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Cassiopeia Dwarf Galaxy

Andromeda VII, Cassiopeia Dwarf Spheroidal Galaxy,
Cas dSph, PGC 2807155

Dwarf Spheroidal Galaxy in Andromeda

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Proper NamesCassiopeia Dwarf Galaxy, Cassiopeia Dwarf Spheroidal Galaxy (abbreviated to Cas dSph)
Messier NumberNone
NGC/IC NumberNone
Other DesignationsAndromeda VII, PGC 5065047
Right Ascension23h 26m 32s
Declination+50° 40' 33"
Distancec.2,576,700 light years
c.790,000 parsecs
MagnitudeApparent: +13.64
Absolute: -10.93
Mean DiameterApparent: 2.5'
Actual: c.2,000 light years
Hubble TypedSph Dwarf Spheroidal
Optimum VisibilitySeptember / October (Usually visible from northern latitudes)
NotesThe Cassiopeia Dwarf Galaxy is one of a collection of small galaxies associated with the huge Andromeda Galaxy, M31 (hence its alternative designation of Andromeda VII). Despite being named for Cassiopeia, this galaxy actually lies just within Andromeda, some distance to the north and west of the Andromeda Galaxy itself, on the border where the constellation of Andromeda meets Cassiopeia to the north.

The Cassiopeia Dwarf Galaxy is barely visible even in this magnified image, but it can be seen as an extremely faint patch of light extending outward from the central reticle. Zooming in for a closer view will make the faint galaxy slightly easier to detect. Imagery provided by Aladin sky atlas


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