From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  06h 10m 39.347s[1]
Declination +30° 57′ 25.70″[1]
Apparent magnitude (V) 8.77[2]
Spectral type F7 V
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)
Mass1.314 (−0.060 +0.063) M
Radius1.836 (−0.046 +0.066) R
Temperature6148 ± 48 K
Metallicity0.03 ± 0.78
Age3.97 ± 0.01 Gyr
Other designations
HD 42176A, WDS J06107+3057A, TYC 2420-899-1
Database references
Extrasolar Planets

KELT-2A (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.

Planetary system[edit]

This star has one known planet, the extrasolar planet KELT-2Ab.[3]

The KELT-2A planetary system
(in order from star)
Mass Semimajor axis
Orbital period
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[edit]


  1. ^ a b c d e 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.Gaia Data Release 1 catalog entry
  2. ^ Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002). "The Tycho double star catalogue". Astronomy and Astrophysics. 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822.
  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[edit]

Coordinates: Sky map 06h 10m 39s, +30° 57′ 25″