AR Cephei

AR Cephei, as seen during the Digitized Sky Survey
Object type	Semiregular variable star
Other designations	DO 42253, FK5 6018, GCRV 27213, GSC 04654-00911, HD 217158, HIC 112882, HIP 112882, IRAS 22526+8446, 2MASS J22513374+8502469, PPM 4030, RAFGL 2988, SAO 3809, AG+84 497, BD+84 516, Gaia DR2 2300884800184802816, AR Cep, AAVSO 2253+84, GC 31962, TYC 4654-911-1, TIC 461522596, Gaia DR3 2300884800185315712
Observation data (Epoch J2000)
Constellation	Cepheus
Right ascension	22h 51m 33.68
Declination	+85° 02` 46.9
Distance	~1,114 ly
In visual light (V)
Apparent magnitude	+7.3
Temperature	2,400 - 3,700 K
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AR Cephei (AR Cep) is a variable star in the constellation Cepheus. It is classified as a semiregular star,^[1][2] and has a maximum apparent magnitude of +7.32.

AR Cephei is located approximately 1,114 light-years (350 parsecs) from the Solar System, and has a radial velocity of -14.58000 ± 0.48 km/s, meaning that it is moving toward the Sun at ~14 kilometers every second.^{[citation needed]}

Aernout de Sitter discovered the star in 1933.^[4][5] It was given its variable star designation, AR Cephei, in 1939.^[5]

• List of variable stars
• T Cephei