Nu1 Canis Majoris

Nu1 Canis Majoris (ν1 Canis Majoris) is a binary star in the constellation Canis Major. It is visible to the naked eye with a combined apparent visual magnitude of 5.7.[2] Based on parallax shift of 12.366 mas as seen from our orbit, this system is approximately 264 light years from the Sun.

For other stars with this Bayer designation, see ν Canis Majoris.
Nu1 Canis Majoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Canis Major
Right ascension  06h 36m 22.85133s[1]
Declination −18° 39′ 35.6838″[1]
Apparent magnitude (V) 5.704[2] (5.87 + 7.61)[3]
Characteristics
Spectral type G8 III + F3 IV-V[3]
B−V color index +0.815[2]
Astrometry
Radial velocity (Rv)+26.13[2] km/s
Proper motion (μ) RA: −10.09[1] mas/yr
Dec.: +13.06[1] mas/yr
Parallax (π)12.3660 ± 0.1985[4] mas
Distance264 ± 4 ly
(81 ± 1 pc)
Absolute magnitude (MV)+1.23[5]
Details
ν1 CMa A
Mass1.41[2] M☉
Luminosity8[2] L☉
Surface gravity (log g)3.00[6] cgs
Temperature6,091±822[2] K
Metallicity [Fe/H]−0.06[6] dex
Rotational velocity (v sin i)4.8±0.2[5] km/s
Age3.07[2] Gyr
Other designations
ν1 CMa, 6 Canis Majoris, BD−18°1480, GC 8614, HD 47138, HIP 31564, HR 2423, SAO 151694, ADS 5253, CCDM 06364-1840, WDS 06364-1840[7]
Database references
SIMBADdata

As of 2011, the pair had an angular separation of 17.29 arc seconds along a position angle of 264.2°.[8] The yellow hued magnitude 5.87[3] primary, component A, is an evolved G-type giant star with a stellar classification of G8 III.[3] Its magnitude 7.61[3] companion, component B, is a yellow-white hued F-type main sequence/subgiant hybrid with a class of F3 IV-V.[3]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, 88.
  3. 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  4. 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.
  5. Ammler-von Eiff, M.; Reiners, A. (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: 31, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, A116.
  6. Soubiran, C.; et al. (2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788.
  7. "nu01 CMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-05.
  8. Mason, Brian D.; et al. (May 2012), "Speckle Interferometry at the U.S. Naval Observatory. XVIII", The Astronomical Journal, 143 (5): 6, Bibcode:2012AJ....143..124M, doi:10.1088/0004-6256/143/5/124, 124.
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