RS Persei

RS Persei
	; RS Persei is the red star closest to the centre of NGC 884, the right hand cluster (north is down).
Observation data; Epoch J2000 Equinox J2000
Constellation	Perseus
Right ascension	2h 22m 24.288s
Declination	+57° 0.6′ 34.08″
Apparent magnitude (V)	7.82-10.0
Characteristics
Spectral type	M4Iab
Variable type	SRc
Astrometry
Radial velocity (Rv)	−38.0±2 km/s
Proper motion (μ)	RA: −0.371±0.137 mas/yr ; Dec.: −0.931±0.165 mas/yr
Parallax (π)	0.6437 ± 0.0822 mas
Distance	2,345±55 pc
Absolute magnitude (MV)	−6.18
Details
Mass	12-15 M☉
Radius	770±30 R☉
Luminosity	77,600+9,500; −8,400 L☉
Surface gravity (log g)	−0.2±0.05 cgs
Temperature	3,470±90 K
Other designations
	RS Per, HD 14488, BD +56°583, 2MASS J02222428+5706340, AAVSO 0215+56A
Database references
SIMBAD	data

RS Persei is a red supergiant variable star located in the Double Cluster in Perseus.

Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...

Observation data Epoch J2000 Equinox J2000
RS Persei is the red star closest to the centre of NGC 884, the right hand cluster (north is down).
Constellation	Perseus
Right ascension	2^h 22^m 24.288^s^[1]
Declination	+57° 0.6′ 34.08″^[1]
Apparent magnitude (V)	7.82-10.0^[2]
Characteristics
Spectral type	M4Iab^[3]
Variable type	SRc^[2]
Astrometry

Radial velocity (R_v)	−38.0±2^[4] km/s
Proper motion (μ)	RA: −0.371±0.137^[5] mas/yr Dec.: −0.931±0.165^[5] mas/yr
Parallax (π)	0.6437 ± 0.0822^[5] mas
Distance	2,345±55^[6] pc
Absolute magnitude (M_V)	−6.18^[7]

Details^[6]

Mass	12-15 `M`_☉
Radius	770±30 `R`_☉
Luminosity	77,600+9,500 −8,400 `L`_☉
Surface gravity (log g)	−0.2±0.05 cgs
Temperature	3,470±90 K

Other designations
RS Per, HD 14488, BD +56°583, 2MASS J02222428+5706340, AAVSO 0215+56A
Database references
SIMBAD	data

References