BG Indi
Light curves from TESS data for the two eclipsing binaries comprising BG Indi, adapted from Borkovits et al. (2021) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Indus |
| Right ascension | 21h 58m 30.04050s |
| Declination | −59° 00′ 43.4938″ |
| Apparent magnitude (V) | 6.141 (6.11 - 6.36) |
| Characteristics | |
| Spectral type | F3V |
| Variable type | Algol |
| Astrometry | |
| Radial velocity (Rv) | 19.0 ± 0.5 km/s |
| Proper motion (μ) | RA: 24.729 mas/yr Dec.: 15.315 mas/yr |
| Parallax (π) | 19.5917±0.2028 mas |
| Distance | 166 ± 2 ly (51.0 ± 0.5 pc) |
| Absolute magnitude (MV) | 2.45 / 3.02 / 7.23 / 7.83 |
| Absolute bolometric magnitude (Mbol) | 2.45 / 3.04 / 6.72 / 7.09 |
| Orbit | |
| Primary | BG Ind A |
| Companion | BG Ind B |
| Period (P) | 720.9+3.4 −3.1 d yr |
| Semi-major axis (a) | 540.4+2.7 −2.2 R☉ |
| Eccentricity (e) | 0.209+0.028 −0.048 |
| Inclination (i) | 85.5+3.1 −6.3° |
| Periastron epoch (T) | 2458699+14 −21 |
| Argument of periastron (ω) (secondary) | 1.6+9.2 −8.8° |
| Semi-amplitude (K1) (primary) | 12.57+0.17 −0.24 km/s |
| Semi-amplitude (K2) (secondary) | 26.02+0.31 −0.50 km/s |
| Orbit | |
| Primary | BG Ind Aa |
| Companion | BG Ind Ab |
| Period (P) | 1.464065(2) d yr |
| Semi-major axis (a) | 7.602+0.038 −0.043 R☉ |
| Eccentricity (e) | 0 |
| Inclination (i) | 73.27+0.06 −0.13° |
| Periastron epoch (T) | 2458326.1362+0.0011 −0.0012 |
| Semi-amplitude (K1) (primary) | 120.47+1.12 −0.75 km/s |
| Semi-amplitude (K2) (secondary) | 130.99+0.48 −0.50 km/s |
| Orbit | |
| Primary | BG Ind Ba |
| Companion | BG Ind Bb |
| Period (P) | 0.528349(2) d yr |
| Semi-major axis (a) | 3.025+0.011 −0.016 R☉ |
| Eccentricity (e) | 0 |
| Inclination (i) | 84.29+0.85 −0.87° |
| Periastron epoch (T) | 2458325.8072+0.0025 −0.0022 |
| Semi-amplitude (K1) (primary) | 138.98+1.23 −1.39 km/s |
| Semi-amplitude (K2) (secondary) | 149.25+1.09 −1.13 km/s |
| Details | |
| κ1 Ind Aa | |
| Mass | 1.432+0.015 −0.024 M☉ |
| Radius | 2.339+0.016 −0.021 R☉ |
| Luminosity (bolometric) | 8.433+0.199 −0.169 L☉ |
| Surface gravity (log g) | 3.852+0.011 −0.005 cgs |
| Temperature | 6442+29 −28 K |
| κ1 Ind Ab | |
| Mass | 1.315+0.026 −0.023 M☉ |
| Radius | 1.592+0.047 −0.019 R☉ |
| Luminosity (bolometric) | 4.934+0.279 −0.179 L☉ |
| Surface gravity (log g) | 4.150+0.007 −0.016 cgs |
| Temperature | 6816±26 K |
| κ1 Ind Ba | |
| Mass | 0.688+0.008 −0.011 M☉ |
| Radius | 0.642+0.005 −0.007 R☉ |
| Luminosity (bolometric) | 0.167±0.009 L☉ |
| Surface gravity (log g) | 4.660+0.003 −0.002 cgs |
| Temperature | 4609+48 −49 K |
| κ1 Ind Bb | |
| Mass | 0.640+0.010 −0.011 M☉ |
| Radius | 0.611+0.008 −0.009 R☉ |
| Luminosity (bolometric) | 0.118±0.009 L☉ |
| Surface gravity (log g) | 4.672±0.004 cgs |
| Temperature | 4327+62 −57 K |
| Other designations | |
| κ1 Ind, BG Ind, CD−59°7830, FK5 3752, HD 208496, HIP 108478, HR 8369, SAO 247247 | |
| Database references | |
| SIMBAD | data |
BG Indi, also known as κ1 Indi (Kappa1 Indi) is a multiple star system in the southern constellation of Indus. Its average apparent magnitude is 6.141, meaning it can only be seen by the naked eye under exceptionally good viewing conditions. Stellar parallax measurements by Gaia put the system at about 166 light-years (51 parsecs) away.