HAT-P-25

HAT-P-25 is a G-type main-sequence star about 990 light-years away. It has a very low flare activity.[3] The star is enriched in heavy elements, having about twice amount of metals compared to solar abundance.

HAT-P-25
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension  03h 10m 47.4136016557s[1]
Declination +25° 00′ 41.677262346″[1]
Apparent magnitude (V) 13.15[1]
Characteristics
Spectral type G5V
Astrometry
Proper motion (μ) RA: 13.49 mas/yr
Dec.: -13.586 mas/yr
Parallax (π)3.3009 ± 0.0466[1] mas
Distance990 ± 10 ly
(303 ± 4 pc)
Details[2]
Mass1.012+0.051
−0.051 M☉
Radius0.919±0.034 R☉
Surface gravity (log g)4.516+0.026
−0.025 cgs
Temperature5519+78
−76 K
Metallicity0.29±0.08
Age3.2±2.3 Gyr
Other designations
Gaia DR2 3668036348641580288, TYC 320-1027-1, GSC 0320-01027, 2MASS J14123753+0403359[1]
Database references
SIMBADdata

Planetary system

In 2010 a transiting hot Jupiter like planet was detected.[4] It has an equilibrium temperature of 1182±25 K.[2] The stability of orbits within circumstellar habitable zone is not significantly affected by the HAT-P-25b planet.[5]

Size comparison of HAT-P-25 b and Jupiter
The HAT-P-25 planetary system[4][2]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.569+0.023
−0.022 MJ		 0.0466±0.0005 3.65281514+0.00000076
−0.00000075		 0.023+0.022
−0.014		 87.6±0.5° 1.135±0.048 RJ

References
  1. HAT-P-25 -- Star
  2. Transiting Exoplanet Monitoring Project (TEMP). IV. Refined System Parameters, Transit Timing Variations and Orbital Stability of the Transiting Planetary System HAT-P-25, 2018, arXiv:1805.01580
  3. Evgenya L. Shkolnik, "AN ULTRAVIOLET INVESTIGATION OF ACTIVITY ON EXOPLANET HOST STARS", 2013
  4. HAT-P-25b: a Hot-Jupiter Transiting a Moderately Faint G Star, 2010, arXiv:1008.3565
  5. Nikolaos Georgakarakos, Siegfried Eggl, and Ian Dobbs-Dixon, "Giant Planets: Good Neighbors for Habitable Worlds?", 2018


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