WASP-56
WASP-56 is a sun-like star of spectral type G6 in the constellation of Coma Berenices.[6] It has an apparent magnitude of 11.48. Observations at the Calar Alto Observatory using the lucky imaging technique detected a candidate companion star located 3.4 arc seconds away, however it is not known if this is an actual binary companion or an optical double.[7]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 12h 13m 27.8904s[1] |
| Declination | +23° 03′ 20.459″[1] |
| Apparent magnitude (V) | 11.48[2] |
| Characteristics | |
| Evolutionary stage | main sequence star |
| Spectral type | G6[3] |
| Astrometry | |
| Radial velocity (Rv) | 4.636 km/s |
| Proper motion (μ) | RA: −36.262±0.810[1] mas/yr Dec.: 0.871±0.590[1] mas/yr |
| Parallax (π) | 3.0865 ± 0.0511[1] mas |
| Distance | 1,060 ± 20 ly (324 ± 5 pc) |
| Details[4] | |
| Mass | 1.107±0.024[5] M☉ |
| Radius | 1.112+0.026 −0.022[5] R☉ |
| Surface gravity (log g) | 4.45 ± 0.1 cgs |
| Temperature | 5600 ± 100 K |
| Metallicity [Fe/H] | 0.12±0.06[5] dex |
| Rotational velocity (v sin i) | 1.5 ± 0.9 km/s |
| Age | 6.2+3.0 −2.1[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Planetary system
It has a planet that was discovered by transit photometry in 2011 by the SuperWASP program. Fourteen transits were observed over three watching seasons, each lasting 214 minutes and reducing the stars' brightness by 14 millimagnitudes.[4] The planet has around 0.6 times the mass of Jupiter and an orbital period of 4.6 days. The planet possibly has a large core of heavy metals.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.599+0.040 −0.039 MJ |
0.05614+0.00040 −0.00041 |
4.6171010±0.000003 | <0.082 | 88.5+0.1 −0.2° |
1.092+0.035 −0.033 RJ |
References
- Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID 1828208.Gaia Data Release 1 catalog entry
- Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
- "Cl* Melotte 111 AV 561". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 9 September 2013.
- Faedi, F.; et al. (2013). "WASP-54b, WASP-56b, and WASP-57b: Three new sub-Jupiter mass planets from SuperWASP". Astronomy & Astrophysics. 551: A73. arXiv:1210.2329. Bibcode:2013A&A...551A..73F. doi:10.1051/0004-6361/201220520. S2CID 14346225.
- Bonomo, A. S.; Desidera, S.; Benatti, S.; Borsa, F.; Crespi, S.; Damasso, M.; Lanza, A. F.; Sozzetti, A.; Lodato, G.; Marzari, F.; Boccato, C.; Claudi, R. U.; Cosentino, R.; Covino, E.; Gratton, R.; Maggio, A.; Micela, G.; Molinari, E.; Pagano, I.; Piotto, G.; Poretti, E.; Smareglia, R.; Affer, L.; Biazzo, K.; Bignamini, A.; Esposito, M.; Giacobbe, P.; Hébrard, G.; Malavolta, L.; et al. (2017). "The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy & Astrophysics. A107: 602. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882. S2CID 118923163.
- "Coma Berenices, constellation boundary". The Constellations. International Astronomical Union. Retrieved 27 February 2014.
- Wöllert, Maria; Brandner, Wolfgang (2015). "A Lucky Imaging search for stellar sources near 74 transit hosts". Astronomy and Astrophysics. 579. A129. arXiv:1506.05456. Bibcode:2015A&A...579A.129W. doi:10.1051/0004-6361/201526525. S2CID 118903879.
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