Nu1 Lyrae

For other stars with this Bayer designation, see ν Lyrae

Nu¹ Lyrae (ν¹ Lyrae) is a star in the northern constellation of Lyra. Based upon an annual parallax shift of 2.69 mas as seen from Earth, it is located around 1,210 light years from the Sun.^[1] At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.35 due to interstellar dust.^[6] With an apparent visual magnitude of 5.91,^[2] the star is barely bright enough to be visible with the naked eye on a dark night.

ν¹ Lyrae

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Lyra
Right ascension	18h 49m 45.91823s[1]
Declination	+32° 48′ 46.1464″[1]
Apparent magnitude (V)	5.91[2]
Characteristics
Spectral type	B3 IV[3]
U−B color index	−0.71[2]
B−V color index	−0.16[2]
Variable type	Suspected[4]
Astrometry
Radial velocity (Rv)	−26.30±1.2[5] km/s
Proper motion (μ)	RA: +1.540[1] mas/yr Dec.: −3.721[1] mas/yr
Parallax (π)	2.6879±0.0507 mas[1]
Distance	1,210 ± 20 ly (372 ± 7 pc)
Absolute magnitude (MV)	−1.73[6]
Details
Mass	6.9±0.1[3] M☉
Radius	5.9[7] R☉
Luminosity	1,460[8] L☉
Surface gravity (log g)	3.86[9] cgs
Temperature	14,534[8] K
Metallicity [Fe/H]	−0.08[10] dex
Rotational velocity (v sin i)	145[11] km/s
Age	39.8±3.7[3] Myr
Other designations
ν1 Lyr, 8 Lyr, BD+32°3227, HD 174585, HIP 92398, HR 7100, SAO 67441[12]
Database references
SIMBAD	data

This is a blue-white hued B-type subgiant star with a stellar classification of B3 IV.^[3] It is a suspected variable.^[4] The star has nearly seven times the mass of the Sun and, at an estimated age of about 40^[3] million years, is spinning with a projected rotational velocity of 145 km/s.^[11] It radiates approximately 1460 times the solar luminosity from its photosphere at an effective temperature of 14,534 K.^[8]

Nu¹ Lyrae has five faint visual companions listed in the Washington Double Star Catalog, the nearest being a magnitude 13.0 star at an angular separation of 33.7 arc seconds along a position angle of 76°, as of 2015.^[13]