Registry · exoplanet

GJ 357 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: 09h 36m 01.79s
Declination: −21° 39′ 54.2″
Galactic l, b: 253.89, 22.08
Magnitude V: 10.91
Distance: 9.4418 pc

Planet

NASA Exoplanet Archive, composite parameters

Host star	GJ 357 · M2.5 V
Discovery	Transit, 2019 · Transiting Exoplanet Survey Satellite (TESS)
Orbital period	3.9306 d
Semi-major axis	0.036 au
Eccentricity	—
Radius	1.2 R⊕ · 0.1071 R♃
Mass	1.83 M⊕ · 0.005758 M♃
Density	5.6 g/cm³
Equilibrium temperature	518 K
System distance	9.4418 pc

Published measurements

5 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 2 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
1.83	M_earth	± 0.3	Transit	NASA Exoplanet Archive	Weisserman et al. 2026	2026
1.84	M_earth	± 0.31	Transit	NASA Exoplanet Archive	Luque et al. 2019	2019

Radius 4 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
1.21	R_earth	± 0.05	Transit	NASA Exoplanet Archive	Weisserman et al. 2026	2026
1.2	R_earth	± 0.06	Transit	NASA Exoplanet Archive	Oddo et al. 2023	2023
1.26995	R_earth	± 0.05061	Transit	NASA Exoplanet Archive	ExoFOP	2019
1.217	R_earth	± 0.084	Transit	NASA Exoplanet Archive	Luque et al. 2019	2019

Orbital period 5 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
3.93	d		Transit	NASA Exoplanet Archive	Weisserman et al. 2026	2026
3.930623	d	± 1.00e-05	Transit	NASA Exoplanet Archive	Kokori et al. 2023	2023
3.9306	d	± 2.00e-06	Transit	NASA Exoplanet Archive	Oddo et al. 2023	2023
3.930603	d	± 3.00e-06	Transit	NASA Exoplanet Archive	ExoFOP	2019
3.93072	d	± 8.00e-05	Transit	NASA Exoplanet Archive	Luque et al. 2019	2019

Semi-major axis 2 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.036	au	± 0.0004	Transit	NASA Exoplanet Archive	Oddo et al. 2023	2023
0.035	au	± 0.002	Transit	NASA Exoplanet Archive	Luque et al. 2019	2019

Equilibrium temperature 4 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
548	K	± 11	Transit	NASA Exoplanet Archive	Weisserman et al. 2026	2026
518	K	± 44	Transit	NASA Exoplanet Archive	Oddo et al. 2023	2023
561	K		Transit	NASA Exoplanet Archive	ExoFOP	2019
525	K	± 11	Transit	NASA Exoplanet Archive	Luque et al. 2019	2019

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
GJ 357 d	Exoplanet	0″	10.91
GJ 357 c	Exoplanet	0″	10.91
GJ 357	Star	0″	—
L 678-39c	Planet	15.5″	—
L 678-39	HighPM*	15.5″	10.91
L 678-39d	Planet	15.5″	—
L 678-39b	Planet	15.5″	—
ESO 565-21	AGN Candidate	251.6″	—
TYC 6042-912-1	Star	347.5″	10.9

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-357-b · Registry entry updated 2026-08-14.