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.

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]
Distance439 ± 1 ly
(134.5 ± 0.4 pc)
Absolute magnitude (MV)3.27[3]
Details[2]
Mass1.314+0.063
−0.06
 M
Radius1.84+0.07
−0.05
 R
Luminosity3.6 L
Surface gravity (log g)4.03+0.02
−0.03
 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, HD 42176, HIP 29301, WDS J06107+3057, TYC 2420-899-1, 2MASS J06103935+3057258
Database references
SIMBADdata

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

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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 ± 0.00086 4.113789 ± 0.000009 0 1.290 ± 0.057 RJ

See also

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References

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  1. ^ a b c d e f 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. ^ a b 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. ^ a b c 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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