Palomar 12
| Palomar 12 | |
|---|---|
| 300px
Palomar 12 by Hubble Space Telescope, 3.36′ view
|
|
| Observation data (J2000 epoch) | |
| Class | XII |
| Constellation | Capricornus |
| Right ascension | 21h 46m 38.84s[1] |
| Declination | –21° 15′ 09.4″[1] |
| Distance | 63.6 ± 2.9 kly (19.50 ± 0.89 kpc)[2] |
| Apparent magnitude (V) | 11.99 |
| Apparent dimensions (V) | 17′.4 |
| Physical characteristics | |
| Mass | 1.59×104[3] M☉ |
| Radius | 162 ± 8 ly[4] |
| Metallicity | –0.85[3] dex |
| Estimated age | 6.5 Gyr[5] |
| Other designations | GCl 123[6] |
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
<templatestyles src="Reflist/styles.css" />
Cite error: Invalid <references> tag; parameter "group" is allowed only.
<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″
| Location |
Milky Way → Milky Way subgroup → Local Group → Virgo Supercluster → Laniakea Supercluster → Observable universe → Universe
Each arrow (→) may be read as "within" or "part of". |
 |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| Galactic core | |||||||||
| Spiral arms | |||||||||
| Satellite galaxies |
|
||||||||
| Related | |||||||||
<templatestyles src="Asbox/styles.css"></templatestyles>
 |
This star cluster–related article is a stub. You can help Wikipedia by expanding it. |
- ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ distance × sin( diameter_angle / 2 ) = 162 ly. radius
- ↑ 5.0 5.1 5.2 5.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
