Rho2 Arietis
Star in the constellation Aries / From Wikipedia, the free encyclopedia
Rho2 Arietis is an M-type red giant star in the northern constellation of Aries. With an annual parallax shift of 9.28 mas,[1] it is approximately 350 light-years (110 parsecs) distant from the Earth.
For other stars with this Bayer designation, see ρ Arietis.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Aries |
Right ascension | 02h 55m 48.49800s[1] |
Declination | +18° 19′ 53.9029″[1] |
Apparent magnitude (V) | 5.93[2] (5.45–6.01)[3] |
Characteristics | |
Spectral type | M6 III[4] |
U−B color index | +1.12[2] |
B−V color index | +1.51[2] |
R−I color index | 2.17[5] |
Variable type | SRb[3] |
Astrometry | |
Radial velocity (Rv) | +46.0[6] km/s |
Proper motion (μ) | RA: −7.78[1] mas/yr Dec.: −14.98[1] mas/yr |
Parallax (π) | 9.28 ± 0.30 mas[1] |
Distance | 350 ± 10 ly (108 ± 3 pc) |
Absolute magnitude (MV) | +0.60[7] |
Details | |
Mass | 1.14±0.2[8] M☉ |
Luminosity | 1,995[9] L☉ |
Surface gravity (log g) | 0.30[10] cgs |
Temperature | 3,341[8] K |
Metallicity [Fe/H] | –0.24[10] dex |
Other designations | |
Database references | |
SIMBAD | data |
Close
Rho2 Arietis is classified as a semiregular variable star with periods of 49.9 and 54.8 days.[12] It varies in visual magnitude between 5.45 and 6.01. It has the variable star designation, RZ Arietis.[3] It is generally considered to be an asymptotic giant branch star, having exhausted its core helium.[13] Based on comparison of its current temperature and luminosity with theoretical evolutionary tracks, its initial mass is estimated to have been 1.3 M☉ and its mass now is 1.14 M☉.[8]