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 | |
Gaia DR2 3654266795168165128, 2MASS J00380401+3442416 [6] | |
Database references | |
SIMBAD | data |
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]
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 |