K2-111

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
K2-111
K2-111 b	5.35 d	1.84 R_⨁	Transit	2017	Fridlund et al. 2017	Confirmed Planet
K2-111 c	15.67 d	> 11.1 M_⨁	Radial Velocity	2020	Mortier et al. 2020	Confirmed Planet

Exoplanet Archive Notes (1)

+

K2-111

Value for systemic velocity drawn from HARPS-N in ref. (Fridlund et al. 2017)

K2-111 Stellar Parameters (9 Solutions)

+

RA: 03h59m33.67s

Dec: +21d17m54.69s

Distance: 200.394+2.763-2.690
pc

Parallax: 4.9625900±0.0673735 mas

Ecliptic Latitude: .72498 deg

Ecliptic Longitude: 62.12843 deg

Galactic Latitude: -23.55083 deg

Galactic Longitude: 170.97857 deg

Total Proper Motion: 127.3664026±0.1770077 mas/yr

Proper Motion (RA): 122.337000±0.182304 mas/yr

Proper Motion (Dec): -35.4381000±0.0930225 mas/yr

Photometry: m_V
11.130±0.034; m_TESS
10.4561±0.0092; m_J
9.768±0.023; m_H
9.477±0.025; m_Ks
9.377±0.021; m_Kep
12.300; m_W1
9.321±0.023; m_W2
9.347±0.021; m_W3
9.213±0.034; m_W4
8.847±0.509; m_Gaia
10.929400±0.000621; m_B
11.796±0.026

Abundances (Hypatia Catalog): [Fe/H] -0.46±0.01 dex; [C/H] -0.23±0.09 dex; [Na/H] -0.48±0.04 dex; [Mg/H] -0.17±0.07 dex; [Al/H] -0.33±0.06 dex; [Ca/H] -0.26±0.06 dex; [BaII/H] -0.65±0.19 dex

Mission: K2 : Observed in Campaign 4

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

Source	Howard et al. 2025	Bonomo et al. 2023	Mortier et al. 2020	TICv8	Gaia DR2	Mayo et al. 2018	Fridlund et al. 2017	Kruse et al. 2019	Crossfield et al. 2016
T_eff (K)	5832.0±100.0	5775±70	5775±60	5969.0000+168.7390-98.0436	5476.0000+142.5000-40.3335	5741.0±50.0	5730±50	---	5788
L_✶ (log₁₀(L_⦿))	---	---	---	0.21935894+0.02345098-0.01585642	0.11944742+0.00750639-0.00763838	---	0.28+0.08-0.10	---	---
Metallicity (dex)	-0.440±0.044 [Fe/H]	-0.46±0.05 [Fe/H]	-0.46±0.05 [Fe/H]	---	---	-0.36±0.08 [Fe/H]	-0.53±0.05 [Fe/H]	---	---
γ (km/s)	---	---	-16.2752±0.0003	---	-16.656924887126053±0.719396076176295	---	-16.2120+0.0224-0.0224	---	---
Age (Gyr)	---	13.5+0.4-0.9	12.3±0.7	---	---	---	10.770±1.450	---	---
ρ_✶ (g/cm³)	---	---	0.60±0.03	0.88914220+0.20453200-0.18879830	---	---	0.51±0.16	---	---
M_✶ (M_⦿)	0.83±0.03	0.84±0.02	0.84±0.02	1.100000+0.134940-0.155755	---	0.876863 +0.035807-0.041355	0.88±0.02	---	---
R_✶ (R_⦿)	0.884±0.063	1.25±0.02	1.25±0.02	1.2037300+0.0640226-0.0581784	1.2748219+0.0189888-0.0638458	0.922706 +0.112762-0.075463	1.23±0.10	1.275 +0.064-0.019	1.17±0.11
log g (log₁₀(cm/s²))	4.43±0.08	---	4.25±0.15	4.3184000+0.0792784-0.0877925	---	4.36±0.1	4.15±0.10	---	4.224±0.078
v sin i (km/s)	0.10±1.00	---	1.1±0.5	---	---	---	---	---	---
Sp. T	---	---	G2	---	---	---	---	---	---
P_rot (days)	---	---	29.2±0.8	---	---	---	---	---	---
S Index	0.1411	---	---	---	---	---	---	---	---
CAII LOG RHK	-5.133	---	---	---	---	---	---	---	---

Print

K2-111 b Planetary Parameters (8 Solutions)

+

Status: Confirmed Planet

Detected By: Radial Velocity, Transit

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

Source	Palethorpe et al. 2026	Howard et al. 2025	Bonomo et al. 2023	Mortier et al. 2020	Mayo et al. 2018	Fridlund et al. 2017	Kruse et al. 2019	Crossfield et al. 2016
a/R_✶	9.73+0.22-0.23	---	---	---	10.356434 +1.754965-3.665210	9.590+0.980-0.950	9.9 +4.2-1.5	---
P (days)	5.3518963+0.0000089-0.0000120	5.35232±0.00035	5.35180±0.00040	5.3518±0.0004	5.351403 +0.000598-0.000612	5.35117±0.00055	5.35185 +0.00048-0.00050	5.35161±0.00063
R_p (R_⨁)	1.837+0.076-0.071	1.184+0.056-0.034	1.820+0.110-0.090	1.82+0.11-0.09	1.22263837414 +0.196062598311-0.124176451334	1.9±0.2	1.41 +0.15-0.39	2.09±0.52
R_p (R_Jup)	0.1639+0.0068-0.0063	0.1056+0.0050-0.0030	0.1624+0.0098-0.0080	0.162+0.010-0.008	0.1090764898 +0.0174915334-0.0110782810	0.17±0.02	0.126 +0.013-0.035	0.186±0.046
R_p/R_✶	0.0135±0.0006	---	---	0.01346+0.00074-0.00061	0.012148 +0.001261-0.000732	0.01255+0.00050-0.00048	0.01011 +0.00093-0.00276	0.0166±0.0038
δ (%)	---	---	---	---	---	---	0.01184±0.00064	---
T₁₄ (hours)	3.2362+0.2379-0.2494	---	---	3.19+0.36-0.48	---	3.38+0.11-0.10	3.60000+0.21600-0.28800	4.15920+0.30960-0.30960
T_C (days)	2459519.1348+0.0038-0.0054 (BJD)	2457067.9628±0.0024 (BJD)	2457100.0768±0.0019 (BJD-TDB)	2457100.0768+0.0019-0.0018 (BJD)	2457067.96909 +0.004638-0.004531	2457067.9704+0.0044-0.0039 (BJD-TDB)	2457062.6117 +0.0037-0.0036 (BJD)	2457067.9666±0.0047 (BJD)
T_eq (K)	1293±18	1019.0+44.0-45.0	1309±19	---	---	1309+71-63	---	---
S (S_⨁)	---	255.0+47.0-42.0	490±30	---	---	---	---	---
M_p (M_⨁)	5.35+0.68-0.69	5.4+2.2-2.1	5.58+0.74-0.73	5.29+0.76-0.77	---	8.60±3.90	---	---
M_p (M_Jup)	0.0168+0.0021-0.0022	0.017+0.007-0.007	0.0176+0.0023-0.0023	0.0166+0.0024-0.0024	---	0.0271±0.0123	---	---
ρ (g/cm³)	5.0654+0.9373-0.8932	13.8+7.3-5.9	5.0+1.1-1.0	4.8±1.0	---	6.60+4.50-3.20	---	---
e	0.134+0.093-0.071	---	<0.100	0.13+0.13-0.09	---	0	---	---
i (deg)	86.34+0.24-0.22	---	86.43+0.37-0.21	86.43+0.37-0.21	87.025748 +2.102391-4.258968	86.2±1.0	---	---
K (m/s)	2.23±0.28	---	2.30±0.30	2.21±0.32	---	3.1±1.4	---	---
a (au)	0.05650+0.00044-0.00045	---	0.05650±0.00045	0.0570±0.0012	---	0.0621+0.0092-0.0085	---	---
b	0.6022+0.0933-0.0795	---	---	0.309+0.292-0.216	---	0.633+0.091-0.128	---	---
ω (deg)	---	---	---	-69.30+73.90-27.50	---	---	---	---

Print

K2-111 c Planetary Parameters (3 Solutions)

+

Status: Confirmed Planet

Detected By: Radial Velocity

Tools: Planetary Systems; K2 Names; K2 Planets and Candidates

Source	Palethorpe et al. 2026	Bonomo et al. 2023	Mortier et al. 2020
ω (deg)	---	---	-79.60+96.30-150.10
M_p sin i (M_⨁)	11.1+1.1-1.0	11.08±1.03	11.3±1.1
M_p sin i (M_Jup)	0.0349+0.0035-0.0031	0.03486±0.00324	0.0356±0.0035
e	0.0690+0.0720-0.0490	<0.071	0.070+0.070-0.050
P (days)	15.6748+0.0062-0.0061	15.6805±0.0064	15.6785+0.0064-0.0063
K (m/s)	3.19±0.30	3.19±0.29	3.27+0.31-0.32
a (au)	0.11565±0.00092	0.11569±0.00094	0.1166±0.0025
a/R_✶	19.91+0.44-0.48	---	---
T_eq (K)	923±13	---	---
T_C (days)	---	2458119.62±0.33 (BJD-TDB)	---

Print

Nearby Data (within 30 arcseconds) Browse Nearby Data

+

Known Objects: 2 Confirmed Planets; 2 K2 Targets; 3 2MASS Point Source Catalog

Data Files: 1 SuperWASP Time Series; 2 K2 Time Series; 2 Associated Literature Data

Bibliography (13 References)

+

Constraining Small Planet Compositions for Future Missions
Palethorpe et al. 2026 Reference Overview
Planet Masses, Radii, and Orbits from NASA's K2 Mission
Howard et al. 2025 Reference Overview
Cold Jupiters and improved masses in 38 Kepler and K2 small planet systems from 3661 HARPS-N radial velocities. No excess of cold Jupiters in small planet systems
Bonomo et al. 2023 Reference Overview
K2-111: an old system with two planets in near-resonance
Mortier et al. 2020 Reference Overview
The Revised TESS Input Catalog and Candidate Target List
TICv8 Reference Overview
Detection of Hundreds of New Planet Candidates and Eclipsing Binaries in K2 Campaigns 0-8
Kruse et al. 2019 Reference Overview
Gaia Data Release 2
Gaia DR2 Reference Overview
275 Candidates and 149 Validated Planets Orbiting Bright Stars in K2 Campaigns 0-10
Mayo et al. 2018 Reference Overview
K2-111 b - a short period super-Earth transiting a metal poor, evolved old star
Fridlund et al. 2017 Reference Overview
197 Candidates and 104 Validated Planets in K2’s First Five Fields
Crossfield 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
All WISE Data Release
Cutri et al. 2014 Reference Overview
2MASS All-Sky Catalog of Point Sources
2MASS Point Source Catalog Reference Overview

Legend

+

System
Star
Confirmed
Candidate
False Positive Planet
Controversial
False Positive

Aliases
Data Access
Transit Prediction Service
Time Series
Kepler | K2

External Link
Search
Browse
Download

Debug Info

+

https://vmexoweb2.ipac.caltech.edu/data/Overviews_2.0/10/K2-111.json

Catalog Parameters

RA

ra

03h59m33.67s

Dec

dec

+21d17m54.69s

β

elat

.72498

λ

elon

62.12843

b

glat

-23.55083

l

glon

170.97857

m_V

sy_vmag

11.130±0.034

m_TESS

sy_tmag

10.4561±0.0092

m_J

sy_jmag

9.768±0.023

m_H

sy_hmag

9.477±0.025

m_Ks

sy_kmag

9.377±0.021

m_Kep

sy_kepmag

12.300

m_W1

sy_w1mag

9.321±0.023

m_W2

sy_w2mag

9.347±0.021

m_W3

sy_w3mag

9.213±0.034

m_W4

sy_w4mag

8.847±0.509

sy_icmag

no_data

m_Gaia

sy_gaiamag

10.929400±0.000621

m_B

sy_bmag

11.796±0.026

sy_gmag

no_data

sy_imag

no_data

sy_rmag

no_data

sy_umag

no_data

sy_zmag

no_data

μ

sy_pm

127.3664026±0.1770077

μ_δ

sy_pmdec

-35.4381000±0.0930225

μ_α

sy_pmra

122.337000±0.182304

π

sy_plx

4.9625900±0.0673735

Distance

sy_dist

200.394+2.763-2.690

Set Parameters

R_✶

st_rad

1.23±0.10

T_eff

st_teff

5730±50

K2-111 Overview

K2-111 Architecture & Discovery Information

K2-111