Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aries |
Right ascension | 03h 08m 21.10890s[2] |
Declination | +18° 47′ 42.1886″[2] |
Apparent magnitude (V) | 6.27[3] |
Characteristics | |
Evolutionary stage | AGB[4] |
Spectral type | M0 III[5] |
B−V color index | 1.560±0.014[6] |
Astrometry | |
Radial velocity (Rv) | +44.32±0.22[2] km/s |
Proper motion (μ) | RA: +38.133[2] mas/yr Dec.: −14.295[2] mas/yr |
Parallax (π) | 4.3947 ± 0.1037 mas[2] |
Distance | 740 ± 20 ly (228 ± 5 pc) |
Absolute magnitude (MV) | −0.54[6] |
Details | |
Radius | 40.7+3.0 −2.6[2] R☉ |
Luminosity | 387±11[2] L☉ |
Temperature | 4013+137 −141[2] K |
Other designations | |
Database references | |
SIMBAD | data |
54 Arietis is a star in the northern zodiac constellation of Aries. 54 Arietis is the Flamsteed designation. It is a challenge to view with the naked eye even under good viewing conditions, having an apparent visual magnitude of 6.27.[3] Based upon an annual parallax shift of 4.39 mas, it is located approximately 740 light-years (230 parsecs) distant from Earth, and it is drifting further away with a radial velocity of +44 km/s.[2] The brightness of the star is diminished by 0.15[8] in magnitude from extinction caused by interstellar gas and dust. The star is positioned near the ecliptic and thus is subject to lunar occultations.[9]
This is an aging red giant star with a stellar classification of M0 III[5] that is currently evolving along the asymptotic giant branch.[4] Having exhausted the supply of hydrogen at its core, the star has expanded to 41[2] times the Sun's radius. It varies slightly in brightness, with a periodicity of 6.2 days and an amplitude change of 0.0096 in magnitude.[5] On average it is radiating 387[2] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,013 K.[2]
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