Registry · exoplanet

HAT-P-4 b

Exoplanet

harvesting The full record is being pulled from the archives right now — measurement tables, the Gaia row, catalogue photometry. This page will fill itself in.

Right ascension: 15h 19m 57.89s
Declination: +36° 13′ 46.4″
Galactic l, b: 58.48, 57.34
Magnitude V: 11.12
Distance: 320.45 pc

Planet

NASA Exoplanet Archive, composite parameters

Host star	HAT-P-4 · F
Discovery	Transit, 2007 · HATNet
Orbital period	3.05654 d
Semi-major axis	0.04438 au
Eccentricity	0
Radius	14.28 R⊕ · 1.274 R♃
Mass	213.25 M⊕ · 0.671 M♃
Density	0.403 g/cm³
Equilibrium temperature	1,686 K
System distance	320.45 pc

Published measurements

6 quantities measured more than once

One object can carry a dozen published estimates of the same quantity. The register keeps them side by side rather than picking a winner — the citation is part of the value.

Mass 8 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
208.1787	M_earth	± 14.3	Transit	NASA Exoplanet Archive	Ment et al. 2018	2018
206.9073	M_earth	± 10.49	Transit	NASA Exoplanet Archive	Bonomo et al. 2017	2017
203.0934	M_earth	± 13.67	Transit	NASA Exoplanet Archive	Knutson et al. 2014	2014
176.7135	M_earth	± 21.61	Transit	NASA Exoplanet Archive	Winn et al. 2011	2011
216.12	M_earth	± 12.71	Transit	NASA Exoplanet Archive	Christiansen et al. 2011	2011
216.1244	M_earth	± 14.62	Transit	NASA Exoplanet Archive	Southworth 2011	2011
213.255	M_earth	± 10.49	Transit	NASA Exoplanet Archive	Torres et al. 2008	2008
216.1244	M_earth	± 12.71	Transit	NASA Exoplanet Archive	Kovacs et al. 2007	2007

Radius 7 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
14.28027	R_earth	± 0.5492	Transit	NASA Exoplanet Archive	Bonomo et al. 2017	2017
15.3227	R_earth	± 0.5829	Transit	NASA Exoplanet Archive	Winn et al. 2011	2011
14.93	R_earth	± 0.583	Transit	NASA Exoplanet Archive	Christiansen et al. 2011	2011
14.98643	R_earth	± 0.8855	Transit	NASA Exoplanet Archive	Southworth 2011	2011
14.28	R_earth	± 0.549	Transit	NASA Exoplanet Archive	Torres et al. 2008	2008
15.1633	R_earth	± 0.7052	Transit	NASA Exoplanet Archive	ExoFOP	2007
14.23543	R_earth	± 0.5605	Transit	NASA Exoplanet Archive	Kovacs et al. 2007	2007

Orbital period 11 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
3.056523	d	± 2.90e-07	Transit	NASA Exoplanet Archive	Kokori et al. 2023	2023
3.056523	d	± 6.00e-07	Transit	NASA Exoplanet Archive	Kokori et al. 2022	2022
3.056524	d	± 3.60e-07	Transit	NASA Exoplanet Archive	Ivshina & Winn 2022	2022
3.056328	d	± 2.80e-05	Transit	NASA Exoplanet Archive	Ment et al. 2018	2018
3.056525	d	± 1.20e-06	Transit	NASA Exoplanet Archive	Bonomo et al. 2017	2017
3.056519	d	± 2.50e-06	Transit	NASA Exoplanet Archive	Winn et al. 2011	2011
3.056511	d	± 2.80e-06	Transit	NASA Exoplanet Archive	Christiansen et al. 2011	2011
3.056519	d	± 2.50e-06	Transit	NASA Exoplanet Archive	Southworth 2011	2011
3.056536	d		Transit	NASA Exoplanet Archive	Torres et al. 2008	2008
3.056526	d	± 2.60e-06	Transit	NASA Exoplanet Archive	ExoFOP	2007
3.056536	d	± 5.70e-05	Transit	NASA Exoplanet Archive	Kovacs et al. 2007	2007

Semi-major axis 5 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.0445	au	± 0.0012	Transit	NASA Exoplanet Archive	Ment et al. 2018	2018
0.04449	au	± 0.00083	Transit	NASA Exoplanet Archive	Bonomo et al. 2017	2017
0.04465	au	± 0.00141	Transit	NASA Exoplanet Archive	Southworth 2011	2011
0.04438	au	± 0.00081	Transit	NASA Exoplanet Archive	Torres et al. 2008	2008
0.0446	au	± 0.0012	Transit	NASA Exoplanet Archive	Kovacs et al. 2007	2007

Eccentricity 7 values

Value	Uncertainty	Band / method	Source	Reference	Year
0.084	± 0.014	Transit	NASA Exoplanet Archive	Ment et al. 2018	2018
0.0073		Transit	NASA Exoplanet Archive	Bonomo et al. 2017	2017
0.004	± 0.017	Transit	NASA Exoplanet Archive	Knutson et al. 2014	2014
0		Transit	NASA Exoplanet Archive	Winn et al. 2011	2011
0		Transit	NASA Exoplanet Archive	Christiansen et al. 2011	2011
0		Transit	NASA Exoplanet Archive	Torres et al. 2008	2008
0		Transit	NASA Exoplanet Archive	Kovacs et al. 2007	2007

Equilibrium temperature 3 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
1,691	K	± 46	Transit	NASA Exoplanet Archive	Southworth 2011	2011
1,686	K	± 30	Transit	NASA Exoplanet Archive	Torres et al. 2008	2008
1,715	K		Transit	NASA Exoplanet Archive	ExoFOP	2007

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
HAT-P-4	Star	0″	—
BD+36 2593b	Planet	0.5026″	—
BD+36 2593	EmLine*	0.5026″	11.12
SDSS J151957.61+361239.7	QSO	66.75″	—
TYC 2569-744-1	Star	91.51″	11.38
[VV2006] J151949.3+361126	QSO	174.2″	20.65
BD+36 2594	RGB*	262.1″	11.55
2MASS J15195206+3608397	Star	314.6″	—
2MASS J15192273+3611514	Star	440.9″	—
BD+36 2592	RGB*	466.6″	10.38
[VV2006] J151932.0+362024	QSO	507.1″	18.98

Provenance

where this card came from

Archive	Read at (UTC)	Record
Seeded from the bulk archive load; no per-object fetch yet.

Machine-readable: /api/v1/object/hat-p-4-b · Registry entry updated 2026-08-14.