K2-21 Overview

K2-21 0.60 R_⦿ 4043.00 K

K2-21 b

0.164 R_Jup

K2-21 c

0.222 R_Jup

Overview Notes System Parameters Nearby Data Legend

Architecture: K2-21; K2-21

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

Exoplanet Archive Notes (2)

K2-21 b

Candidate identifier changed to match previous publication. (Kruse et al. 2019)

K2-21 c

Candidate identifier changed to match previous publication. (Kruse et al. 2019)

K2-21 Stellar Parameters (9 Solutions)

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: 336.36104 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: m_V
12.851±0.057; m_TESS
11.4644±0.0060; m_J
10.251±0.021; m_H
9.633±0.022; m_Ks
9.417±0.020; m_Kep
12.316; m_W1
9.407±0.023; m_W2
9.379±0.020; m_W3
9.399±0.042; m_W4
9.031±0.528; m_Gaia
12.278500±0.000342; m_B
14.138±0.054; m_g
---; m_i
---; m_r
---

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
T_eff (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	---	---	---	---	---	---	---	---

K2-21 b Planetary Parameters (5 Solutions)

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
R_p (R_⨁)	1.84±0.10	1.25±0.11	1.59+0.42-0.44	1.70 +0.14-0.22	1.89
R_p (R_Jup)	0.164±0.009	0.112±0.010	0.142+0.037-0.039	0.15 +0.012-0.020	0.169
R_p/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	---	---
T_C (days)	2456989.422±0.001	2456989.4247±0.0023	2456989.4239+0.0025-0.0020	2456980.1007 +0.0017-0.0016	2456980.096
T_eq (K)	---	---	500	---	---
b	---	---	0.700+0.150-0.450	---	0.54
ρ (g/cm³)	---	---	2.7+3.7-1.6	---	---
T₁₄ (hours)	---	2.372±0.080	2.305+0.118-0.064	2.52480+0.07920-0.09120	2.51000
δ (%)	---	---	---	0.0809±0.0021	0.0821

K2-21 c Planetary Parameters (6 Solutions)

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	---	---
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	---	---	---
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
R_p (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
R_p (R_Jup)	0.222+0.015-0.017	0.136±0.012	0.171+0.048-0.046	0.194 +0.016-0.023	---	0.204
R_p/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
a (au)	0.107+0.003-0.004	0.09800±0.00260	0.1026+0.0079-0.0094	---	---	---
T_C (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
T_eq (K)	---	---	420	---	---	---
b	---	---	0.660+0.190-0.400	---	---	0.00
ρ (g/cm³)	---	---	5.40+5.40-3.50	---	---	---
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
δ (%)	---	---	---	0.1294 +0.0033-0.0035	0.121±0.009	0.120

Nearby Data (5 Data Types within 30 arcseconds)

Known Objects: 2 Confirmed Planets; 1 K2 Targets; 1 2MASS Point Source Catalog

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

Bibliography (11 References)

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