Registry · exoplanet

GJ 9827 c

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: 23h 27m 05.23s
Declination: −01° 17′ 07.2″
Galactic l, b: 81.348, -57.18
Magnitude V: 10.37
Distance: 29.661 pc

Planet

NASA Exoplanet Archive, composite parameters

Host star	GJ 9827 · K7 V
Discovery	Transit, 2017 · K2
Orbital period	3.6481 d
Semi-major axis	0.0395 au
Eccentricity	0
Radius	1.13 R⊕ · 0.1008 R♃
Mass	1.86 M⊕ · 0.005852 M♃
Density	7.142 g/cm³
Equilibrium temperature	715.94 K
System distance	29.661 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 6 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
1.92	M_earth	± 0.49	Transit	NASA Exoplanet Archive	Howard et al. 2025	2025
1.86	M_earth	± 0.37	Transit	NASA Exoplanet Archive	Passegger et al. 2024	2024
1.3	M_earth		Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
0.84	M_earth		Transit	NASA Exoplanet Archive	Rice et al. 2019	2019
2.42	M_earth	± 0.75	Transit	NASA Exoplanet Archive	Rodriguez et al. 2018	2018
1.45	M_earth	± 0.58	Transit	NASA Exoplanet Archive	Prieto-Arranz et al. 2018	2018

Radius 7 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
1.201	R_earth	± 0.04586	Transit	NASA Exoplanet Archive	Howard et al. 2025	2025
1.13	R_earth	± 0.07	Transit	NASA Exoplanet Archive	Passegger et al. 2024	2024
1.241	R_earth	± 0.024	Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
1.241	R_earth	± 0.024	Transit	NASA Exoplanet Archive	Rice et al. 2019	2019
1.269	R_earth	± 0.087	Transit	NASA Exoplanet Archive	Rodriguez et al. 2018	2018
1.24	R_earth	± 0.11	Transit	NASA Exoplanet Archive	Prieto-Arranz et al. 2018	2018
1.36	R_earth	± 0.09	Transit	NASA Exoplanet Archive	Niraula et al. 2017	2017

Orbital period 8 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
3.648095	d	± 2.40e-05	Transit	NASA Exoplanet Archive	Howard et al. 2025	2025
3.648103	d	± 1.30e-05	Transit	NASA Exoplanet Archive	Passegger et al. 2024	2024
3.648115	d	± 9.60e-06	Transit	NASA Exoplanet Archive	Kokori et al. 2023	2023
3.648096	d	± 6.30e-05	Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
3.648096	d	± 6.33e-05	Transit	NASA Exoplanet Archive	Rice et al. 2019	2019
3.648083	d	± 6.00e-05	Transit	NASA Exoplanet Archive	Rodriguez et al. 2018	2018
3.64823	d	± 0.00012	Transit	NASA Exoplanet Archive	Prieto-Arranz et al. 2018	2018
3.64802	d	± 0.00011	Transit	NASA Exoplanet Archive	Niraula et al. 2017	2017

Semi-major axis 6 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.0395	au	± 0.0009	Transit	NASA Exoplanet Archive	Passegger et al. 2024	2024
0.03925	au	± 0.00033	Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
0.03925	au	± 0.00042	Transit	NASA Exoplanet Archive	Rice et al. 2019	2019
0.03942	au	± 0.00062	Transit	NASA Exoplanet Archive	Rodriguez et al. 2018	2018
0.0429	au	± 0.0042	Transit	NASA Exoplanet Archive	Prieto-Arranz et al. 2018	2018
0.042	au	± 0.003	Transit	NASA Exoplanet Archive	Niraula et al. 2017	2017

Eccentricity 2 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.094			Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
0			Transit	NASA Exoplanet Archive	Rice et al. 2019	2019

Equilibrium temperature 6 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
730	K	± 15	Transit	NASA Exoplanet Archive	Howard et al. 2025	2025
715.94	K	± 20.33	Transit	NASA Exoplanet Archive	Passegger et al. 2024	2024
813	K	± 10	Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
811	K	± 30	Transit	NASA Exoplanet Archive	Rodriguez et al. 2018	2018
771	K	± 31	Transit	NASA Exoplanet Archive	Prieto-Arranz et al. 2018	2018
721.9	K	± 25	Transit	NASA Exoplanet Archive	Niraula et al. 2017	2017

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
GJ 9827 d	Exoplanet	0″	10.37
GJ 9827	Star	0″	—
GJ 9827 b	Exoplanet	0″	10.37
BD-02 5958c	Planet	6.72″	—
BD-02 5958d	Planet	6.72″	—
BD-02 5958	HighPM*	6.72″	10.1
BD-02 5958b	Planet	6.72″	—
SDSS J232648.26-012131.7	QSO	367″	—
6dFGS gJ232637.2-011435	Seyfert1	446.6″	—
SDSS J232733.80-012114.8	QSO	494.9″	—

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-9827-c · Registry entry updated 2026-08-14.