Palomar 1

Palomar 1 is a globular cluster, part of the Palomar group in the constellation Cepheus in the halo possibly in the Outer Arm of the Milky Way galaxy. First discovered by George O. Abell in 1954 on the Palomar Survey Sky plates,^[5] it was catalogued as a globular cluster.

Palomar 1
Palomar 1 by Hubble Space Telescope; 3.3′ view
Observation data (J2000 epoch)
Class	XII
Constellation	Cepheus
Right ascension	03h 33m 20.04s[1]
Declination	+79° 34′ 51.8″[1]
Distance	36.5 ± 4.2 kly (11,200 ± 1,300 pc)[2]
Apparent magnitude (V)	+13.18
Apparent dimensions (V)	2.8′
Physical characteristics
Radius	15 ly[3]
Estimated age	6.3 to 8 Gyr[2]
Notable features	–
Other designations	LEDA 13165[4]
See also: Globular cluster, List of globular clusters

At 6.3 to 8 Gyr, it is a very young cluster when compared to the other globular clusters in the Milky Way.^[2] It is a relatively metal-poor globular with [Fe/H] = −0.60.^[6] 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.^[6]