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K2-21 Overview

K2-21 0.60 R⦿ 4043.00 K
K2-21 b
0.164 RJup
K2-21 c
0.222 RJup
Architecture
K2-21
K2-21
K2-21 b
K2-21 c
Other Data
Bibliography 11
Exoplanet Archive Notes 2
Nearby Data 5
Discovery Data
Host Planet Method Year Reference Disposition
K2-21 K2-21 b Transit 2015 Petigura et al. 2015 Confirmed Planet
K2-21 K2-21 c Transit 2015 Petigura et al. 2015 Confirmed Planet
K2-21 b K2-21 c
RA
22h41m12.91s
Dec
-14d29m21.57s
Distance
83.6448+0.2665-0.2649
pc
Parallax
11.9265000±0.0376904 mas
Ecliptic Latitude
-5.72499 deg
Ecliptic Longitude
336.36491 deg
Galactic Latitude
-57.17935 deg
Galactic Longitude
48.93602 deg
Total Proper Motion
81.5844334±0.0648486 mas/yr
Proper Motion (RA)
20.7358000±0.0730797 mas/yr
Proper Motion (Dec)
-78.9053000±0.0642412 mas/yr
Photometry
mV
12.851±0.057
mTESS
11.4644±0.0060
mJ
10.251±0.021
mH
9.633±0.022
mKs
9.417±0.020
mKep
12.316
mW1
9.407±0.023
mW2
9.379±0.020
mW3
9.399±0.042
mW4
9.031±0.528
mGaia
12.278500±0.000342
mB
14.138±0.054
mg
---
mi
---
mr
---
Mission
K2 : Observed in Campaign 3
Tools
ExoFOP Target Overview Page
IRSA Finding Chart
K2 Names
K2 Planets and Candidates
K2 Targets
Stellar Hosts
K2 Time Series
Source TICv8 Gaia DR2 Dressing et al. 2017 Crossfield et al. 2016 Petigura et al. 2015 Kruse et al. 2019 Kruse et al. 2019 Barros et al. 2016 Vanderburg et al. 2016 Show Candidate Solutions >> << Hide Candidate Solutions
Teff
(K)
4047.000+132.861-133.442
4213.487+153.000-116.262
4222.061035+88.145287-84.407585
 4006±43 4043±375 --- --- --- 4024
Metallicity
(dex)
--- --- --- --- -0.11±0.13 [Fe/H] --- --- --- ---
Age
(Gyr)
--- --- --- --- >1 --- --- --- ---
M✶
(M⦿)
0.6300000+0.0787268-0.0760954
 --- 0.676023±0.067602 0.523±0.041 0.64±0.11 --- --- --- ---
R✶
(R⦿)
0.6545230+0.0606779-0.0752417
0.57618654+0.03316340-0.03967120
0.646783+0.028803-0.028216
 0.460±0.033 0.60±0.10
0.576 +0.040-0.033
0.576 +0.040-0.033
--- 0.60
Sp. T
--- --- --- --- M0.0 --- --- --- ---
log g
(log10(cm/s2))
4.605560+0.108375-0.123376
 --- --- 4.828±0.050 --- --- --- --- ---
L✶
(log10(L⦿))
-0.9849220+0.0301096-0.0385432
-1.025612+0.002043-0.002052
 --- --- --- --- --- --- ---
γ
(km/s)
--- 4.800261351165759±1.605775761986466 --- --- --- --- --- --- ---
ρ✶
(g/cm3)
3.1675977+1.1400504-1.1006627
 --- --- --- --- --- --- --- ---
Print
Status
Confirmed Planet
Detected By
Transit
Tools
Transit Prediction Service
K2 Names
K2 Planets and Candidates
Transit
Source Dressing et al. 2017 Crossfield et al. 2016 Petigura et al. 2015 Kruse et al. 2019 Vanderburg et al. 2016 Show Candidate Solutions >> << Hide Candidate Solutions
a/R✶
25.37±1.17 ---
23.0+5.9-8.1
25.8 +7.0-3.2
---
S
(S⨁)
10.0+2.1-1.7
 10.0±1.6
11.0+10.1-6.0
 --- ---
ω
(deg)
34.4800000+101.8841870-133.7390080
 --- --- --- ---
e
0.100000+0.148654-0.084698
 --- --- --- ---
i
(deg)
88.98+0.50-0.31
 ---
88.3+1.3-1.1
 --- ---
P
(days)
9.325038+0.000379-0.000403
 9.32389±0.00060
9.32414+0.00059-0.00063
9.32448 +0.00033-0.00034
9.3251498
Rp
(R⨁)
1.84±0.10 1.25±0.11
1.59+0.42-0.44
1.70 +0.14-0.22
1.89
Rp
(RJup)
0.164±0.009 0.112±0.010
0.142+0.037-0.039
0.15 +0.012-0.020
 0.169
Rp/R✶
0.026158+0.000899-0.000720
 0.0246±0.0014
0.0260+0.0012-0.0015
0.0270 +0.0013-0.0031
0.02673
a
(au)
0.076+0.002-0.003
 0.0699±0.0018
0.0731+0.0057-0.0067
 --- ---
TC
(days)
2456989.422±0.001 2456989.4247±0.0023
2456989.4239+0.0025-0.0020
2456980.1007 +0.0017-0.0016
2456980.096
δ
(%)
--- --- --- 0.0809±0.0021 0.0821
T14
(hours)
--- 2.372±0.080
2.305+0.118-0.064
2.52480+0.07920-0.09120
 2.51000
Teq
(K)
--- --- 500 --- ---
b
--- ---
0.700+0.150-0.450
 --- 0.54
ρ
(g/cm3)
--- ---
2.7+3.7-1.6
 --- ---
Print
Status
Confirmed Planet
Detected By
Transit
Tools
Transit Prediction Service
K2 Names
K2 Planets and Candidates
Transit
Source Dressing et al. 2017 Crossfield et al. 2016 Petigura et al. 2015 Kruse et al. 2019 Barros et al. 2016 Vanderburg et al. 2016 Show Candidate Solutions >> << Hide Candidate Solutions
a/R✶
35.50±1.63 ---
41.0+8.4-16.8
45.6 +12.7-6.0
--- ---
P
(days)
15.501920+0.000918-0.000928
 15.50116±0.00090
15.50120+0.00093-0.00099
 15.50195±0.00056 15.49412230 15.504102
Rp
(R⨁)
2.49+0.17-0.19
 1.53±0.14
1.92+0.54-0.52
2.17 +0.18-0.26
--- 2.29
Rp
(RJup)
0.222+0.015-0.017
 0.136±0.012
0.171+0.048-0.046
0.194 +0.016-0.023
 --- 0.204
Rp/R✶
0.035332+0.001742-0.002190
 0.0302±0.0018
0.0315+0.0022-0.0017
0.0345 +0.0016-0.0036
--- 0.03099
δ
(%)
--- --- ---
0.1294 +0.0033-0.0035
0.121±0.009 0.120
T14
(hours)
--- 2.333±0.084
2.296+0.137-0.058
2.37840+0.07200-0.10080
2.21000+0.34000-0.34000
 2.27000
TC
(days)
2456988.471±0.002 2456988.4715±0.0018
2456988.4708+0.0021-0.0017
2456988.4703 +0.0011-0.0010
2456988.483101 2456988.466
S
(S⨁)
5.1+1.1-0.9
 5.09±0.81
5.60+5.10-3.10
 --- --- ---
ω
(deg)
59.9600000+75.6751870-120.5778310
 --- --- --- --- ---
e
0.210000+0.206770-0.173719
 --- --- --- --- ---
i
(deg)
88.85+0.40-0.15
 ---
89.08+0.63-0.75
 --- --- ---
a
(au)
0.107+0.003-0.004
 0.09800±0.00260
0.1026+0.0079-0.0094
 --- --- ---
Teq
(K)
--- --- 420 --- --- ---
b
--- ---
0.660+0.190-0.400
 --- --- 0.00
ρ
(g/cm3)
--- ---
5.40+5.40-3.50
 --- --- ---
Print
Known Objects
2 Confirmed Planets
1 K2 Targets
1 2MASS Point Source Catalog
Data Files
1 K2 Time Series
2 Associated Literature Data
System
Star
Confirmed
Candidate
False Positive Planet
Controversial
False Positive
Aliases
Data Access
Transit Prediction Service
Time Series
Kepler | K2
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