Nu2 Lyrae
Star in the constellation Lyra
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Nu2 Lyrae, Latinized from ν2 Lyrae, or sometimes simply Nu Lyrae, is a solitary[9] star in the northern constellation of Lyra. Based upon an annual parallax shift of 13.92 mas as seen from Earth, it is located around 234 light years from the Sun.[1] With an apparent visual magnitude of 5.23,[2] it is bright enough to be faintly visible to the naked eye.
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 49m 52.91732s[1] |
| Declination | +32° 33′ 03.8170″[1] |
| Apparent magnitude (V) | 5.23[2] |
| Characteristics | |
| Spectral type | A3 V[3] |
| U−B color index | +0.12[2] |
| B−V color index | +0.10[2] |
| Astrometry | |
| Radial velocity (Rv) | +6.59±0.29[1] km/s |
| Proper motion (μ) | RA: −10.685[1] mas/yr Dec.: −11.771[1] mas/yr |
| Parallax (π) | 13.9238±0.0703 mas[1] |
| Distance | 234 ± 1 ly (71.8 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.97[4] |
| Details | |
| Mass | 1.91[5] M☉ |
| Radius | 1.5[6] R☉ |
| Luminosity | 32[7] L☉ |
| Surface gravity (log g) | 3.89±0.14[5] cgs |
| Temperature | 8,912±303[5] K |
| Rotational velocity (v sin i) | 128[3] km/s |
| Age | 214[5] Myr |
| Other designations | |
| ν2 Lyr, 9 Lyr, BD+32°3228, HD 174602, HIP 92405, HR 7102, SAO 67446.[8] | |
| Database references | |
| SIMBAD | data |
This is a white-hued A-type main sequence star with a stellar classification of A3 V.[3] At an estimated age of 214 million years,[5] it is spinning with a projected rotational velocity of 128 km/s.[3] This is giving the star an oblate shape with an equatorial bulge that is 5% larger than the polar radius.[10] Nu2 Lyrae has an estimated 1.9 times the mass of the Sun[5] and about 1.5 times the Sun's radius.[6] It is radiating 32 times the solar luminosity[7] from its photosphere at an effective temperature of around 8,912 K.[5]