41 G. Arae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h 19m 03.83755s |
| Declination | −46° 38′ 10.4404″ |
| Apparent magnitude (V) | 5.48 (5.61 / 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 | |
| Radial velocity (Rv) | 25.96±0.14 km/s |
| Proper motion (μ) | RA: 1029.610 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 |
| Orbit | |
| Primary | 41 G. Ara A |
| Companion | 41 G. Ara B |
| Period (P) | 954.2±68.7 yr |
| Semi-major axis (a) | 12.752±0.548″ |
| 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 |
| Companion | 41 G. Ara Bb |
| Period (P) | 0.24069 yr |
| Semi-major axis (a) | 0.0410±0.0024″ |
| 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 | 0.79 R☉ |
| Luminosity | 0.42 L☉ |
| Surface gravity (log g) | 4.5 cgs |
| Temperature | 5,305 K |
| Metallicity [Fe/H] | −0.35 dex |
| Rotational velocity (v sin i) | 4.5 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 | |
| 41 G. Arae, CD−46°11370, GJ 666, HD 156274, HIP 84720, HR 6416, LHS 444, LTT 6886, SAO 227816, LPM 636, LFT 1334 | |
| 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 28.7 light-years (8.8 parsecs) from the Sun. 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.