Registry · exoplanet

GJ 436 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: 11h 42m 12.13s
Declination: +26° 42′ 11.0″
Galactic l, b: 210.56, 74.57
Magnitude V: 10.67
Distance: 9.7532 pc

Planet

NASA Exoplanet Archive, composite parameters

Host star	GJ 436 · M2.5 V
Discovery	Radial Velocity, 2004 · W. M. Keck Observatory
Orbital period	2.64388 d
Semi-major axis	0.0291 au
Eccentricity	0.1383
Radius	4.17 R⊕ · 0.372 R♃
Mass	22.1 M⊕ · 0.07 M♃
Density	1.8 g/cm³
Equilibrium temperature	686 K
System distance	9.7532 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 16 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
21.72	M_earth	± 0.63	Radial Velocity	NASA Exoplanet Archive	Maxted et al. 2022	2022
21.23094	M_earth	± 0.6992	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
25.4	M_earth	± 2.1	Radial Velocity	NASA Exoplanet Archive	Bourrier et al. 2018	2018
21.36	M_earth	± 0.2	Radial Velocity	NASA Exoplanet Archive	Trifonov et al. 2018	2018
23.13802	M_earth	± 0.7628	Radial Velocity	NASA Exoplanet Archive	Turner et al. 2016	2016
23.201	M_earth		Radial Velocity	NASA Exoplanet Archive	Salz et al. 2015	2015
25.4	M_earth	± 2.1	Radial Velocity	NASA Exoplanet Archive	Lanotte et al. 2014	2014
21.67601	M_earth	± 0.7946	Radial Velocity	NASA Exoplanet Archive	Knutson et al. 2014	2014
22.1	M_earth	± 2.3	Radial Velocity	NASA Exoplanet Archive	Maciejewski et al. 2014	2014
23.42407	M_earth	± 1.716	Radial Velocity	NASA Exoplanet Archive	Southworth 2010	2010
23.1	M_earth	± 0.9	Radial Velocity	NASA Exoplanet Archive	Shporer et al. 2009	2009
23.1688	M_earth	± 0.7945	Radial Velocity	NASA Exoplanet Archive	Torres et al. 2008	2008

Show the remaining 4

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
22.6603	M_earth	± 1.907	Radial Velocity	NASA Exoplanet Archive	Maness et al. 2007	2007
21.6751	M_earth	± 2.002	Radial Velocity	NASA Exoplanet Archive	Wright et al. 2007	2007
21.3891	M_earth	± 2.066	Radial Velocity	NASA Exoplanet Archive	Butler et al. 2006	2006
21.294	M_earth	± 2.225	Radial Velocity	NASA Exoplanet Archive	Butler et al. 2004	2004

Radius 11 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
3.85	R_earth	± 0.1	Radial Velocity	NASA Exoplanet Archive	Maxted et al. 2022	2022
4.191045	R_earth	± 0.1087	Radial Velocity	NASA Exoplanet Archive	Turner et al. 2016	2016
4.26	R_earth		Radial Velocity	NASA Exoplanet Archive	Salz et al. 2015	2015
4.1	R_earth	± 0.16	Radial Velocity	NASA Exoplanet Archive	Lanotte et al. 2014	2014
4.17	R_earth	± 0.168	Radial Velocity	NASA Exoplanet Archive	Maciejewski et al. 2014	2014
3.96	R_earth	± 0.05	Radial Velocity	NASA Exoplanet Archive	Knutson et al. 2011	2011
4.091285	R_earth	± 0.2018	Radial Velocity	NASA Exoplanet Archive	Southworth 2010	2010
4.04	R_earth	± 0.1	Radial Velocity	NASA Exoplanet Archive	Pont et al. 2009	2009
4.2	R_earth	± 0.2	Radial Velocity	NASA Exoplanet Archive	Shporer et al. 2009	2009
4.2224	R_earth	± 0.0919	Radial Velocity	NASA Exoplanet Archive	Torres et al. 2008	2008
3.812114	R_earth	± 0.1189	Radial Velocity	NASA Exoplanet Archive	ExoFOP	2004

Orbital period 23 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
2.643898	d	± 1.20e-07	Radial Velocity	NASA Exoplanet Archive	Mukherjee et al. 2025	2025
2.643898	d	± 9.60e-08	Radial Velocity	NASA Exoplanet Archive	Kokori et al. 2023	2023
2.643898	d		Radial Velocity	NASA Exoplanet Archive	Maxted et al. 2022	2022
2.643898	d	± 1.20e-07	Radial Velocity	NASA Exoplanet Archive	Kokori et al. 2022	2022
2.643892	d	± 2.50e-05	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
2.643898	d	± 2.60e-07	Radial Velocity	NASA Exoplanet Archive	Bourrier et al. 2018	2018
2.644	d	± 0.001	Radial Velocity	NASA Exoplanet Archive	Trifonov et al. 2018	2018
2.643898	d	± 1.00e-07	Radial Velocity	NASA Exoplanet Archive	Turner et al. 2016	2016
2.6	d		Radial Velocity	NASA Exoplanet Archive	Salz et al. 2015	2015
2.643898	d	± 4.40e-07	Radial Velocity	NASA Exoplanet Archive	Baluev et al. 2015	2015
2.643898	d	± 2.70e-07	Radial Velocity	NASA Exoplanet Archive	Lanotte et al. 2014	2014
2.643883	d	± 5.70e-07	Radial Velocity	NASA Exoplanet Archive	Maciejewski et al. 2014	2014

Show the remaining 11

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
2.643898	d	± 3.00e-07	Radial Velocity	NASA Exoplanet Archive	Knutson et al. 2011	2011
2.643895	d	± 7.60e-07	Radial Velocity	NASA Exoplanet Archive	Southworth 2010	2010
2.643899	d	± 1.60e-06	Radial Velocity	NASA Exoplanet Archive	Caceres et al. 2009	2009
2.64389	d		Radial Velocity	NASA Exoplanet Archive	Pont et al. 2009	2009
2.64386	d	± 3.00e-05	Radial Velocity	NASA Exoplanet Archive	Shporer et al. 2009	2009
2.64385	d		Radial Velocity	NASA Exoplanet Archive	Torres et al. 2008	2008
2.64385	d	± 9.00e-05	Radial Velocity	NASA Exoplanet Archive	Maness et al. 2007	2007
2.643859	d	± 7.40e-05	Radial Velocity	NASA Exoplanet Archive	Wright et al. 2007	2007
2.643943	d	± 8.40e-05	Radial Velocity	NASA Exoplanet Archive	Butler et al. 2006	2006
2.643886	d	± 3.16e-05	Radial Velocity	NASA Exoplanet Archive	ExoFOP	2004
2.6441	d	± 0.0005	Radial Velocity	NASA Exoplanet Archive	Butler et al. 2004	2004

Semi-major axis 14 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.02849	au	± 0.0002	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
0.028	au	± 0.001	Radial Velocity	NASA Exoplanet Archive	Trifonov et al. 2018	2018
0.03109	au	± 0.00074	Radial Velocity	NASA Exoplanet Archive	Turner et al. 2016	2016
0.029	au		Radial Velocity	NASA Exoplanet Archive	Salz et al. 2015	2015
0.0308	au	± 0.0013	Radial Velocity	NASA Exoplanet Archive	Lanotte et al. 2014	2014
0.0291	au	± 0.0015	Radial Velocity	NASA Exoplanet Archive	Maciejewski et al. 2014	2014
0.0287	au	± 0.0003	Radial Velocity	NASA Exoplanet Archive	Knutson et al. 2011	2011
0.02887	au	± 0.00096	Radial Velocity	NASA Exoplanet Archive	Southworth 2010	2010
0.02872	au	± 0.0003	Radial Velocity	NASA Exoplanet Archive	Shporer et al. 2009	2009
0.02872	au	± 0.00029	Radial Velocity	NASA Exoplanet Archive	Torres et al. 2008	2008
0.0285	au		Radial Velocity	NASA Exoplanet Archive	Maness et al. 2007	2007
0.0278	au	± 0.0016	Radial Velocity	NASA Exoplanet Archive	Wright et al. 2007	2007

Show the remaining 2

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.0278	au	± 0.0016	Radial Velocity	NASA Exoplanet Archive	Butler et al. 2006	2006
0.0278	au		Radial Velocity	NASA Exoplanet Archive	Butler et al. 2004	2004

Eccentricity 13 values

Value	Uncertainty	Band / method	Source	Reference	Year
0.1634	± 0.0027	Radial Velocity	NASA Exoplanet Archive	Mukherjee et al. 2025	2025
0.145	± 0.027	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
0.1616	± 0.004	Radial Velocity	NASA Exoplanet Archive	Bourrier et al. 2018	2018
0.152	± 0.009	Radial Velocity	NASA Exoplanet Archive	Trifonov et al. 2018	2018
0.15	± 0.012	Radial Velocity	NASA Exoplanet Archive	Turner et al. 2016	2016
0.2		Radial Velocity	NASA Exoplanet Archive	Salz et al. 2015	2015
0.1616	± 0.0041	Radial Velocity	NASA Exoplanet Archive	Lanotte et al. 2014	2014
0.1495	± 0.016	Radial Velocity	NASA Exoplanet Archive	Knutson et al. 2014	2014
0.13827	± 0.00018	Radial Velocity	NASA Exoplanet Archive	Maciejewski et al. 2014	2014
0.16	± 0.019	Radial Velocity	NASA Exoplanet Archive	Maness et al. 2007	2007
0.145	± 0.052	Radial Velocity	NASA Exoplanet Archive	Wright et al. 2007	2007
0.207	± 0.052	Radial Velocity	NASA Exoplanet Archive	Butler et al. 2006	2006

Show the remaining 1

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.12		± 0.06	Radial Velocity	NASA Exoplanet Archive	Butler et al. 2004	2004

Equilibrium temperature 5 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
686	K	± 10	Radial Velocity	NASA Exoplanet Archive	Turner et al. 2016	2016
650	K		Radial Velocity	NASA Exoplanet Archive	Salz et al. 2015	2015
669	K	± 22	Radial Velocity	NASA Exoplanet Archive	Southworth 2010	2010
649	K	± 60	Radial Velocity	NASA Exoplanet Archive	Torres et al. 2008	2008
594.05	K		Radial Velocity	NASA Exoplanet Archive	ExoFOP	2004

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
GJ 436	Star	0″	—
Ross 905c	Planet Candidate	18.75″	—
Ross 905b	Planet	18.75″	—
Ross 905	HighPM*	18.75″	10.61
BD+27 2046	Star	233.2″	10.63
TYC 1984-1884-1	RGB*	236.4″	10.76
SDSS J114229.22+264012.4	QSO	258″	19.32
SDSS J114229.67+263957.5	QSO	270.4″	—
SDSS J114235.30+264216.6	QSO	310.6″	—
2MASS J11422639+2638014	RGB*	314.4″	—
SDSS J114232.03+263713.3	QSO	399.7″	—

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/gj-436-b · Registry entry updated 2026-08-14.