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.

KELT-2A
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
Distance440 ± 20 ly
(134 ± 6 pc)
Details[2]
Mass1.314+0.063
0.06
 M
Radius1.84+0.07
0.05
 R
Surface gravity (log g)4.03+0.02
0.03
[2] cgs
Temperature6148±48 K
Metallicity0.03 ± 0.08
Rotation12.9+0.2
0.5
d
Rotational velocity (v sin i)9±2 km/s
Age3.97 ± 0.01 Gyr
Other designations
BD+30 1138, Gaia DR2 3438059369839738624, HD 42176, HIP 29301, WDS J06107+3057A, TYC 2420-899-1, 2MASS J06103935+3057258
Database references
SIMBADdata
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]

The KELT-2A planetary system[4][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. 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
  2. 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
  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. hdl:1969.1/178896. S2CID 119249005.
  4. 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

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