SS Cephei

SS Cephei is a semiregular variable star in the constellation Cepheus. It is of spectral type M5III, and has an estimated temperature of about 3,700 K. The star is about 830 light-years (260 parsecs) from Earth. The brightness of SS Cephei varies between magnitude 6.9 and 7.9.

ConstellationCepheus^[1]

Right ascension03^h 49^m 30.0153^s[2]

Declination+80° 19′ 20.902″^[2]

Apparentmagnitude(V)6.9 - 7.9^[3]

Quick facts Constellation, Right ascension ...

SS Cephei

SS Cephei, as seen during the Sloan Digital Sky Survey
Observation data Epoch J2000      Equinox J2000
Constellation	Cepheus[1]
Right ascension	03h 49m 30.0153s[2]
Declination	+80° 19′ 20.902″[2]
Apparent magnitude (V)	6.9 - 7.9[3]
Characteristics
Evolutionary stage	AGB[4]
Spectral type	M5III[5]
Variable type	SRb[3]
Astrometry
Radial velocity (Rv)	−46.87±0.09[6] km/s
Proper motion (μ)	RA: −4.911[2] mas/yr Dec.: 12.062[2] mas/yr
Parallax (π)	3.9187±0.1886 mas[2]
Distance	830 ± 40 ly (260 ± 10 pc)
Absolute magnitude (MV)	+0.13[5]
Details
Mass	3.7[7] M☉
Radius	239[8] R☉
Luminosity	5,021[8] L☉
Surface gravity (log g)	2.33[7] cgs
Temperature	3,830[7] K
Metallicity [Fe/H]	−0.32[7] dex
Other designations
BD+79°110, HD 22689, HIP 17881, SAO 594[9]
Database references
SIMBAD	data

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