HAT-P-65#Planetary system
{{Short description|Star in the constellation Equuleus}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000
| constell = Equuleus
| appmag_v = {{val|13.16|0.02}}
}}
{{Starbox character
}}
{{Starbox astrometry
| radial_v = {{val|-47.77|0.10}}
| prop_mo_ra = {{val|4.175|(24)}}
| prop_mo_dec = {{val|−6.263|(16)}}
| parallax = 1.3261
| p_error = 0.0353
}}
{{Starbox detail
| mass = {{val|1.297|0.056|0.053}}
| radius = {{val|1.666|(24)}}
| luminosity = {{val|2.97|(12)}}
| gravity = {{val|4.1079|0.068|0.074}}
| temperature = {{val|5872|(40)}}
| metal_fe = {{val|0.208|0.050|0.055}}
| rotational_velocity = {{val|7.1|0.5}}
| age_gyr = {{val|3.9|(8)}}
}}
{{Starbox catalog
| names = {{odlist | 2MASS=J21033731+1159218 | Gaia DR3=1757302881526250496 | GSC=01111-00383 }}
}}
{{Starbox reference | Simbad=HAT-P-65 | NSTED=HAT-P-65 | EPE=HAT-P-65 }}
{{Starbox end}}
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 {{Convert|2460|ly|pc}} away from Earth, 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. No significant transit timing variations or evidence of orbital decay was found in a 2024 study by Kang et. al.
{{Orbitbox planet begin
}}
{{Orbitbox planet
| exoplanet = b
| mass = {{val|0.554|0.092|0.091}}
| semimajor = {{val|0.04042|0.00057|0.00055}}
| eccentricity = 0 (assumed)
| inclination = {{val|88.3|(1.0)}}
| radius = {{val|1.611|(24)}}
| period = {{val|2.60544751|(50)}}
}}
{{Orbitbox end}}