HAT-P-4

HAT-P-4
Observation data; Epoch J2000 Equinox J2000
Constellation	Boötes
Right ascension	15h 19m 57.922s
Declination	+36° 13′ 46.73″
Apparent magnitude (V)	11.0
Characteristics
Spectral type	F
B−V color index	0.771
Astrometry
Proper motion (μ)	RA: –21.9 ± 1.2 mas/yr; Dec.: –23.4 ± 0.7 mas/yr
Parallax (π)	0.2 mas
Distance	1010.6 ± 97.8 ly; (310 ± 30 pc)
Details
Mass	~ 1.26 M☉
Radius	1.59 ± 0.07 R☉
Luminosity	0.41 L☉
Surface gravity (log g)	4.14 ± 0.03 cgs
Temperature	5890 ± 67 K
Metallicity [Fe/H]	0.20 ± 0.08 dex
Rotational velocity (v sin i)	5.6 ± 0.9 km/s
Age	~4.2 Gyr
Other designations
	BD+36°2593, SAO 64638, AG+36° 1339, GSC 02569-01599, PPM 78511, TYC 2569-1599-1
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 F9-type main-sequence star in the constellation of Boötes.^[2] It is also designated BD+36°2593.

Planetary System

The HAT-P-4 planetary system^[5]^[6]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.68 ± 0.04 M_J	0.04465 ± 0.00042	3.0565254 ± 0.0000012	0	—	—

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Observation data Epoch J2000 Equinox J2000
Constellation	Boötes
Right ascension	15^h 19^m 57.922^s^[1]
Declination	+36° 13′ 46.73″^[1]
Apparent magnitude (V)	11.0^[2]
Characteristics
Spectral type	F^[2]
B−V color index	0.771
Astrometry

Proper motion (μ)	RA: –21.9 ± 1.2^[1] mas/yr Dec.: –23.4 ± 0.7^[1] mas/yr
Parallax (π)	0.2 mas
Distance	1010.6 ± 97.8 ly (310 ± 30 pc)

Details

Mass	~ 1.26 M_☉
Radius	1.59 ± 0.07 R_☉
Luminosity	0.41 L_☉
Surface gravity (log g)	4.14 ± 0.03^[3] cgs
Temperature	5890 ± 67^[3] K
Metallicity [Fe/H]	0.20 ± 0.08^[3] dex
Rotational velocity (v sin i)	5.6 ± 0.9^[3] km/s
Age	~4.2 Gyr

Other designations
BD+36°2593, SAO 64638, AG+36° 1339, GSC 02569-01599, PPM 78511, TYC 2569-1599-1
Database references
SIMBAD	data
Extrasolar Planets Encyclopaedia	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)