Astronomy:N Carinae

From HandWiki
N Carinae
Observation data
Equinox J2000.0]] (ICRS)
Constellation Carina
Right ascension  06h 34m 58.57993s[1]
Declination −52° 58′ 32.1919″[1]
Apparent magnitude (V) 4.35[2]
Spectral type A0II[3] or B9III[4]
B−V color index −0.021±0.016[2]
Radial velocity (Rv)+22.5±0.5[2] km/s
Proper motion (μ) RA: -7.65[1] mas/yr
Dec.: +10.54[1] mas/yr
Parallax (π)2.39 ± 0.13[1] mas
Distance1,360 ± 70 ly
(420 ± 20 pc)
Absolute magnitude (MV)−3.75[2]
Mass7.9±0.2[5] M
Radius3.6[6] R
Luminosity3,411.35[2] L
Temperature8,004[7] K
Rotational velocity (v sin i)47[8] km/s
Age37.4±4.2[5] Myr
Other designations
N Car, CPD−52°953, FK5 2508, GC 8604, HD 47306, HIP 31407, HR 2435, SAO 234589[9]
Database references

N Carinae is a single[10] star in the constellation Carina, just to the northeast of the prominent star Canopus. This object has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.35.[2] Based on parallax, it is located at a distance of approximately 1,360 light years from the Sun.[1] It has an absolute magnitude of −3.75,[2] and is drifting further away with a radial velocity of +22.5 km/s.[2]

This object has a stellar classification of A0II,[3] matching a massive bright giant. In the past it had received a class of B9III,[4] which is sometimes still used.[5] The star is 37 million years old with 7.9 times the mass of the Sun.[5] It is spinning with a projected rotational velocity of 47 km/s.[8] N Carinae is radiating 3,411[2] times the luminosity of the Sun from its photosphere at an effective temperature of 8,004 K.[7]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode2007A&A...474..653V. 
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A. 
  3. 3.0 3.1 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, 
  4. 4.0 4.1 Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin 51, Bibcode1962RGOB...51...79E. 
  5. 5.0 5.1 5.2 5.3 Tetzlaff, N. et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode2011MNRAS.410..190T. 
  6. Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode2001A&A...367..521P. 
  7. 7.0 7.1 McDonald, I. et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society 427: 343, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode2012MNRAS.427..343M. 
  8. 8.0 8.1 Royer, F. et al. (January 2002), "Rotational velocities of A-type stars. I. Measurement of v sin i in the southern hemisphere", Astronomy and Astrophysics 381: 105–121, doi:10.1051/0004-6361:20011422, Bibcode2002A&A...381..105R. 
  9. "N Car". SIMBAD. Centre de données astronomiques de Strasbourg. 
  10. 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode2008MNRAS.389..869E.