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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.
| 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 | |
| Database references | |
| SIMBAD | data |
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
editThis star has one known planet, the extrasolar planet KELT-2Ab.[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
editReferences
edit- ^ 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.
- ^ 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
- ^ 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.
- ^ 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.
- ^ 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
edit- 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.
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