Andromeda IX (And 9) is a
dwarf spheroidal satellite
A satellite or artificial satellite is an object intentionally placed into orbit in outer space. Except for passive satellites, most satellites have an electricity generation system for equipment on board, such as solar panels or radioisotope ...
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, Σ
''V'' ≃ 26.8mags arcsec
−2 and the faintest galaxy known from its intrinsic absolute brightness.
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
*
List of Andromeda's satellite galaxies
The Andromeda Galaxy (M31) has satellite galaxies just like the Milky Way. Orbiting M31 are at least 13 dwarf galaxies: the brightest and largest is M110, which can be seen with a basic telescope. The second-brightest and closest one to M31 is ...
References
External links
SEDS webpage for Andromeda IX
{{DEFAULTSORT:Andromeda 09
Dwarf spheroidal galaxies
4689222
Local Group
Andromeda Subgroup
Andromeda (constellation)
Astronomical objects discovered in 2002