KELT-2

KELT-2

Observation data Epoch J2000       Equinox J2000
Constellation	Auriga [1]
Right ascension	06h 10m 39.345s [2]
Declination	+30° 57′ 25.71″ [2]
Apparent magnitude  (V)	8.68 [3]
Characteristics
Spectral type	F7 V [1]
B−V color index	0.53 [1]
Astrometry
Radial velocity (Rv)	−47.38 [2] km/s
Proper motion (μ)	RA: 16.865 [2] mas/yr Dec.: −2.155 [2] mas/yr
Parallax (π)	7.4327±0.0217  mas [2]
Distance	439 ± 1  ly (134.5 ± 0.4  pc)
Absolute magnitude  (MV)	3.27 [1]
Details [3]
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

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.

Description

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 ± 0.00086	4.113789 ± 0.000009	0	—	1.290 ± 0.057  RJ

See also

• KELT

References

1. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
2. 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.
3. 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
4. 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

External links

• KELT-North survey website Archived 2019-01-24 at the Wayback Machine
• "Planet KELT-2A b". Extrasolar Planets Encyclopaedia . Archived from the original on 2012-10-19. Retrieved 2012-07-30.