Nu Leporis

Nu Leporis, Latinized from ν Leporis, is a probable astrometric binary^[11] star system in the constellation Lepus. It is visible to the naked eye as a faint star with an apparent visual magnitude of 5.29.^[2] Based upon an annual parallax shift of 7.70 mas as seen from the Earth,^[1] it is 420 light years from the Sun.

Nu Leporis

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Lepus
Right ascension	05h 19m 59.02275s[1]
Declination	−12° 18′ 56.1139″[1]
Apparent magnitude (V)	5.29[2]
Characteristics
Spectral type	B7/8 V[3] or B7 IVnn[4]
U−B color index	−0.41[2]
B−V color index	−0.12[2]
Astrometry
Radial velocity (Rv)	+16.0±7.4[5] km/s
Proper motion (μ)	RA: −13.32[1] mas/yr Dec.: +7.18[1] mas/yr
Parallax (π)	9.78±0.37 mas[1]
Distance	330 ± 10 ly (102 ± 4 pc)
Absolute magnitude (MV)	+0.25[6]
Details
Mass	3.28±0.05[7] M☉
Radius	3.0[8] R☉
Luminosity	138[7] L☉
Temperature	12,417[7] K
Rotational velocity (v sin i)	285[9] km/s
Other designations
ν Lep, 7 Lep, BD−12° 1132, FK5 2380, GC 6538, HD 34863, HIP 24873, HR 1757, SAO 150345[10]
Database references
SIMBAD	data

The visible component is a B-type star with an estimated 3.3^[7] times the mass of the Sun. Lesh (1968) gave a stellar classification of B7 IVnn,^[4] which would indicate this is a somewhat evolved subgiant star. The 'nn' notation indicates especially "nebulous" absorption lines caused by rapid rotation. Houk and Smith-Moore (1978) listed it as B7/8 V,^[3] suggesting this is instead a B-type main sequence star that has not yet consumed all the hydrogen at its core.

Nu Leporis is spinning rapidly with a projected rotational velocity of 285 km/s.^[9] The star has a radius about three^[8] times that of the Sun and is radiating 138 times the Sun's luminosity from its photosphere at an effective temperature of 12,417 K.^[7]