Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 00h 38m 17.5584s[1] |
Declination | +42° 27′ 47.217″[1] |
Apparent magnitude (V) | 10.91 |
Characteristics | |
Spectral type | F8V |
Astrometry | |
Radial velocity (Rv) | -15.51 km/s |
Proper motion (μ) | RA: −21.535(12) mas/yr[1] Dec.: −4.582(12) mas/yr[1] |
Parallax (π) | 4.4958 ± 0.0155 mas[1] |
Distance | 725 ± 3 ly (222.4 ± 0.8 pc) |
Details[2][3] | |
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 | |
Database references | |
SIMBAD | data |
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,[2] and low starspot activity.[5] The survey in 2015 have failed to find any stellar companions to it.[6] 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.[7]
In 2010 a transiting hot superjovian planet was detected.[2] Transit-timing variation analysis in 2016 have failed to detect an additional planets in the system.[8]
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°.[9]
The planet HAT-P-16b equilibrium temperature was found to be equal to 1567±22 K in 2013.[3] 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.[10]
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 |