Dwarf Spheroidal Galaxy Andromeda I (PGC 2666), type dE3 pec ?,
Andromeda 1, or And I, is a dwarf spheroidal galaxy, and a companion of the
Andromeda Galaxy M31, situated roughly 3.5 degrees
south and slightly east of the great neighbor, corresponding to a projected
distance of about 150,000 ly. From us, it is slightly more distant than the
great galaxy, according to van den Bergh 2000.
- 00 : 45.7
- +38 : 00
- dE3 pec ?
- 3000 kly
- Apparent Dimension:
- 2.5 x 2.5 arc min
- Abs. Mag:
And I was discovered by Sidney van der Bergh on photographic plates taken in
1970 and 1971 with the Palomar 48-inch (1.2-meter) Schmidt telescope, together
with And II, And III, and the
presumable non- or background galaxy And IV
(van den Bergh 1972).
In 2000, Grebel et.al. discovered a globular cluster in And I in the
HST image archives (Grebel et.al. 2000).
Our image was obtained by
Martin Germano. It is a 125-min exposure on hypered Kodak Tech Pan 2415,
taken through his 14.5-inch f/5 Newtonian telescope in September 2001.
Martin writes: "This dwarf elliptical Galaxy in Andromeda is really faint!
Just a small scattering of faint dots near the center of this image."
- Eva K. Grebel, A.E. Dolphin, P. Guhathakurta, 2000.
Discovery of a Globular Cluster in M31's Dwarf Spheroidal Companion
Astronomische Gesellschaft Abstract Series, Vol. 17. Abstracts of
Contributed Talks and Posters presented at the Annual Scientific Meeting of
the Astronomische Gesellschaft at Bremen, September 18-23, 2000.
- Sidney van den Bergh, 1972.
Search for Faint Companions to M31.
Astrophysical Journal, vol. 171, pp. L31-L33
- Sidney van den Bergh, 2000.
Updated Information on the Local Group.
Publications of the Astronomical Society of the Pacific, Vol. 112, No. 770,
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Last Modification: July 25, 2001