KELT-2Ab
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | KELT-2A | |
| Constellation | Auriga | |
| Right ascension | (α) | 06h 10m 39s |
| Declination | (δ) | +30° 57′ 25″ |
| Distance | 419 ± 15[1] ly (128.6 ± 4.7[1] pc) | |
| Spectral type | F7V | |
| Orbital elements | ||
| Semi-major axis | (a) | 0.5504 ± 0.00086 AU |
| Eccentricity | (e) | 0 |
| Orbital period | (P) | 4.1137913 ± 0.00001 d |
| Inclination | (i) | 88.56 ± 1.14° |
| Argument of periastron |
(ω) | 90° |
| Time of periastron | (T0) | 2455974.60338 ± 0.00083 JD |
| Semi-amplitude | (K) | 161.1 ± 7.8 m/s |
| Physical characteristics | ||
| Mass | (m) | 1.524 ± 0.088[1] MJ |
| Radius | (r) | 1.290 ± 0.057[1] RJ |
| Density | (ρ) | 940 ± 90[1] kg m−3 |
| Surface gravity | (g) | 22.7 m/s² (2.3 g) |
| Discovery information | ||
| Discovery date | 7 June 2012 | |
| Discoverer(s) | KELT-North | |
| Discovery method | Transit | |
| Discovery status | Published | |
KELT-2Ab is an extrasolar planet that orbits the star KELT-2A approximately 419 light-years away in the constellation of Auriga.[1] It was discovered by the KELT-North survey via the transit method, so both its mass and radius are known quite precisely. As of its discovery KELT-2Ab is the fifth brightest transiting Hot Jupiter known that has a well constrained mass. This makes the KELT-2A system a promising target for future space- and ground-based follow-up observations to learn about the planet's atmosphere.
The star KELT-2A is a member of the common-proper-motion binary star system KELT-2 (HD 42176). KELT-2B is an early K dwarf approximately 295 AU away.
See also
References
- 1 2 3 4 5 6 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.
- KELT-2Ab discovery lightcurve, with music
Coordinates: 
06h 10m 39s, +30° 57′ 25″
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