Nu² Arae

Nu² Arae, Latinized from ν² Arae, is the Bayer designation for a star in the southern constellation of Ara. It is approximately 570 light-years (170 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.

For other star systems with this Bayer designation, see Nu Arae.

Nu² Arae

The location of ν^2 Arae (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Ara
Right ascension	17^h 51^m 11.04526^s[1]
Declination	–53° 07′ 48.9705″[1]
Apparent magnitude (V)	6.10[2]
Characteristics
Spectral type	B9.5 III-IV[3]
B−V color index	+0.01[2]
Astrometry
Radial velocity (Rv)	+18.8±1.2[4] km/s
Proper motion (μ)	RA: +14.855[1] mas/yr Dec.: +0.548[1] mas/yr
Parallax (π)	5.7499 ± 0.1048[1] mas
Distance	570 ± 10 ly (174 ± 3 pc)
Absolute magnitude (MV)	+0.14[5]
Details
Luminosity	85[5] L☉
Other designations
ν^2 Ara, CD−53° 7430, HD 161917, HIP 87379, HR 6632, SAO 245072[6]
Database references
SIMBAD	data

The star is sometimes referred as Upsilon² Arae (υ² Arae).[7]

References

1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. 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. 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, Bibcode:1975mcts.book.....H.
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, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
5. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
6. "HR 6632 -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-14
7. Note for HR 6632

External links

• Aladin previewer: Image of HD 161917