K2-223 Overview
-
Star:
K2-223
- Stellar Radius: 1.00 Solar Radius
- Stellar Effective Temperature: 5859.00 K
-
Planet:
K2-223 b
- Disposition Confirmed
- Planet Radius 0.070 Jupiter Radius
-
Planet:
K2-223 c
- Disposition Confirmed
- Planet Radius 0.126 Jupiter Radius
-
Planet:
K2-223 d
- Disposition Candidate
K2-223 Architecture & Discovery Information
| Name | Orbital Separation | Planet Size | Method | Year | Reference | Disposition |
|---|---|---|---|---|---|---|
| K2-223 | ||||||
| K2-223 b | 0.51 d | 0.79 R⨁ | Transit | 2018 | Mayo et al. 2018 | Confirmed Planet |
| K2-223 c | 4.56 d | 1.41 R⨁ | Transit | 2018 | Mayo et al. 2018 | Confirmed Planet |
| K2-223 d | 1653 d | > 410 M⨁ | Radial Velocity | 2026 | Jankowski et al. 2026 | Candidate Planet |
- RA
- 12h21m13.48s
- Dec
- -10d16m55.53s
- Distance
-
198.604+2.567-2.503pc
- Parallax
- 5.0074400±0.0637652 mas
- Ecliptic Latitude
- -7.32923 deg
- Ecliptic Longitude
- 188.9569 deg
- Galactic Latitude
- 51.87879 deg
- Galactic Longitude
- 290.83817 deg
- Total Proper Motion
- 16.7520877±0.0746179 mas/yr
- Proper Motion (RA)
- 7.377930±0.111893 mas/yr
- Proper Motion (Dec)
- -15.0399000±0.0624084 mas/yr
- Photometry
- mV 11.443±0.057
- mTESS 10.8242±0.0061
- mJ 10.177±0.024
- mH 9.946±0.024
- mKs 9.835±0.024
- mKep 11.325
- mW1 9.800±0.023
- mW2 9.825±0.020
- mW3 9.510±0.041
- mW4 8.472±0.327
- mGaia 11.273600±0.000792
- mB 12.132±0.027
-
Abundances
(Hypatia Catalog) - [Fe/H] 0.20±0.04 dex
- [C/H] 0.05±0.09 dex
- [Na/H] 0.02±0.04 dex
- [Mg/H] 0.30±0.10 dex
- [Al/H] 0.09±0.06 dex
- [Ca/H] 0.21±0.06 dex
- [BaII/H] 0.24±0.19 dex
- Mission
- K2: Observed in Campaign 10
| Source | Jankowski et al. 2026 | Adams et al. 2021 | TICv8 | Livingston et al. 2018 | Gaia DR2 | Mayo et al. 2018 |
|---|---|---|---|---|---|---|
|
Teff
(K)
|
5858±26 | 5859±50 |
5819.000+138.055-131.254
|
5835+38-40
|
5727.0+209.0-174.0
|
5859.0±50.0 |
|
Metallicity
(dex)
|
0.18±0.06 [Fe/H] | 0.19±0.08 [Fe/H] | --- | 0.12±0.06 [Fe/H] | --- | 0.19±0.08 [Fe/H] |
|
R✶
(R⦿)
|
1.05±0.10 | 1.00±0.06 |
0.98367100+0.05965020-0.03713370
|
0.99±0.01 |
0.975181460+0.062070900-0.067461300
|
1.013236 +0.055423-0.034643
|
|
log g
(log10(cm/s2))
|
4.56±0.16 | 4.5±0.1 |
4.4723100+0.0636050-0.0884559
|
4.48±0.01 | --- | 4.54±0.1 |
|
L✶
(log10(L⦿))
|
-0.00436+0.06506-0.07656
|
--- |
-0.00021177018+0.01512027055-0.02688580583
|
--- |
-0.03542568+0.00712708-0.00724604
|
--- |
|
γ
(km/s)
|
9.3547±0.0007 | --- | --- | --- | 9.4041846043214328±0.4553235304678005 | --- |
|
v sin i
(km/s)
|
2.0+0.8-1.2
|
--- | --- | --- | --- | --- |
|
Age
(Gyr)
|
2.8±2.8 | --- | --- | --- | --- | --- |
|
ρ✶
(g/cm3)
|
1.61+0.28-0.37
|
--- |
1.5508230+0.4110504-0.2176617
|
--- | --- | --- |
|
M✶
(M⦿)
|
1.07±0.07 | --- |
1.047000+0.153469-0.111170
|
1.06±0.02 | --- |
1.067005 +0.026157-0.025933
|
|
CAII LOG RHK
|
-4.847±0.049 | --- | --- | --- | --- | --- |
|
Sp. T
|
G1 V | --- | --- | --- | --- | --- |
|
Prot
(days)
|
26±10 | --- | --- | --- | --- | --- |
- Status
- Confirmed Planet
- Detected By
- Transit
| Source | Jankowski et al. 2026 | Adams et al. 2021 | Livingston et al. 2018 | Mayo et al. 2018 |
|---|---|---|---|---|
|
a/R✶
|
2.79+0.16-0.23
|
3.3+0.8-0.7
|
3.9+1.1-0.9
|
3.397324 +0.668711-1.174775
|
|
Teq
(K)
|
2480+103-72
|
--- | 2271±23 | --- |
|
b
|
0.57+0.15-0.21
|
--- |
0.41+0.32-0.28
|
--- |
|
ω
(deg)
|
90 | --- | --- | --- |
|
Mp
(M⨁)
|
<2.8 | --- | --- | --- |
|
Mp
(MJup)
|
<0.0088 | --- | --- | --- |
|
e
|
0 | --- | --- | --- |
|
i
(deg)
|
78.1+4.7-4.1
|
89.7±10.0 | --- |
81.504912 +6.105585-14.064589
|
|
P
(days)
|
0.505608+0.000073-0.000057
|
0.505570±0.000088 |
0.50565+0.00006-0.00005
|
0.505570 +0.000037-0.000036
|
|
ρ
(g/cm3)
|
<31 | --- | --- | --- |
|
Rp
(R⨁)
|
0.79±0.10 |
0.89+0.10-0.09
|
0.89+0.10-0.08
|
0.909737660824 +0.0988718180021-0.0740419448047
|
|
Rp
(RJup)
|
0.070±0.009 |
0.079+0.009-0.008
|
0.079+0.009-0.007
|
0.0811613579 +0.0088207528-0.0066055799
|
|
Rp/R✶
|
0.00687+0.00059-0.00053
|
0.00801+0.00080-0.00053
|
0.0083+0.0009-0.0007
|
0.008231 +0.000773-0.000608
|
|
K
(m/s)
|
<2.1 | --- | --- | --- |
|
a
(au)
|
0.0135±0.0016 | --- | 0.0127±0.0001 | --- |
|
T14
(hours)
|
1.205+0.110-0.130
|
--- | 0.9 | --- |
|
TC
(days)
|
2457637.6646+0.0028-0.0030
(JD)
|
2457637.66396+0.00230-0.00200
(HJD)
|
2457583.5640+0.0042-0.0049
(BJD)
|
2457583.062 +0.003082-0.003107
|
|
δ
(%)
|
--- | --- | 0.01 | --- |
- Status
- Confirmed Planet
- Detected By
- Radial Velocity, Transit
| Source | Jankowski et al. 2026 | Adams et al. 2021 | Livingston et al. 2018 | Mayo et al. 2018 |
|---|---|---|---|---|
|
a/R✶
|
12.10+0.68-1.00
|
13+1-3
|
11.0+1.2-2.6
|
10.836669 +1.388499-3.610529
|
|
Teq
(K)
|
1191+50-34
|
--- | 1091±11 | --- |
|
b
|
0.38+0.17-0.22
|
--- |
0.42+0.30-0.29
|
--- |
|
ω
(deg)
|
90 | --- | --- | --- |
|
Mp
(M⨁)
|
4.2±1.3 | --- | --- | --- |
|
Mp
(MJup)
|
0.013±0.004 | --- | --- | --- |
|
e
|
0 | --- | --- | --- |
|
i
(deg)
|
88.2+1.1-1.0
|
89.6+4.0-3.0
|
--- |
87.453844 +1.818275-3.940541
|
|
P
(days)
|
4.56395+0.00034-0.00033
|
4.562546±0.000140 |
4.56327+0.00051-0.00049
|
4.564169 +0.000282-0.000299
|
|
ρ
(g/cm3)
|
8.3±3.7 | --- | --- | --- |
|
Rp
(R⨁)
|
1.41±0.15 | 1.5±0.1 |
1.57+0.11-0.07
|
1.61959210133 +0.14096592954-0.0881449417251
|
|
Rp
(RJup)
|
0.126±0.013 | 0.13±0.01 |
0.140+0.010-0.006
|
0.1444903293 +0.0125761379-0.0078637650
|
|
Rp/R✶
|
0.01233+0.00059-0.00054
|
0.01290+0.00120-0.00042
|
0.0146+0.0010-0.0006
|
0.014654 +0.000992-0.000621
|
|
K
(m/s)
|
1.54±0.49 | --- | --- | --- |
|
a
(au)
|
0.0584+0.0070-0.0071
|
--- | 0.0549±0.0003 | --- |
|
T14
(hours)
|
2.714+0.110-0.150
|
--- | 2.8 | --- |
|
TC
(days)
|
2457628.6173+0.0025-0.0033
(JD)
|
2457628.61208+0.00290-0.00250
(HJD)
|
2457582.9755+0.0044-0.0045
(BJD)
|
2457582.97339 +0.002828-0.002745
|
|
δ
(%)
|
--- | --- | 0.02 | --- |
- Status
- Candidate Planet
- Detected By
- Radial Velocity
- Tools
| Source | Jankowski et al. 2026 |
|---|---|
|
a/R✶
|
611+49-55
|
|
Teq
(K)
|
168+8-7
|
|
ω
(deg)
|
-127±12 |
|
Mp sin i
(M⨁)
|
410+73-54
|
|
Mp sin i
(MJup)
|
1.29+0.23-0.17
|
|
e
|
0.355+0.057-0.056
|
|
P
(days)
|
1653+118-124
|
|
K
(m/s)
|
22.7+3.0-2.2
|
|
a
(au)
|
2.96+0.39-0.38
|
|
TC
(days)
|
2460787+52-50
(JD)
|
Nearby Data (within 30 arcseconds) Browse Nearby Data
+
- Known Objects
- 2 Confirmed Planets
- 1 K2 Targets
- 1 2MASS Point Source Catalog
- Data Files
- 1 K2 Time Series
- 2 Associated Literature Data
-
Mass constraints for the K2-223 system planets: An ultra-short-period sub-Earth, a short-period super-Earth, and a tentative long-period giant planet
Jankowski et al. 2026 Reference Overview -
Ultra-short-period Planets in K2. III. Neighbors are Common with 13 New Multiplanet Systems and 10 Newly Validated Planets in Campaigns 0-8 and 10
Adams et al. 2021 Reference Overview -
The Revised TESS Input Catalog and Candidate Target List
TICv8 Reference Overview -
Gaia Data Release 2
Gaia DR2 Reference Overview -
44 Validated Planets from K2 Campaign 10
Livingston et al. 2018 Reference Overview -
275 Candidates and 149 Validated Planets Orbiting Bright Stars in K2 Campaigns 0-10
Mayo et al. 2018 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
- System
- Star
- Confirmed
- Candidate
- False Positive Planet
- Controversial
- False Positive
- Aliases
- Data Access
- Transit Prediction Service
- Time Series
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