HAT-P-65
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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) mas/yr[2] Dec.: −6.263(16) mas/yr[2] |
| Parallax (π) | 1.3261±0.0353 mas[2] |
| Distance | 2,460 ± 70 ly (750 ± 20 pc) |
| Details[5] | |
| Mass | 1.297+0.056 −0.053 M☉ |
| Radius | 1.666(24) R☉ |
| Luminosity | 2.97(12) L☉ |
| Surface gravity (log g) | 4.1079+0.068 −0.074 cgs |
| Temperature | 5872(40) K |
| Metallicity [Fe/H] | 0.208+0.050 −0.055 dex |
| Rotational velocity (v sin i) | 7.1±0.5[4] km/s |
| Age | 3.9(8) Gyr |
| Other designations | |
| Gaia DR3 1757302881526250496, GSC 01111-00383, 2MASS J21033731+1159218[6] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | 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
[edit]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
[edit]In 2016, an inflated hot Jupiter was discovered orbiting the star in a tight 2 day orbit.[4] No significant transit timing variations or evidence of orbital decay was found in a 2024 study by Kang et. al.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.554+0.092 −0.091 MJ |
0.04042+0.00057 −0.00055 |
2.60544751(50) | 0 (assumed) | 88.3(1.0)° | 1.611(24) RJ |
References
[edit]- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b c d e 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.
- ^ a b 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. arXiv:1212.6182. Bibcode:2013AJ....145...44Z. doi:10.1088/0004-6256/145/2/44. ISSN 0004-6256. S2CID 119299381.
- ^ a b c d 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) 182. arXiv:1609.02767. Bibcode:2016AJ....152..182H. doi:10.3847/0004-6256/152/6/182.
- ^ a b c Kang, H; et al. (2024-01-23). "Simultaneous multicolour transit photometry of hot Jupiters HAT-P-19b, HAT-P-51b, HAT-P-55b, and HAT-P-65b". Monthly Notices of the Royal Astronomical Society. 528 (2): 1930–1944. arXiv:2401.03715. Bibcode:2024MNRAS.528.1930K. doi:10.1093/mnras/stae072.
- ^ "HAT-P-65". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-02-22.
