KELT-2A
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 10m 39s |
| Declination | +30° 57′ 25″ |
| Apparent magnitude (V) | 8.77[1] |
| Characteristics | |
| Spectral type | F7V |
| Apparent magnitude (V) | 8.77[1] |
| Astrometry | |
| Radial velocity (Rv) | 47.5±0.2 km/s |
| Proper motion (μ) | RA: 21.2±1.4 mas/yr Dec.: -1.5±0.8 mas/yr |
| Distance | 419 ± 15 ly (128.6 ± 4.7 pc) |
| Details | |
| Mass | 1.314 (−0.060 +0.063) M☉ |
| Radius | 1.836 (−0.046 +0.066) R☉ |
| Temperature | 6148 ± 48 K |
| Metallicity | 0.03 ± 0.78 |
| Age | 3.97 ± 0.01 billion years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia | data |
KELT-2A (HD 42176A) is a yellow white dwarf star located about 419 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.
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.
Planetary system
This star has one known planet, the extrasolar planet KELT-2Ab.[1]
| 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 | 4.1137913 ± 0.00001 | 0 | — | 1.290 ± 0.057 RJ |
See also
References
- 1 2 3 Beatty, Thomas G.; et al. (2012). "KELT-2Ab: A Hot Jupiter Transiting the Bright (V = 8.77) Primary Star of a Binary System". The Astrophysical Journal Letters. 756 (2). L39. arXiv:1206.1592
. Bibcode:2012ApJ...756L..39B. doi:10.1088/2041-8205/756/2/L39.
External links
- KELT-North survey website
- "Planet KELT-2A b". The Extrasolar Planets Encyclopaedia. Retrieved 2012-07-30.
Coordinates: 
06h 10m 39s, +30° 57′ 25″
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