Sagittarius Dwarf Irregular Galaxy
Coordinates: 
19h 29m 59.0s, −17° 40′ 41″
19h 29m 59.0s, −17° 40′ 41″| SagDIG | |
|---|---|
Dwarf irregular galaxy) | |
| Apparent size (V) | 2.9′ × 2.1′[1] |
| Other designations | |
| Sagittarius Dwarf Irregular,[1] SGR Dwarf,[1] ESO594-G004,[1] PGC 63287,[1] Kowal's Object[1] | |
The Sagittarius Dwarf Irregular Galaxy (SagDIG) is a dwarf galaxy in the constellation of Sagittarius. (SagDIG should not be confused with the Sagittarius Dwarf Spheroidal Galaxy, SagDEG, a satellite galaxy of the Milky Way discovered decades later in the same constellation.) It lies about 3.4 million light-years away. It was discovered by Cesarsky et al. on a photographic plate taken for the ESO (B) Atlas on 13 June 1977 using the ESO 1 meter Schmidt telescope.
The SagDIG is thought to be the member of the
barycenter. It is only slightly outside the zero-velocity surface of the Local Group.[4]
SagDIG is a much more luminous galaxy than the
metal-poor (at least [Fe/H] ≤ −1.3). Further, the population is young, with the most likely average age between 4 and 8 billion years for the dominant population.[6]
References
External links
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- The Sagittarius Dwarf Irregular Galaxy on