HR 3803

HR 3803
Observation data; Epoch J2000 Equinox J2000
Constellation	Vela
Right ascension	09h 31m 13.31891s
Declination	–57° 02′ 03.7578″
Apparent magnitude (V)	3.16
Characteristics
Spectral type	K5 III
U−B color index	+1.88
B−V color index	+1.55
Astrometry
Radial velocity (Rv)	–13.9 km/s
Proper motion (μ)	RA: –32.54 mas/yr ; Dec.: +5.87 mas/yr
Parallax (π)	13.65 ± 0.10 mas
Distance	239 ± 2 ly ; (73.3 ± 0.5 pc)
Details
Mass	2.0 M☉
Radius	29 R☉
Temperature	3,860 K
Other designations
	N Velorum, N Vel, CP–56 2270, HD 82668, FK5 361, HIP 46701, HR 3803, SAO 237067.
Database references
SIMBAD	data

HR 3803 or N Velorum (N Vel) is a 3rd-magnitude star on the border between the southern constellations Carina and Vela. Based upon parallax measurements, it is approximately 239 light-years (73 parsecs) from Earth. It is an orange-hued K-type giant star and has twice the mass of the Sun.^[5] The measured angular diameter of this star, after correction for limb darkening, is 7.13 ± 0.08 mas.^[7] At the estimated distance of HR 3803,^[1] this yields a physical size of about 29 times the radius of the Sun.^[6]

In 1752, French astronomer Nicolas Louis de Lacaille divided the former constellation Argo Navis into three separate constellations, and then referenced its stars by extending Bayer's system of star nomenclature;^[8] this star was given the designation N Velorum. In 1871 Benjamin Apthorp Gould discovered this star to be variable, but this occurred prior to the standardization of 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 designations.^[9]

References

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (November 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, S2CID 18759600
^ ^a ^b Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, 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): 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
^ ^a ^b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.), Birkhäuser, ISBN 3540296921. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(73.3\cdot 3.72\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 58.7\cdot R_{\bigodot }\end{aligned}}$
^ Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
^ "Greek Letter Designations Southern Stars". Archived from the original on 2010-01-21. Retrieved 2012-04-13.
^ Hoffleit, Dorrit (December 1987), "History of Variable Star Nomenclature" (PDF), The Journal of the American Association of Variable Star Observers, 16 (2): 65–70, Bibcode:1987JAVSO..16...65H, retrieved 2012-02-02

This giant-star-related article is a stub. You can help Wikipedia by expanding it.

[aaa474_2_653-1] ^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (November 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, S2CID 18759600

[scfs-2] Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W

[araa11_29-3] 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.

[clpl4_99-4] Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J.

[aaa352_217-5] 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

[lang2006-6] Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.), Birkhäuser, ISBN 3540296921. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(73.3\cdot 3.72\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 58.7\cdot R_{\bigodot }\end{aligned}}$

[aaa431_773-7] Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039

[8] "Greek Letter Designations Southern Stars". Archived from the original on 2010-01-21. Retrieved 2012-04-13.

[jaavso16_2_65-9] Hoffleit, Dorrit (December 1987), "History of Variable Star Nomenclature" (PDF), The Journal of the American Association of Variable Star Observers, 16 (2): 65–70, Bibcode:1987JAVSO..16...65H, retrieved 2012-02-02

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Observation data Epoch J2000 Equinox J2000
Constellation	Vela
Right ascension	09^h 31^m 13.31891^s^[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 (R_v)	–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 mas^[1]
Distance	239 ± 2 ly (73.3 ± 0.5 pc)

Details

Mass	2.0^[5] `M`_☉
Radius	29^[6] `R`_☉
Temperature	3,860^[5] K

Other designations
N Velorum, N Vel, CP–56 2270, HD 82668, FK5 361, HIP 46701, HR 3803, SAO 237067.
Database references
SIMBAD	data