HAT-P-8
HAT-P-8 is a magnitude 10 star located 700 light-years away in Pegasus.[2] It is a F-type star about 28% more massive than the Sun.[3] Two red dwarf companions have been detected around HAT-P-8. The first has a spectral type of M5V and has a mass of 0.22 M☉. The second is even less massive, at 0.18 M☉, and its spectral type is M6V.[6]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 52m 09.8636s[1] |
| Declination | +35° 26′ 49.608″[1] |
| Apparent magnitude (V) | 10.17[2] |
| Characteristics | |
| Spectral type | F[3] |
| Apparent magnitude (B) | 10.77 ± 0.04[2] |
| Apparent magnitude (V) | 10.36 ± 0.03[2] |
| Apparent magnitude (J) | 9.214 ± 0.022[2] |
| Apparent magnitude (H) | 9.004 ± 0.018[2] |
| Apparent magnitude (K) | 8.953 ± 0.013[2] |
| Variable type | planetary transit[3] |
| Astrometry | |
| Radial velocity (Rv) | −22.2±0.3[1] km/s |
| Proper motion (μ) | RA: 74.676(19) mas/yr[1] Dec.: 14.944(20) mas/yr[1] |
| Parallax (π) | 4.6606 ± 0.0208 mas[1] |
| Distance | 700 ± 3 ly (214.6 ± 1.0 pc) |
| Details | |
| Mass | 1.27±0.03[4] M☉ |
| Radius | 1.491+0.016 −0.014[4] R☉ |
| Surface gravity (log g) | 4.1956+0.0095 −0.013[4] cgs |
| Temperature | 6410±140[4] K |
| Metallicity [Fe/H] | -0.018+0.0072 −0.056[4] dex |
| Rotational velocity (v sin i) | 12.6 ± 1.0[5] km/s |
| Age | 3.4 ± 1 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia | data |
Planetary system
In 2008 the HATNet Project announced the discovery of extrasolar planet HAT-P-8b around this star. This planet is a hot Jupiter gas giant planet.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.354±0.035 MJ | 0.04496+0.00046 −0.00045 |
3.0763458±0.0000024 | <0.0060 | — | 1.334±0.013[4] RJ |
See also
References
- Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- "HAT-P-8". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-04-24.
- Latham, David W.; et al. (2009). "Discovery of a Transiting Planet and Eight Eclipsing Binaries in HATNet Field G205". The Astrophysical Journal. 704 (2): 1107–1119. arXiv:0812.1161. Bibcode:2009ApJ...704.1107L. doi:10.1088/0004-637X/704/2/1107. S2CID 120615043.
- Wang, Xian-Yu; et al. (1 July 2021). "Transiting Exoplanet Monitoring Project (TEMP). VI. The Homogeneous Refinement of System Parameters for 39 Transiting Hot Jupiters with 127 New Light Curves". The Astrophysical Journal Supplement Series. 255 (1). 15. arXiv:2105.14851. Bibcode:2021ApJS..255...15W. doi:10.3847/1538-4365/ac0835. S2CID 235253975.
- Torres, Guillermo; et al. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal. 757 (2). 161. arXiv:1208.1268. Bibcode:2012ApJ...757..161T. doi:10.1088/0004-637X/757/2/161. S2CID 16580774.
- Bechter, Eric B.; et al. (2014). "WASP-12b and HAT-P-8b are Members of Triple Star Systems". The Astrophysical Journal. 788 (1). 2. arXiv:1307.6857. Bibcode:2014ApJ...788....2B. doi:10.1088/0004-637X/788/1/2. S2CID 36306243.
- Mancini, L.; et al. (2013). "A lower radius and mass for the transiting extrasolar planet HAT-P-8 b". Astronomy and Astrophysics. 551. A11. arXiv:1212.3701. Bibcode:2013A&A...551A..11M. doi:10.1051/0004-6361/201220291. S2CID 118498705.
- Bonomo, A. S.; et al. (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 and Astrophysics. 602. A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882. S2CID 118923163.
External links
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