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 |
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.
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]
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 |
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.
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]