出典:Wikipedia
出典:『Wikipedia』 (2011/03/14 11:14 UTC 版)
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). 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.