Gamma Lupi
From Infogalactic: the planetary knowledge core
 Location of γ Lupi (circled) |
|
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Lupus |
| Right ascension | 15h 35m 08.44835s[1] |
| Declination | –41° 10′ 00.3247″[1] |
| Apparent magnitude (V) | 2.77[2] |
| Characteristics | |
| Spectral type | B2 IV[3] |
| U−B color index | –0.82[4] |
| B−V color index | –0.20[4] |
| Astrometry | |
| Radial velocity (Rv) | +2.3[5] km/s |
| Proper motion (μ) | RA: −15.62[1] mas/yr Dec.: −25.43[1] mas/yr |
| Parallax (π) | 7.75 ± 0.50[1] mas |
| Distance | 420 ± 30 ly (129 ± 8 pc) |
| Absolute magnitude (MV) | –2.4[2] |
| Orbit[6] | |
| Period (P) | 190.0 yr |
| Semi-major axis (a) | 0.655" |
| Eccentricity (e) | 0.51 |
| Inclination (i) | 95.0° |
| Longitude of the node (Ω) | 94.6° |
| Periastron epoch (T) | 1885.0 |
| Argument of periastron (ω) (secondary) |
311.5° |
| Details | |
| γ Lup A | |
| Mass | 9.5 ± 0.2[3] M☉ |
| Luminosity | 5,000[2] L☉ |
| Surface gravity (log g) | 3.96[2] cgs |
| Temperature | 20,900[2] K |
| Rotational velocity (v sin i) | 270[7] km/s |
| Age | 18.6 ± 2.4[3] Myr |
| Other designations | |
Gamma Lupi (γ Lupi, γ Lup) is a 3rd-magnitude, B-type blue giant star in the constellation of Lupus. It is also known in ancient Chinese astronomy as 騎官一 or "the 1st (star) of the Cavalry Officer". With a telescope, Gamma Lupi can be resolved into a binary star system in close orbit. This is known as the Gamma Lupi AB system, often abbreviated as γ Lupi AB or γ Lup AB. Gamma Lupi A is itself a spectroscopic binary with a period of 2.8081[9] days.
This star is a proper motion member of the Upper-Centaurus Lupus sub-group in the Scorpius-Centaurus OB association, the nearest such co-moving association of massive stars to the Sun.[2]
See also
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
