Cepheus OB1

Cepheus OB1 is an OB association around the cluster NGC 7380. The region is approximately 3,400 parsecs from Earth in the constellation of Cepheus, although many of its stars lie in neighboring constellations like Cassiopeia.

Cepheus OB1
NGC 7380 and Wizard nebula
Observation data (J2000.0 epoch)
Right ascension	22h 29m 00.0s[1]
Declination	+56° 36′ 00″[1]
Distance	3,400+220 −200 pc[2]
Physical characteristics
Radius	815[3]
Associations
Constellation	Cepheus
See also: Open cluster, List of open clusters

Cepheus OB1 contains dozens of O and B class stars, but the brightest members are cool supergiants and hypergiants such as V509 Cassiopeiae (HR 8752) and RW Cephei.^[4]

Prominent stars

Star	Spectral type	Notes
RW Cephei	K2 0-Ia	Variable, one of the largest stars known
V354 Cephei	M2.5 Iab / M3.5 Ib	Variable, one of the largest stars known
DH Cephei	O5.5 V / O6 V	Binary
HR 8752	G0 Ia-0	Yellow hypergiant
W Cephei	K0ep-M2ep Ia + B0/B1	Binary
U Lacertae	M4epIab + B	Spectroscopic binary
WR 152	WN3(h)	Wolf–Rayet star