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Palomar 5

Globular cluster in the constellation Serpens

Field	Value
name	Palomar 5
image	Pal5_-_SDSS_DR14_(panorama).jpg
epoch	J2000
class	XII
constellation	Serpens
ra	{{cite web
title	SIMBAD Astronomical Database
work	Results for Palomar 5
url	http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Palomar+5&submit=SIMBAD+search
access-date	2006-11-17}}
dec
dist_ly	76 kly
appmag_v	+11.75
size_v	6.9
radius_ly	76 ly
mass_msol
age	Gyr{{cite journal
author	Martell, S. L.
author2	Smith, G. H.
author3	Grillmair, C. J.
title	A New Age Measurement for Palomar 5
journal	American Astronomical Society, 201st AAS Meeting, #07.11; Bulletin of the American Astronomical Society
volume	34
date	2002
pages	1103
bibcode	2002AAS...201.0711M
notes	Erroneously thought to be a dwarf galaxy
names	UGC 9792, GCl 32

| access-date=2006-11-17}}

Palomar 5 is a globular cluster in the constellation Serpens and a member of the Palomar Globular Clusters group. It was discovered by Walter Baade in 1950, and independently found again by Albert George Wilson in 1955. After the initial name of Serpens, it was subsequently catalogued as Palomar 5.

There is a process of disruption acting on this cluster because of the gravitation of the Milky Way – in fact there are many stars leaving this cluster in the form of a stellar stream. The stream has a mass of 5000 solar masses and is 30,000 light years long. The cluster is currently 60.6 kly from the Galactic Center. It shows a noticeable amount of flattening, with an aspect ratio of 0.62 ± 0.23 between its semimajor axis and semiminor axis.

References

distance × sin( diameter_angle / 2 ) = 76 ly. radius
Ibata, Rodrigo. (April 2007). "The Ghosts of Galaxies Past". Scientific American.
(November 2007). "A 1.4 GHz Arecibo Survey for Pulsars in Globular Clusters". The Astrophysical Journal.
(October 2010). "Morphological Distortion of Galactic Globular Clusters". The Astrophysical Journal.
(November 2011). "Young Radio Pulsars in Galactic Globular Clusters". The Astrophysical Journal.

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globular-clusters serpens ugc-objects stellar-streams

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