41 G. Arae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| 41 G. Ara A | |
| Right ascension | 17h 19m 03.83755s |
| Declination | −46° 38′ 10.4404″ |
| Apparent magnitude (V) | 5.61 |
| 41 G. Ara B | |
| Right ascension | 17h 19m 02.96880s |
| Declination | −46° 38′ 13.1081″ |
| Apparent magnitude (V) | 8.88 |
| Characteristics | |
| Spectral type | G8V + M0V |
| U−B color index | +0.38 |
| B−V color index | +0.80 |
| R−I color index | +0.41 |
| Astrometry | |
| 41 G. Ara A | |
| Radial velocity (Rv) | 25.96±0.14 km/s |
| Proper motion (μ) | RA: 1,029.610 mas/yr Dec.: 106.935 mas/yr |
| Parallax (π) | 113.7513±0.0725 mas |
| Distance | 28.67 ± 0.02 ly (8.791 ± 0.006 pc) |
| Absolute magnitude (MV) | 5.74 |
| 41 G. Ara B | |
| Radial velocity (Rv) | 26.02±1.17 km/s |
| Proper motion (μ) | RA: 952.035 mas/yr Dec.: 138.380 mas/yr |
| Parallax (π) | 113.86±0.03 mas |
| Distance | 28.645 ± 0.008 ly (8.783 ± 0.002 pc) |
| Orbit | |
| Primary | 41 G. Ara A |
| Name | 41 G. Ara B |
| Period (P) | 954±69 yr |
| Semi-major axis (a) | 12.752″±0.548″ (112 AU) |
| Eccentricity (e) | 0.816±0.007 |
| Inclination (i) | 35.2±0.8° |
| Longitude of the node (Ω) | 150.3±1.3° |
| Periastron epoch (T) | 1908.2±0.28 |
| Argument of periastron (ω) (secondary) | 320.2±2.5° |
| Semi-amplitude (K1) (primary) | 1.956±0.068 km/s |
| Orbit | |
| Primary | 41 G. Ara Ba |
| Name | 41 G. Ara Bb |
| Period (P) | 0.24069 yr |
| Semi-major axis (a) | 0.0410″±0.0024″ (0.36 AU) |
| Eccentricity (e) | 0.773 |
| Inclination (i) | 57.9±4.9° |
| Longitude of the node (Ω) | 170.6±3.1° |
| Periastron epoch (T) | 2015.903±0.012 |
| Argument of periastron (ω) (secondary) | 242.2±14.8° |
| Details | |
| 41 G. Ara A | |
| Mass | 0.87 M☉ |
| Radius | 0.82±0.02 R☉ |
| Luminosity | 0.46±0.02 L☉ |
| Surface gravity (log g) | 4.434±0.048 cgs |
| Temperature | 5,232+38 −45 K |
| Metallicity [Fe/H] | −0.39±0.05 dex |
| Rotational velocity (v sin i) | 1.97±0.19 km/s |
| Age | 5.5–6.3 Gyr |
| 41 G. Ara Ba | |
| Mass | 0.60 M☉ |
| Radius | 0.650 R☉ |
| 41 G. Ara Bb | |
| Mass | 0.42 M☉ |
| Other designations | |
| CD−46°11370, GJ 666, CCDM J17191-4638, WDS J17191-4638 | |
| 41 G. Ara A: HD 156274, HIP 84720, HR 6416, SAO 227816, LTT 6886, TIC 217157387, TYC 8341-4366-1 | |
| 41 G. Ara B: LHS 445, LTT 6887, NLTT 44525, TIC 217157392, TYC 8341-4365-1 | |
| Database references | |
| SIMBAD | 41 G. Ara |
| 41 G. Ara A | |
| 41 G. Ara B | |
| ARICNS | 41 G. Ara A |
| 41 G. Ara B | |
41 G. Arae (abbreviated to 41 G. Ara), also known as Gliese 666, is a trinary star system in the constellation Ara. Although often called just 41 Arae, it is more accurate to call it 41 G. Arae, as the number 41 is the Gould designation and not the Flamsteed designation. The combined apparent magnitude is +5.48, making it faintly visible to the naked eye in locations far from light pollution. This system lies at a distance of 28.7 light-years (8.8 parsecs) and thus is relatively nearby.