Xi Lupi
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Lupus |
| ξ1 Lup | |
| Right ascension | 15h 56m 53.48964s |
| Declination | −33° 57′ 58.0131″ |
| Apparent magnitude (V) | 5.114 |
| ξ2 Lup | |
| Right ascension | 15h 56m 54.11281s |
| Declination | −33° 57′ 51.3380″ |
| Apparent magnitude (V) | 5.55 |
| Characteristics | |
| ξ1 Lup | |
| Spectral type | A3 V |
| U−B color index | 0.069 |
| B−V color index | 0.116 |
| ξ2 Lup | |
| Spectral type | B9 V |
| B−V color index | +0.06 |
| Astrometry | |
| ξ1 Lup | |
| Radial velocity (Rv) | −10.0±4.2 km/s |
| Proper motion (μ) | RA: +11.963 mas/yr Dec.: −37.94 mas/yr |
| Parallax (π) | 15.0230±0.1787 mas |
| Distance | 217 ± 3 ly (66.6 ± 0.8 pc) |
| ξ2 Lup | |
| Radial velocity (Rv) | −12.20±1.78 km/s |
| Proper motion (μ) | RA: +10.663 mas/yr Dec.: −41.073 mas/yr |
| Parallax (π) | 15.5015±0.0722 mas |
| Distance | 210.4 ± 1.0 ly (64.5 ± 0.3 pc) |
| Details | |
| ξ1 Lup A | |
| Mass | 2.0 M☉ |
| Radius | 2.0 R☉ |
| Surface gravity (log g) | 4.14±0.14 cgs |
| Temperature | 8,650 K |
| Rotational velocity (v sin i) | 78 km/s |
| Age | 450 Myr |
| ξ1 Lup B | |
| Mass | 1.65 M☉ |
| Radius | 1.6 R☉ |
| Temperature | 7,800 K |
| Age | 450 Myr |
| ξ2 Lup | |
| Mass | 2 M☉ |
| Radius | 1.74±0.04 R☉ |
| Luminosity | 22.7±1.0 L☉ |
| Surface gravity (log g) | 4.34±0.06 cgs |
| Temperature | 9,550±120 K |
| Rotational velocity (v sin i) | 184 km/s |
| Age | 500 Myr |
| Other designations | |
| CCDM J15569-3358, WDS J15569-3358 | |
| A: ξ1 Lup, CD−33°10826A, HD 142629, HIP 78105, HR 5925, SAO 207144 | |
| B: ξ2 Lup, CD−33°10826B, HD 142630, HIP 78106, HR 5926, SAO 207145 | |
| Database references | |
| SIMBAD | ξ1 Lup |
| ξ2 Lup | |
Xi Lupi is a triple star system in the southern constellation of Lupus. Its main identifier is a Bayer designation that is Latinized from ξ Lupi, and abbreviated Xi Lup or ξ Lup. The combined apparent magnitude is 4.56, making it faintly visible to the naked eye. The system is located at 210 light-years (64 parsecs) from Earth, and is a member of the Upper Scorpius sub-group of the nearby Sco OB2 association.