Registry · exoplanet

Kepler-51 d

Exoplanet 106 papers

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: 19h 45m 55.14s
Declination: +49° 56′ 15.5″
Galactic l, b: 83.113, 12.36
Magnitude V: 14.88
Distance: 783.83 pc

Also known as

1 identifiers

Kepler-51d

Planet

NASA Exoplanet Archive, composite parameters

Host star	Kepler-51 · G4
Discovery	Transit, 2014 · Kepler
Orbital period	130.194 d
Semi-major axis	0.509 au
Eccentricity	0.008
Radius	9.7 R⊕ · 0.865 R♃
Mass	7.6 M⊕ · 0.024 M♃
Density	0.046 g/cm³
Equilibrium temperature	381 K
System distance	783.83 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
6.79	M_earth	± 0.93	Transit	NASA Exoplanet Archive	Ofir et al. 2025	2025
6.6	M_earth	± 1	Transit	NASA Exoplanet Archive	Masuda et al. 2024	2024
5.6	M_earth	± 1.2	Transit	NASA Exoplanet Archive	Masuda et al. 2024	2024
5.7	M_earth	± 1.12	Transit	NASA Exoplanet Archive	Libby-Roberts et al. 2020	2020
6.2	M_earth	± 1.6	Transit	NASA Exoplanet Archive	Hadden & Lithwick 2017	2017
7.6	M_earth	± 1.1	Transit	NASA Exoplanet Archive	Masuda 2014	2014

Radius 13 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
9.32	R_earth	± 0.18	Transit	NASA Exoplanet Archive	Masuda et al. 2024	2024
9.46	R_earth	± 0.16	Transit	NASA Exoplanet Archive	Libby-Roberts et al. 2020	2020
9.071	R_earth	± 0.29	Transit	NASA Exoplanet Archive	Fulton & Petigura 2018	2018
8.954	R_earth	± 0.432	Transit	NASA Exoplanet Archive	Berger et al. 2018	2018
11.8	R_earth	± 2.3	Transit	NASA Exoplanet Archive	Hadden & Lithwick 2017	2017
11.67	R_earth	± 2.04	Transit	NASA Exoplanet Archive	Morton et al. 2016	2016
10.44	R_earth	± 3.22	Transit	NASA Exoplanet Archive	Q1-Q17 DR25 KOI Table	2014
11.18216	R_earth	± 1.184	Transit	NASA Exoplanet Archive	ExoFOP	2014
9.7	R_earth	± 0.5	Transit	NASA Exoplanet Archive	Masuda 2014	2014
10.74	R_earth	± 4.33	Transit	NASA Exoplanet Archive	Q1-Q17 DR24 KOI Table	2014
10.74	R_earth	± 4.33	Transit	NASA Exoplanet Archive	Q1-Q12 KOI Table	2014
10.74	R_earth	± 4.33	Transit	NASA Exoplanet Archive	Q1-Q16 KOI Table	2014

Show the remaining 1

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
10	R_earth	± 5.3	Transit	NASA Exoplanet Archive	Q1-Q8 KOI Table	2014

Orbital period 18 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
130.1771	d	± 9.40e-05	Transit	NASA Exoplanet Archive	Ofir et al. 2025	2025
130.1858	d	± 0.0018	Transit	NASA Exoplanet Archive	Masuda et al. 2024	2024
130.182	d	± 0.0024	Transit	NASA Exoplanet Archive	Masuda et al. 2024	2024
130.1845	d	± 0.0007	Transit	NASA Exoplanet Archive	Libby-Roberts et al. 2020	2020
130.1766	d	± 7.27e-05	Transit	NASA Exoplanet Archive	Gajdo&scaron; et al. 2019	2019
130.1775	d	± 9.84e-05	Transit	NASA Exoplanet Archive	Fulton & Petigura 2018	2018
130.18	d		Transit	NASA Exoplanet Archive	Hadden & Lithwick 2017	2017
130.1775	d	± 9.84e-05	Transit	NASA Exoplanet Archive	Morton et al. 2016	2016
130.1781	d	± 6.86e-06	Transit	NASA Exoplanet Archive	Holczer et al. 2016	2016
130.178	d	± 7.63e-05	Transit	NASA Exoplanet Archive	Q1-Q17 DR25 KOI Table	2014
130.1648	d	± 0.01643	Transit	NASA Exoplanet Archive	ExoFOP	2014
130.183	d		Transit	NASA Exoplanet Archive	Hadden et al. 2014	2014

Show the remaining 6

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
130.194	d	± 0.005	Transit	NASA Exoplanet Archive	Masuda 2014	2014
130.1775	d	± 9.84e-05	Transit	NASA Exoplanet Archive	Q1-Q17 DR24 KOI Table	2014
130.1775	d	± 9.84e-05	Transit	NASA Exoplanet Archive	Q1-Q12 KOI Table	2014
130.1775	d	± 9.84e-05	Transit	NASA Exoplanet Archive	Q1-Q16 KOI Table	2014
130.178	d	± 7.63e-05	Transit	NASA Exoplanet Archive	Q1-Q17 DR25 Supplemental KOI Table	2014
130.1831	d	± 0.00033	Transit	NASA Exoplanet Archive	Q1-Q8 KOI Table	2014

Semi-major axis 7 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.49068	au	± 0.00258	Transit	NASA Exoplanet Archive	Fulton & Petigura 2018	2018
0.5121	au		Transit	NASA Exoplanet Archive	Q1-Q17 DR25 KOI Table	2014
0.509	au	± 0.02	Transit	NASA Exoplanet Archive	Masuda 2014	2014
0.5121	au		Transit	NASA Exoplanet Archive	Q1-Q17 DR24 KOI Table	2014
0.5121	au		Transit	NASA Exoplanet Archive	Q1-Q12 KOI Table	2014
0.5121	au		Transit	NASA Exoplanet Archive	Q1-Q16 KOI Table	2014
0.51	au		Transit	NASA Exoplanet Archive	Q1-Q8 KOI Table	2014

Eccentricity 9 values

Value	Uncertainty	Band / method	Source	Reference	Year
0.0061	± 0.0056	Transit	NASA Exoplanet Archive	Masuda et al. 2024	2024
0.048	± 0.016	Transit	NASA Exoplanet Archive	Masuda et al. 2024	2024
0.01	± 0.01	Transit	NASA Exoplanet Archive	Libby-Roberts et al. 2020	2020
0		Transit	NASA Exoplanet Archive	Q1-Q17 DR25 KOI Table	2014
0.008	± 0.011	Transit	NASA Exoplanet Archive	Masuda 2014	2014
0		Transit	NASA Exoplanet Archive	Q1-Q17 DR24 KOI Table	2014
0		Transit	NASA Exoplanet Archive	Q1-Q12 KOI Table	2014
0		Transit	NASA Exoplanet Archive	Q1-Q16 KOI Table	2014
0		Transit	NASA Exoplanet Archive	Q1-Q8 KOI Table	2014

Equilibrium temperature 7 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
367	K		Transit	NASA Exoplanet Archive	Q1-Q17 DR25 KOI Table	2014
136.66	K		Transit	NASA Exoplanet Archive	ExoFOP	2014
381	K	± 8	Transit	NASA Exoplanet Archive	Masuda 2014	2014
367	K		Transit	NASA Exoplanet Archive	Q1-Q17 DR24 KOI Table	2014
367	K		Transit	NASA Exoplanet Archive	Q1-Q12 KOI Table	2014
367	K		Transit	NASA Exoplanet Archive	Q1-Q16 KOI Table	2014
361	K		Transit	NASA Exoplanet Archive	Q1-Q8 KOI Table	2014

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
Kepler-51 e	Exoplanet	0.003074″	14.88
Kepler-51 b	Exoplanet	0.003074″	14.88
Kepler-51 c	Exoplanet	0.003074″	14.88
Kepler-51	Eruptive*	0.1156″	—
TYC 3565-883-1	delSctV*	119″	11.56
2MASS J19460913+4955123	RGB*	149.2″	—
2MASS J19454178+4954095	Star	180.4″	—
KOI-5931	Star	188.5″	—
TYC 3565-1293-1	RGB*	191.1″	12.02
TYC 3565-1235-1	HighPM*	203.6″	9.84
UCAC4 700-070766	RGB*	211.3″	13.8

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/kepler-51-d · Registry entry updated 2026-08-14.