UPSA Object Registry
Registry · exoplanet

Kepler-138 c

Exoplanet 82 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-138c

Planet

NASA Exoplanet Archive, composite parameters
Host starKepler-138 · M1V
DiscoveryTransit, 2014 · Kepler
Orbital period13.7815 d
Semi-major axis0.0913 au
Eccentricity0.017
Radius1.51 R⊕ · 0.1347 R♃
Mass2.3 M⊕ · 0.007237 M♃
Density3.6 g/cm³
Equilibrium temperature410 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 5 values

ValueUnitUncertainty Band / methodSourceReferenceYear
2.3 M_earth ± 0.6 Transit NASA Exoplanet Archive Piaulet et al. 2023 2023
5.2 M_earth ± 1.2 Transit NASA Exoplanet Archive Almenara et al. 2018 2018
1.97 M_earth ± 1.912 Transit NASA Exoplanet Archive Jontof-Hutter et al. 2015 2015
1.6 M_earth ± 2.4 Transit NASA Exoplanet Archive Hadden et al. 2014 2014
3.83 M_earth ± 1.51 Transit NASA Exoplanet Archive Kipping et al. 2014 2014

Radius 16 values

ValueUnitUncertainty Band / methodSourceReferenceYear
1.5 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
1.67 R_earth ± 0.15 Transit NASA Exoplanet Archive Almenara et al. 2018 2018
1.519 R_earth ± 0.136 Transit NASA Exoplanet Archive Berger et al. 2018 2018
1.17 R_earth ± 0.07 Transit NASA Exoplanet Archive Mann et al. 2017 2017
1.4 R_earth ± 0.06 Transit NASA Exoplanet Archive Morton et al. 2016 2016
1.197 R_earth ± 0.07 Transit NASA Exoplanet Archive Jontof-Hutter et al. 2015 2015
1.33 R_earth ± 0.16 Transit NASA Exoplanet Archive Q1-Q16 KOI Table 2014
1.33 R_earth ± 0.16 Transit NASA Exoplanet Archive Q1-Q17 DR24 KOI Table 2014
1.42 R_earth ± 0.09 Transit NASA Exoplanet Archive Q1-Q17 DR25 KOI Table 2014
1.75 R_earth ± 0.1 Transit NASA Exoplanet Archive Hadden et al. 2014 2014
1.61 R_earth ± 0.16 Transit NASA Exoplanet Archive Kipping et al. 2014 2014
Show the remaining 4
ValueUnitUncertainty Band / methodSourceReferenceYear
1.94 R_earth Transit NASA Exoplanet Archive Q1-Q8 KOI Table 2014
1.33 R_earth ± 0.16 Transit NASA Exoplanet Archive Q1-Q12 KOI Table 2014
1.751 R_earth ± 0.101 Transit NASA Exoplanet Archive Mann et al. 2013 2013
1.58 R_earth ± 0.18 Transit NASA Exoplanet Archive Muirhead et al. 2012 2012

Orbital period 17 values

ValueUnitUncertainty Band / methodSourceReferenceYear
13.78 d Transit NASA Exoplanet Archive Gaidos et al. 2024 2024
13.7815 d ± 7.00e-05 Transit NASA Exoplanet Archive Piaulet et al. 2023 2023
13.7811 d ± 6.03e-06 Transit NASA Exoplanet Archive Gajdoš et al. 2019 2019
13.78156 d ± 8.20e-05 Transit NASA Exoplanet Archive Almenara et al. 2018 2018
13.78111 d ± 7.50e-06 Transit NASA Exoplanet Archive Mann et al. 2017 2017
13.78109 d ± 1.05e-05 Transit NASA Exoplanet Archive Morton et al. 2016 2016
13.78109 d ± 8.90e-07 Transit NASA Exoplanet Archive Holczer et al. 2016 2016
13.7813 d ± 0.0001 Transit NASA Exoplanet Archive Jontof-Hutter et al. 2015 2015
13.78109 d ± 1.05e-05 Transit NASA Exoplanet Archive Q1-Q16 KOI Table 2014
13.78109 d ± 1.05e-05 Transit NASA Exoplanet Archive Q1-Q17 DR24 KOI Table 2014
13.78109 d ± 1.03e-05 Transit NASA Exoplanet Archive Q1-Q17 DR25 KOI Table 2014
13.78109 d ± 1.03e-05 Transit NASA Exoplanet Archive Q1-Q17 DR25 Supplemental KOI Table 2014
Show the remaining 5
ValueUnitUncertainty Band / methodSourceReferenceYear
13.781 d Transit NASA Exoplanet Archive Hadden et al. 2014 2014
13.78164 d ± 0.00019 Transit NASA Exoplanet Archive Kipping et al. 2014 2014
13.78105 d ± 2.50e-05 Transit NASA Exoplanet Archive Q1-Q8 KOI Table 2014
13.78109 d ± 1.05e-05 Transit NASA Exoplanet Archive Q1-Q12 KOI Table 2014
13.78105 d ± 0.00016 Transit NASA Exoplanet Archive Muirhead et al. 2012 2012

Semi-major axis 8 values

ValueUnitUncertainty Band / methodSourceReferenceYear
0.0913 au ± 0.0007 Transit NASA Exoplanet Archive Piaulet et al. 2023 2023
0.0922 au ± 0.004 Transit NASA Exoplanet Archive Almenara et al. 2018 2018
0.0905 au Transit NASA Exoplanet Archive Q1-Q16 KOI Table 2014
0.0905 au Transit NASA Exoplanet Archive Q1-Q17 DR24 KOI Table 2014
0.0896 au Transit NASA Exoplanet Archive Q1-Q17 DR25 KOI Table 2014
0.091 au Transit NASA Exoplanet Archive Q1-Q8 KOI Table 2014
0.0905 au Transit NASA Exoplanet Archive Q1-Q12 KOI Table 2014
0.0906 au ± 0.00324 Transit NASA Exoplanet Archive Muirhead et al. 2012 2012

Eccentricity 9 values

ValueUnitUncertainty Band / methodSourceReferenceYear
0.017 ± 0.008 Transit NASA Exoplanet Archive Piaulet et al. 2023 2023
0.011 ± 0.0069 Transit NASA Exoplanet Archive Almenara et al. 2018 2018
0.01 ± 0.18 Transit NASA Exoplanet Archive Mann et al. 2017 2017
0 Transit NASA Exoplanet Archive Q1-Q16 KOI Table 2014
0 Transit NASA Exoplanet Archive Q1-Q17 DR24 KOI Table 2014
0 Transit NASA Exoplanet Archive Q1-Q17 DR25 KOI Table 2014
0.05 ± 0.049 Transit NASA Exoplanet Archive Kipping et al. 2014 2014
0 Transit NASA Exoplanet Archive Q1-Q8 KOI Table 2014
0 Transit NASA Exoplanet Archive Q1-Q12 KOI Table 2014

Equilibrium temperature 7 values

ValueUnitUncertainty Band / methodSourceReferenceYear
410 K ± 8 Transit NASA Exoplanet Archive Piaulet et al. 2023 2023
398 K Transit NASA Exoplanet Archive Q1-Q16 KOI Table 2014
398 K Transit NASA Exoplanet Archive Q1-Q17 DR24 KOI Table 2014
402 K Transit NASA Exoplanet Archive Q1-Q17 DR25 KOI Table 2014
446 K Transit NASA Exoplanet Archive Q1-Q8 KOI Table 2014
398 K Transit NASA Exoplanet Archive Q1-Q12 KOI Table 2014
398 K Transit NASA Exoplanet Archive Muirhead et al. 2012 2012

In the same field

within 9 arcmin · wider search
ObjectTypeSeparationV
Kepler-138 e Exoplanet 0.003074″ 13.04
Kepler-138 b Exoplanet 0.003074″ 13.04
Kepler-138 d 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-c · Registry entry updated 2026-08-14.