Palomar 1 is a
globular cluster
A globular cluster is a spheroidal conglomeration of stars that is bound together by gravity, with a higher concentration of stars towards its center. It can contain anywhere from tens of thousands to many millions of member stars, all orbiting ...
, part of the
Palomar group in the
constellation
A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object.
The first constellati ...
Cepheus
Cepheus (Ancient Greek: Κηφεύς ''Kepheús'') may refer to:
In Greek mythology
* Cepheus (father of Andromeda), and King of Aethiopia
* Cepheus (son of Aleus), a king of Tegea, Arcadia
In astronomy
* Cepheus (constellation), one of the 88 m ...
in the
halo possibly in the
Outer Arm of the
Milky Way
The Milky Way or Milky Way Galaxy is the galaxy that includes the Solar System, with the name describing the #Appearance, galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars in other arms of the galax ...
galaxy. First discovered by
George O. Abell
George Ogden Abell (March 27, 1927 – October 7, 1983) was an American astronomer and professor. He taught at UCLA, primarily as a research astronomer. He earned his B.S. in 1951, his M.S. in 1952 and his Ph.D. in 1957, all from Caltech. He was ...
in 1954 on the Palomar Survey Sky plates,
it was catalogued as a globular cluster.
At 6.3 to 8 Gyr, it is a very young cluster when compared to the other globular clusters in the Milky Way.
It is a relatively
metal-poor
In astronomy, metallicity is the abundance of elements present in an object that are heavier than hydrogen and helium. Most of the normal currently detectable (i.e. non-dark) matter in the universe is either hydrogen or helium, and astronomers ...
globular with
e/H= −0.60.
It is likely that Palomar 1 has a similar evolutionary history to the
Sagittarius dwarf companion globular
Terzan 7
Terzan 7 is a sparse and young globular cluster that is believed to have originated in the Sagittarius Dwarf Spheroidal Galaxy (Sag DEG) and is physically associated with it. It is relatively metal rich with and an estimated age of 7.5 Gyr ...
, that is, it may have once been associated
with a
dwarf spheroidal galaxy
A dwarf spheroidal galaxy (dSph) is a term in astronomy applied to small, low-luminosity galaxies with very little dust and an older stellar population. They are found in the Local Group as companions to the Milky Way and as systems that are c ...
that was later destroyed by tidal forces.
References
External links
*
SEDS: Palomar 1*
Cepheus (constellation)
Globular clusters
Astronomical objects discovered in 1954
•
In typography, a bullet or bullet point, , is a typographical symbol or glyph used to introduce items in a list. For example:
* Monica
* Erica
* Rita
* Tina
* Sandra
* Mary
* Jessica
The bullet symbol may take any of a variety of shapes, s ...
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