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]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Equuleus |
Right ascension | 21h 13m 11.49118s[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 (Rv) | −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 | |
Database references | |
SIMBAD | data |