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 | |
Radial velocity (Rv) | −1.13(37) [2] km/s |
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 | |
Radial velocity (Rv) | −1.31(35) [4] km/s |
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 |
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 | |
Radial velocity (Rv) | −1.13(37) [2] km/s |
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 | |
Radial velocity (Rv) | −1.31(35) [4] km/s |
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 |