Andromeda X

Not to be confused with Chi Andromedae or 10 Andromedae.

Andromeda X (And 10) is a dwarf spheroidal galaxy about 2.9 million light-years away from the Sun in the constellation Andromeda.^[1] Discovered in 2005 by Zucker et al., And X is a satellite galaxy of the Andromeda Galaxy (M31). Aided by the application of stellar photometry to data from the Sloan Digital Sky Survey similar to the Andromeda IX discovery, the new finding indicates that this type of extremely faint satellite might be common in the Local Group, potentially providing further support for hierarchical cold dark matter models.^[2]

Andromeda X
Observation data (J2000 epoch)
Constellation	Andromeda
Right ascension	01h 06m 33.9s
Declination	+44° 48′ 16″
Apparent magnitude (V)	16.1
Absolute magnitude (V)	-8.1
Characteristics
Type	dSph
Apparent size (V)	7 arcmin
Notable features	satellite galaxy of the Andromeda Galaxy
Other designations
And X, PGC 5056921

See also

• Astronomy portal

• List of Andromeda's satellite galaxies