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 | |
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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 |
Constellation of Auriga | |||||||||||
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