Astronomy:HAT-P-65
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Short description: Star in the constellation Equuleus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Equuleus[1] |
| Right ascension | 21h 03m 37.3131s[2] |
| Declination | +11° 59′ 21.820″[2] |
| Apparent magnitude (V) | 13.16±0.02[3] |
| Characteristics | |
| Spectral type | G2IV[4] |
| B−V color index | +0.65[3] |
| Astrometry | |
| Radial velocity (Rv) | −47.77±0.10[4] km/s |
| Proper motion (μ) | RA: 4.175(24)[2] mas/yr Dec.: −6.263(16)[2] mas/yr |
| Parallax (π) | 1.3261 ± 0.0353[2] mas |
| Distance | 2,460 ± 70 ly (750 ± 20 pc) |
| Details[4] | |
| Mass | 1.21±0.05 M☉ |
| Radius | 1.86±0.10 R☉ |
| Luminosity | 2.71±0.14[5] L☉ |
| Surface gravity (log g) | 4.03+0.08 −0.07[6] cgs |
| Temperature | 5916+107 −138[6] K |
| Metallicity [Fe/H] | 0.10±0.08 dex |
| Rotational velocity (v sin i) | 7.1±0.5 km/s |
| Age | 5.46±0.61 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HAT-P-65 is a faint star located in the equatorial constellation Equuleus. With an apparent magnitude of 13.16, it requires a telescope to be seen. The star is located 2,460 light-years (750 pc) away from Earth,[2] but is drifting close with a radial velocity of -48 km/s.
Properties
HAT-P-65 has a similar spectral type to that of the Sun. However, it is 21% more massive, and 86% larger than the latter. HAT-P-65 is slightly hotter, with an effective temperature of 5,916 K compared to 5,778 K of the Sun. It also has a higher luminosity and metallicity, with an iron content 26% greater than the Sun.
Planetary system
In 2016, an inflated hot Jupiter was discovered orbiting the star in a tight 2 day orbit. As of 2019, the planet has been suffering orbital decay due to its proximity.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.53±0.09 MJ | 0.04±0.00 | 2.61±0.00 | <0.304 | 84.2±1.3° | 1.89±0.13 RJ |
References
- ↑ Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific 99 (617): 695–699. doi:10.1086/132034. Bibcode: 1987PASP...99..695R. Vizier query form
- ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (1 February 2013). "The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". The Astronomical Journal 145 (2): 44. doi:10.1088/0004-6256/145/2/44. ISSN 0004-6256. Bibcode: 2013AJ....145...44Z. https://ui.adsabs.harvard.edu/abs/2013AJ....145...44Z/abstract.
- ↑ 4.0 4.1 4.2 4.3 Hartman, J. D. et al. (1 December 2016). "HAT-P-65b and HAT-P-66b: Two Transiting Inflated Hot Jupiters and Observational Evidence for the Reinflation of Close-in Giant Planets". The Astronomical Journal 152 (6). doi:10.3847/0004-6256/152/6/182. Bibcode: 2016AJ....152..182H.
- ↑ 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.
- ↑ 6.0 6.1 Stassun, Keivan G.; Oelkers, Ryan J.; Paegert, Martin; Torres, Guillermo; Pepper, Joshua; De Lee, Nathan; Collins, Kevin; Latham, David W. et al. (1 October 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S.
- ↑ "HAT-P-65". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-65.
- ↑ Alvarado-Montes, Jaime A; García-Carmona, Carolina (2019-07-01). "Orbital decay of short-period gas giants under evolving tides" (in en). Monthly Notices of the Royal Astronomical Society 486 (3): 3963–3974. doi:10.1093/mnras/stz1081. ISSN 0035-8711. https://academic.oup.com/mnras/article/486/3/3963/5470968.
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