KELT-2A (also called KELT-2, HD 42176, or HD 42176A) is a yellow white dwarf star located about 440 light-years away in the constellation Auriga. The apparent magnitude of this star is 8.77, which means it is not visible to the naked eye but can be seen with a binoculars.
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 10m 39.347s[1] |
| Declination | +30° 57′ 25.70″[1] |
| Apparent magnitude (V) | 8.68[2] |
| Characteristics | |
| Spectral type | F7 V |
| B−V color index | 0.53 |
| Astrometry | |
| Radial velocity (Rv) | 47.5 ± 0.2 km/s |
| Proper motion (μ) | RA: 16.597±0.085[1] mas/yr Dec.: −2.077±0.055[1] mas/yr |
| Parallax (π) | 7.47 ± 0.33 mas[1] |
| Distance | 440 ± 20 ly (134 ± 6 pc) |
| Details[2] | |
| Mass | 1.314+0.063 −0.06 M☉ |
| Radius | 1.84+0.07 −0.05 R☉ |
| Surface gravity (log g) | 4.03+0.02 −0.03[2] cgs |
| Temperature | 6148±48 K |
| Metallicity | 0.03 ± 0.08 |
| Rotation | 12.9+0.2 −0.5 d |
| Rotational velocity (v sin i) | 9±2 km/s |
| Age | 3.97 ± 0.01 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia | data |
KELT-2A is the brightest star in the common-proper-motion binary star system KELT-2 (HD 42176). KELT-2B is an early K dwarf approximately 295 AU away, which was discovered simultaneously with the planet KELT-2Ab.[3]
This star has one known planet, the extrasolar planet KELT-2Ab.[3]
| 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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