[1] | |
Andromeda XIX is asatellite galaxy of theAndromeda Galaxy (M31), a member of theLocal Group, like theMilky Way Galaxy.[3] Andromeda XIX is considered "the most extendeddwarf galaxy known in the Local Group",[4] and has been shown to have a half-lightradius of 1.7kiloparsec (kpc).[4] It was discovered by theCanada–France–Hawaii Telescope, and is thought to be a dwarf galaxy.
As with other dwarf galaxies, Andromeda XIX is not producing new stars: 90% of its star formation occurred over 9 billion years ago. However, compared to dwarf galaxies of similar mass Andromeda XIX is extremely diffuse, likeAntlia II.[2]
Surveillance was performed during use of the MegaPrime/MegaCam 1 deg2 (camera) on the Canada-France-Hawaii Telescope (CFHT) had mapped the Andromeda Galaxy's stellar halo (one quarter) up to ~150 kpc.[5] The survey confirmed the clumpiness of Andromeda's stellar halo. It had shown the existence of multiple other dwarf galaxies.[5] They include:AndromedaXI, XII, XIII, XV, XVI,XVIII, XIX, and XX.[5]
| Location | Andromeda Galaxy → Andromeda subgroup →Local Group →Local Sheet →Local Volume →Virgo Supercluster →Laniakea Supercluster →Pisces–Cetus Supercluster Complex →Local Hole →Observable universe →Universe Each → may be read as "within" or "part of". | .jpg) |
|---|---|---|
| Satellite galaxies |
*It is uncertain whether these are companion galaxies of the Andromeda Galaxy | |
| Catalogued stars | ||
| Other | ||
