KELT-2A
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.
| 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[1] mas |
| 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]
Planetary system
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 |
See also
References
- Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID 1828208.Gaia Data Release 1 catalog entry
- Mengel, M. W.; Marsden, S. C.; Carter, B. D.; Horner, J.; King, R.; Fares, R.; Jeffers, S. V.; Petit, P.; Vidotto, A. A.; Morin, J.; the BCool Collaboration (2016), "A BCool survey of the magnetic fields of planet-hosting solar-type stars", Monthly Notices of the Royal Astronomical Society, 465 (3): 2734–2747, arXiv:1611.07604, doi:10.1093/mnras/stw2949, S2CID 17561168
- 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. hdl:1969.1/178896. S2CID 119249005.
- Martioli, Eder; Colón, Knicole D.; Angerhausen, Daniel; Stassun, Keivan G.; Rodriguez, Joseph E.; Zhou, George; Gaudi, B Scott; Pepper, Joshua; Beatty, Thomas G.; Tata, Ramarao; James, David J.; Eastman, Jason D.; Wilson, Paul Anthony; Bayliss, Daniel; Stevens, Daniel J. (2018), "A survey of eight hot Jupiters in secondary eclipse using WIRCam at CFHT", Monthly Notices of the Royal Astronomical Society, 474 (3): 4264–4277, arXiv:1711.07294, doi:10.1093/mnras/stx3009, PMC 6190681, PMID 30344345
External links
- KELT-North survey website
- "Planet KELT-2A b". The Extrasolar Planets Encyclopaedia. Archived from the original on 2012-10-19. Retrieved 2012-07-30.
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