| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Aries[1] |
| Right ascension | 02h 54m 55.205s[2] |
| Declination | +17° 44′ 05.08″[2] |
| Apparent magnitude (V) | 7.01[3] |
| Characteristics | |
| Spectral type | A5 V[4] |
| U−Bcolor index | +0.03[5] |
| B−Vcolor index | +0.28[5] |
| Astrometry | |
| Radial velocity (Rv) | +3.2±3.6[3] km/s |
| Proper motion (μ) | RA: +28.985mas/yr[6] Dec.: −15.890mas/yr[6] |
| Parallax (π) | 12.5263±0.1441 mas[6] |
| Distance | 260 ± 3 ly (79.8 ± 0.9 pc) |
| Absolute magnitude (MV) | +2.43[1] |
| Details | |
| Mass | 1.65±0.28[7] M☉ |
| Radius | 1.76±0.06[7] R☉ |
| Luminosity | 7.86±0.29[7] L☉ |
| Surface gravity (log g) | 4.17±0.08[7] cgs |
| Temperature | 7,289±126[7] K |
| Other designations | |
| Rho1 Ari,44 Arietis,BD+17°454,GC 3492,HD 18091,HIP 13579,SAO 93178,PPM 118656,TIC 257918546[8] | |
| Database references | |
| SIMBAD | data |
Rho1 Arietis is astar in the northernconstellation ofAries, the ram. Its name is aBayer designation that isLatinized from ρ1 Arietis, and abbreviated Rho1 Ari or ρ1 Ari. This star has anapparent visual magnitude of 7.01,[3] making it a challenge to see with thenaked eye even underideal dark-sky conditions. Based upon an annualparallax shift measurement of12.53 mas,[6] it is approximately 260light-years (80parsecs) distant from the Earth.
This is a white-huedA-type main-sequence star with astellar classification of A5 V.[4] It has 1.7 times the mass of the Sun and 1.8 times the Sun's radius. The star is radiating nearly 8 times the luminosity of the Sun from itsphotosphere at aneffective temperature of 7,289 K.[7]
