Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes[1] |
HAT-P-4A | |
Right ascension | 15h 19m 57.9204s[2] |
Declination | +36° 13′ 46.738″[2] |
Apparent magnitude (V) | 11.159±0.010[3] |
HAT-P-4B | |
Right ascension | 15h 20m 00.0127s[4] |
Declination | +36° 12′ 18.520″[4] |
Apparent magnitude (V) | 11.534±0.01[3] |
Characteristics | |
HAT-P-4A | |
Spectral type | G0V[5] |
B−V color index | 0.771 |
Variable type | planetary transit[6] |
HAT-P-4B | |
Spectral type | G2V[5] |
Astrometry | |
HAT-P-4A | |
Proper motion (μ) | RA: −21.513(13) mas/yr[2] Dec.: −24.255(19) mas/yr[2] |
Parallax (π) | 3.1071 ± 0.0154 mas[2] |
Distance | 1,050 ± 5 ly (322 ± 2 pc) |
HAT-P-4B | |
Proper motion (μ) | RA: −21.424(13) mas/yr[4] Dec.: −24.182(20) mas/yr[4] |
Parallax (π) | 3.0777 ± 0.0155 mas[4] |
Distance | 1,060 ± 5 ly (325 ± 2 pc) |
Details | |
HAT-P-4A | |
Mass | 1.260+0.043 −0.042[7] M☉ |
Radius | 1.573±0.015[7] R☉ |
Luminosity | 0.41 L☉ |
Surface gravity (log g) | 4.145±0.015[7] cgs |
Temperature | 5927+57 −47[7] K |
Metallicity [Fe/H] | 0.277±0.007[8] dex |
Rotational velocity (v sin i) | 5.6 ± 0.9[9] km/s |
Age | ~4.2 Gyr |
HAT-P-4B | |
Surface gravity (log g) | 4.38±0.14[8] cgs |
Temperature | 6037±37[8] K |
Metallicity [Fe/H] | 0.175±0.006[8] dex |
Position (relative to HAT-P-4A)[5] | |
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[10] | |
HAT-P-4B: Gaia DR3 1291119606434912384, TYC 2569-744-1, 2MASS J15200001+3612185[11] | |
Database references | |
SIMBAD | data |
Data sources: | |
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
HAT-P-4 is a wide binary star consisting of a pair of G-type main-sequence stars[5] in the constellation of Boötes.[1] It is also designated BD+36°2593.
The star exhibits an infrared excess noise of unknown origin.[12]
The primary star is home to the transiting extrasolar planet HAT-P-4b.[6] This planet is a fairly typical hot Jupiter type planet in a 3-day orbit.[6]
The companion star is located at a distance of 28446 astronomical units and therefore has an orbital period that is extremely long.[5]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 0.651+0.033 −0.037 MJ |
0.04449+0.00083 −0.0012 |
3.0565254±0.0000012 | <0.0073 | — | 1.28+0.016 −0.015[7] RJ |