| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Boötes |
| Right ascension | 15h 19m 57.9275s[1] |
| Declination | +36° 13′ 46.785″[1] |
| Apparent magnitude (V) | 11.0[1] |
| Characteristics | |
| Spectral type | G[1] |
| B−V color index | 0.771 |
| Astrometry | |
| Proper motion (μ) | RA: -14.1 ± 3.7[1] mas/yr Dec.: -20.1 ± 2.1[1] mas/yr |
| Parallax (π) | 0.2 mas |
| Distance | 1010.6 ± 97.8 ly (310 ± 30 pc) |
| Absolute magnitude (MV) | 11.7 |
| Details | |
| Mass | ~ 1.26 M☉ |
| Radius | 1.59 ± 0.07 R☉ |
| Surface gravity (log g) | ~13,92 g |
| Luminosity | 0.41 L☉ |
| Temperature | 5860 ± 80 K |
| Metallicity | 24 ± 8 % |
| Age | ~4.2 G years |
| Equatorial [ g ] | ~136,5 m/s2 |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia |
data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
HAT-P-4 is a yellow dwarf star in the constellation of Boötes.[1] It is also designated BD+36°2593.
Contents |
This star is home to the transiting extrasolar planet HAT-P-4b.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| b | 0.68 ± 0.04 MJ | 0.0446 ± 0.0012 | 3.056536 ± 0.000057 | 0 |