Astronomy:KELT-2A
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Short description: Star in the constellation Auriga
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 (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.
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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics 595: A2. doi:10.1051/0004-6361/201629512. Bibcode: 2016A&A...595A...2G. https://www.aanda.org/articles/aa/full_html/2016/11/aa29512-16/aa29512-16.html.Gaia Data Release 1 catalog entry
- ↑ 2.0 2.1 2.2 Mengel, M. W.; Marsden, S. C.; Carter, B. D.; Horner, J.; King, R.; Fares, R.; Jeffers, S. V.; Petit, P. et al. (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, doi:10.1093/mnras/stw2949
- ↑ 3.0 3.1 3.2 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. doi:10.1088/2041-8205/756/2/L39. Bibcode: 2012ApJ...756L..39B.
- ↑ Martioli, Eder; Colón, Knicole D.; Angerhausen, Daniel; Stassun, Keivan G.; Rodriguez, Joseph E.; Zhou, George; Gaudi, B Scott; Pepper, Joshua et al. (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, doi:10.1093/mnras/stx3009, PMID 30344345
External links
- KELT-North survey website
- "Planet KELT-2A b". The Extrasolar Planets Encyclopaedia. http://exoplanet.eu/catalog/kelt-2a_b/. Retrieved 2012-07-30.
Coordinates: 
06h 10m 39s, +30° 57′ 25″
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