HAT-P-3
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.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 13h 44m 22.5937s |
| Declination | +48° 01′ 43.206″ |
| Apparent magnitude (V) | 11.577(67) |
| Characteristics | |
| Spectral type | K5 |
| Apparent magnitude (B) | 12.53(20) |
| Apparent magnitude (V) | 11.577(67) |
| Apparent magnitude (I) | 10.504(79) |
| Apparent magnitude (J) | 9.936(22) |
| Apparent magnitude (H) | 9.542(28) |
| Apparent magnitude (K) | 9.448(25) |
| Variable type | planetary transit |
| Astrometry | |
| Radial velocity (Rv) | −23.8±0.1 km/s |
| Proper motion (μ) | RA: −19.619(12) mas/yr Dec.: −23.973(15) mas/yr |
| Parallax (π) | 7.4159 ± 0.0143 mas |
| Distance | 439.8 ± 0.8 ly (134.8 ± 0.3 pc) |
| Absolute magnitude (MV) | 5.87(15) |
| Details | |
| Mass | 0.925+0.031 −0.0134 M☉ |
| Radius | 0.850+0.021 −0.010 R☉ |
| Luminosity | 0.435(53) L☉ |
| Surface gravity (log g) | 4.58(10) cgs |
| Temperature | 5,190(80) K |
| Metallicity [Fe/H] | 0.24(8) dex |
| Rotational velocity (v sin i) | 1.4(5) km/s |
| Age | 2.9+1.7 −3.7 Myr |
| Other designations | |
| Database references | |
| SIMBAD | 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.
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