Registry · exoplanet

WASP-18 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: 01h 37m 25.07s
Declination: −45° 40′ 40.1″
Galactic l, b: 279.71, -69.32
Magnitude V: 9.28
Distance: 123.48 pc

Planet

NASA Exoplanet Archive, composite parameters

Host star	WASP-18 · F6 IV-V
Discovery	Transit, 2009 · SuperWASP
Orbital period	0.941452 d
Semi-major axis	0.02024 au
Eccentricity	0.0051
Radius	13.899 R⊕ · 1.24 R♃
Mass	3,241.8 M⊕ · 10.2 M♃
Density	6.6 g/cm³
Equilibrium temperature	2,429 K
System distance	123.48 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 12 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
3,241.85	M_earth	± 111.2	Transit	NASA Exoplanet Archive	Cortés-Zuleta et al. 2020	2020
3,314.82	M_earth		Transit	NASA Exoplanet Archive	Pearson 2019	2019
3,305.432	M_earth		Transit	NASA Exoplanet Archive	Shporer et al. 2019	2019
3,635.975	M_earth	± 479.9	Transit	NASA Exoplanet Archive	Stassun et al. 2017	2017
3,241.866	M_earth	± 222.5	Transit	NASA Exoplanet Archive	Bonomo et al. 2017	2017
3,241.7	M_earth		Transit	NASA Exoplanet Archive	Salz et al. 2015	2015
3,327.68	M_earth	± 155.7	Transit	NASA Exoplanet Archive	Knutson et al. 2014	2014
3,299.075	M_earth	± 108.1	Transit	NASA Exoplanet Archive	Southworth 2012	2012
3,213.261	M_earth	± 76.28	Transit	NASA Exoplanet Archive	Triaud et al. 2010	2010
3,270.471	M_earth	± 117.6	Transit	NASA Exoplanet Archive	Southworth 2010	2010
3,314.967	M_earth	± 120.8	Transit	NASA Exoplanet Archive	Southworth et al. 2009	2009
3,314.83	M_earth	± 120.8	Transit	NASA Exoplanet Archive	Hellier et al. 2009	2009

Radius 12 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
13.36783	R_earth	± 0.08631	Transit	NASA Exoplanet Archive	Deline et al. 2025	2025
13.89914	R_earth	± 0.8855	Transit	NASA Exoplanet Archive	Cortés-Zuleta et al. 2020	2020
13.34992	R_earth	± 0.4259	Transit	NASA Exoplanet Archive	Shporer et al. 2019	2019
13.4508	R_earth	± 0.5605	Transit	NASA Exoplanet Archive	Stassun et al. 2017	2017
12.39715	R_earth	± 0.807	Transit	NASA Exoplanet Archive	Bonomo et al. 2017	2017
14.6	R_earth		Transit	NASA Exoplanet Archive	Salz et al. 2015	2015
13.03607	R_earth	± 0.6165	Transit	NASA Exoplanet Archive	Southworth 2012	2012
14.2018	R_earth	± 0.695	Transit	NASA Exoplanet Archive	Triaud et al. 2010	2010
12.98002	R_earth	± 0.6165	Transit	NASA Exoplanet Archive	Southworth 2010	2010
15.342	R_earth	± 0.8016	Transit	NASA Exoplanet Archive	ExoFOP	2009
13.05848	R_earth	± 0.6389	Transit	NASA Exoplanet Archive	Southworth et al. 2009	2009
13.059	R_earth	± 0.639	Transit	NASA Exoplanet Archive	Hellier et al. 2009	2009

Orbital period 16 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.9414525	d	± 1.10e-08	Transit	NASA Exoplanet Archive	Nediyedath et al. 2026	2026
0.9414524	d	± 1.60e-08	Transit	NASA Exoplanet Archive	Deline et al. 2025	2025
0.9414524	d	± 1.90e-08	Transit	NASA Exoplanet Archive	Kokori et al. 2023	2023
0.9414524	d	± 3.50e-08	Transit	NASA Exoplanet Archive	Ivshina & Winn 2022	2022
0.9414525	d	± 8.00e-08	Transit	NASA Exoplanet Archive	Kokori et al. 2022	2022
0.9414522	d	± 2.40e-07	Transit	NASA Exoplanet Archive	Cortés-Zuleta et al. 2020	2020
0.94124	d	± 2.34e-06	Transit	NASA Exoplanet Archive	Pearson 2019	2019
0.9414526	d	± 1.60e-06	Transit	NASA Exoplanet Archive	Shporer et al. 2019	2019
0.94145	d	± 1.00e-06	Transit	NASA Exoplanet Archive	Stassun et al. 2017	2017
0.9414523	d	± 3.00e-07	Transit	NASA Exoplanet Archive	Bonomo et al. 2017	2017
0.9	d		Transit	NASA Exoplanet Archive	Salz et al. 2015	2015
0.9414518	d	± 4.40e-07	Transit	NASA Exoplanet Archive	Southworth 2012	2012

Show the remaining 4

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.9414529	d	± 7.80e-07	Transit	NASA Exoplanet Archive	Triaud et al. 2010	2010
0.9414518	d	± 4.40e-07	Transit	NASA Exoplanet Archive	Southworth 2010	2010
0.9414525	d	± 1.00e-07	Transit	NASA Exoplanet Archive	ExoFOP	2009
0.941453	d	± 8.70e-07	Transit	NASA Exoplanet Archive	Hellier et al. 2009	2009

Semi-major axis 11 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.02041	au	± 0.00015	Transit	NASA Exoplanet Archive	Deline et al. 2025	2025
0.02024	au	± 0.00029	Transit	NASA Exoplanet Archive	Cortés-Zuleta et al. 2020	2020
0.02	au		Transit	NASA Exoplanet Archive	Pearson 2019	2019
0.02087	au	± 0.00068	Transit	NASA Exoplanet Archive	Shporer et al. 2019	2019
0.0203	au	± 0.00069	Transit	NASA Exoplanet Archive	Bonomo et al. 2017	2017
0.02	au		Transit	NASA Exoplanet Archive	Salz et al. 2015	2015
0.02043	au	± 0.00032	Transit	NASA Exoplanet Archive	Southworth 2012	2012
0.0202	au	± 0.00024	Transit	NASA Exoplanet Archive	Triaud et al. 2010	2010
0.02034	au	± 0.00036	Transit	NASA Exoplanet Archive	Southworth 2010	2010
0.02047	au	± 0.00038	Transit	NASA Exoplanet Archive	Southworth et al. 2009	2009
0.02026	au	± 0.00068	Transit	NASA Exoplanet Archive	Hellier et al. 2009	2009

Eccentricity 12 values

Value	Uncertainty	Band / method	Source	Reference	Year
0.00838		Transit	NASA Exoplanet Archive	Nediyedath et al. 2026	2026
0.00852	± 0.00091	Transit	NASA Exoplanet Archive	Deline et al. 2025	2025
0.0091	± 0.0012	Transit	NASA Exoplanet Archive	Kokori et al. 2023	2023
0.0051	± 0.007	Transit	NASA Exoplanet Archive	Cortés-Zuleta et al. 2020	2020
0.0085	± 0.002	Transit	NASA Exoplanet Archive	Csizmadia et al. 2019	2019
0.0091		Transit	NASA Exoplanet Archive	Shporer et al. 2019	2019
0.01	± 0	Transit	NASA Exoplanet Archive	Stassun et al. 2017	2017
0.00757	± 0.001	Transit	NASA Exoplanet Archive	Bonomo et al. 2017	2017
0		Transit	NASA Exoplanet Archive	Salz et al. 2015	2015
0.0068	± 0.0025	Transit	NASA Exoplanet Archive	Knutson et al. 2014	2014
0.00848	± 0.00085	Transit	NASA Exoplanet Archive	Triaud et al. 2010	2010
0.0092	± 0.0028	Transit	NASA Exoplanet Archive	Hellier et al. 2009	2009

Equilibrium temperature 5 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
2,429	K	± 77	Transit	NASA Exoplanet Archive	Cortés-Zuleta et al. 2020	2020
2,400	K		Transit	NASA Exoplanet Archive	Salz et al. 2015	2015
2,413	K	± 44	Transit	NASA Exoplanet Archive	Southworth 2012	2012
2,392	K	± 51	Transit	NASA Exoplanet Archive	Southworth 2010	2010
2,251	K		Transit	NASA Exoplanet Archive	ExoFOP	2009

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
WASP-18	Star	0″	—
HD 10069c	Planet	0.5056″	—
HD 10069	SB*	0.5056″	9.3
HD 10069b	Planet	0.5056″	—
GALEX J013657.7-453533	WhiteDwarf	419.3″	—

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/wasp-18-b · Registry entry updated 2026-08-14.