Nu1 Lupi

Nu¹ Lupi (ν¹ Lup) is a solitary^[7] star in the southern constellation of Lupus. It is visible to the naked eye with an apparent visual magnitude of 5.01.^[2] It is a high proper motion star^[8] with an annual parallax shift of 27.89^[1] mas as seen from Earth, yielding a distance estimate of 117 light years from the Sun.

Nu¹ Lupi

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Lupus
Right ascension	15h 22m 08.27124s[1]
Declination	−47° 55′ 40.0543″[1]
Apparent magnitude (V)	5.01[2]
Characteristics
Spectral type	F6 III-IV[3]
U−B color index	+0.04[2]
B−V color index	+0.50[2]
Astrometry
Proper motion (μ)	RA: −141.19[1] mas/yr Dec.: −132.92[1] mas/yr
Parallax (π)	27.89±0.33 mas[1]
Distance	117 ± 1 ly (35.9 ± 0.4 pc)
Absolute magnitude (MV)	+2.32[4]
Details
Mass	1.67[5] M☉
Surface gravity (log g)	3.87±0.10[5] cgs
Temperature	6,447±80[5] K
Metallicity [Fe/H]	0.17±0.05[5] dex
Rotational velocity (v sin i)	2.8±0.2[4] km/s
Age	2.0[5] Gyr
Other designations
ν1 Lup, CD−47°9922, FK5 3211, HD 136351, HIP 75206, HR 5698, SAO 225703[6]
Database references
SIMBAD	data

This is a two^[5] billion year old evolved star with a stellar classification of F6 III-IV,^[3] indicating that the spectrum has characteristics intermediate between a subgiant and giant star. It is most likely the source of X-ray emission^[8] detected at these coordinates with a luminosity of 1.09×10²⁹ erg s⁻¹.^[9] The star has an estimated 1.67^[5] times the mass of the Sun and is spinning slowly with a projected rotational velocity of 2.8 km/s.^[4]

See also

• Nu² Lupi