Palomar 12
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Palomar 12 is a globular cluster in the constellation Capricornus that belongs to the halo of the Milky Way Galaxy.
First discovered on the National Geographic Society – Palomar Observatory Sky Survey plates by Robert George Harrington and Fritz Zwicky,[7] it was catalogued as a globular cluster. However Zwicky came to believe this was actually a nearby dwarf galaxy in the Local Group. It is a relatively young cluster, being about 30% younger than most of the globular clusters in the Milky Way.[2] It is metal-rich with a metallicity of [Fe/H] ~= -0.8.[5] It has an average luminosity distribution of Mv = -4.48.[8]
Based on proper motion studies, this cluster was first suspected in 2000 to have been captured from the Sagittarius dwarf galaxy about 1.7 Ga ago.[9] It is now generally believed to be a member of the Sagittarius dwarf galaxy (Cohen 2004, Sbordone et al. 2006).[5] It is estimated to be 6.5 Gyr old.[5]
References
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<references />, or <references group="..." />External links
- Simbad reference data
- SEDS: Palomar 12, Capricornus Dwarf
- Palomar 12 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
21h 46m 38.84s, −21° 15′ 09.4″
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Milky Way → Milky Way subgroup → Local Group → Virgo Supercluster → Laniakea Supercluster → Observable universe → Universe
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- ↑ distance × sin( diameter_angle / 2 ) = 162 ly. radius
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