| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Lupus |
| Right ascension | 15h 50m 57.5376s[1] |
| Declination | −33° 37′ 37.796″[1] |
| Apparent magnitude (V) | 3.957[1] |
| Characteristics | |
| Spectral type | B9.5V + A2Vm[2] |
| U−Bcolor index | −0.13[3] |
| B−Vcolor index | −0.04[3] |
| R−Icolor index | −0.07[3] |
| Astrometry | |
| Radial velocity (Rv) | 5 ± 20[1] km/s |
| Proper motion (μ) | RA: −5.92[1]mas/yr Dec.: −24.91[1]mas/yr |
| Parallax (π) | 15.86±0.84 mas[1] |
| Distance | 210 ± 10 ly (63 ± 3 pc) |
| Details[4] | |
| χ Lup A | |
| Mass | 2.84±0.12 M☉ |
| Radius | 2.85±0.15 R☉ |
| Luminosity | 63[5] L☉ |
| Surface gravity (log g) | 4.08[5] cgs |
| Temperature | 10,200[5] K |
| Rotational velocity (v sin i) | 0[3] km/s |
| Age | 280±30 Myr |
| χ Lup B | |
| Mass | 1.94±0.09 M☉ |
| Radius | 1.75±0.18 R☉ |
| Surface gravity (log g) | 4.2 cgs |
| Temperature | 9,200 K |
| Other designations | |
| χ Lup, Chi Lupi, Chi Lup,5 Lupi, 5 Lup,CD−33 10754,CPD−33 3933,FK5 586,GC 21281,HD 141556,HIP 77634,HR 5883,PPM 294334,SAO 207040.[1] | |
| Database references | |
| SIMBAD | data |
Chi Lupi (Chi Lup,χ Lupi,χ Lup) is aspectroscopic binarystar in theconstellation ofLupus.[1] It has anapparent visual magnitude of approximately 3.957.[1] The primary star in the binary is amercury-manganese star of spectral type B9.5V; the secondary is ametallic-lined star of type A2Vm.[2]
This system is aproper motion member of the Upper Scorpius sub-group in theScorpius–CentaurusOB association,the nearest such co-moving association of massive stars to the Sun.[5]The Upper Scorpius subgroup contains thousands ofstars with an average age of 11 million years old at mean distances of 145parsecs (470light years).[6]
