Palomar 1
Encyclopedia
Palomar 1 is a globular cluster
in the constellation
Cepheus
in the
halo or Outer Arm(?) of the Milky Way
galaxy. First discovered discovered by George O. Abell 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-rich globular with [Fe/H] = -0.60.
It is likely that Palomar 1 has a similar evolutionary history to the Sagittarius dwarf
companion globular Terzan 7
, that is, it may have once been associated
with a dwarf spheroidal galaxy
that was later destroyed by tidal forces.
Globular cluster
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite. Globular clusters are very tightly bound by gravity, which gives them their spherical shapes and relatively high stellar densities toward their centers. The name of this category of star cluster is...
in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Cepheus
Cepheus (constellation)
Cepheus is a constellation in the northern sky. It is named after Cepheus, King of Aethiopia in Greek mythology. It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations.-Stars:...
in the
halo or Outer Arm(?) of the Milky Way
Milky Way
The Milky Way is the galaxy that contains the Solar System. This name derives from its appearance as a dim un-resolved "milky" glowing band arching across the night sky...
galaxy. First discovered discovered by George O. Abell 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-rich globular with [Fe/H] = -0.60.
It is likely that Palomar 1 has a similar evolutionary history to the Sagittarius dwarf
Sagittarius Dwarf Elliptical Galaxy
The Sagittarius Dwarf Elliptical Galaxy is an elliptical loop-shaped satellite galaxy of the Milky Way Galaxy. It consists of four globular clusters, the main cluster being discovered in 1994...
companion globular Terzan 7
Terzan 7
Terzan 7 is a sparse and young globular cluster that is believed to have originated in the Sagittarius Dwarf Elliptical Galaxy and is physically associated with it. It is relatively metal rich with Fe/H] = -0.6 and an estimated age of 7.5 Gyr...
, that is, it may have once been associated
with a dwarf spheroidal galaxy
Dwarf spheroidal galaxy
Dwarf spheroidal galaxy is a term in astronomy applied to low luminosity galaxies that are companions to the Milky Way and to the similar systems that are companions to the Andromeda Galaxy M31...
that was later destroyed by tidal forces.