Rho2 Arietis

From Infogalactic: the planetary knowledge core
Jump to: navigation, search
For other star systems with this Bayer designation, see Rho Arietis.
Rho2 Arietis
Diagram showing star positions and boundaries of the Aries constellation and its surroundings
Cercle rouge 100%.svg

Location of ρ2 Arietis (circled)
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] (5.62–6.01)[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[1] mas
Distance 350 ± 10 ly
(108 ± 3 pc)
Details
Surface gravity (log g) 0.30[7] cgs
Temperature 3,250[7] K
Metallicity [Fe/H] –0.24[7] dex
Other designations
45 Arietis, RZ Arietis, AAVSO 0250+17, BD+17 457, HD 18191, HIP 13654, HR 867, SAO 93189.[8]

Rho2 Arietis is the Bayer designation for a 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. It is classified as a semiregular variable star with periods of 49.9 and 54.8 days,[9] while varying in visual magnitude between 5.62 and 6.01. This star is also known by its variable star designation, RZ Arietis.[3]

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 Lua error in Module:Citation/CS1/Identifiers at line 47: attempt to index field 'wikibase' (a nil value).
  2. 2.0 2.1 2.2 Lua error in Module:Citation/CS1/Identifiers at line 47: attempt to index field 'wikibase' (a nil value).
  3. 3.0 3.1 3.2 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.
  4. Lua error in Module:Citation/CS1/Identifiers at line 47: attempt to index field 'wikibase' (a nil value).
  5. HR 867, entry, Bright Star Catalogue, 5th Revised Ed., D. Hoffleit and W. H. Warren, Jr., 1991, CDS ID V/50.
  6. Lua error in Module:Citation/CS1/Identifiers at line 47: attempt to index field 'wikibase' (a nil value).
  7. 7.0 7.1 7.2 Lua error in Module:Citation/CS1/Identifiers at line 47: attempt to index field 'wikibase' (a nil value).
  8. "RZ Ari -- Semi-regular pulsating Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-08-08.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  9. Lua error in Module:Citation/CS1/Identifiers at line 47: attempt to index field 'wikibase' (a nil value).

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