KELT-2

Last updated
KELT-2
Observation data
Epoch J2000       Equinox J2000
Constellation Auriga
Right ascension 06h 10m 39.345s [1]
Declination +30° 57′ 25.71″ [1]
Apparent magnitude  (V)8.68 [2]
Characteristics
Spectral type F7 V
B−V color index 0.53
Astrometry
Radial velocity (Rv)−47.38 [1]  km/s
Proper motion (μ)RA: 16.865 [1]   mas/yr
Dec.: −2.155 [1]   mas/yr
Parallax (π)7.4327 ± 0.0217  mas [1]
Distance 439 ± 1  ly
(134.5 ± 0.4  pc)
Absolute magnitude  (MV)3.27 [3]
Details [2]
Mass 1.314+0.063
−0.06  M☉
Radius 1.84+0.07
−0.05  R☉
Luminosity 3.6  L☉
Surface gravity (log g)4.03+0.02
−0.03  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
BD+30 1138, HD  42176, HIP  29301, WDS J06107+3057, TYC  2420-899-1, 2MASS J06103935+3057258
Database references
SIMBAD data
Extrasolar Planets
Encyclopaedia 		data

KELT-2 (also called HD 42176) is a yellow white main sequence star located about 439 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.

Contents

KELT-2A is the primary 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. [4]

Planetary system

This star has one known planet, the extrasolar planet KELT-2Ab. [4]

The KELT-2 planetary system [5] [4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 1.524 ± 0.088  MJ 0.05504 ± 0.000864.113789 ± 0.0000090—1.290 ± 0.057  RJ

See also

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<span class="mw-page-title-main">KELT-2Ab</span>

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References

  1. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID   244398875. Gaia DR3 record for this source at VizieR.
  2. 1 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. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN   1063-7737. S2CID   255204555.
  4. 1 2 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.
  5. ↑ 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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