HAT-P-30

HAT-P-30, also known as WASP-51, is the primary of a binary star system about 679 light-years away in the constellation Hydra. It is a G-type main-sequence star. HAT-P-30 has a similar concentration of heavy elements compared to the Sun.

HAT-P-30

Observation data Epoch J2000      Equinox J2000
Constellation	Hydra[1]
Right ascension	08h 15m 47.9802s[2]
Declination	+05° 50′ 12.351″[2]
Apparent magnitude (V)	10.35[3]
Characteristics
Evolutionary stage	main sequence[2]
Spectral type	G0[4]
Astrometry
Radial velocity (Rv)	45.14±0.37[2] km/s
Proper motion (μ)	RA: −17.231 mas/yr[2] Dec.: +23.875 mas/yr[2]
Parallax (π)	4.8037±0.0148 mas[2]
Distance	679 ± 2 ly (208.2 ± 0.6 pc)
Details
Mass	1.175±0.025[5] M☉
Radius	1.314±0.015[5] R☉
Luminosity	2.37±0.01[2] L☉
Surface gravity (log g)	4.270±0.007[5] cgs
Temperature	6,252±100[5] K
Metallicity [Fe/H]	−0.079±0.079[5] dex
Rotational velocity (v sin i)	3.6±0.4[6] km/s
Age	4.1±0.6[2] Gyr
Other designations
HAT-P-30, BD+06 1909, TOI-490, TIC 455135327, WASP-51, GSC 00208-00722, 2MASS J08154797+0550121[7]
Database references
SIMBAD	data
Exoplanet Archive	data

The faint stellar companion was detected in 2013 at a projected separation of 3.842±0.007″.^[8]

Planetary system

In 2011 a transiting hot Jupiter planet, HAT-P-30b, was independently detected by two teams, the HATNet Project^[9] and the Wide Angle Search for Planets (WASP).^[6]

The planetary orbit is strongly misaligned with the equatorial plane of the star, the misalignment angle being equal to 73.5±9.0°.^[9]

Since 2022, an additional planet in the system is suspected based on transit timing variations.^[5]

The HAT-P-30 planetary system^[5]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.723±0.023 MJ	0.04114±0.00030	2.8106006(4)	<0.016[10]	82.56±0.08°	1.426±0.020 RJ