Andromeda I

Andromeda I is a spheroidal dwarf galaxy ( dSph ) in the constellation of Andromeda. The galaxy is about 2.4 million light years away from our solar system. Andromeda I is a member of the Local Group, and is a satellite of the Andromeda Galaxy (M31 ).

Properties

The dwarf galaxy is roughly 3.5 degrees south and slightly east of the M31. It is thus for the year of 2005 kpc is located closest satellite galaxy of Andromeda, with an estimated projected distance of about 40 or 150,000 light years.

Andromeda I was discovered in 1970 by Sidney van den Bergh with the 1.2 m Oschin Schmidt telescope at Palomar Observatory. Further studies on Andromeda I have been with the Wide Field / Planetary Camera 2 of the Hubble Space Telescope.

This also found a mainly dominated by red giant horizontal branch as with other spheroidal dwarf galaxies. This and the additional determine the frequency of blue stars in the horizontal branch and the discovery of 99 RR Lyrae stars in 2005 was able to show you that Andromeda I went through an extended era of star formation estimated of about 10 billion years. The Hubble discovered beyond a globular cluster as a companion of the Andromeda I, making it the faintest galaxy with such satellites.

More

  • List of satellite galaxies of Andromeda
  • Andromeda Galaxy
Andromeda (constellation) Declination Radial velocity Light-year RR Lyrae variable 1,000,000,000 Digital Object Identifier arXiv Triangulum Galaxy Messier 32 Messier 110 NGC 185 NGC 147 Andromeda II Andromeda III Andromeda V Andromeda VIII Andromeda IX Andromeda X Andromeda XI
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