Nu2 Arae

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For other star systems with this Bayer designation, see Nu Arae.
Nu2 Arae
Diagram showing star positions and boundaries of the Ara constellation and its surroundings
Cercle rouge 100%.svg

The location of ν2 Arae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ara
Right ascension 17h 51m 11.04615s[1]
Declination –53° 07′ 48.9721″[1]
Apparent magnitude (V) 6.10[2]
Spectral type B9.5 III-IV[3]
B−V color index +0.01[2]
Radial velocity (Rv) +18.8 ± 1.2[4] km/s
Proper motion (μ) RA: +15.79[1] mas/yr
Dec.: +0.08[1] mas/yr
Parallax (π) 6.41 ± 0.43[1] mas
Distance 510 ± 30 ly
(160 ± 10 pc)
Other designations
CD−53° 7430, HD 161917, HIP 87379, HR 6632, SAO 245072.[5]
Database references

Nu2 Arae2 Arae, ν2 Ara) is the Bayer designation for a star in the southern constellation of Ara. It is approximately 510 light-years (160 parsecs) from the Earth and is faintly visible to the naked eye with an apparent visual magnitude of 6.10.[2] The stellar classification of B9.5 III-IV[3] shows this to be a B-type star with a spectrum that displays features part way between the subgiant and giant star stages.

The star is sometimes referred as Upsilon2 Arae2 Arae).[6]


  1. ^ a b c d e van Leeuwen, F. (November 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 Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C. 
  3. ^ a b Houk, Nancy; Cowley, A. P. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, 
  4. ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065. 
  5. ^ "HR 6632 -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-14 
  6. ^ Note for HR 6632

External links[edit]