Registry · exoplanet

KELT-20 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: 19h 38m 38.74s
Declination: +31° 13′ 09.1″
Galactic l, b: 65.808, 4.627
Magnitude V: 7.59
Distance: 136.43 pc

Planet

NASA Exoplanet Archive, composite parameters

Host star	KELT-20 · A2 V
Discovery	Transit, 2017 · KELT-North
Orbital period	3.47411 d
Semi-major axis	0.0542 au
Eccentricity	0
Radius	19.515 R⊕ · 1.741 R♃
Mass	1,074.9 M⊕ · 3.382 M♃
Density	0.806 g/cm³
Equilibrium temperature	2,262 K
System distance	136.43 pc

Recorded parameters

1 quantity with a single published value

Parameter	Value	Unit	Uncertainty	As published	Source	Reference
Eccentricity	0			Transit	NASA Exoplanet Archive	Talens et al. 2018

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
5,403.11	M_earth		Transit	NASA Exoplanet Archive	Talens et al. 2018	2018
1,074.901	M_earth		Transit	NASA Exoplanet Archive	Lund et al. 2017	2017

Radius 3 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
20.51247	R_earth	± 0.7846	Transit	NASA Exoplanet Archive	Talens et al. 2018	2018
21.2912	R_earth	± 0.5798	Transit	NASA Exoplanet Archive	ExoFOP	2017
19.51487	R_earth	± 0.7734	Transit	NASA Exoplanet Archive	Lund et al. 2017	2017

Orbital period 6 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
3.4741	d	± 2.20e-07	Transit	NASA Exoplanet Archive	Kokori et al. 2023	2023
3.474108	d	± 1.80e-06	Transit	NASA Exoplanet Archive	Patel & Espinoza 2022	2022
3.4741	d	± 6.10e-07	Transit	NASA Exoplanet Archive	Ivshina & Winn 2022	2022
3.474119	d	± 5.00e-06	Transit	NASA Exoplanet Archive	Talens et al. 2018	2018
3.474101	d	± 2.00e-07	Transit	NASA Exoplanet Archive	ExoFOP	2017
3.474108	d	± 1.90e-06	Transit	NASA Exoplanet Archive	Lund et al. 2017	2017

Semi-major axis 2 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.057	au	± 0.006	Transit	NASA Exoplanet Archive	Talens et al. 2018	2018
0.0542	au	± 0.0014	Transit	NASA Exoplanet Archive	Lund et al. 2017	2017

Equilibrium temperature 3 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
2,260	K	± 50	Transit	NASA Exoplanet Archive	Talens et al. 2018	2018
2,084.33	K		Transit	NASA Exoplanet Archive	ExoFOP	2017
2,262	K	± 73	Transit	NASA Exoplanet Archive	Lund et al. 2017	2017

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
KELT-20	Star	0″	—
HD 185603	Star	0.1084″	7.58
HD 185603b	Planet	0.1084″	—
ATO J294.7042+31.3033	EclBin	330.3″	—
ATO J294.5319+31.1332	LongPeriodV*	504.9″	—

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/kelt-20-b · Registry entry updated 2026-08-14.