K2-181

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
K2-181
K2-181 b	6.89 d	2.69 R_⨁	Transit	2018	Mayo et al. 2018	Confirmed Planet

K2-181 Stellar Parameters (10 Solutions)

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RA: 08h30m12.99s

Dec: +10d54m36.52s

Distance: 360.911+5.351-5.201
pc

Parallax: 2.7424500±0.0401933 mas

Ecliptic Latitude: -7.81632 deg

Ecliptic Longitude: 127.16069 deg

Galactic Latitude: 26.83381 deg

Galactic Longitude: 214.12703 deg

Total Proper Motion: 37.3382669±0.0505675 mas/yr

Proper Motion (RA): 16.9173000±0.0683317 mas/yr

Proper Motion (Dec): -33.2859000±0.0448496 mas/yr

Photometry: m_V
12.669±0.103; m_TESS
12.0873±0.0060; m_J
11.438±0.022; m_H
11.082±0.021; m_Ks
11.026±0.021; m_Kep
12.637; m_W1
10.999±0.023; m_W2
11.062±0.023; m_W3
11.041±0.205; m_W4
8.319; m_Gaia
12.561800±0.000189; m_B
13.502±0.025; m_g
15.24400±0.01111; m_i
12.4471000±0.0010501; m_r
12.6189000±0.0013149; m_u
15.2847000±0.0062841; m_z
13.3819000±0.0062538

Abundances (Hypatia Catalog): [Fe/H] 0.27±0.04 dex; [Mg/H] 0.41±0.07 dex

Mission: K2 : Observed in Campaigns 5, 18

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	Thygesen et al. 2023	TICv8	Livingston et al. 2018	Gaia DR2	Mayo et al. 2018	Kruse et al. 2019	Petigura et al. 2018	Barros et al. 2016	Pope et al. 2016
T_eff (K)	5528.0±100.0	5520.0+100.0-110.0	5573.000+152.818-94.267	5608±91	5513.75+179.25-133.75	5609.0±50.0	---	---	---	---
Metallicity (dex)	0.180±0.047 [Fe/H]	0.385±0.057 [Fe/H]	---	0.23±0.06 [Fe/H]	---	0.42±0.08 [Fe/H]	---	---	---	---
M_✶ (M_⦿)	0.96±0.04	1.022+0.060-0.058	0.9830000+0.1269060-0.1199420	0.990±0.040	---	1.043879 +0.023942-0.028795	---	---	---	---
R_✶ (R_⦿)	1.060±0.042	1.040+0.043-0.039	1.0573400+0.0462206-0.0652869	1.07±0.02	1.0708260+0.0539046-0.0663706	0.999244 +0.077057-0.041150	1.071 +0.066-0.054	1.11	---	---
log g (log₁₀(cm/s²))	4.350±0.085	4.413+0.047-0.050	4.3821900+0.0775659-0.0775136	4.38±0.03	---	4.46±0.1	---	---	---	---
L_✶ (log₁₀(L_⦿))	---	-0.0443+0.0179-0.0177	-0.012522864+0.013548238-0.021803520	---	-0.02007917+0.00931148-0.00951550	---	---	---	---	---
γ (km/s)	---	---	---	---	-60.377086502347460±1.500900053185786	---	---	---	---	---
ρ_✶ (g/cm³)	---	1.28+0.19-0.18	1.1724101+0.2809530-0.2230289	2.639+1.613-1.140	---	---	---	---	---	---
Age (Gyr)	---	5.90+4.50-3.80	---	---	---	---	---	---	---	---
v sin i (km/s)	2.1±1.0	---	---	---	---	---	---	---	---	---
S Index	0.183	---	---	---	---	---	---	---	---	---
CAII LOG RHK	-4.914	---	---	---	---	---	---	---	---	---

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K2-181 b Planetary Parameters (8 Solutions)

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Status: Confirmed Planet

Detected By: Transit

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

Source	Howard et al. 2025	Thygesen et al. 2023	Livingston et al. 2018	Mayo et al. 2018	Kruse et al. 2019	Petigura et al. 2018	Barros et al. 2016	Pope et al. 2016
P (days)	6.89410±0.00043	6.893813±0.000011	6.894256+0.000704-0.000722	6.894252 +0.000430-0.000426	6.89442 +0.00025-0.00024	6.894287 +0.000757-0.000759	6.89424037	6.893
δ (%)	---	0.0618+0.0083-0.0041	---	---	0.0828 +0.0027-0.0026	---	0.046±0.004	0.0585
T₁₄ (hours)	---	2.5200+0.0672-0.0624	---	---	2.67120+0.08640-0.12480	2.44080+0.14880-0.16080	2.22400	2.46792
T_C (days)	2457143.7948±0.0025 (BJD)	2457778.0262±0.0012 (BJD-TDB)	2457143.79263+0.00402-0.00423 (BJD)	2457143.79355 +0.002559-0.002528	2457143.7935 +0.0014-0.0015 (BJD)	2457143.79266 +0.004435-0.004802 (BJD)	2457143.794763 (BJD)	2457143.799 (BJD)
b	---	0.48+0.25-0.33	0.43+0.32-0.29	---	---	0.49 +0.31-0.34	---	0
R_p (R_⨁)	2.69+0.21-0.09	2.84+0.21-0.16	2.84±0.20	2.70624390594 +0.308465466239-0.183648017687	3.17 +0.28-0.51	2.8 +0.4-0.3	---	---
R_p (R_Jup)	0.240+0.019-0.008	0.253+0.019-0.014	0.253±0.018	0.2414349100 +0.0275194456-0.0163839787	0.283 +0.025-0.045	0.25 +0.04-0.03	---	---
R_p/R_✶	---	0.02485+0.00160-0.00085	0.0244+0.0020-0.0012	0.024829 +0.002084-0.001339	0.0272 +0.0017-0.0041	0.0228 +0.0021-0.0013	---	0.024185
T_eq (K)	949.0±26.0	1015.0±13.0	962±20	---	---	---	---	---
S (S_⨁)	192.0+22.0-21.0	---	---	---	---	---	---	---
a/R_✶	---	14.76+0.71-0.72	18.79+2.18-4.83	18.422692 +2.183026-4.814098	17.7 +5.5-2.5	---	---	---
a (au)	---	0.0714±0.0014	0.0706±0.0010	---	---	---	---	---
ω (deg)	---	20.00+110.00-180.00	---	---	---	---	---	---
e	---	0.40+0.30-0.22	---	---	---	---	---	---
i (deg)	---	87.40+1.50-0.71	---	88.615919 +0.983418-1.807891	---	---	---	---

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Nearby Data (within 30 arcseconds) Browse Nearby Data

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Known Objects: 1 Confirmed Planets; 2 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 K2 and TESS Synergy. II. Revisiting 26 Systems in the TESS Primary Mission
Thygesen et al. 2023 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
Sixty Validated Planets from K2 Campaigns 5-8
Livingston et al. 2018 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
Planet Candidates from K2 Campaigns 5─8 and Follow-up Optical Spectroscopy
Petigura et al. 2018 Reference Overview
New planetary and eclipsing binary candidates from campaigns 1-6 of the K2 mission
Barros et al. 2016 Reference Overview
Transiting exoplanet candidates from K2 Campaigns 5 and 6
Pope 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

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System
Star
Confirmed
Candidate
False Positive Planet
Controversial
False Positive

Aliases
Data Access
Transit Prediction Service
Time Series
Kepler | K2

External Link
Search
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Download

Debug Info

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https://vmexoweb2.ipac.caltech.edu/data/Overviews_2.0/11/K2-181.json

Catalog Parameters

RA

ra

08h30m12.99s

Dec

dec

+10d54m36.52s

β

elat

-7.81632

λ

elon

127.16069

b

glat

26.83381

l

glon

214.12703

m_V

sy_vmag

12.669±0.103

m_TESS

sy_tmag

12.0873±0.0060

m_J

sy_jmag

11.438±0.022

m_H

sy_hmag

11.082±0.021

m_Ks

sy_kmag

11.026±0.021

m_Kep

sy_kepmag

12.637

m_W1

sy_w1mag

10.999±0.023

m_W2

sy_w2mag

11.062±0.023

m_W3

sy_w3mag

11.041±0.205

m_W4

sy_w4mag

8.319

sy_icmag

no_data

m_Gaia

sy_gaiamag

12.561800±0.000189

m_B

sy_bmag

13.502±0.025

m_g

sy_gmag

15.24400±0.01111

m_i

sy_imag

12.4471000±0.0010501

m_r

sy_rmag

12.6189000±0.0013149

m_u

sy_umag

15.2847000±0.0062841

m_z

sy_zmag

13.3819000±0.0062538

μ

sy_pm

37.3382669±0.0505675

μ_δ

sy_pmdec

-33.2859000±0.0448496

μ_α

sy_pmra

16.9173000±0.0683317

π

sy_plx

2.7424500±0.0401933

Distance

sy_dist

360.911+5.351-5.201

Set Parameters

R_✶

st_rad

0.999244 +0.077057-0.041150

T_eff

st_teff

5609.0±50.0

K2-181 Overview

K2-181 Architecture & Discovery Information

K2-181