R Equulei

R Equulei
	; The visual band light curve of R Equulei, from AAVSO data
Observation data; Epoch J2000 Equinox J2000
Constellation	Equuleus
Right ascension	21h 13m 11.49118s
Declination	12° 48′ 06.1620″
Apparent magnitude (V)	8.7 - 15.0
Characteristics
Spectral type	M3e - M4e
B−V color index	+1.41
Variable type	Mira
Astrometry
Radial velocity (Rv)	−54±5 km/s
Proper motion (μ)	RA: −2.713 mas/yr ; Dec.: −11.232 mas/yr
Parallax (π)	0.4329±0.0437 mas
Distance	approx. 7,500 ly ; (approx. 2,300 pc)
Details
Mass	3.42 M☉
Luminosity	33,791 L☉
Surface gravity (log g)	−0.007 cgs
Temperature	3,395 K
Metallicity [Fe/H]	−0.13 dex
Other designations
	R Equ, BD+12°4573a, HD 202051, PPM 139768
Database references
SIMBAD	data

R Equulei is a class M Mira variable star in the constellation Equuleus. Its brightness varies between a minimum magnitude of 15.0 to a maximum of 8.7 with an average period of 261 days.^[3]

Right ascension21^h 13^m 11.49118^s^[2]

Declination12° 48′ 06.1620″^[2]

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

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Observation data Epoch J2000 Equinox J2000
The visual band light curve of R Equulei, from AAVSO data^[1]
Constellation	Equuleus
Right ascension	21^h 13^m 11.49118^s^[2]
Declination	12° 48′ 06.1620″^[2]
Apparent magnitude (V)	8.7 - 15.0^[3]
Characteristics
Spectral type	M3e - M4e^[3]
B−V color index	+1.41^[4]
Variable type	Mira^[3]
Astrometry

Radial velocity (R_v)	−54±5^[5] km/s
Proper motion (μ)	RA: −2.713^[2] mas/yr Dec.: −11.232^[2] mas/yr
Parallax (π)	0.4329±0.0437 mas^[2]
Distance	approx. 7,500 ly (approx. 2,300 pc)

Details

Mass	3.42^[6] `M`_☉
Luminosity	33,791^[7] `L`_☉
Surface gravity (log g)	−0.007^[6] cgs
Temperature	3,395^[6] K
Metallicity [Fe/H]	−0.13^[6] dex

Other designations
R Equ, BD+12°4573a, HD 202051, PPM 139768^[8]
Database references
SIMBAD	data

References