Registry · exoplanet

K2-3 d

Exoplanet 59 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: 11h 29m 20.49s
Declination: −01° 27′ 18.5″
Galactic l, b: 264.99, 55.25
Magnitude V: 12.17
Distance: 44.073 pc

Also known as

1 identifiers

K2-3d

Planet

NASA Exoplanet Archive, composite parameters

Host star	K2-3 · M1V
Discovery	Transit, 2015 · K2
Orbital period	44.556 d
Semi-major axis	0.2014 au
Eccentricity	0.091
Radius	1.458 R⊕ · 0.1301 R♃
Mass	2.2 M⊕ · 0.006922 M♃
Density	17.5 g/cm³
Equilibrium temperature	305.2 K
System distance	44.073 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
2.8	M_earth		Transit	NASA Exoplanet Archive	Howard et al. 2025	2025
1.6	M_earth		Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
2.2	M_earth		Transit	NASA Exoplanet Archive	Diamond-Lowe et al. 2022	2022
2.800068	M_earth		Transit	NASA Exoplanet Archive	Kosiarek et al. 2019	2019
1.8	M_earth		Transit	NASA Exoplanet Archive	Damasso et al. 2018	2018
7.5	M_earth	± 3	Transit	NASA Exoplanet Archive	Dai et al. 2016	2016
11.1	M_earth	± 3.5	Transit	NASA Exoplanet Archive	Almenara et al. 2015	2015

Radius 12 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
1.52	R_earth	± 0.21	Transit	NASA Exoplanet Archive	Howard et al. 2025	2025
1.62	R_earth	± 0.18	Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
1.458	R_earth	± 0.056	Transit	NASA Exoplanet Archive	Diamond-Lowe et al. 2022	2022
1.11	R_earth	± 0.21	Transit	NASA Exoplanet Archive	Kruse et al. 2019	2019
1.65	R_earth	± 0.17	Transit	NASA Exoplanet Archive	Damasso et al. 2018	2018
1.52	R_earth	± 0.21	Transit	NASA Exoplanet Archive	Dai et al. 2016	2016
1.61	R_earth	± 0.2	Transit	NASA Exoplanet Archive	Beichman et al. 2016	2016
0.96	R_earth	± 0.14	Transit	NASA Exoplanet Archive	Crossfield et al. 2016	2016
1.51	R_earth	± 0.23	Transit	NASA Exoplanet Archive	Sinukoff et al. 2016	2016
1.7	R_earth		Transit	NASA Exoplanet Archive	Vanderburg et al. 2016	2016
1.52	R_earth	± 0.21	Transit	NASA Exoplanet Archive	Crossfield et al. 2015	2015
1.53	R_earth	± 0.11	Transit	NASA Exoplanet Archive	Almenara et al. 2015	2015

Orbital period 14 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
44.55646	d	± 9.70e-05	Transit	NASA Exoplanet Archive	Howard et al. 2025	2025
44.55646	d	± 9.70e-05	Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
44.55603	d	± 0.00013	Transit	NASA Exoplanet Archive	Diamond-Lowe et al. 2022	2022
44.55646	d	± 0.00011	Transit	NASA Exoplanet Archive	Kosiarek et al. 2019	2019
44.5574	d	± 0.0023	Transit	NASA Exoplanet Archive	Kruse et al. 2019	2019
44.55764	d	± 0.00042	Transit	NASA Exoplanet Archive	Damasso et al. 2018	2018
44.5631	d	± 0.0063	Transit	NASA Exoplanet Archive	Dai et al. 2016	2016
44.55765	d	± 0.00043	Transit	NASA Exoplanet Archive	Beichman et al. 2016	2016
44.5609	d	± 0.0052	Transit	NASA Exoplanet Archive	Crossfield et al. 2016	2016
44.55983	d	± 0.0059	Transit	NASA Exoplanet Archive	Sinukoff et al. 2016	2016
44.56115	d		Transit	NASA Exoplanet Archive	Vanderburg et al. 2016	2016
44.55612	d	± 0.00021	Transit	NASA Exoplanet Archive	Fukui et al. 2016	2016

Show the remaining 2

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
44.5631	d	± 0.0063	Transit	NASA Exoplanet Archive	Crossfield et al. 2015	2015
44.5705	d	± 0.0059	Transit	NASA Exoplanet Archive	Almenara et al. 2015	2015

Semi-major axis 7 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.2097	au	± 0.007	Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
0.2014	au	± 0.0034	Transit	NASA Exoplanet Archive	Diamond-Lowe et al. 2022	2022
0.2097	au	± 0.0065	Transit	NASA Exoplanet Archive	Damasso et al. 2018	2018
0.1833	au	± 0.0086	Transit	NASA Exoplanet Archive	Crossfield et al. 2016	2016
0.2076	au	± 0.0104	Transit	NASA Exoplanet Archive	Sinukoff et al. 2016	2016
0.2076	au	± 0.0098	Transit	NASA Exoplanet Archive	Crossfield et al. 2015	2015
0.2086	au	± 0.01	Transit	NASA Exoplanet Archive	Almenara et al. 2015	2015

Eccentricity 5 values

Value	Uncertainty	Band / method	Source	Reference	Year
0.097		Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
0.091	± 0.12	Transit	NASA Exoplanet Archive	Diamond-Lowe et al. 2022	2022
0		Transit	NASA Exoplanet Archive	Kosiarek et al. 2019	2019
0		Transit	NASA Exoplanet Archive	Dai et al. 2016	2016
0.045	± 0.045	Transit	NASA Exoplanet Archive	Almenara et al. 2015	2015

Equilibrium temperature 5 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
282	K	± 24	Transit	NASA Exoplanet Archive	Howard et al. 2025	2025
312	K	± 17	Transit	NASA Exoplanet Archive	Bonomo et al. 2023	2023
305.2	K	± 3.1	Transit	NASA Exoplanet Archive	Diamond-Lowe et al. 2022	2022
300	K		Transit	NASA Exoplanet Archive	Beichman et al. 2016	2016
282	K	± 24	Transit	NASA Exoplanet Archive	Sinukoff et al. 2016	2016

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
K2-3 b	Exoplanet	0.003074″	12.17
K2-3 c	Exoplanet	0.003074″	12.17
K2-3	HighPM*	1.895″	12.17
2dFGRS TGN306Z134	Galaxy	338.2″	—
[VV2006] J112900.5-013030	QSO	354.9″	20.03
[VV2006] J112941.5-012356	QSO	374.7″	—
SDSS J112946.52-012922.3	QSO	409.7″	—
2QZ J112948.5-013111	Seyfert1	480.1″	—
LP 612-57	HighPM*	491.9″	15.3
4C -00.44	QSO	510.7″	19

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/k2-3-d · Registry entry updated 2026-08-14.