K2-39 | NASA Exoplanet Archive

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
K2-39
K2-39 b	4.61 d	6.28 R_⨁	Transit	2016	Van Eylen et al. 2016	Confirmed Planet

Exoplanet Archive Notes (1)

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K2-39 b

Typo in Table 2; transit durations mis-reported in hours. See literature discrepancies page. (Schmitt et al. 2016)

K2-39 Stellar Parameters (10 Solutions)

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RA: 22h33m28.37s

Dec: -09d01m22.59s

Distance: 307.470±4.656 pc

Parallax: 3.2244000±0.0488659 mas

Ecliptic Latitude: .05348 deg

Ecliptic Longitude: 336.64162 deg

Galactic Latitude: -52.74736 deg

Galactic Longitude: 55.42682 deg

Total Proper Motion: 56.7377939±0.0800522 mas/yr

Proper Motion (RA): -40.9478000±0.0864375 mas/yr

Proper Motion (Dec): -39.2741000±0.0724757 mas/yr

Photometry: m_V
10.831±0.025; m_TESS
9.9735±0.0073; m_J
9.082±0.024; m_H
8.594±0.042; m_Ks
8.516±0.024; m_Kep
10.581; m_W1
8.419±0.022; m_W2
8.514±0.021; m_W3
8.441±0.025; m_W4
8.338±0.435; m_Gaia
10.595900±0.000521; m_B
12.153±0.188; m_g
11.4948000±0.0005857; m_i
10.3292000±0.0005127; m_r
10.607200±0.000496; m_u
14.9806000±0.0068325; m_z
10.6531000±0.0018425

Abundances (Hypatia Catalog): [Fe/H] 0.41±0.04 dex; [C/H] 0.30±0.09 dex; [O/H] 0.27±0.09 dex; [Na/H] 0.42±0.04 dex; [Mg/H] 0.33±0.07 dex; [Al/H] 0.36±0.06 dex; [Si/H] 0.28±0.05 dex; [Ca/H] 0.39±0.06 dex; [Y/H] 0.35±0.08 dex

Mission: K2 : Observed in Campaign 3

Tools: Planetary Systems; ExoFOP Target Overview Page; IRSA Finding Chart; TOI; K2 Names; K2 Planets and Candidates; K2 Targets; Stellar Hosts; K2 Time Series

Source	Howard et al. 2025	TICv8	Gaia DR2	Petigura et al. 2017	Stassun et al. 2017	Van Eylen et al. 2016	Crossfield et al. 2016	ExoFOP	Schmitt et al. 2016	Vanderburg et al. 2016
T_eff (K)	4915.0±100.0	4911.0±25.0	4859.9700+99.6623-42.7600	4912±60	4881±20	4881±20	4993±72	4911±25	---	4843
M_✶ (M_⦿)	1.38±0.16	---	---	1.192+0.085-0.070	0.660±0.560	1.53+0.13-0.12	1.170±0.060	---	---	---
R_✶ (R_⦿)	3.08±0.14	3.12057	3.064995+0.054655-0.121943	2.93±0.21	2.97±0.77	3.88+0.48-0.42	2.59±0.21	3.120569944381714	---	0.74
log g (log₁₀(cm/s²))	3.58±0.08	---	---	3.58±0.05	3.44±0.07	3.44±0.07	3.682±0.056	4.438	---	---
Metallicity (dex)	0.430±0.043 [Fe/H]	0.39±0.10 [M/H]	---	0.43±0.04 [Fe/H]	0.32 [Fe/H]	0.32±0.04 [Fe/H]	---	---	---	---
ρ_✶ (g/cm³)	---	---	---	---	0.04±0.01	0.036+0.014-0.012	---	---	---	---
L_✶ (log₁₀(L_⦿))	---	---	0.67408873+0.00900674-0.00919753	---	---	---	---	---	---	---
γ (km/s)	---	---	24.345102360836577±0.592055252201677	---	---	---	---	---	---	---
v sin i (km/s)	0.10±1.00	---	---	0.1	---	2.01±0.50	---	---	---	---
Age (Gyr)	---	---	---	6.7+1.7-1.3	---	>3.09+0.92-0.70	---	---	---	---
S Index	0.173	---	---	---	---	---	---	---	---	---
CAII LOG RHK	-5.06	---	---	---	---	---	---	---	---	---

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K2-39 b Planetary Parameters (8 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity, Transit

Tools: Planetary Systems; Transit Prediction Service; TOI; K2 Names; K2 Planets and Candidates; Transit

Source	Stassun et al. 2017	Howard et al. 2025	Petigura et al. 2017	Van Eylen et al. 2016	Crossfield et al. 2016	ExoFOP	Schmitt et al. 2016	Vanderburg et al. 2016
b	---	---	---	0.57+0.15-0.20	---	---	0.04 +0.62-0.55	0.37
P (days)	4.60543±0.00046	4.60547±0.00047	4.60497±0.00077	4.60543±0.00046	4.60497±0.00071	4.608085407362772±0.004088831000000	4.6028 +0.0342-0.0289	4.6049829
R_p (R_⨁)	6.3±1.7	6.40+0.41-0.17	5.71±0.63	8.2±1.1	7.09±0.00	7.0446125187176225±1.3095409000000000	---	1.67
R_p (R_Jup)	0.56±0.15	0.571+0.037-0.015	0.509±0.056	0.73±0.10	0.633±0.000	0.62847931558287207±0.11682961502467393	---	0.149
R_p/R_✶	---	---	0.0179±0.0013	0.01925+0.00099-0.00076	0.0252±0.0027	---	0.0178 +0.0012-0.0006	0.01872
δ (%)	0.0370±0.0034	---	---	---	---	0.0435557816763854±0.0046338223000000	---	0.0432
T₁₄ (hours)	---	---	---	---	0.0±1.4	8.903721512659553±0.669903200000000	8.18400+0.19200-0.21600	8.79000
T_C (days)	---	2456985.4268±0.0038 (BJD)	2456985.4315±0.0058 (BJD)	2456980.8236±0.0039 (BJD)	2456985.4315±0.0054 (BJD-TDB)	2460807.33247700±0.01064087 (BJD)	2456980.821 +0.0047-0.0041 (BJD)	2456980.828 (BJD)
T_eq (K)	---	1550.0+58.0-55.0	1670±54	---	---	1124.9925994318244	---	---
S (S_⨁)	---	1370.0+220.0-180.0	1356±175	---	1148±201	378.54687370389775	---	---
M_p (M_⨁)	29±16	37.6+5.3-4.8	39.8±4.4	50.3+9.7-9.4	---	---	---	---
M_p (M_Jup)	0.090±0.050	0.118+0.017-0.015	0.125±0.014	0.158+0.031-0.030	---	---	---	---
e	0.0	---	0.152+0.084-0.068	0	---	---	---	---
ρ (g/cm³)	---	0.930+0.250-0.190	1.17+0.47-0.32	0.50+0.29-0.17	---	---	---	---
K (m/s)	14.4±2.6	---	13.8±1.4	14.4±2.6	---	---	---	---
a (au)	---	---	0.0574±0.0012	0.062+0.010-0.012	0.05708±0.00098	---	---	---
a/R_✶	3.41±0.42	---	---	3.41+0.39-0.45	---	---	3.8 +0.5-0.7	---
i (deg)	80.39±4.19	---	---	80.39+3.99-4.39	---	---	83.4 +4.6-6.9	---

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Nearby Data (within 30 arcseconds) Browse Nearby Data

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Known Objects: 1 Confirmed Planets; 1 K2 Targets; 1 2MASS Point Source Catalog

Data Files: 1 K2 Time Series; 1 Associated Literature Data

Bibliography (13 References)

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Planet Masses, Radii, and Orbits from NASA's K2 Mission
Howard et al. 2025 Reference Overview
The Revised TESS Input Catalog and Candidate Target List
TICv8 Reference Overview
Gaia Data Release 2
Gaia DR2 Reference Overview
ExoFOP TOI Table
ExoFOP
Four Sub-Saturns with Dissimilar Densities: Windows into Planetary Cores and Envelopes
Petigura et al. 2017 Reference Overview
Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes
Stassun et al. 2017 Reference Overview
The K2-ESPRINT Project V: A Short-period Giant Planet Orbiting a Subgiant Star*
Van Eylen et al. 2016 Reference Overview
197 Candidates and 104 Validated Planets in K2’s First Five Fields
Crossfield et al. 2016 Reference Overview
Planet Hunters. X. Searching for Nearby Neighbors of 75 Planet and Eclipsing Binary Candidates from the K2 Kepler extended mission
Schmitt et al. 2016 Reference Overview
The K2 Ecliptic Plane Input Catalog (EPIC) and Stellar Classifications of 138,600 Targets in Campaigns 1-8
EPIC Catalog Reference Overview
Planetary Candidates from the First Year of the K2 Mission
Vanderburg et al. 2016 Reference Overview
All WISE Data Release
Cutri et al. 2014 Reference Overview
2MASS All-Sky Catalog of Point Sources
2MASS Point Source Catalog Reference Overview

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