Andromeda IX

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Andromeda IX
Observation data (J2000 epoch)
Right ascension00h 52m 53.0s[1]
Declination+43° 11′ 45″[1]
Redshift-216 ± ? km/s[1]
Distance2.50 ± 0.08 Mly (766 ± 25 kpc)[2]
Notable featuresSatellite galaxy
Other designations
And IX, PGC 4689222[3]
See also: Galaxy, List of galaxies

Andromeda IX (And 9) is a dwarf spheroidal satellite of the Andromeda Galaxy. It was discovered in 2004 by resolved stellar photometry from the Sloan Digital Sky Survey (SDSS), by Zucker et al. (2004).[2] At the time of its discovery, it was the galaxy with the lowest known surface brightness, ΣV ≃ 26.8mags arcsec−2 and the faintest galaxy known from its intrinsic absolute brightness.[2]

It was found from data acquired within an SDSS scan along the major axis of M31, on October 5, 2002. Its distance was estimated to be almost exactly the same as that of M31 by McConnacrchie et al. (2005).

See also[edit]


  1. 1.0 1.1 1.2 1.3 Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
  2. 2.0 2.1 2.2 McConnachie, A. W.; Irwin, M. J.; Ferguson, A. M. N.; Ibata, R. A.; Lewis, G. F.; Tanvir, N. (2005). "Distances and metallicities for 17 Local Group galaxies". Monthly Notices of the Royal Astronomical Society 356 (4): 979–997. arXiv:astro-ph/0410489. Bibcode 2005MNRAS.356..979M. doi:10.1111/j.1365-2966.2004.08514.x.
  3. Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).

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