HAT-P-16
F-type main sequence star in the constellation Andromeda
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HAT-P-16 is a F-type main-sequence star about 725 light-years away. The star has a concentration of heavy elements slightly higher than solar abundance,[5] and low starspot activity.[8] The survey in 2015 have failed to find any stellar companions to it.[9] The spectral analysis in 2014 have discovered the HAT-P-16 has a carbon to oxygen molar ratio of 0.58±0.08, close to Sun`s value of 0.55.[10]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Andromeda[1] |
| Right ascension | 00h 38m 17.5584s[2] |
| Declination | +42° 27′ 47.217″[2] |
| Apparent magnitude (V) | 10.91[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F8[4] |
| Astrometry | |
| Radial velocity (Rv) | −16.67±0.42[2] km/s |
| Proper motion (μ) | RA: −21.535(12) mas/yr[2] Dec.: −4.582(12) mas/yr[2] |
| Parallax (π) | 4.4958±0.0155 mas[2] |
| Distance | 725 ± 3 ly (222.4 ± 0.8 pc) |
| Details[5][6] | |
| Mass | 1.218±0.039 M☉ |
| Radius | 1.237±0.054 R☉ |
| Luminosity | 1.97±0.22 L☉ |
| Surface gravity (log g) | 4.34±0.03 cgs |
| Temperature | 6140±72 K |
| Metallicity | 0.12±0.08 |
| Rotational velocity (v sin i) | 3.5±0.5 km/s |
| Age | 2.0±0.8 Gyr |
| Other designations | |
| TYC 2792-1700-1, GSC 02792-01700, 2MASS J00381756+4227470, Gaia DR2 3815923136483872000[7] | |
| Database references | |
| SIMBAD | data |
Planetary system
In 2010 a transiting hot superjovian planet was detected.[5] Transit-timing variation analysis in 2016 have failed to detect an additional planets in the system.[11]
In 2011 the observation utilizing a Rossiter–McLaughlin effect was performed, and the orbit of HAT-P-16b was found to be probably aligned with the equatorial plane of the star, misalignment angle equal to 10±16°.[12]
The planet HAT-P-16b equilibrium temperature was found to be equal to 1567±22 K in 2013.[6] The multiband photometry have failed to find any Rayleigh scattering in the HAT-P-16b atmosphere, which may indicate a presence of hazes or dense cloud deck.[13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | 4.221±0.092 MJ | 0.04134+0.00044 −0.00045 |
2.7759704±0.0000007 | 0.0462+0.0027 −0.0024 |
86.6±0.7 | 1.190±0.037 RJ |