| |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Lupus |
| Right ascension | 14h37m 53.22583s[2] |
| Declination | −49° 25′ 32.9798″[2] |
| Apparent magnitude (V) | 4.05[3] |
| Characteristics | |
| Spectral type | B3/4 V[4] |
| U−B color index | −0.56[3] |
| B−V color index | −0.15[3] |
| Astrometry | |
| Radial velocity (Rv) | 8.00±7.40[5] km/s |
| Proper motion (μ) | RA: −28.26[2] mas/yr Dec.: −28.82[2] mas/yr |
| Parallax (π) | 10.32 ± 0.16 mas[2] |
| Distance | 316 ± 5 ly (97 ± 2 pc) |
| Absolute magnitude (MV) | −0.88[6] |
| Details | |
| Mass | 4.66[7] M☉ |
| Radius | 3.4[8] R☉ |
| Luminosity | 365[9] L☉ |
| Temperature | 15,947±542[7] K |
| Rotational velocity (v sin i) | 166[7] km/s |
| Age | 44[7] Myr |
| Other designations | |
ρ Lup, CD−48° 9198, FK5 3158, HD 128345, HIP 71536, HR 5453, SAO 225071.[10] | |
| Database references | |
| SIMBAD | data |
Rho Lupi, Latinized from ρ Lupi, is a solitary[11] star in the southern constellationofLupus. It is visible to the naked eye with an apparent visual magnitude of 4.05.[3] 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.[12]
This is a B-type main sequence star with a stellar classification of B3/4 V.[4] It is a microvariable with a period of 10.7 hours and an amplitude of 0.0046 in magnitude.[13] With an age of just 44[7] million years, the star is spinning with a projected rotational velocity of 166 km/s.[7] This is giving the star an oblate shape with an equatorial bulge that is an estimated 6% larger than the polar radius.[14] It has an estimated 4.66[7] times the mass of the Sun and about 3.4[8] times the Sun's radius. It is radiating 365[9] times the solar luminosity from its outer atmosphere at an effective temperature of 15,947 K.[7]
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