| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Carina |
| Right ascension | 10h 55m 58.915s[2] |
| Declination | −60° 23′ 33.44″[2] |
| Apparent magnitude (V) | 8.67[3] (8.4 to 8.9)[4] |
| Characteristics | |
| Evolutionary stage | Supergiant |
| Spectral type | B0/2eq[5] |
| B−V color index | 0.552±0.025[3] |
| Variable type | Unique[4] |
| Astrometry | |
| Proper motion (μ) | RA: −6.966 mas/yr[2] Dec.: 2.056 mas/yr[2] |
| Parallax (π) | 0.4079±0.0185 mas[2] |
| Distance | 8,000 ± 400 ly (2,500 ± 100 pc) |
| Absolute magnitude (MV) | −6.21[6] |
| Orbit[6] | |
| Period (P) | 31.01±0.01 d |
| Semi-major axis (a) | 0.61±0.03 AU |
| Eccentricity (e) | 0.50±0.03 |
| Inclination (i) | 60±20° |
| Periastron epoch (T) | 2,452,069.36±1.30 JD |
| Argument of periastron (ω) (secondary) | 339.87+3.10 −3.06° |
| Semi-amplitude (K1) (primary) | 48.57+2.04 −1.87 km/s |
| Details[6] | |
| Supergiant | |
| Mass | 24±4 M☉ |
| Radius | 27+9 −7 R☉ |
| Luminosity | 1.8+1.0 −0.7×105 L☉ |
| Temperature | 23,000±2,000 K |
| Companion | |
| Mass | 7.2 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
GG Carinae is a binary star system in the southern constellation of Carina, abbreviated GG Car. It is a variable star with a brightness that fluctuates around an apparent visual magnitude of 8.67,[3] making it too faint to be visible to the naked eye. The distance to this system is approximately 8,000 light years based on parallax measurements.[2]
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