K2-8 Overview

K2-8 0.80 R_⦿ 5147.00 K

K2-8 c

0.215 R_Jup

K2-8 b

0.319 R_Jup

Overview Parameters Nearby Data Bibliography 11 Legend Expand All

K2-8 Architecture & Discovery Information

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
K2-8
K2-8 c	5.06 d	2.41 R_⨁	Transit	2016	Sinukoff et al. 2016	Confirmed Planet
K2-8 b	10.35 d	3.58 R_⨁	Transit	2015	Montet et al. 2015	Confirmed Planet

K2-8 Stellar Parameters (9 Solutions)

RA: 11h19m10.44s

Dec: -00d17m03.98s

Distance: 403.5130±11.6715 pc

Parallax: 2.4513700±0.0710901 mas

Ecliptic Latitude: -4.30342 deg

Ecliptic Longitude: 170.72819 deg

Galactic Latitude: 54.74227 deg

Galactic Longitude: 260.18944 deg

Total Proper Motion: 39.3839143±0.0756667 mas/yr

Proper Motion (RA): -36.0233000±0.0788831 mas/yr

Proper Motion (Dec): -15.9190000±0.0563912 mas/yr

Photometry: m_V
14.801±0.320; m_TESS
13.7067±0.0068; m_J
12.829±0.026; m_H
12.318±0.030; m_Ks
12.245±0.030; m_Kep
14.384; m_W1
12.159±0.022; m_W2
12.215±0.024; m_W3
11.78; m_W4
8.796; m_Gaia
14.335800±0.000396; m_B
15.726±0.021; m_g
15.1129000±0.0036593; m_i
14.303300±0.001061; m_r
14.2809000±0.0040471; m_u
17.3307000±0.0101663; m_z
13.8451000±0.0045932

Abundances (Hypatia Catalog): [Fe/H] -0.02±0.04 dex; [C/H] -0.05±0.09 dex; [O/H] -0.17±0.09 dex; [Na/H] -0.12±0.04 dex; [Mg/H] 0.03±0.07 dex; [Al/H] -0.08±0.06 dex; [Si/H] -0.10±0.05 dex; [Ca/H] 0.02±0.06 dex; [Y/H] -0.01±0.08 dex

Mission: K2 : Observed in Campaign 1

Tools: Planetary Systems; ExoFOP Target Overview Page; IRSA Finding Chart; K2 Names; K2 Planets and Candidates; K2 Targets; Stellar Hosts; K2 Time Series

Source	TICv8	Gaia DR2	Crossfield et al. 2016	Sinukoff et al. 2016	Montet et al. 2015	Kruse et al. 2019	Kruse et al. 2019	Barros et al. 2016	Vanderburg et al. 2016
T_eff (K)	4779.0±25.0	4849.1953+202.8050-123.8120	5147±213	4870±60	4890+38-58	---	---	---	4797
M_✶ (M_⦿)	0.77	---	0.840±0.060	0.78±0.04	0.79+0.03-0.04	---	---	---	---
R_✶ (R_⦿)	0.771581	0.7244564+0.0384612-0.0569968	0.800±0.060	0.74±0.04	0.74+0.02-0.03	0.712 +0.064-0.028	0.712 +0.064-0.028	---	0.73
log g (log₁₀(cm/s²))	4.5498	---	4.562±0.044	4.52±0.10	---	---	---	---	---
L_✶ (log₁₀(L_⦿))	-0.5531940	-0.58260200+0.02577410-0.02740076	---	---	---	---	---	---	---
Metallicity (dex)	0.010±0.100 [M/H]	---	---	-0.02±0.04 [Fe/H]	-0.010+0.110-0.130 [Fe/H]	---	---	---	---
v sin i (km/s)	---	---	---	<2	---	---	---	---	---
Sp. T	---	---	---	K3 V	---	---	---	---	---
ρ_✶ (g/cm³)	2.3632636	---	---	---	---	---	---	---	---

K2-8 c Planetary Parameters (5 Solutions)

Status: Confirmed Planet

Detected By: Transit

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

Source	Sinukoff et al. 2016	Crossfield et al. 2016	Kruse et al. 2019	Vanderburg et al. 2016	Montet et al. 2015
S (S_⨁)	97.80±11.40	135±31	---	---	---
P (days)	5.06416±0.00041	5.06408±0.00093	5.06347 +0.00026-0.00023	5.0639064	5.06468±0.00063
R_p (R_⨁)	2.41±0.33	2.44±0.35	2.32 +0.26-0.30	2.46	2.31±0.33
R_p (R_Jup)	0.215±0.029	0.218±0.031	0.207 +0.023-0.03	0.219	0.206±0.029
R_p/R_✶	0.02990±0.00385	0.0279±0.0034	0.0299 +0.0019-0.0036	0.02909	---
a (au)	0.0532±0.0009	0.0545±0.0013	---	---	---
T₁₄ (hours)	2.080+0.498-0.253	1.70±0.26	1.68240+0.08880-0.10800	1.81000	---
T_C (days)	2456813.0707±0.0033 (BJD-TDB)	2456813.0723±0.0070 (BJD-TDB)	2456813.0722 +0.0019-0.0021 (BJD)	2456813.071 (BJD)	2456813.0663±0.0071 (BJD)
b	0.78+0.12-0.42	---	---	0.58	---
δ (%)	---	---	0.0993 +0.005-0.0052	0.0953	---
a/R_✶	13.50+6.87-4.82	---	21.1 +5.8-2.8	---	15.49±0.49
T_eq (K)	801±23	---	---	---	877.0±17.0
i (deg)	86.70±2.48	---	---	---	---

K2-8 b Planetary Parameters (6 Solutions)

Status: Confirmed Planet

Detected By: Transit

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

Source	Sinukoff et al. 2016	Crossfield et al. 2016	Montet et al. 2015	Kruse et al. 2019	Barros et al. 2016	Vanderburg et al. 2016
a/R_✶	14.10+15.00-3.48	---	24.94±0.79	28.3 +12.1-5.6	---	---
T_eq (K)	631±18	---	691±14	---	---	---
P (days)	10.35239±0.00086	10.3535±0.0015	10.35176±0.00133	10.35160 +0.00079-0.00074	10.35848367	10.353263
R_p (R_⨁)	3.58±0.71	3.32±0.50	2.97±0.51	2.86 +0.37-0.66	---	3.09
R_p (R_Jup)	0.319±0.063	0.296±0.045	0.265±0.045	0.255 +0.033-0.059	---	0.276
a (au)	0.0856±0.0014	0.0877±0.0021	0.0856±0.0012	---	---	---
δ (%)	---	---	0.078	0.147 +0.0081-0.0084	0.149±0.014	0.150
T_C (days)	2456813.6114±0.0030 (BJD-TDB)	2456813.6087±0.0060 (BJD-TDB)	2456813.6119±0.0053 (BJD)	2456813.6125±0.0025 (BJD)	2456813.595802 (BJD)	2456813.610 (BJD)
S (S_⨁)	37.7±4.4	52±12	---	---	---	---
R_p/R_✶	0.04457±0.00861	0.0377±0.0048	---	0.0368 +0.0035-0.0083	---	0.03636
T₁₄ (hours)	3.362±0.885	2.43±0.29	---	2.44800+0.16800-0.28800	3.26300+0.24300-0.24300	2.41000
b	0.880+0.040-0.360	---	---	---	---	0.58
i (deg)	86.42+2.56-1.37	---	---	---	---	---

Nearby Data (within 30 arcseconds) Browse Nearby Data

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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)

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
Gaia Data Release 2
Gaia DR2 Reference Overview
New planetary and eclipsing binary candidates from campaigns 1-6 of the K2 mission
Barros et al. 2016 Reference Overview
197 Candidates and 104 Validated Planets in K2’s First Five Fields
Crossfield et al. 2016 Reference Overview
Eleven Multiplanet Systems from K2 Campaigns 1 and 2 and the Masses of Two Hot Super-Earths
Sinukoff 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
Planetary Candidates from the First Year of the K2 Mission
Vanderburg et al. 2016 Reference Overview
Stellar and Planetary Properties of K2 Campaign 1 Candidates and Validation of 17 Planets, Including a Planet Receiving Earth-like Insolation
Montet et al. 2015 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
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Candidate
False Positive Planet
Controversial
False Positive

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Kepler | K2

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