Rho Gruis

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Rho Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 22h 43m 29.97654s[1]
Declination −41° 24′ 51.6467″[1]
Apparent magnitude (V) 4.847[2]
Spectral type K0 III[3]
U−B color index +0.807[4]
B−V color index +1.026[4]
Proper motion (μ) RA: +10.11[1] mas/yr
Dec.: −93.79[1] mas/yr
Parallax (π) 14.16 ± 0.19[1] mas
Distance 230 ± 3 ly
(70.6 ± 0.9 pc)
Absolute magnitude (MV) 0.685[2]
Mass 1.91[2] M
Surface gravity (log g) 2.62[2] cgs
Temperature 4,737[2] K
Metallicity [Fe/H] −0.20[2] dex
Other designations
ρ Gru, CD−42° 16049, FK5 3818, HD 215104, HIP 112203, HR 8644, SAO 231265[5]
Database references

Rho Gruis (ρ Gruis) is a solitary[6] star in the southern constellation of Grus. It is visible to the naked eye with an apparent visual magnitude of 4.85.[2] Based upon an annual parallax shift of 14.16 mas as seen from the Earth,[1] the system is located about 230 light years from the Sun. Rho Gruis is an evolved K-type giant star with a stellar classification of K0 III.[3] With 1.9 times the mass of the Sun[2] it is a red clump star,[2] which indicates it is generating energy through helium fusion at its core.


  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d e f g h i Liu, Y. J.; et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–66, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x. 
  3. ^ a b Houk, N. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H. 
  4. ^ a b Cousins, A. W. J. (1983), "UBV photometry of E region standard stars of intermediate brightness", South African Astronomical Observatory Circular (7): 36−46, Bibcode:1983SAAOC...7...36C. 
  5. ^ "rho Gru -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-24. 
  6. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x.