Rho Lupi
Star in the constellation Lupus
From Wikipedia, the free encyclopedia
Rho Lupi, Latinized from ρ Lupi, is a solitary[10] star in the southern constellation of Lupus. It is visible to the naked eye with an apparent visual magnitude of 4.05.[2] Based upon an annual parallax shift of 10.32 mas as seen from Earth, it is located about 316 light years from the Sun. It is a member of the Upper Centaurus–Lupus subgroup of the nearby Scorpius–Centaurus association.[11]
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Lupus |
| Right ascension | 14h 37m 53.22583s[1] |
| Declination | −49° 25′ 32.9798″[1] |
| Apparent magnitude (V) | 4.05[2] |
| Characteristics | |
| Spectral type | B3/4 V[3] |
| U−B color index | −0.56[2] |
| B−V color index | −0.15[2] |
| Astrometry | |
| Radial velocity (Rv) | 8.00±7.40[4] km/s |
| Proper motion (μ) | RA: −28.26[1] mas/yr Dec.: −28.82[1] mas/yr |
| Parallax (π) | 10.32±0.16 mas[1] |
| Distance | 316 ± 5 ly (97 ± 2 pc) |
| Absolute magnitude (MV) | −0.88[5] |
| Details | |
| Mass | 4.66[6] M☉ |
| Radius | 3.4[7] R☉ |
| Luminosity | 365[8] L☉ |
| Temperature | 15,947±542[6] K |
| Rotational velocity (v sin i) | 166[6] km/s |
| Age | 44[6] Myr |
| Other designations | |
| ρ Lup, CD−48°9198, FK5 3158, HD 128345, HIP 71536, HR 5453, SAO 225071[9] | |
| Database references | |
| SIMBAD | data |
This is a B-type main sequence star with a stellar classification of B3/4 V.[3] Rho Lupi was discovered to be a variable star when the Hipparcos data was analyzed.[13] It is a microvariable with a period of 10.7 hours and an amplitude of 0.0046 in magnitude.[14] With an age of just 44[6] million years, the star is spinning with a projected rotational velocity of 166 km/s.[6] This is giving the star an oblate shape with an equatorial bulge that is an estimated 6% larger than the polar radius.[15] It has an estimated 4.66[6] times the mass of the Sun and about 3.4[7] times the Sun's radius. It is radiating 365[8] times the solar luminosity from its outer atmosphere at an effective temperature of 15,947 K.[6]