Rho² Arietis

For other star systems with this Bayer designation, see Rho Arietis.
ρ2 Arietis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Aries
Right ascension 02h 55m 48.4978s[1]
Declination +18° 19′ 53.903″[1]
Apparent magnitude (V) 5.62–6.01[2]
Characteristics
Spectral type M6III[1]
U−B color index 1.12[3]
B−V color index 1.47[3]
R−I color index 2.17[3]
Variable type SRB[2]
Astrometry
Radial velocity (Rv) 46.0[1] km/s
Proper motion (μ) RA: −8.08[1] mas/yr
Dec.: −14.91[1] mas/yr
Parallax (π) 8.08 ± 0.89[1] mas
Distance approx. 400 ly
(approx. 120 pc)
Details
Temperature 3442 ± 148[4] K
Database references
SIMBAD data
Other designations
45 Arietis, RZ Arietis, AAVSO 0250+17, BD+17°457, DO 9631, GC 3517, HD 18191, HIP 13654, HR 867, PPM 118672, SAO 93189.[1]

Rho2 Arietis is a M-type red giant with an apparent magnitude which varies between 5.62 and 6.01.[2] It is approximately 400 light years from Earth.[1] It is classified as a semiregular variable star and its brightness varies with a period of 30 days. It is also known by its variable star designation, RZ Arietis.[2]


References

  1. ^ a b c d e f g h i V* RZ Ari -- Variable Star, database entry, SIMBAD. Accessed on line July 30, 2008.
  2. ^ a b c d V* RZ Ari, entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al., CDS ID II/250.
  3. ^ a b c HR 867, entry, Bright Star Catalogue, 5th Revised Ed., D. Hoffleit and W. H. Warren, Jr., 1991, CDS ID V/50.
  4. ^ Table 2, Radii and effective temperatures for K and M giants and supergiants. II, H. M. Dyck, G. T. van Belle, and R. R. Thompson, The Astronomical Journal 116 (August 1998), pp. 981–986, Bibcode: 1998AJ....116..981V, doi:10.1086/300453.

External links

Coordinates: 02h 55m 48.4978s, +18° 19′ 53.903″

Stars of Aries
Bayer
Flamsteed
Nearby