HAT-P-3
Star in the constellation Ursa Major
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HAT-P-3, is a metal-rich K5 dwarf star located about 441 light-years away in the constellation Ursa Major. At a magnitude of about 11.5 it is not visible to the naked eye but is visible in a small to medium-sized amateur telescope. It is believed to be a relatively young star and has a slightly enhanced level of chromospheric activity.[7][9]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major[1] |
| Right ascension | 13h 44m 22.5937s[2] |
| Declination | +48° 01′ 43.206″[2] |
| Apparent magnitude (V) | 11.577(67)[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | K5[4] |
| Apparent magnitude (B) | 12.53(20)[5] |
| Apparent magnitude (V) | 11.577(67)[3] |
| Apparent magnitude (I) | 10.504(79)[3] |
| Apparent magnitude (J) | 9.936(22)[6] |
| Apparent magnitude (H) | 9.542(28)[6] |
| Apparent magnitude (K) | 9.448(25)[6] |
| Variable type | planetary transit[7] |
| Astrometry | |
| Radial velocity (Rv) | −23.8±0.1[7] km/s |
| Proper motion (μ) | RA: −19.619(12) mas/yr[2] Dec.: −23.973(15) mas/yr[2] |
| Parallax (π) | 7.4159±0.0143 mas[2] |
| Distance | 439.8 ± 0.8 ly (134.8 ± 0.3 pc) |
| Absolute magnitude (MV) | 5.87(15)[8] |
| Details | |
| Mass | 0.925+0.031 −0.0134[4] M☉ |
| Radius | 0.850+0.021 −0.010[4] R☉ |
| Luminosity | 0.435(53)[8] L☉ |
| Surface gravity (log g) | 4.58(10)[4] cgs |
| Temperature | 5,190(80)[4] K |
| Metallicity [Fe/H] | 0.24(8)[4] dex |
| Rotational velocity (v sin i) | 1.4(5)[4] km/s |
| Age | 2.9+1.7 −3.7[4] Myr |
| Other designations | |
| Dombay, TOI-1419, TIC 311035838, TYC 3466-819-1, GSC 03466-00819, 2MASS J13442258+4801432, HAT-P-3[5] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
The star HAT-P-3 is named Dombay. The name was selected in the NameExoWorlds campaign by Russia, during the 100th anniversary of the IAU. Dombay is a resort region in the North Caucasus mountains.[10][11]
Planetary system
This star is home to the extrasolar planet HAT-P-3b, later named Teberda, discovered by the HATNet Project using the transit method.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Teberda | 0.609+0.021 −0.022 MJ |
0.03899+0.00062 −0.00065 |
2.8997360±0.0000020 | <0.0100 | 87.07 ± 0.55° | 0.827 ± 0.055 RJ |
