Rho1 Arietis

Rho¹ Arietis is a star in the northern constellation of Aries, the ram. Its name is a Bayer designation that is Latinized from ρ¹ Arietis, and abbreviated Rho¹ Ari or ρ¹ Ari. This star has an apparent visual magnitude of 7.01,^[3] making it a challenge to see with the naked eye even under ideal dark-sky conditions. Based upon an annual parallax shift measurement of 12.53 mas,^[6] it is approximately 260 light-years (80 parsecs) distant from the Earth.

For other stars with this Bayer designation, see ρ Arietis.

Rho¹ Arietis

Observation data Epoch J2000.0      Equinox J2000.0 (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−B color index	+0.03[5]
B−V color index	+0.28[5]
Astrometry
Radial velocity (Rv)	+3.2±3.6[3] km/s
Proper motion (μ)	RA: +28.985 mas/yr[6] Dec.: −15.890 mas/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

This is a white-hued A-type main-sequence star with a stellar 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 its photosphere at an effective temperature of 7,289 K.^[7]