- Palomar 12
Globular cluster
name = Palomar 12
caption = Palomar 12 byHubble Space Telescope , 3.36′ view
epoch =J2000
class = XII
constellation =Capricornus
ra = RA|21|46|38.8cite web
title=SIMBAD Astronomical Database
work=Results for Palomar 12
url=http://simbad.u-strasbg.fr/Simbad
accessdate=2006-11-16]
dec = DEC|−21|15|03
dist_ly = 64 ± 3 kly
dist_pc = 19.5 ± 0.9 kpccite journal
author = A. Rosenberg, I. Saviane, G. Piotto, E. V. Held
title=Young Galactic globular clusters II. The case of Palomar 12
journal=Astronomy and Astrophysics
year=1998
volume=339
pages=61–69
url=http://adsabs.harvard.edu/abs/1998A&A...339...61R]
appmag_v = 11.99
size_v = 17′.4
radius_ly = 162 ± 8 ly [distance × sin( diameter_angle / 2 ) = 162 ly. radius]
mass_kg = -
mass_msol = -
v_hb = -
age = 6.5 Gyrcitation
last1 = Geisler
first1 = Doug
last2 = Wallerstein
first2 = George
last3 = Smith
first3 = Verne V.
last4 = Casetti-Dinescu
first4 = Dana I.
title = Chemical Abundances and Kinematics in Globular Clusters and Local Group Dwarf Galaxies and Their Implications for Formation Theories of the Galactic Halo
year = 2007
date = September 2007
journal = The Publications of the Astronomical Society of the Pacific
volume = 119
issue = 859
page = 939-961
url = http://adsabs.harvard.edu/abs/2007PASP..119..939G]
notes = -
names = GCl 123Palomar 12 is a
globular cluster in theconstellation Capricornus that belongs to the halo of theMilky Way galaxy. First discovered on the Palomar Survey Sky plates byRobert G. Harrington andFritz Zwicky , [cite journal
last=Abell
first = George O.
authorlink = George Ogden Abell
title=Globular Clusters and Planetary Nebulae Discovered on the National Geographic Society-Palomar Observatory Sky Survey
journal=Publications of the Astronomical Society of the Pacific
year=1955
volume=67
issue=397
pages=258
url=http://adsabs.harvard.edu/cgi-bin/bib_query?1955PASP...67..258A
doi=10.1086/126815] it was catalogued as a globular cluster. However Zwicky came to believe this was actually a nearby dwarf galaxy in theLocal Group . It is a relatively young cluster, being about 30% younger than most of the globular clusters in the Milky Way. It is metal-rich with ametallicity of [Fe/H] ~= -0.8. It has an average luminosity distribution of Mv = -4.48.citation
last1 = van den Bergh
first1 = Sidney
authorlink1 = Sidney van den Bergh
year = 2007
date = July 2007
title = The Luminosity Distribution of Globular Clusters in Dwarf Galaxies
journal = The Astronomical Journal
volume = 134
issue = 1
page = 344-345
url = http://adsabs.harvard.edu/abs/2007AJ....134..344V]Based on
proper motion studies, this cluster was first suspected in 2000 to have been captured from the Sagittarius dwarf galaxy about 1.7Gyr ago. [cite journal
author=D. I. Dinescu, S. R. Majewski, T. M. Girard, K. M. Cudworth
title=The Absolute Proper Motion of Palomar 12: A Case for Tidal Capture from the Sagittarius Dwarf Spheroidal Galaxy
journal=The Astronomical Journal
year=2000
volume=120
issue=4
pages=1892–1905
url=http://adsabs.harvard.edu/abs/2000astro.ph..6314D
doi=10.1086/301552] Its membership is now generally believed (Cohen 2004, Sbordone et al. 2006).References
External links
* [http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=Palomar+12 Simbad reference data]
* [http://www.seds.org/~spider/spider/MWGC/pal12.html SEDS: Palomar 12, Capricornus Dwarf]
*
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