Phi2 Lupi
Star in the constellation Lupus From Wikipedia, the free encyclopedia
Phi2 Lupi, Latinized from φ2 Lupi, is a solitary[10] star in the southern constellation of Lupus. With an apparent magnitude of 4.535,[2] it is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 6.28 mas as seen from Earth, it is located around 520 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.052±0.013 due to interstellar dust. It is a member of the Upper Centaurus–Lupus subgroup of the Scorpius–Centaurus association.[11]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Lupus |
| Right ascension | 15h 23m 09.35005s[1] |
| Declination | −36° 51′ 30.5521″[1] |
| Apparent magnitude (V) | 4.535[2] |
| Characteristics | |
| Spectral type | B4 V[3][4] |
| U−B color index | −0.648[2] |
| B−V color index | −0.161[2] |
| Astrometry | |
| Radial velocity (Rv) | +0.80±2.70[5] km/s |
| Proper motion (μ) | RA: −18.24[1] mas/yr Dec.: −20.72[1] mas/yr |
| Parallax (π) | 6.28 ± 0.20 mas[1] |
| Distance | 520 ± 20 ly (159 ± 5 pc) |
| Absolute magnitude (MV) | −1.47[6] |
| Details | |
| Mass | 6.1±0.1[4] M☉ |
| Radius | 3.4[7] R☉ |
| Luminosity | 800[8] L☉ |
| Temperature | 16,780[3] K |
| Rotational velocity (v sin i) | 141±6[3] km/s |
| Age | 39.9±10.1[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an ordinary B-type main sequence star with a stellar classification of B4 V.[3][4] It has an estimated 6.1[4] times the mass of the Sun and about 3.4[7] times the Sun's radius. The star is roughly 40[4] million years and is spinning with a projected rotational velocity of 141 km/s.[3] It is radiating about 800[8] times the solar luminosity from its photosphere at an effective temperature of 16,780 K.[3]
References
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