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K2-222 Overview

K2-222 1.09 R⦿ 6058.00 K
K2-222 b
0.203 RJup

K2-222 Architecture & Discovery Information

Name Orbital Separation Planet Size Method Year Reference Disposition
K2-222
K2-222 b 15.39 d 2.28 R⨁ Transit 2018 Mayo et al. 2018 Confirmed Planet
RA
01h05m51.00s
Dec
+11d45m13.38s
Distance
101.321+0.632-0.625
pc
Parallax
9.8412700±0.0607778 mas
Ecliptic Latitude
4.38938 deg
Ecliptic Longitude
19.66406 deg
Galactic Latitude
-50.96109 deg
Galactic Longitude
128.53772 deg
Total Proper Motion
86.9642815±0.1057362 mas/yr
Proper Motion (RA)
55.296400±0.106623 mas/yr
Proper Motion (Dec)
67.12000±0.10513 mas/yr
Photometry
mV
9.543±0.004
mTESS
8.97055±0.00620
mJ
8.423±0.023
mH
8.169±0.034
mKs
8.105±0.017
mKep
9.443
mW1
8.052±0.023
mW2
8.096±0.020
mW3
8.069±0.022
mW4
7.920±0.183
mGaia
9.360720±0.000292
mB
10.038±0.057
Abundances
(Hypatia Catalog)
[Fe/H] -0.31±0.04 dex
[C/H] -0.19±0.09 dex
[O/H] -0.32±0.09 dex
[Na/H] -0.38±0.04 dex
[Mg/H] -0.27±0.07 dex
[Al/H] -0.41±0.06 dex
[Si/H] -0.27±0.05 dex
[Ca/H] -0.26±0.06 dex
[Y/H] -0.32±0.08 dex
Mission
K2 : Observed in Campaign 8
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 Bonomo et al. 2023 Nava et al. 2022 TICv8 Livingston et al. 2018 Gaia DR2 Mayo et al. 2018 Petigura et al. 2018 ExoFOP
Teff
(K)
5961.0±100.0 5942±119 5942±119
6101.000+123.515-132.278
 6058±89
5902.7+45.6-31.7
 5934.0±50.0 --- 6101.000±127.896
Metallicity
(dex)
-0.250±0.044 [Fe/H] -0.315±0.060 [Fe/H] -0.315±0.060 [Fe/H] --- -0.21±0.06 [Fe/H] --- -0.3±0.08 [Fe/H] --- ---
ρ✶
(g/cm3)
--- ---
1.1+0.1-0.1
1.3489190+0.3046987-0.3047227
1.250+0.694-0.498
 --- --- --- ---
M✶
(M⦿)
0.92±0.04
0.9890+0.0700-0.0650
 0.94±0.05
1.147000+0.145822-0.167428
 1.00±0.04 ---
0.950497 +0.039773-0.035511
--- ---
R✶
(R⦿)
1.093±0.038 1.115±0.029 1.072±0.043
1.0623000+0.0466045-0.0531945
 1.09±0.02
1.1215291+0.0121440-0.0171294
1.040375 +0.126390-0.095784
0.96 1.06229996681213±0.04989950000000
log g
(log10(cm/s2))
4.33±0.08 --- 4.35±0.02
4.4451400+0.0881016-0.0768092
 4.37±0.03 --- 4.29±0.1 --- 4.4451400±0.0824554
L✶
(log10(L⦿))
--- ---
0.127+0.013-0.013
0.14879416+0.01772195-0.01410226
 ---
0.13851865+0.00350561-0.00353413
 --- --- ---
γ
(km/s)
--- --- --- --- --- 1.4840781596733663±0.6312995907373408 --- --- ---
Age
(Gyr)
---
7.1+1.5-1.7
7.1+1.5-1.7
 --- --- --- --- --- ---
v sin i
(km/s)
1.6±1.0 --- 3.1±0.5 --- --- --- --- --- ---
S Index
0.1407 --- --- --- --- --- --- --- ---
CAII LOG RHK
-5.128 --- --- --- --- --- --- --- ---
Sp. T
--- --- G0 --- --- --- --- --- ---
Print
Status
Confirmed Planet
Detected By
Radial Velocity, Transit
Tools
Planetary Systems
Transit Prediction Service
TOI
K2 Names
K2 Planets and Candidates
Transit
Source Palethorpe et al. 2026 Howard et al. 2025 Bonomo et al. 2023 Nava et al. 2022 Livingston et al. 2018 Mayo et al. 2018 Petigura et al. 2018 ExoFOP
b
0.4512+0.1359-0.1573
 --- ---
0.31+0.19-0.20
0.41+0.33-0.28
 ---
0.47 +0.30-0.32
---
P
(days)
15.3889274+0.0000099-0.0000110
 15.3863±0.0014 15.38857±0.00088 15.38857±0.00088
15.387063+0.001815-0.001876
15.388825 +0.000993-0.000963
15.386796 +0.001829-0.001912
15.3886606556006±0.0001562771500
Rp
(R⨁)
2.275±0.100
2.41+0.17-0.08
2.350+0.080-0.070
2.35+0.08-0.07
 2.39±0.13
2.22325950553 +0.33530681516-0.221397481924
2.1 +0.3-0.2
2.53826376884531±0.23958570000000
Rp
(RJup)
0.2030±0.0089
0.215+0.015-0.007
0.2097+0.0071-0.0062
0.210+0.007-0.006
 0.213±0.012
0.1983459279 +0.0299140704-0.0197517604
0.19 +0.03-0.02
0.226449115827750±0.021374441299555
Rp/R✶
0.0195±0.0012 --- ---
0.01928+0.00040-0.00035
0.0201+0.0013-0.0008
0.019592 +0.001751-0.000744
0.0202 +0.0022-0.0010
---
T14
(hours)
4.3820+0.4061-0.4838
 --- ---
4.406+0.067-0.060
 --- ---
4.38960+0.17040-0.16080
 4.33006432752769±0.44330654000000
TC
(days)
2459491.95470+0.00083-0.00091
(BJD)
2457399.0652±0.0042
(BJD)
2457399.0595±0.0016
(BJD-TDB)
2457399.0595±0.0016
(BJD)
2457399.06512+0.00465-0.00434
(BJD)
2457399.05993 +0.002105-0.002182
2457399.06596 +0.004595-0.004334
(BJD)
2459461.18112300±0.00519471
(BJD)
a/R✶
24.0+1.3-1.5
 --- --- ---
25.07+2.40-6.50
23.382130 +3.166908-7.660524
--- ---
Teq
(K)
803+24-25
 801.0±20.0 871±23
878+17-15
 801±14 --- --- 779.17124374885
a
(au)
0.1186±0.0021 --- 0.1206±0.0029 ---
0.1211+0.0016-0.0017
 --- --- ---
S
(S⨁)
--- 98.0±10.0
96.00+11.00-9.70
 95±5 --- --- --- 87.1069215844062
Mp
(M⨁)
7.5±1.5 5.7±2.6 8.70±1.70 8.0±1.8 --- --- --- ---
Mp
(MJup)
0.024±0.005 0.018±0.008 0.0274±0.0053 0.025±0.006 --- --- --- ---
e
0.021+0.051-0.017
 --- <0.16 --- --- --- --- ---
i
(deg)
88.91+0.36-0.32
 ---
89.12+0.55-0.41
89.12+0.55-0.41
 ---
88.790774 +0.892292-1.751858
--- ---
ρ
(g/cm3)
3.721+0.956-0.862
 2.0±1.0
3.68+0.86-0.77
 3.4±0.8 --- --- --- ---
K
(m/s)
2.01+0.39-0.40
 --- 2.29±0.43 --- --- --- --- ---
δ
(%)
--- --- ---
0.0372+0.0016-0.0013
 --- --- --- 0.0407105054467919±0.0041741627000000
Print
Known Objects
1 Confirmed Planets
1 K2 Targets
1 2MASS Point Source Catalog
Data Files
1 K2 Time Series
1 Associated Literature Data
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