KELT-2
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Auriga |
| KELT-2A | |
| Right ascension | 06h 10m 39.345s |
| Declination | +30° 57′ 25.71″ |
| Apparent magnitude (V) | 8.77±0.01 |
| KELT-2B | |
| Right ascension | 06h 10m 39.258s |
| Declination | +30° 57′ 27.85″ |
| Apparent magnitude (V) | 11.9±0.2 |
| Characteristics | |
| Spectral type | F7 V + K2 V |
| Apparent magnitude (G) | 8.59 + 11.99 |
| B−V color index | 0.53 |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −47.38 km/s |
| Proper motion (μ) | RA: 16.865 mas/yr Dec.: −2.155 mas/yr |
| Parallax (π) | 7.4327±0.0217 mas |
| Distance | 439 ± 1 ly (134.5 ± 0.4 pc) |
| Absolute magnitude (MV) | 3.27 |
| B | |
| Radial velocity (Rv) | −40.93±2.01 km/s |
| Proper motion (μ) | RA: 17.864±0.026 mas/yr Dec.: −3.589±0.019 mas/yr |
| Parallax (π) | 7.2950±0.0255 mas |
| Distance | 447 ± 2 ly (137.1 ± 0.5 pc) |
| Details | |
| A | |
| Mass | 1.314+0.063 −0.060 M☉ |
| Radius | 1.84+0.07 −0.05 R☉ |
| Luminosity | 3.5 L☉ |
| Surface gravity (log g) | 4.03+0.02 −0.03 cgs |
| Temperature | 6148±48 K |
| Metallicity [Fe/H] | 0.03±0.08 dex |
| Rotation | 12.9+0.2 −0.5 d |
| Rotational velocity (v sin i) | 9±2 km/s |
| Age | 3.97±0.01 Gyr |
| B | |
| Mass | 0.78 M☉ |
| Radius | 0.7 R☉ |
| Surface gravity (log g) | 4.65 cgs |
| Temperature | 4850±150 K |
| Other designations | |
| BD+30 1138, HD 42176, HIP 29301, WDS J06107+3057, TYC 2420-899-1, 2MASS J06103935+3057258 | |
| Database references | |
| SIMBAD | HD 42176 |
| HD 42176 B | |
KELT-2 (also called HD 42176) is a binary star located about 439 light-years away in the constellation Auriga. The apparent magnitude of the system is 8.68, which means it is not visible to the naked eye but can be seen with binoculars. The system is moving towards the Sun at over 40 km/s.
Description
KELT-2A is the primary star in the common-proper-motion binary star system KELT-2 (HD 42176). It is an F-type main sequence star about 1.314 times as massive as the sun. It has about 1.84 times the Sun's radius and radiates 3.5 times the Sun's luminosity at a temperature of about 6148 K. It is 3.97 billion years old and has a rotational velocity of around 9 km/s. KELT-2B is an early K dwarf approximately 295 AU away, which was discovered simultaneously with the planet KELT-2Ab in 2012. It has 78% of the Sun's mass, 70% of its radius, and an effective temperature of 4850±150 K.
Planetary system
This star has one known planet, the extrasolar planet KELT-2Ab, a hot jupiter orbiting the star at an average distance of 0.05504±0.00086 AU with an orbital period of 4.11379±0.00001 days.
| 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
References
- 1 2 3 4 5 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.
- 1 2 3 4 5 6 7 8 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.
- 1 2 3 4 5 6 7 8 9 10 11 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.
- 1 2 3 4 5 6 7 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.
- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 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, Bibcode:2017MNRAS.465.2734M, doi:10.1093/mnras/stw2949, S2CID 17561168
- ↑ 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, Bibcode:2018MNRAS.474.4264M, 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.
