HD 82668
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Vela |
| Right ascension | 09h 31m 13.31891s[1] |
| Declination | –57° 02′ 03.7578″[1] |
| Apparent magnitude (V) | 3.16[2] |
| Characteristics | |
| Spectral type | K5 III[3] |
| U−B color index | +1.88[4] |
| B−V color index | +1.55[4] |
| Astrometry | |
| Radial velocity (Rv) | –13.9[2] km/s |
| Proper motion (μ) | RA: –32.54[1] mas/yr Dec.: +5.87[1] mas/yr |
| Parallax (π) | 13.65 ± 0.10[1] mas |
| Distance | 239 ± 2 ly (73.3 ± 0.5 pc) |
| Details | |
| Radius | 2.0[5] R☉ |
| Temperature | 3,860[5] K |
| Other designations | |
N Velorum (N Vel) is a 3rd-magunitude star on the border between the constellations Carina and Vela. It is approximately 239 light-years (73 parsecs) from Earth.
In 1763, French astronomer Nicolas Louis de Lacaille gave this the variable star designation N Velorum. This occurred prior to the standardization of the variable star nomenclature by German astronomer Friedrich Wilhelm Argelander during the nineteenth century, so it does not fall into the standard range of variable star names.[6] It is an orange K-type giant and has twice the mass of the Sun.[5]
The star should not be confused with n Velorum.
[edit] References
- ^ 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, doi:10.1051/0004-6361:20078357
- ^ a b Wielen, R. et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions, Astronomisches Rechen-Institut Heidelberg, Bibcode 1999VeARI..35....1W
- ^ Morgan, W. W.; Keenan, P. C. (1973). "Spectral Classification". Annual Review of Astronomy and Astrophysics 11 (1): 29. Bibcode 1973ARA&A..11...29M. doi:10.1146/annurev.aa.11.090173.000333.
- ^ a b Johnson, H. L. et al (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99). Bibcode 1966CoLPL...4...99J.
- ^ a b c Gondoin, P. (December 1999), "Evolution of X-ray activity and rotation on G-K giants", Astronomy and Astrophysics 352: 217–227, Bibcode 1999A&A...352..217G
- ^ Hoffleit, Dorrit (December 1987), "History of Variable Star Nomenclature", The Journal of the American Association of Variable Star Observers 16 (2): 65–70, Bibcode 1987JAVSO..16...65H, http://www.aavso.org/files/webpublications/ejaavso/v16n2/65.pdf, retrieved 2012-02-02
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