SS Cephei

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

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.

Quick Facts Constellation, Right ascension ...

Observation data Epoch J2000 Equinox J2000
SS Cephei, as seen during the Sloan Digital Sky Survey
Constellation	Cepheus^[1]
Right ascension	03^h 49^m 30.0153^s^[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 (R_v)	−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 (M_V)	+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

See also