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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 10m 39.345s[1] |
| Declination | +30° 57′ 25.71″[1] |
| Apparent magnitude (V) | 8.68[2] |
| Characteristics | |
| Spectral type | F7 V |
| B−Vcolor index | 0.53 |
| Astrometry | |
| Radial velocity (Rv) | −47.38[1] km/s |
| Proper motion (μ) | RA: 16.865[1]mas/yr Dec.: −2.155[1]mas/yr |
| Parallax (π) | 7.4327±0.0217 mas[1] |
| Distance | 439 ± 1 ly (134.5 ± 0.4 pc) |
| Absolute magnitude (MV) | 3.27[3] |
| Details[2] | |
| Mass | 1.314+0.063 −0.06 M☉ |
| Radius | 1.84+0.07 −0.05 R☉ |
| Luminosity | 3.6 L☉ |
| Surface gravity (log g) | 4.03+0.02 −0.03 cgs |
| Temperature | 6148±48 K |
| Metallicity | 0.03±0.08 |
| Rotation | 12.9+0.2 −0.5d |
| Rotational velocity (v sin i) | 9±2 km/s |
| Age | 3.97±0.01 Gyr |
| Other designations | |
| BD+30 1138,HD 42176,HIP 29301,WDS J06107+3057,TYC 2420-899-1,2MASS J06103935+3057258 | |
| Database references | |
| SIMBAD | data |
KELT-2 (also called HD 42176) is ayellow whitemain sequence star located about 439light-years away in theconstellationAuriga. Theapparent magnitude of this star is 8.77, which means it is not visible to thenaked eye but can be seen with a binoculars.
KELT-2A is the primary star in the common-proper-motionbinary star system KELT-2 (HD 42176). KELT-2B is an earlyK dwarf approximately 295 AU away, which was discovered simultaneously with the planetKELT-2Ab.[4]
This star has one known planet, theextrasolar planetKELT-2Ab.[4]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.524 ± 0.088 MJ | 0.05504 ± 0.00086 | 4.113789 ± 0.000009 | 0 | — | 1.290 ± 0.057 RJ |
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