KELT-2

KELT-2

Observation data Epoch J2000      Equinox J2000
Constellation	Auriga
Right ascension	06^h 10^m 39.345^s[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

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-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. 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. 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. 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.