UPSA Object Registry
Registry · exoplanet

Kepler-138 d

Exoplanet 89 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 21m 31.54s
Declination
+43° 17′ 35.0″
Galactic l, b
75.107, 13.17
Magnitude V
13.04
Distance
66.862 pc

Also known as

1 identifiers

Kepler-138d

Planet

NASA Exoplanet Archive, composite parameters
Host starKepler-138 · M1V
DiscoveryTransit, 2014 · Kepler
Orbital period23.0923 d
Semi-major axis0.1288 au
Eccentricity0.01
Radius1.51 R⊕ · 0.1347 R♃
Mass2.1 M⊕ · 0.006607 M♃
Density3.6 g/cm³
Equilibrium temperature345 K
System distance66.862 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 4 values

ValueUnitUncertainty Band / methodSourceReferenceYear
2.1 M_earth ± 0.6 Transit NASA Exoplanet Archive Piaulet et al. 2023 2023
1.17 M_earth ± 0.3 Transit NASA Exoplanet Archive Almenara et al. 2018 2018
0.64 M_earth ± 0.674 Transit NASA Exoplanet Archive Jontof-Hutter et al. 2015 2015
1.01 M_earth ± 0.42 Transit NASA Exoplanet Archive Kipping et al. 2014 2014

Radius 15 values

ValueUnitUncertainty Band / methodSourceReferenceYear
1.33 R_earth ± 0.05 Transit NASA Exoplanet Archive Gaidos et al. 2024 2024
1.51 R_earth ± 0.04 Transit NASA Exoplanet Archive Piaulet et al. 2023 2023
1.68 R_earth ± 0.15 Transit NASA Exoplanet Archive Almenara et al. 2018 2018
1.323 R_earth ± 0.041 Transit NASA Exoplanet Archive Berger et al. 2018 2018
1.2 R_earth ± 0.11 Transit NASA Exoplanet Archive Mann et al. 2017 2017
1.63 R_earth ± 0.06 Transit NASA Exoplanet Archive Morton et al. 2016 2016
1.212 R_earth ± 0.075 Transit NASA Exoplanet Archive Jontof-Hutter et al. 2015 2015
2.06 R_earth Transit NASA Exoplanet Archive Q1-Q8 KOI Table 2014
1.52 R_earth ± 0.18 Transit NASA Exoplanet Archive Q1-Q12 KOI Table 2014
1.52 R_earth ± 0.18 Transit NASA Exoplanet Archive Q1-Q16 KOI Table 2014
1.61 R_earth ± 0.16 Transit NASA Exoplanet Archive Kipping et al. 2014 2014
1.52 R_earth ± 0.18 Transit NASA Exoplanet Archive Q1-Q17 DR24 KOI Table 2014
Show the remaining 3
ValueUnitUncertainty Band / methodSourceReferenceYear
1.24 R_earth ± 0.08 Transit NASA Exoplanet Archive Q1-Q17 DR25 KOI Table 2014
1.859 R_earth ± 0.092 Transit NASA Exoplanet Archive Mann et al. 2013 2013
1.26 R_earth ± 2.13 Transit NASA Exoplanet Archive Muirhead et al. 2012 2012

Orbital period 15 values

ValueUnitUncertainty Band / methodSourceReferenceYear
23.09 d Transit NASA Exoplanet Archive Gaidos et al. 2024 2024
23.0923 d ± 0.0006 Transit NASA Exoplanet Archive Piaulet et al. 2023 2023
23.09302 d ± 0.00069 Transit NASA Exoplanet Archive Almenara et al. 2018 2018
23.08892 d ± 2.32e-05 Transit NASA Exoplanet Archive Mann et al. 2017 2017
23.08902 d ± 2.71e-05 Transit NASA Exoplanet Archive Morton et al. 2016 2016
23.08899 d ± 3.16e-06 Transit NASA Exoplanet Archive Holczer et al. 2016 2016
23.0881 d ± 0.0009 Transit NASA Exoplanet Archive Jontof-Hutter et al. 2015 2015
23.08945 d ± 6.40e-05 Transit NASA Exoplanet Archive Q1-Q8 KOI Table 2014
23.08902 d ± 2.71e-05 Transit NASA Exoplanet Archive Q1-Q12 KOI Table 2014
23.08902 d ± 2.71e-05 Transit NASA Exoplanet Archive Q1-Q16 KOI Table 2014
23.08933 d ± 0.00071 Transit NASA Exoplanet Archive Kipping et al. 2014 2014
23.08902 d ± 2.41e-05 Transit NASA Exoplanet Archive Q1-Q17 DR25 Supplemental KOI Table 2014
Show the remaining 3
ValueUnitUncertainty Band / methodSourceReferenceYear
23.08902 d ± 2.71e-05 Transit NASA Exoplanet Archive Q1-Q17 DR24 KOI Table 2014
23.08902 d ± 2.41e-05 Transit NASA Exoplanet Archive Q1-Q17 DR25 KOI Table 2014
23.0904 d ± 0.00034 Transit NASA Exoplanet Archive Muirhead et al. 2012 2012

Semi-major axis 8 values

ValueUnitUncertainty Band / methodSourceReferenceYear
0.1288 au ± 0.001 Transit NASA Exoplanet Archive Piaulet et al. 2023 2023
0.1301 au ± 0.0056 Transit NASA Exoplanet Archive Almenara et al. 2018 2018
0.128 au Transit NASA Exoplanet Archive Q1-Q8 KOI Table 2014
0.1277 au Transit NASA Exoplanet Archive Q1-Q12 KOI Table 2014
0.1277 au Transit NASA Exoplanet Archive Q1-Q16 KOI Table 2014
0.1277 au Transit NASA Exoplanet Archive Q1-Q17 DR24 KOI Table 2014
0.1264 au Transit NASA Exoplanet Archive Q1-Q17 DR25 KOI Table 2014
0.12781 au ± 0.00456 Transit NASA Exoplanet Archive Muirhead et al. 2012 2012

Eccentricity 9 values

ValueUnitUncertainty Band / methodSourceReferenceYear
0.01 ± 0.005 Transit NASA Exoplanet Archive Piaulet et al. 2023 2023
0.027 ± 0.005 Transit NASA Exoplanet Archive Almenara et al. 2018 2018
0.01 ± 0.14 Transit NASA Exoplanet Archive Mann et al. 2017 2017
0 Transit NASA Exoplanet Archive Q1-Q8 KOI Table 2014
0 Transit NASA Exoplanet Archive Q1-Q12 KOI Table 2014
0 Transit NASA Exoplanet Archive Q1-Q16 KOI Table 2014
0.024 ± 0.03 Transit NASA Exoplanet Archive Kipping et al. 2014 2014
0 Transit NASA Exoplanet Archive Q1-Q17 DR24 KOI Table 2014
0 Transit NASA Exoplanet Archive Q1-Q17 DR25 KOI Table 2014

Equilibrium temperature 7 values

ValueUnitUncertainty Band / methodSourceReferenceYear
345 K ± 7 Transit NASA Exoplanet Archive Piaulet et al. 2023 2023
376 K Transit NASA Exoplanet Archive Q1-Q8 KOI Table 2014
335 K Transit NASA Exoplanet Archive Q1-Q12 KOI Table 2014
335 K Transit NASA Exoplanet Archive Q1-Q16 KOI Table 2014
335 K Transit NASA Exoplanet Archive Q1-Q17 DR24 KOI Table 2014
338 K Transit NASA Exoplanet Archive Q1-Q17 DR25 KOI Table 2014
335 K Transit NASA Exoplanet Archive Muirhead et al. 2012 2012

In the same field

within 9 arcmin · wider search
ObjectTypeSeparationV
Kepler-138 b Exoplanet 0.003074″ 13.04
Kepler-138 e Exoplanet 0.003074″ 13.04
Kepler-138 c Exoplanet 0.003074″ 13.04
Kepler-138 Eruptive* 0.4732″ 13.17
ATO J290.4061+43.2910 S* Candidate 65.31″ 12.57
UCAC4 667-073397 Star 71.19″ 16.02
2MASS J19214021+4316542 Star 103.1″ —
2MASS J19213153+4319449 Star 129.9″ —
2MASS J19213914+4319225 Star 135.8″ —
UCAC4 667-073427 HorBranch* 150.8″ 11.67
2MASS J19214069+4319399 Star 159.9″ —

Provenance

where this card came from
ArchiveRead at (UTC)Record
Seeded from the bulk archive load; no per-object fetch yet.

Machine-readable: /api/v1/object/kepler-138-d · Registry entry updated 2026-08-14.