HAT-P-4
HAT-P-4 is a wide binary star consisting of a pair of G-type main-sequence stars in the constellation of Boötes. It is also designated BD+36°2593.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| HAT-P-4A | |
| Right ascension | 15h 19m 57.9204s |
| Declination | +36° 13′ 46.738″ |
| Apparent magnitude (V) | 11.159±0.010 |
| HAT-P-4B | |
| Right ascension | 15h 20m 00.0127s |
| Declination | +36° 12′ 18.520″ |
| Apparent magnitude (V) | 11.534±0.01 |
| Characteristics | |
| HAT-P-4A | |
| Spectral type | G0V |
| B−V color index | 0.771 |
| Variable type | planetary transit |
| HAT-P-4B | |
| Spectral type | G2V |
| Astrometry | |
| HAT-P-4A | |
| Proper motion (μ) | RA: −21.513(13) mas/yr Dec.: −24.255(19) mas/yr |
| Parallax (π) | 3.1071 ± 0.0154 mas |
| Distance | 1,050 ± 5 ly (322 ± 2 pc) |
| HAT-P-4B | |
| Proper motion (μ) | RA: −21.424(13) mas/yr Dec.: −24.182(20) mas/yr |
| Parallax (π) | 3.0777 ± 0.0155 mas |
| Distance | 1,060 ± 5 ly (325 ± 2 pc) |
| Details | |
| HAT-P-4A | |
| Mass | 1.260+0.043 −0.042 M☉ |
| Radius | 1.573±0.015 R☉ |
| Luminosity | 0.41 L☉ |
| Surface gravity (log g) | 4.145±0.015 cgs |
| Temperature | 5927+57 −47 K |
| Metallicity [Fe/H] | 0.277±0.007 dex |
| Rotational velocity (v sin i) | 5.6 ± 0.9 km/s |
| Age | ~4.2 Gyr |
| HAT-P-4B | |
| Surface gravity (log g) | 4.38±0.14 cgs |
| Temperature | 6037±37 K |
| Metallicity [Fe/H] | 0.175±0.006 dex |
| Position (relative to HAT-P-4A) | |
| Component | HAT-P-4B |
| Epoch of observation | 1999/02/07 |
| Angular distance | 91.760±0.099″ |
| Position angle | 163.97±0.06° |
| Projected separation | 28446 AU |
| Other designations | |
| HAT-P-4A: BD36°2593, Gaia DR3 1291120362349158016, SAO 64638, TYC 2569-1599-1, GSC 02569-01599, 2MASS J15195792+3613467 | |
| HAT-P-4B: Gaia DR3 1291119606434912384, TYC 2569-744-1, 2MASS J15200001+3612185 | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
The star exhibits an infrared excess noise of unknown origin.
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