HAT-P-19
Star in the constellation Andromeda
From Wikipedia, the free encyclopedia
HAT-P-19 is a K-type main-sequence star about 658 light-years away. The star is old yet metal-enriched, having amount of heavy elements 250% of solar abundance.[5] A survey in 2012 failed to find any stellar companions to HAT-P-19.[7]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda[1] |
| Right ascension | 00h 38m 04.0136s[2] |
| Declination | +34° 42′ 41.554″[2] |
| Apparent magnitude (V) | 12.901[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | K1V[3] |
| Astrometry | |
| Radial velocity (Rv) | −19.61±0.66[2] km/s |
| Proper motion (μ) | RA: −26.745(11) mas/yr[2] Dec.: −32.568(10) mas/yr[2] |
| Parallax (π) | 4.9567±0.0137 mas[2] |
| Distance | 658 ± 2 ly (201.7 ± 0.6 pc) |
| Details[4] | |
| Mass | 0.863+0.029 −0.025 M☉ |
| Radius | 0.851±0.013 R☉ |
| Luminosity | 0.37+0.08 −0.06[5] L☉ |
| Surface gravity (log g) | 4.514+0.019 −0.017 cgs |
| Temperature | 5049+42 −65 K |
| Metallicity | 0.283+0.081 −0.079 |
| Rotation | 14.66±0.03 d[5] |
| Rotational velocity (v sin i) | 0.7±0.5[5] km/s |
| Age | 8.8±5.2[5] Gyr |
| Other designations | |
| 2MASS J00380401+3442416, Gaia DR2 3654266795168165128[6] | |
| Database references | |
| SIMBAD | data |
Planetary system
In 2010 a transiting hot Saturn-sized planet was detected.[3] Its equilibrium temperature is 984±10 K,[8] and it is grey in color.[9]
The transit-timing variation measurements in 2015 and 2018 did not detect additional planets in the system.[10][11]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | 0.290±0.016 MJ | 0.04649± | 4.00878236+0.00000050 −0.00000049 |
0.084±0.041 | 88.67+0.41 −0.25 |
1.089±0.018 RJ |