WASP-4

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
WASP-4
WASP-4 b	1.34 d	15.12 R_⨁	Transit	2007	Wilson et al. 2008	Confirmed Planet

Exoplanet Archive Notes (3)

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WASP-4 b

Inclination value/uncertainties estimated from range given in ref. (Southworth et al. 2009)
Values for transit midpoint and period drawn from Table 4, Constant period model in ref. Orbital period displays non-linear ephemeris. (Bouma et al. 2019)
Orbital period and mid-transit time updated by author via private communication. (Sodickson & Grunblatt 2025)

WASP-4 Stellar Parameters (19 Solutions)

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RA: 23h34m15.10s

Dec: -42d03m42.41s

Distance: 267.206+3.771-3.670
pc

Parallax: 3.7145100±0.0517115 mas

Ecliptic Latitude: -35.55903 deg

Ecliptic Longitude: 335.07051 deg

Galactic Latitude: -68.29575 deg

Galactic Longitude: 344.4924 deg

Total Proper Motion: 88.0729150±0.0479378 mas/yr

Proper Motion (RA): 9.873730±0.052658 mas/yr

Proper Motion (Dec): -87.5177000±0.0478747 mas/yr

Photometry: m_V
12.483±0.041; m_TESS
11.8295±0.0060; m_J
11.179±0.025; m_H
10.842±0.026; m_Ks
10.746±0.021; m_W1
10.684±0.022; m_W2
10.748±0.020; m_W3
10.721±0.089; m_W4
8.465; m_Gaia
12.316200±0.000246; m_B
13.514±0.477

Abundances (Hypatia Catalog): [Fe/H] 0.04±0.12 dex; [C/H] 0.01±0.03 dex; [O/H] -0.13±0.04 dex; [Na/H] 0.02±0.12 dex; [Mg/H] 0.07±0.08 dex; [Al/H] 0.02±0.06 dex; [Si/H] 0.01±0.02 dex; [Ca/H] 0.04±0.02 dex; [Y/H] 0.07±0.08 dex

Tools: Planetary Systems; ExoFOP Target Overview Page; IRSA Finding Chart; TOI; Stellar Hosts

Source	Baştürk et al. 2025	Baluev et al. 2020	TICv8	Bouma et al. 2019	Gaia DR2	Bonomo et al. 2017	Stassun et al. 2017	Knutson et al. 2014	Petrucci et al. 2013	Mortier et al. 2013	Hoyer et al. 2013	Southworth 2012	Triaud et al. 2010	Southworth 2010	Southworth et al. 2009	Winn et al. 2009	Gillon et al. 2009	Wilson et al. 2008	ExoFOP
T_eff (K)	---	---	5504.000+125.770-154.204	5400±90	5425.0+32.0-38.0	5436±34	5500±150	---	5436±34	5513±43	---	5540±55	5500±100	5500±100	5500±100	5500±100	---	---	5436
L_✶ (log₁₀(L_⦿))	---	---	-0.1789707+0.0211464-0.0174617	---	-0.1812056+0.0081609-0.0083173	---	---	---	---	---	---	---	---	---	---	-0.166±0.043	---	---	---
v sin i (km/s)	---	1.970±0.260	---	---	---	2.2+0.6-1.0	---	---	---	---	---	---	2.14+0.38-0.35	---	---	2.0±1.0	---	2.2 +0.6-1.0	---
M_✶ (M_⦿)	0.899+0.033-0.031	0.93	0.97000000+0.15045500-0.09498920	0.864+0.084-0.090	---	0.89±0.01	0.87±0.53	0.92±0.07	0.89±0.01	0.89±0.07	---	0.927±0.056	0.930+0.054-0.053	0.914±0.071	0.9400+0.0730-0.0690	0.925±0.040	---	---	---
R_✶ (R_⦿)	0.912±0.007	0.9019±0.0047	0.8949740+0.0464452-0.0646603	0.893±0.034	0.9188621+0.0130091-0.0107449	0.920±0.060	0.900±0.180	---	0.92±0.06	0.91±0.09	0.907±0.014	0.910±0.019	0.903+0.016-0.019	0.905+0.023-0.024	0.914+0.024-0.023	0.912±0.013	---	---	0.894973993301392±0.055552800000000
Metallicity (dex)	---	---	-0.010±0.100 [M/H]	-0.070±0.190 [Fe/H]	---	-0.050±0.040 [Fe/H]	0.0 [Fe/H]	0.0±0.2 [Fe/H]	-0.05±0.04 [Fe/H]	0.03±0.03 [Fe/H]	---	-0.030±0.090 [Fe/H]	-0.030±0.090 [Fe/H]	-0.030±0.090 [Fe/H]	-0.030±0.090 [M/H]	---	---	---	---
Age (Gyr)	---	---	---	7	---	7.0±2.9	---	---	7.0±2.9	---	---	6.4+3.3-5.6	---	7.00+5.60-4.80	---	---	---	---	---
ρ_✶ (g/cm³)	1.671+0.049-0.045	1.788±0.028	1.9076783+0.4102862-0.5566586	1.711+0.022-0.048	---	---	1.69±0.15	---	---	1.23±0.02	---	1.733±0.031	1.7844+0.0118-0.0108	1.737+0.028-0.031	1.737+0.028-0.031	---	---	---	---
log g (log₁₀(cm/s²))	4.472+0.013-0.012	---	4.5212200+0.0624677-0.1119340	4.47±0.11	---	---	4.45±0.02	---	4.461±0.054	4.50±0.07	---	4.487±0.010	4.5±0.2	4.485+0.012-0.013	4.490+0.013-0.012	---	---	---	4.46024
γ (km/s)	---	---	---	---	58.83896939662856±0.97418284578370	---	---	---	---	---	---	---	---	---	---	---	57.7387±0.0026	57.7326 +0.002-0.001	---
Sp. T	---	---	---	---	---	---	---	---	---	---	---	---	G8	---	---	---	---	G7 V	---
P_rot (days)	---	---	---	---	---	22.2±3.3	---	---	---	---	---	---	---	---	---	---	---	---	---

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WASP-4 b Planetary Parameters (22 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity, Transit, Transit Timing Variations

Tools: Planetary Systems; Transit Prediction Service; TOI; Transit; Atmospheric Spectroscopy

Source	Baştürk et al. 2025	Winn & Stefánsson 2025	Sodickson & Grunblatt 2025	Kokori et al. 2023	Patel & Espinoza 2022	Ivshina & Winn 2022	Kokori et al. 2022	Baluev et al. 2020	Bouma et al. 2019	Huitson et al. 2017	Bonomo et al. 2017	Stassun et al. 2017	Baluev et al. 2015	Knutson et al. 2014	Petrucci et al. 2013	Hoyer et al. 2013	Southworth 2012	Sanchis-Ojeda et al. 2011	Triaud et al. 2010	Southworth 2010	Southworth et al. 2009	ExoFOP
ω (deg)	---	---	---	---	---	---	---	247±28	---	---	---	---	---	288+140-21	---	---	---	---	---	---	---	---
M_p (M_⨁)	381.4+10.2-9.5	---	---	---	---	---	---	380.57±2.16	376.9+28.6-31.1	---	371.9±4.8	375±153	---	368.4+20.0-20.3	386.5±4.1	---	397.0±16.5	393.139±20.340	397.3+15.9-16.2	393.2+20.7-21.0	409.7+31.1-23.2	---
M_p (M_Jup)	1.200+0.032-0.030	---	---	---	---	---	---	1.1974±0.0068	1.186+0.090-0.098	---	1.170±0.015	1.18±0.48	---	1.159+0.063-0.064	1.216±0.013	---	1.249±0.052	1.237±0.064	1.250+0.050-0.051	1.237+0.065-0.066	1.289+0.098-0.073	---
e	---	---	---	---	---	---	---	0.0053±0.0038	0	---	<0.0033	0.0	---	0.00340+0.00740-0.00260	0	0	---	0.0	<0.0182	---	---	---
K (m/s)	---	237.6±2.6	---	---	---	---	---	---	241.1+2.8-3.1	---	232.7+2.5-2.2	240.0±3.0	---	234.6+2.2-2.3	---	---	242.1±3.0	---	242.1+2.8-3.1	242.1+2.8-3.1	247.6+13.9-6.8	---
a/R_✶	5.411+0.053-0.050	---	---	5.451+0.023-0.052	5.41+0.04-0.05	---	---	---	5.451+0.023-0.052	5.410+0.031-0.030	---	5.43±0.16	---	---	---	5.463+0.025-0.020	5.4795+0.0302-0.0328	---	5.53128+0.01227-0.01130	5.4795+0.0302-0.0328	5.480+0.030-0.033	---
T_eq (K)	1653±12	---	---	---	---	---	---	---	---	1700	---	---	---	---	1664±54	---	1673±17	---	---	1661±30	1662±46	1497.54774441597
i (deg)	88.05+0.85-0.53	---	---	89.1+0.7-0.8	---	---	---	88.87±0.39	89.06+0.65-0.84	87.63+0.32-0.28	86.8±1.8	89.47±0.38	---	---	86.85±1.76	88.52+0.39-0.26	89.0±1.0	88.80 +0.61-0.43	89.47+0.51-0.24	89.0±1.0	89.0±1.0	---
P (days)	1.338230994±0.000000084	1.338231395+0.000000023-0.000000024	1.3382313636055310±0.0000000132667195	1.338231388±0.000000022	1.3382315±0.0000000	1.338231371±0.000000024	1.33823144±0.00000003	1.338231602±0.000000056	1.338231466+0.000000023-0.000000022	1.33823204	1.338231624±0.000000068	1.3382300±0.0000022	1.338231624±0.000000068	---	1.33823251±0.00000031	1.33823204±0.00000016	1.33823144±0.00000032	1.33823187±0.00000025	1.3382299+0.0000023-0.0000021	1.33823150±0.00000061	1.33823150±0.00000061	1.33823135800679±0.00000025444777
ρ (g/cm³)	0.647+0.017-0.015	---	---	---	---	---	---	---	---	---	0.61+0.30-0.18	---	---	---	---	---	0.612±0.020	0.774±0.048	---	0.65835+0.02128-0.02527	0.665+0.032-0.022	---
R_p (R_⨁)	15.12+0.12-0.13	---	---	---	---	---	---	15.520±0.099	14.81±0.44	---	14.9±1.8	14.9±3.0	---	---	14.9±1.8	15.64±0.25	15.29±0.33	15.838±0.224	15.03+0.26-0.33	15.21+0.40-0.39	15.37+0.43-0.39	14.854260201302±0.923353430000
R_p (R_Jup)	1.349+0.011-0.012	---	---	---	---	---	---	1.3846±0.0088	1.321±0.039	---	1.33±0.16	1.33±0.27	---	---	1.33±0.16	1.395±0.022	1.364±0.029	1.413±0.020	1.341+0.023-0.029	1.357+0.036-0.035	1.371+0.038-0.035	1.3252106144943±0.0823762173130
a (au)	0.02261+0.00036-0.00027	---	---	---	---	---	---	---	0.0226+0.0007-0.0008	---	0.022870±0.000090	---	---	---	---	---	0.02318±0.00046	0.02312±0.00033	0.02320+0.00044-0.00045	0.02307±0.00059	0.02329+0.00077-0.00035	---
T_C (days)	---	2456180.558717±0.000033 (BJD-TDB)	2455804.5156791317277±0.0000149298165 (BJD)	2456139.073560±0.000024 (BJD-TDB)	2459112.62345±0.00005 (BJD)	2456576.675079±0.000031 (BJD-TDB)	2455880.79492±0.00003 (BJD-TDB)	2455937.080285±0.000039 (BJD-TDB)	2455804.515752±0.000019 (BJD-TDB)	2456924.61561187±0.00006000 (BJD-TDB)	2454966.782814±0.000021 (BJD-TDB)	---	2454966.782814±0.000021 (BJD-TDB)	---	2454697.797973±0.000076 (BJD-TDB)	2454823.591924±0.000028 (BJD-TT)	---	2454697.798226±0.000048 (BJD-TDB)	2454387.327787+0.000040-0.000039 (BJD)	---	2454697.797488±0.000031 (HJD)	2458355.18442100±0.00005207 (BJD)
R_p/R_✶	0.15205+0.00060-0.00062	---	---	0.1520±0.0004	0.1512+0.0010-0.0009	---	---	---	0.15201+0.00040-0.00033	---	---	---	0.15495±0.00032	---	---	0.15445±0.00025	---	---	0.15275+0.00014-0.00024	---	0.15399+0.00068-0.00065	---
b	0.184+0.048-0.079	---	---	---	0.112+0.079-0.071	---	---	---	---	---	---	---	0.136±0.028	---	---	---	---	---	0.051+0.023-0.049	---	---	---
δ (%)	2.312+0.018-0.019	---	---	---	---	---	---	---	---	---	---	2.3000±0.0058	---	---	---	---	---	2.384±0.028	2.3334+0.0044-0.0072	---	---	2.71370920051392±0.00836151800000
T₁₄ (hours)	2.16648±0.00576	---	---	---	---	---	---	---	---	---	---	---	2.1551±0.0025	---	---	---	---	2.1576±0.0048	2.1283+0.0019-0.0003	---	---	2.1560676107495±0.0086321505000
S (S_⨁)	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	1188.62185446373
λ (deg)	---	---	---	---	---	---	---	341±19	---	---	---	---	---	---	---	---	---	-1 +14-12	---	---	---	---

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Ancillary Information (14 Unique Files)

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+ WASP-4 (3 File Types, 14 Files)

Literature Time Series (3 File Types, 14 Files)

File Type	Data Points	Filter	Reference
Photometric Light Curve	134	Rc (Cousins)	Southworth et al. 2009
Photometric Light Curve	126	Rc (Cousins)	Southworth et al. 2009
Photometric Light Curve	104	Rc (Cousins)	Southworth et al. 2009
Photometric Light Curve	88	Rc (Cousins)	Southworth et al. 2009
Photometric Light Curve	374	z (Sloan)	Winn et al. 2009
Photometric Light Curve	339	z (Sloan)	Winn et al. 2009
Photometric Light Curve	244	z (Gunn)	Gillon et al. 2009
Photometric Light Curve	5419	Clear, no filter	Wilson et al. 2008
Photometric Light Curve	4107	Clear, no filter	Wilson et al. 2008
Photometric Light Curve	213	Rc (Cousins)	Wilson et al. 2008
Photometric Light Curve	9321	Clear, no filter	SuperWASP Consortium
Radial Velocity Curve	14	Optical Spectra	Wilson et al. 2008
Amateur Light Curve	180	R (Generic)	Amateur-Contributed Light Curves
Amateur Light Curve	152	R (Generic)	Amateur-Contributed Light Curves

Nearby Data (within 30 arcseconds) Browse Nearby Data

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Known Objects: 1 Confirmed Planets; 1 2MASS Point Source Catalog

Data Files: 1 SuperWASP Time Series; 1 Associated Literature Data

Bibliography (38 References)

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Orbital Decay Candidates Reconsidered: WASP-4 b Is Not Decaying and Kepler-1658 b Is Not a Planet
Winn & Stefánsson 2025 Reference Overview
In Search of Decay: An Analysis of Transit Times of Hot Jupiters in Main-sequence and Post-main-sequence Systems
Sodickson & Grunblatt 2025 Reference Overview
The orbit of WASP-4 b is in decay
Baştürk et al. 2025 Reference Overview
ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations
Kokori et al. 2023 Reference Overview
Emergent Spectral Fluxes of Hot Jupiters: An Abrupt Rise in Dayside Brightness Temperature Under Strong Irradiation
Deming et al. 2023 Reference Overview
Empirical Limb-darkening Coefficients and Transit Parameters of Known Exoplanets from TESS
Patel & Espinoza 2022 Reference Overview
Five Key Exoplanet Questions Answered via the Analysis of 25 Hot-Jupiter Atmospheres in Eclipse
Changeat et al. 2022 Reference Overview
TESS Transit Timing of Hundreds of Hot Jupiters
Ivshina & Winn 2022 Reference Overview
ExoClock Project. II. A Large-scale Integrated Study with 180 Updated Exoplanet Ephemerides
Kokori et al. 2022 Reference Overview
WASP-4 transit timing variation from a comprehensive set of 129 transits
Baluev et al. 2020 Reference Overview
The Revised TESS Input Catalog and Candidate Target List
TICv8 Reference Overview
WASP-4b Arrived Early for the TESS Mission
Bouma et al. 2019 Reference Overview
Gaia Data Release 2
Gaia DR2 Reference Overview
Gemini/GMOS Transmission Spectral Survey: Complete Optical Transmission Spectrum of the Hot Jupiter WASP-4b
Huitson et al. 2017 Reference Overview
ExoFOP TOI Table
ExoFOP
The GAPS Programme with HARPS-N at TNG . XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets
Bonomo et al. 2017 Reference Overview
Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes
Stassun et al. 2017 Reference Overview
Secondary eclipse observations for seven hot-Jupiters from the Anglo-Australian Telescope
Zhou et al. 2015 Reference Overview
Benchmarking the power of amateur observatories for TTV exoplanets detection
Baluev et al. 2015 Reference Overview
Friends of Hot Jupiters I: A Radial Velocity Search for Massive, Long-Period Companions to Close-In Gas Giant Planets
Knutson et al. 2014 Reference Overview
All WISE Data Release
Cutri et al. 2014 Reference Overview
TTVs analysis of Southern Stars: the case of WASP-4
Petrucci et al. 2013 Reference Overview
New and updated stellar parameters for 90 transit hosts. The effect of the surface gravity
Mortier et al. 2013 Reference Overview
TraMoS project - III. Improved physical parameters, timing analysis and starspot modelling of the WASP-4b exoplanet system from 38 transit observations
Hoyer et al. 2013 Reference Overview
Homogeneous studies of transiting extrasolar planets - V. New results for 38 planets
Southworth 2012 Reference Overview
Starspots and Spin-orbit Alignment in the WASP-4 Exoplanetary System
Sanchis-Ojeda et al. 2011 Reference Overview
A ground-based K_S-band detection of the thermal emission from the transiting exoplanet WASP-4b
Cáceres et al. 2011 Reference Overview
Secondary Eclipse Photometry of WASP-4b with Warm Spitzer
Beerer et al. 2011 Reference Overview
Spin-orbit angle measurements for six southern transiting planets. New insights into the dynamical origins of hot Jupiters
Triaud et al. 2010 Reference Overview
Homogeneous studies of transiting extrasolar planets - III. Additional planets and stellar models
Southworth 2010 Reference Overview
Exoplanet Archive Help: Amateur Light Curves
Amateur-Contributed Light Curves
High-precision photometry by telescope defocussing - II. The transiting planetary system WASP-4
Southworth et al. 2009 Reference Overview
High-precision photometry by telescope defocusing - I. The transiting planetary system WASP-5
Southworth et al. 2009 Reference Overview
The Transit Light Curve Project. XI. Submillimagnitude Photometry of Two Transits of the Bloated Planet WASP-4b
Winn et al. 2009 Reference Overview
Improved parameters for the transiting hot Jupiters WASP-4b andWASP-5b
Gillon et al. 2009 Reference Overview
WASP-4b: A 12th Magnitude Transiting Hot Jupiter in the Southern Hemisphere
Wilson et al. 2008 Reference Overview
2MASS All-Sky Catalog of Point Sources
2MASS Point Source Catalog Reference Overview
SuperWASP: Wide Angle Search for Planets
SuperWASP Consortium

Legend

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System
Star
Confirmed
Candidate
False Positive Planet
Controversial
False Positive

Aliases
Data Access
Transit Prediction Service
Time Series
Kepler | K2

External Link
Search
Browse
Download

Debug Info

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https://vmexoweb2.ipac.caltech.edu/data/Overviews_2.0/7/WASP-4.json

Catalog Parameters

RA

ra

23h34m15.10s

Dec

dec

-42d03m42.41s

β

elat

-35.55903

λ

elon

335.07051

b

glat

-68.29575

l

glon

344.4924

m_V

sy_vmag

12.483±0.041

m_TESS

sy_tmag

11.8295±0.0060

m_J

sy_jmag

11.179±0.025

m_H

sy_hmag

10.842±0.026

m_Ks

sy_kmag

10.746±0.021

sy_kepmag

no_data

m_W1

sy_w1mag

10.684±0.022

m_W2

sy_w2mag

10.748±0.020

m_W3

sy_w3mag

10.721±0.089

m_W4

sy_w4mag

8.465

sy_icmag

no_data

m_Gaia

sy_gaiamag

12.316200±0.000246

m_B

sy_bmag

13.514±0.477

sy_gmag

no_data

sy_imag

no_data

sy_rmag

no_data

sy_umag

no_data

sy_zmag

no_data

μ

sy_pm

88.0729150±0.0479378

μ_δ

sy_pmdec

-87.5177000±0.0478747

μ_α

sy_pmra

9.873730±0.052658

π

sy_plx

3.7145100±0.0517115

Distance

sy_dist

267.206+3.771-3.670

Set Parameters

R_✶

st_rad

0.912±0.013

T_eff

st_teff

5500±100

WASP-4 Overview

WASP-4 Architecture & Discovery Information

WASP-4