Nu1 Lyrae
Star in the constellation Lyra
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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.
 | |
| 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]