V355 Cephei

V355 Cephei is a red supergiant located in the constellation of Cepheus. It has a radius between 770±154^[5] and 790^[6] solar radii, making it one of the largest known stars. It is a slow irregular variable with an apparent magnitude that ranges between 10.55 - 11.4.^[4]

ConstellationCepheus^[2]

Right ascension22^h 49^m 10.47^s[3]

Declination+59° 18′ 13.0″^[3]

Apparentmagnitude(V)10.55 - 11.4^[4]

Quick facts Constellation, Right ascension ...

V355 Cephei

Light curve for V355 Cephei plotted from ASAS-SN data[1]
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Cepheus[2]
Right ascension	22h 49m 10.47s[3]
Declination	+59° 18′ 13.0″[3]
Apparent magnitude (V)	10.55 - 11.4[4]
Characteristics
Spectral type	M2Iab[4]
Variable type	LC[4]
Astrometry
Radial velocity (Rv)	−64.29±0.61[3] km/s
Proper motion (μ)	RA: −3.158[3] mas/yr Dec.: −2.017[3] mas/yr
Parallax (π)	0.2244±0.0289 mas[3]
Distance	approx. 15,000 ly (approx. 4,500 pc)
Absolute magnitude (MV)	−6.1[5]
Details
Radius	770±154[5] – 790[6] R☉
Luminosity	106,000[6] L☉
Surface gravity (log g)	−0.1[5] cgs
Temperature	3,660[6] K
Other designations
IRC +60367, V355 Cep, 2MASS J22491046+5918129
Database references
SIMBAD	data

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