Registry · exoplanet

GJ 9827 d

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	6.20183 d
Semi-major axis	0.053 au
Eccentricity	0
Radius	1.98 R⊕ · 0.1766 R♃
Mass	3.02 M⊕ · 0.009502 M♃
Density	2.51 g/cm³
Equilibrium temperature	675 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 7 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
3.42	M_earth	± 0.62	Transit	NASA Exoplanet Archive	Howard et al. 2025	2025
3.02	M_earth	± 0.58	Transit	NASA Exoplanet Archive	Piaulet-Ghorayeb et al. 2024	2024
3.02	M_earth	± 0.58	Transit	NASA Exoplanet Archive	Passegger et al. 2024	2024
3.53	M_earth	± 0.87	Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
4.04	M_earth	± 0.82	Transit	NASA Exoplanet Archive	Rice et al. 2019	2019
5.2	M_earth	± 1.8	Transit	NASA Exoplanet Archive	Rodriguez et al. 2018	2018
2.35	M_earth	± 0.7	Transit	NASA Exoplanet Archive	Prieto-Arranz et al. 2018	2018

Radius 8 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
1.955	R_earth	± 0.07535	Transit	NASA Exoplanet Archive	Howard et al. 2025	2025
1.98	R_earth	± 0.11	Transit	NASA Exoplanet Archive	Piaulet-Ghorayeb et al. 2024	2024
1.89	R_earth	± 0.16	Transit	NASA Exoplanet Archive	Passegger et al. 2024	2024
2.022	R_earth	± 0.046	Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
2.022	R_earth	± 0.046	Transit	NASA Exoplanet Archive	Rice et al. 2019	2019
2.07	R_earth	± 0.14	Transit	NASA Exoplanet Archive	Rodriguez et al. 2018	2018
2.04	R_earth	± 0.18	Transit	NASA Exoplanet Archive	Prieto-Arranz et al. 2018	2018
2.1	R_earth	± 0.15	Transit	NASA Exoplanet Archive	Niraula et al. 2017	2017

Orbital period 8 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
6.20183	d	± 1.00e-05	Transit	NASA Exoplanet Archive	Howard et al. 2025	2025
6.20183	d	± 3.00e-06	Transit	NASA Exoplanet Archive	Piaulet-Ghorayeb et al. 2024	2024
6.201812	d	± 9.00e-06	Transit	NASA Exoplanet Archive	Passegger et al. 2024	2024
6.20147	d	± 6.30e-05	Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
6.20147	d	± 6.26e-05	Transit	NASA Exoplanet Archive	Rice et al. 2019	2019
6.201467	d	± 6.20e-05	Transit	NASA Exoplanet Archive	Rodriguez et al. 2018	2018
6.20142	d	± 0.00013	Transit	NASA Exoplanet Archive	Prieto-Arranz et al. 2018	2018
6.20141	d	± 0.00013	Transit	NASA Exoplanet Archive	Niraula et al. 2017	2017

Semi-major axis 7 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.053	au	± 0.003	Transit	NASA Exoplanet Archive	Piaulet-Ghorayeb et al. 2024	2024
0.0563	au	± 0.0012	Transit	NASA Exoplanet Archive	Passegger et al. 2024	2024
0.0559	au	± 0.00046	Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
0.05591	au	± 0.00059	Transit	NASA Exoplanet Archive	Rice et al. 2019	2019
0.05615	au	± 0.00089	Transit	NASA Exoplanet Archive	Rodriguez et al. 2018	2018
0.0611	au	± 0.006	Transit	NASA Exoplanet Archive	Prieto-Arranz et al. 2018	2018
0.06	au	± 0.005	Transit	NASA Exoplanet Archive	Niraula et al. 2017	2017

Eccentricity 2 values

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

Equilibrium temperature 7 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
612	K	± 12	Transit	NASA Exoplanet Archive	Howard et al. 2025	2025
675	K	± 14	Transit	NASA Exoplanet Archive	Piaulet-Ghorayeb et al. 2024	2024
599.68	K	± 16.86	Transit	NASA Exoplanet Archive	Passegger et al. 2024	2024
681	K	± 8	Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
680	K	± 25	Transit	NASA Exoplanet Archive	Rodriguez et al. 2018	2018
646	K	± 26	Transit	NASA Exoplanet Archive	Prieto-Arranz et al. 2018	2018
604.9	K	± 20.8	Transit	NASA Exoplanet Archive	Niraula et al. 2017	2017

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
GJ 9827 c	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-d · Registry entry updated 2026-08-14.