Astronomy:KELT-6
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 13h 03m 55.65s[1] |
| Declination | +30° 38′ 24.28″[1] |
| Apparent magnitude (V) | 10.34±0.05[2] |
| Characteristics | |
| Spectral type | F8IV-V[2] |
| Astrometry | |
| Radial velocity (Rv) | 1.62±0.27[1] km/s |
| Proper motion (μ) | RA: −5.106±0.052[1] mas/yr Dec.: +15.640±0.046[1] mas/yr |
| Parallax (π) | 4.1255 ± 0.0338[1] mas |
| Distance | 791 ± 6 ly (242 ± 2 pc) |
| Details | |
| Mass | 1.13±0.06[3] M☉ |
| Radius | 1.53±0.14[3] R☉ |
| Luminosity | 3.25+0.94 −0.81[2] L☉ |
| Surface gravity (log g) | 4.07±0.06[4] cgs |
| Temperature | 6,272±61[3] K |
| Metallicity [Fe/H] | -0.28[4] dex |
| Rotational velocity (v sin i) | 4.53±0.26[5] km/s |
| Age | 4.9+0.7 −0.5[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
KELT-6, also known as BD+31 2447, is a star in the constellation Coma Berenices. With an apparent magnitude of 10.34, it is impossible to see with the unaided eye, but can be seen with a powerful telescope. The star is located 791 light years away from the Solar System based on parallax, but is drifting away with a radial velocity of 1.62 km/s.
Properties
KELT-6 is an F-type star that is 13% more massive and 53% larger than the Sun. It radiates at 3.25 times the Sun's luminosity from its photosphere at an effective temperature of 6,727 K. KELT-6 has a projected rotational velocity of 4.53 km/s, and is slightly older than the Sun, with an age of 4.9 billion years. Unlike most host stars of exoplanets, it has a poor metallicity, with 52.5% the abundance of heavy metals compared to the Sun.
Planetary system
In 2013, a long period "hot Jupiter" was discovered orbiting the star using the transit method.[2] Another planet was discovered in 2015 using radial velocity (Doppler spectroscopy) method.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.44±0.02[3] MJ | 0.08±0.00[3] | 7.85±0.00[3] | 0.22±0.11[4] | 88.81±0.85[4]° | 1.18±0.11[3] RJ |
| c | 3.71±0.21[5] MJ | 2.39±0.11[5] | 1,276+81 −67[5] |
0.21±0.04[5] | — | — |
See also
- List of most luminous stars
- List of most massive stars
- Lists of stars
- Lists of stars by constellation
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Collins, Karen A.; Eastman, Jason D.; Beatty, Thomas G.; Siverd, Robert J.; Gaudi, B. Scott; Pepper, Joshua; Kielkopf, John F.; Johnson, John Asher et al. (2014-02-01). "KELT-6b: A P ~ 7.9 Day Hot Saturn Transiting a Metal-poor Star with a Long-period Companion". The Astronomical Journal 147 (2): 39. doi:10.1088/0004-6256/147/2/39. ISSN 0004-6256. Bibcode: 2014AJ....147...39C. http://adsabs.harvard.edu/abs/2014AJ....147...39C.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Bonomo, A. S.; Desidera, S.; Benatti, S.; Borsa, F.; Crespi, S.; Damasso, M.; Lanza, A. F.; Sozzetti, A. et al. (June 2017). "The GAPS Programme with HARPS-N at TNG: XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets⋆". Astronomy & Astrophysics 602: A107. doi:10.1051/0004-6361/201629882. Bibcode: 2017A&A...602A.107B.
- ↑ 4.0 4.1 4.2 4.3 Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (1 March 2017). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal 153 (3): 136. doi:10.3847/1538-3881/aa5df3. ISSN 0004-6256. Bibcode: 2017AJ....153..136S.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Damasso, M.; Esposito, M.; Nascimbeni, V.; Desidera, S.; Bonomo, A. S.; Bieryla, A.; Malavolta, L.; Biazzo, K. et al. (1 September 2015). "The GAPS programme with HARPS-N at TNG. IX. The multi-planet system KELT-6: Detection of the planet KELT-6 c and measurement of the Rossiter-McLaughlin effect for KELT-6 b". Astronomy and Astrophysics 581: L6. doi:10.1051/0004-6361/201526995. ISSN 0004-6361. Bibcode: 2015A&A...581L...6D.
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