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K2-8 Overview

  • Star: K2-8
    • Stellar Radius: 0.80 Solar Radius
    • Stellar Effective Temperature: 5147.00 K
    • Planet: K2-8 c
      • Disposition Confirmed
      • Planet Radius 0.215 Jupiter Radius
    • Planet: K2-8 b
      • Disposition Confirmed
      • Planet Radius 0.319 Jupiter Radius

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
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
mV 14.801±0.320
mTESS 13.7067±0.0068
mJ 12.829±0.026
mH 12.318±0.030
mKs 12.245±0.030
mKep 14.384
mW1 12.159±0.022
mW2 12.215±0.024
mW3 11.78
mW4 8.796
mGaia 14.335800±0.000396
mB 15.726±0.021
mg 15.1129000±0.0036593
mi 14.303300±0.001061
mr 14.2809000±0.0040471
mu 17.3307000±0.0101663
mz 13.8451000±0.0045932
Abundances
(Hypatia Catalog)
[Fe/H] 0.01±0.03 dex
[C/H] -0.05±0.09 dex
[O/H] -0.17±0.09 dex
[Na/H] -0.12±0.04 dex
[Mg/H] 0.09±0.06 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
Teff
(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 --- --- --- --- --- --- --- ---
Print
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
a/R✶
13.50+6.87-4.82
 ---
21.1 +5.8-2.8
--- 15.49±0.49
Teq
(K)
801±23 --- --- --- 877.0±17.0
b
0.78+0.12-0.42
 --- --- 0.58 ---
S
(S⨁)
97.80±11.40 135±31 --- --- ---
i
(deg)
86.70±2.48 --- --- --- ---
P
(days)
5.06416±0.00041 5.06408±0.00093
5.06347 +0.00026-0.00023
5.0639064 5.06468±0.00063
Rp
(R⨁)
2.41±0.33 2.44±0.35
2.32 +0.26-0.30
2.46 2.31±0.33
Rp
(RJup)
0.215±0.029 0.218±0.031
0.207 +0.023-0.03
 0.219 0.206±0.029
Rp/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 ---
TC
(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)
δ
(%)
--- ---
0.0993 +0.005-0.0052
0.0953 ---
Print
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
--- ---
Teq
(K)
631±18 --- 691±14 --- --- ---
b
0.880+0.040-0.360
 --- --- --- --- 0.58
S
(S⨁)
37.7±4.4 52±12 --- --- --- ---
i
(deg)
86.42+2.56-1.37
 --- --- --- --- ---
P
(days)
10.35239±0.00086 10.3535±0.0015 10.35176±0.00133
10.35160 +0.00079-0.00074
10.35848367 10.353263
Rp
(R⨁)
3.58±0.71 3.32±0.50 2.97±0.51
2.86 +0.37-0.66
--- 3.09
Rp
(RJup)
0.319±0.063 0.296±0.045 0.265±0.045
0.255 +0.033-0.059
 --- 0.276
Rp/R✶
0.04457±0.00861 0.0377±0.0048 ---
0.0368 +0.0035-0.0083
--- 0.03636
a
(au)
0.0856±0.0014 0.0877±0.0021 0.0856±0.0012 --- --- ---
T14
(hours)
3.362±0.885 2.43±0.29 ---
2.44800+0.16800-0.28800
3.26300+0.24300-0.24300
 2.41000
TC
(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)
δ
(%)
--- --- 0.078
0.147 +0.0081-0.0084
0.149±0.014 0.150
Print
Known Objects
2 Confirmed Planets
1 K2 Targets
1 2MASS Point Source Catalog
Data Files
1 K2 Time Series
2 Associated Literature Data
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  • Candidate
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