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HD 82668

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 ± 0.10mas
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. The measured angular diameter of this star, after correction for limb darkening, is 7.13 ± 0.08 mas. At the estimated distance of Eta Draconis, this yields a physical size of about 29 times the radius of the Sun.

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; 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.



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