KELT-2
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| KELT-2A | |
| Right ascension | 06h 10m 39.345s |
| Declination | +30° 57′ 25.71″ |
| Apparent magnitude (V) | 8.77±0.01 |
| KELT-2B | |
| Right ascension | 06h 10m 39.258s |
| Declination | +30° 57′ 27.85″ |
| Apparent magnitude (V) | 11.9±0.2 |
| Characteristics | |
| Spectral type | F7 V + K2 V |
| Apparent magnitude (G) | 8.59 + 11.99 |
| B−V color index | 0.53 |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −47.38 km/s |
| Proper motion (μ) | RA: 16.865 mas/yr Dec.: −2.155 mas/yr |
| Parallax (π) | 7.4327±0.0217 mas |
| Distance | 439 ± 1 ly (134.5 ± 0.4 pc) |
| Absolute magnitude (MV) | 3.27 |
| B | |
| Radial velocity (Rv) | −40.93±2.01 km/s |
| Proper motion (μ) | RA: 17.864±0.026 mas/yr Dec.: −3.589±0.019 mas/yr |
| Parallax (π) | 7.2950±0.0255 mas |
| Distance | 447 ± 2 ly (137.1 ± 0.5 pc) |
| Details | |
| A | |
| Mass | 1.314+0.063 −0.060 M☉ |
| Radius | 1.84+0.07 −0.05 R☉ |
| Luminosity | 3.5 L☉ |
| Surface gravity (log g) | 4.03+0.02 −0.03 cgs |
| Temperature | 6148±48 K |
| Metallicity [Fe/H] | 0.03±0.08 dex |
| Rotation | 12.9+0.2 −0.5 d |
| Rotational velocity (v sin i) | 9±2 km/s |
| Age | 3.97±0.01 Gyr |
| B | |
| Mass | 0.78 M☉ |
| Radius | 0.7 R☉ |
| Surface gravity (log g) | 4.65 cgs |
| Temperature | 4850±150 K |
| Other designations | |
| BD+30 1138, HD 42176, HIP 29301, WDS J06107+3057, TYC 2420-899-1, 2MASS J06103935+3057258 | |
| Database references | |
| SIMBAD | HD 42176 |
| HD 42176 B | |
KELT-2 (also called HD 42176) is a binary star located about 439 light-years away in the constellation Auriga. The apparent magnitude of the system is 8.68, which means it is not visible to the naked eye but can be seen with binoculars. The system is moving towards the Sun at over 40 km/s.