Kepler-816 Overview
Kepler-816
0.75
R⦿
4936.00
K
Kepler-816 b
0.914
RJup
- Architecture
- Kepler-816
- Kepler-816
- Other Data
- Bibliography 16
- Exoplanet Archive Notes 1
- Nearby Data 6
Discovery Data
Host | Planet | Method | Year | Reference | Disposition |
---|---|---|---|---|---|
Kepler-816 | Kepler-816 b | Transit | 2016 | Morton et al. 2016 | Confirmed Planet |
Kepler-816 b
- Orbital period, transit mid-point, transit duration, Rp/Rs and their errors taken from DR24 KOI table. Planet radius error propagated from stellar radius error in ref. and Rp/Rs error. (Morton et al. 2016)
- RA
- 19h33m27.08s
- Dec
- +39d12m44.78s
- Distance
- 983.6970±36.3360 pc
- Parallax
- 0.9895070±0.0372020 mas
- Ecliptic Latitude
- 59.65077 deg
- Ecliptic Longitude
- 307.45187 deg
- Galactic Latitude
- 9.356 deg
- Galactic Longitude
- 72.38946 deg
- Total Proper Motion
- 0.8592343±0.0653394 mas/yr
- Proper Motion (RA)
- -0.457265±0.067539 mas/yr
- Proper Motion (Dec)
- 0.7274560±0.0644496 mas/yr
- Photometry
-
mV16.365±0.126
-
mTESS15.3058±0.0080
-
mJ14.426±0.031
-
mH14.045±0.032
-
mKs13.892±0.057
-
mKep15.950
-
mW113.799±0.025
-
mW213.909±0.033
-
mW312.566
-
mW49.39
-
mGaia15.935700±0.000629
-
mB16.871±0.070
-
mg---
-
mi---
-
mr---
-
mz---
Source | TICv8 | Berger et al. 2018 | Gaia DR2 | Morton et al. 2016 | Batalha et al. 2013 | Latham et al. 2005 | Q1-Q17 DR25 Supplemental KOI Table | Q1-Q17 DR25 KOI Table | Q1-Q17 DR24 KOI Table | Q1-Q16 KOI Table | Q1-Q12 KOI Table | Q1-Q8 KOI Table | Q1-Q6 KOI Table | Show Candidate Solutions >> | << Hide Candidate Solutions |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Teff
(K)
|
4797.24±224.42 | 5124±179 |
4966.71+153.98-127.91
|
5286.000+54.611-88.405
|
4936 | 4936 | --- | 5127±185 |
5122 +209-160
|
5122 +209-160
|
5122.00 +209.00-160.00
|
4936.00±200.00 | 4936 | ||
Metallicity
(dex)
|
0.186±0.214 [M/H] | --- | --- |
0.160+0.160-0.185
[Fe/H]
|
--- | 0.114 [Fe/H] | --- |
0.12 +0.25-0.3
[Fe/H]
|
0.100±0.260 [Fe/H] | 0.100±0.260 [Fe/H] | 0.100±0.260 [Fe/H] | --- | --- | ||
R✶
(R⦿)
|
0.940687 |
0.809+0.071-0.064
|
0.80724066+0.04324170-0.04781780
|
0.850+0.056-0.045
|
0.74 | 0.749 | --- |
0.782 +0.104-0.061
|
0.784 +0.157-0.054
|
0.784 +0.157-0.054
|
0.7840 +0.1570-0.0540
|
0.7500±0.3000 | .74 | ||
log g
(log10(cm/s2))
|
4.38327 | --- | --- |
4.540+0.036-0.064
|
4.62 | 4.63 | --- |
4.589 +0.03-0.09
|
4.583 +0.025-0.129
|
4.583 +0.025-0.129
|
4.583 +0.025-0.129
|
4.630±0.300 | 4.62 | ||
M✶
(M⦿)
|
0.78 | --- | --- |
0.900+0.040-0.044
|
0.84 | --- | --- |
0.872 +0.057-0.092
|
0.859 +0.075-0.08
|
0.859 +0.075-0.08
|
0.8590 +0.0750-0.0800
|
0.8700±0.3000 | --- | ||
L✶
(log10(L⦿))
|
-0.3744494 | --- |
-0.44702403+0.03621622-0.03951336
|
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ||
Age
(Gyr)
|
--- | --- | --- |
4.17+5.51-2.54
|
--- | --- | --- | --- | --- | --- | --- | --- | --- | ||
ρ✶
(g/cm3)
|
1.3210679 | --- | --- | --- | --- | --- | --- |
1.78859 +0.47803-0.06018
|
2.31041 +0.00570-0.25450
|
2.31041 +0.00570-0.25450
|
2.31041 +0.00570-0.25450
|
--- | --- |
- Status
- Confirmed Planet
- Detected By
- Transit
Source | Morton et al. 2016 | GajdoĊĦ et al. 2019 | Berger et al. 2018 | Holczer et al. 2016 | Q1-Q17 DR25 Supplemental KOI Table | Q1-Q17 DR25 KOI Table | Q1-Q17 DR24 KOI Table | Q1-Q16 KOI Table | Q1-Q12 KOI Table | Q1-Q8 KOI Table | Show Candidate Solutions >> | << Hide Candidate Solutions |
---|---|---|---|---|---|---|---|---|---|---|---|---|
a/R✶
|
--- | --- | --- | --- | --- | 21.85±5.8 | 23.8008±0.0587 | 23.8008±0.0587 | 23.8008±0.0587 | 23.6±6.1 | ||
Teq
(K)
|
--- | --- | --- | --- | --- | 668 | 669 | 669 | 669 | 628 | ||
b
|
--- | --- | --- | --- | --- |
0.407 +0.074-0.178
|
0.0307 +0.2227-0.0306
|
0.0307 +0.2227-0.0306
|
0.0307 +0.2227-0.0306
|
0.03±0.22 | ||
S
(S⨁)
|
--- | --- |
50.563+4.810-4.342
|
--- | --- |
47.21 +22.62-12.56
|
47.48 +32.78-11.22
|
47.48 +32.78-11.22
|
47.48 +32.78-11.22
|
--- | ||
e
|
--- | --- | --- | --- | --- | 0 | 0 | 0 | 0 | 0 | ||
i
(deg)
|
--- | --- | --- | --- | --- | 88.93 | 89.95 | 89.95 | 89.95 | 89.95 | ||
P
(days)
|
10.506825646±3.817e-06 | 10.5068282763±0.0000028127 | --- | 10.50682570±0.00000043 | 10.50682978±3.682e-06 | 10.50682978±3.682e-06 | 10.506825646±3.817e-06 | 10.506825646±3.817e-06 | 10.506825646±3.817e-06 | 10.506822±1.5e-05 | ||
Rp
(R⨁)
|
10.24+0.68-0.54
|
--- |
9.3210+0.8650-0.7530
|
--- | --- |
9.01 +1.2-0.7
|
9.41 +1.89-0.64
|
9.41 +1.89-0.64
|
9.41 +1.89-0.64
|
8.2±3.3 | ||
Rp/R✶
|
0.109971 +0.001048-0.00033
|
--- | --- | --- | --- |
0.105491 +0.003215-0.001652
|
0.109971 +0.001048-0.00033
|
0.109971 +0.001048-0.00033
|
0.109971 +0.001048-0.00033
|
0.1004±0.0028 | ||
a
(au)
|
--- | --- | --- | --- | --- | .0895 | .0893 | .0893 | .0893 | .09 | ||
δ
(%)
|
--- | --- | --- | 1.5284 | --- | 1.33555±0.00452 | 1.52672±0.00515 | 1.52672±0.00515 | 1.52672±0.00515 | 1.28350 | ||
T14
(hours)
|
3.7432±0.0181 | --- | --- | 3.8199 | --- | 3.7769±0.0353 | 3.7432±0.0181 | 3.7432±0.0181 | 3.7432±0.0181 | 3.7353 | ||
TC
(days)
|
2455193.082546±0.000262 | 2455193.08229000±0.00019647 | --- | 2455193.083059±0.000419 | 2455193.082±0.00025 | 2455193.082±0.00025 | 2455193.083±0.000262 | 2455193.083±0.000262 | 2455193.083±0.000262 | 2455193.08165±0.00037 | ||
Rp
(RJup)
|
0.9136+0.0607-0.0482
|
--- |
0.83156+0.07717-0.06718
|
--- | --- | --- | --- | --- | --- | --- |
Kepler Detection Products
(4 File Types, 15 Files)
Kepler Pipeline Data Validation Reports | q1_q12_tce | q1_q16_tce | q1_q17_dr24_tce | q1_q17_dr25_tce |
---|---|---|---|---|
Kepler Pipeline Data Validation Summaries | q1_q12_tce | q1_q16_tce | q1_q17_dr24_tce | q1_q17_dr25_tce |
Kepler TCERT Reports | q1_q16_tce | q1_q17_dr24_tce | q1_q17_dr25_tce | |
Kepler Planet Detection Metrics | q1_q17_dr24_stellar | q1_q17_dr24_stellar | q1_q17_dr25_stellar | q1_q17_dr25_stellar |
Kepler Detection Products
Kepler Pipeline Data Validation Summaries | q1_q12_tce | q1_q16_tce | q1_q17_dr24_tce | q1_q17_dr25_tce |
---|
Kepler Object of Interest
KepID | 4164994 | 4164994 | 4164994 | 4164994 | 4164994 | 4164994 | 4164994 |
---|---|---|---|---|---|---|---|
KOI Name | K01320.01 | K01320.01 | K01320.01 | K01320.01 | K01320.01 | K01320.01 | K01320.01 |
Kepler Name | Kepler-816 b | Kepler-816 b | Kepler-816 b | Kepler-816 b | Kepler-816 b | Kepler-816 b | Kepler-816 b |
Exoplanet Archive Disposition | CONFIRMED | CONFIRMED | CONFIRMED | CONFIRMED | CONFIRMED | CONFIRMED | CONFIRMED |
Vetting Status | Done | Done | Done | Done | Done | Done | Done |
Date of Last Parameter Update | 2018-08-16 | 2017-08-31 | 2015-09-24 | 2014-12-18 | 2014-12-04 | 2014-01-07 | 2013-02-12 |
Disposition Using Kepler Data | CANDIDATE | CANDIDATE | CANDIDATE | NOT DISPOSITIONED | NOT DISPOSITIONED | NOT DISPOSITIONED | CANDIDATE |
Not Transit-Like False Positive Flag | 0 | 0 | 0 | 0 | 0 | --- | --- |
Stellar Eclipse False Positive Flag | 0 | 0 | 0 | 0 | 0 | --- | --- |
Centroid Offset False Positive Flag | 0 | 0 | 0 | 0 | 0 | --- | --- |
Ephemeris Match Indicates Contamination False Positive Flag | 0 | 0 | 0 | 0 | 0 | --- | --- |
Disposition Provenance | q1_q17_dr25_sup_koi | q1_q17_dr25_koi | q1_q17_dr24_koi | q1_q16_koi | q1_q12_koi | q1_q8_koi | q1_q6_kepler_candidates |
Orbital Period [days] | 10.50682978±3.682e-06 | 10.50682978±3.682e-06 | 10.506825646±3.817e-06 | 10.506825646±3.817e-06 | 10.506825646±3.817e-06 | 10.506822±1.5e-05 | 10.506821±1.5e-05 |
Transit Epoch [BKJD] | 360.082152±0.00025 | 360.082152±0.00025 | 360.082546±0.000262 | 360.082546±0.000262 | 360.082546±0.000262 | 360.08165±0.00037 | 360.08165±0.00037 |
Transit Epoch [BJD] | 2455193.082±0.00025 | 2455193.082±0.00025 | 2455193.083±0.000262 | 2455193.083±0.000262 | 2455193.083±0.000262 | 2455193.08165±0.00037 | 2455193.08165±0.00037 |
Parameters Provenance | q1_q17_dr25_sup_koi | q1_q17_dr25_koi | q1_q17_dr24_koi | q1_q16_koi | q1_q12_koi | q1_q8_koi | q1_q6_kepler_candidates |
Number of Planets | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
TCE Delivery | q1_q17_dr25_tce | q1_q17_dr25_tce | q1_q17_dr24_tce | q1_q16_tce | q1_q12_tce | --- | --- |
Link to DV Report | kplr004164994-20160209194854_dvr.pdf | kplr004164994-20160209194854_dvr.pdf | kplr004164994-20141002224145_dvr.pdf | kplr004164994-20130815195353_dvr.pdf | kplr004164994-20121029204534_dvr.pdf | --- | --- |
RA [decimal degrees] | 293.36285 | 293.36285 | 293.36285 | 293.36285 | 293.36285 | 293.36285 | 293.36285 |
Dec [decimal degrees] | 39.212447999999995 | 39.212447999999995 | 39.212447999999995 | 39.212447999999995 | 39.212447999999995 | 39.212447999999995 | 39.212447999999995 |
Kepler-band [mag] | 15.950000000000001 | 15.950000000000001 | 15.950000000000001 | 15.950000000000001 | 15.950000000000001 | 15.950000000000001 | 15.950000000000001 |
g'-band [mag] | 16.737000000000002 | 16.737000000000002 | 16.737000000000002 | 16.737000000000002 | 16.737000000000002 | 16.737000000000002 | 16.737000000000002 |
r'-band [mag] | 15.892000000000001 | 15.892000000000001 | 15.892000000000001 | 15.892000000000001 | 15.892000000000001 | 15.892000000000001 | 15.892000000000001 |
i'-band [mag] | 15.612 | 15.612 | 15.612 | 15.612 | 15.612 | 15.612 | 15.612 |
z'-band [mag] | 15.452 | 15.452 | 15.452 | 15.452 | 15.452 | 15.452 | 15.452 |
J-band [mag] | 14.426 | 14.426 | 14.426 | 14.426 | 14.426 | 14.426 | 14.426 |
H-band [mag] | 14.045 | 14.045 | 14.045 | 14.045 | 14.045 | 14.045 | 14.045 |
K-band [mag] | 13.892000000000001 | 13.892000000000001 | 13.892000000000001 | 13.892000000000001 | 13.892000000000001 | 13.892000000000001 | 13.892000000000001 |
Disposition Score | --- | 1.0 | --- | --- | --- | --- | --- |
Comment | --- | NO_COMMENT | EYEBALL---SIGNIF_OFFSET | --- | --- | --- | --- |
Eccentricity | --- | 0 | 0 | 0 | 0 | 0 | 0 |
Impact Parameter | --- |
0.407 +0.074-0.178
|
0.0307 +0.2227-0.0306
|
0.0307 +0.2227-0.0306
|
0.0307 +0.2227-0.0306
|
0.03±0.22 | 0.03±0.46 |
Transit Duration [hrs] | --- | 3.7769±0.0353 | 3.7432±0.0181 | 3.7432±0.0181 | 3.7432±0.0181 | 3.7353 | 3.7353 |
Transit Depth [ppm] | --- | 13355.5±45.2 | 15267.2±51.5 | 15267.2±51.5 | 15267.2±51.5 | 12835 | 12803 |
Planet-Star Radius Ratio | --- |
0.105491 +0.003215-0.001652
|
0.109971 +0.001048-0.00033
|
0.109971 +0.001048-0.00033
|
0.109971 +0.001048-0.00033
|
0.1004±0.0028 | 0.1004±0.0028 |
Fitted Stellar Density [g/cm**3] | --- |
1.78859 +0.47803-0.06018
|
2.31041 +0.00570-0.25450
|
2.31041 +0.00570-0.25450
|
2.31041 +0.00570-0.25450
|
--- | --- |
Planetary Fit Type | --- | LS+MCMC | MCMC | MCMC | MCMC | --- | --- |
Planetary Radius [Earth radii] | --- |
9.01 +1.2-0.7
|
9.41 +1.89-0.64
|
9.41 +1.89-0.64
|
9.41 +1.89-0.64
|
8.2±3.3 | 8.09 |
Orbit Semi-Major Axis [au] | --- | .0895 | .0893 | .0893 | .0893 | .09 | .088 |
Inclination [deg] | --- | 88.93 | 89.95 | 89.95 | 89.95 | 89.95 | --- |
Equilibrium Temperature [K] | --- | 668 | 669 | 669 | 669 | 628 | 631 |
Insolation Flux [Earth flux] | --- |
47.21 +22.62-12.56
|
47.48 +32.78-11.22
|
47.48 +32.78-11.22
|
47.48 +32.78-11.22
|
--- | --- |
Planet-Star Distance over Star Radius | --- | 21.85±5.8 | 23.8008±0.0587 | 23.8008±0.0587 | 23.8008±0.0587 | 23.6±6.1 | 23.6±6.1 |
Limb Darkening Model | --- | Claret (2011 A&A 529 75) ATLAS LS | Claret (2011 A&A 529 75) ATLAS LS | Claret (2011 A&A 529 75) ATLAS LS | Claret (2011 A&A 529 75) ATLAS LS | Claret (2011 A&A 529 75) ATLAS LS | Claret (2011 A&A 529 75) ATLAS LS |
Limb Darkening Coeff. 4 | --- | 0.0 | 0.0 | 0.0 | 0.0 | -0.547 | --- |
Limb Darkening Coeff. 3 | --- | 0.0 | 0.0 | 0.0 | 0.0 | 1.3017 | --- |
Limb Darkening Coeff. 2 | --- | 0.19140000000000001 | 0.16920000000000002 | 0.16920000000000002 | 0.16920000000000002 | -0.5929 | --- |
Limb Darkening Coeff. 1 | --- | 0.5167 | 0.5477000000000001 | 0.5477000000000001 | 0.5477000000000001 | 0.6546000000000001 | --- |
Maximum Single Event Statistic | --- | 60.110189999999996 | 58.217976 | --- | --- | --- | --- |
Maximum Multiple Event Statistic | --- | 336.95108 | 340.54605 | --- | --- | --- | --- |
Transit Signal-to-Noise | --- | 343.40000000000003 | 369.2 | 369.2 | 369.2 | 405.40000000000003 | 283.8 |
Number of Transits | --- | 83 | 83 | --- | --- | --- | --- |
TCE Planet Number | --- | 1 | 1 | 1 | 1 | --- | --- |
Quarters | --- | 00011011101110111000000000000000 | 11011101110111000000000000000 | --- | --- | --- | --- |
Odd-Even Depth Comparision Statistic | --- | 0.6928000000000001 | --- | --- | --- | --- | --- |
Transit Model | --- | Mandel and Agol (2002 ApJ 580 171) | Mandel and Agol (2002 ApJ 580 171) | Mandel and Agol (2002 ApJ 580 171) | Mandel and Agol (2002 ApJ 580 171) | Mandel and Agol (2002 ApJ 580 171) | Mandel and Agol (2002 ApJ 580 171) |
Link to DV Summary | --- | kplr004164994-001-20160209194854_dvs.pdf | kplr004164994-001-20141002224145_dvs.pdf | kplr004164994-001-20130826182306_dvs.pdf | kplr004164994-001-20121115231752_dvs.pdf | --- | --- |
Stellar Effective Temperature [K] | --- | 5127±185 |
5122 +209-160
|
5122 +209-160
|
5122.00 +209.00-160.00
|
4936.00±200.00 | 4936 |
Stellar Surface Gravity [log10(cm/s**2)] | --- |
4.589 +0.03-0.09
|
4.583 +0.025-0.129
|
4.583 +0.025-0.129
|
4.583 +0.025-0.129
|
4.630±0.300 | 4.62 |
Stellar Metallicity [dex] | --- |
0.12 +0.25-0.3
|
0.100±0.260 | 0.100±0.260 | 0.100±0.260 | --- | --- |
Stellar Radius [Solar radii] | --- |
0.782 +0.104-0.061
|
0.784 +0.157-0.054
|
0.784 +0.157-0.054
|
0.7840 +0.1570-0.0540
|
0.7500±0.3000 | .74 |
Stellar Mass [Solar mass] | --- |
0.872 +0.057-0.092
|
0.859 +0.075-0.08
|
0.859 +0.075-0.08
|
0.8590 +0.0750-0.0800
|
0.8700±0.3000 | --- |
Stellar Parameter Provenance | --- | q1_q17_dr25_stellar | stellar_q1_q16 | stellar_q1_q16 | stellar_q1_q16 | KIC | KIC |
FW Offset Significance [percent] | --- | 0.0 | 0.0 | 0.0 | 0.0 | --- | --- |
FW Source α(OOT) [hrs] | --- | 19.55752104±0.00000079 | 19.55751986±0.00000078 | 19.55752±0.00000074 | 19.557519190±0.000000860 | --- | --- |
FW Source δ(OOT) [deg] | --- | 39.212615±0.00001 | 39.21261±0.00001 | 39.2126133±0.0000094 | 39.21260800±0.00001000 | --- | --- |
FW Source Δα(OOT) [sec] | --- | -0.07±0.033 | -0.119±0.033 | -0.113±0.031 | 0.00380±0.00310 | --- | --- |
FW Source Δδ(OOT) [arcsec] | --- | 0.594±0.036 | 0.576±0.037 | 0.588±0.034 | -0.05940±0.00250 | --- | --- |
FW Δα(OOT) [sec] | --- | -0.0014±0.0017 | -0.0011±0.0018 | -0.0013±0.0024 | -6e-05±0.00026 | --- | --- |
FW Δδ(OOT) [arcsec] | --- | 0.0123±0.0021 | 0.0123±0.0024 | 0.0136±0.003 | 0.00093±0.00026 | --- | --- |
PRF ΔαSQ(OOT) [arcsec] | --- | -0.026±0.071 | -0.025±0.071 | -0.011±0.071 | -0.0200±0.0250 | --- | --- |
PRF ΔδSQ(OOT) [arcsec] | --- | -0.283±0.071 | -0.283±0.071 | -0.277±0.072 | -0.2690±0.0270 | --- | --- |
PRF ΔθSQ(OOT) [arcsec] | --- | 0.285±0.071 | 0.284±0.071 | 0.277±0.072 | 0.2700±0.0270 | --- | --- |
PRF ΔαSQ(KIC) [arcsec] | --- | 0.03±0.11 | 0.03±0.11 | -0.046±0.098 | -0.0660±0.0370 | --- | --- |
PRF ΔδSQ(KIC) [arcsec] | --- | 0.143±0.089 | 0.141±0.089 | 0.147±0.083 | 0.1280±0.0720 | --- | --- |
PRF ΔθSQ(KIC) [arcsec] | --- | 0.145±0.099 | 0.14±0.12 | 0.15±0.1 | 0.1440±0.0660 | --- | --- |
Chi-Square | --- | --- | --- | --- | --- | 2.14 | 2.14 |
- Known Objects
- 1 Confirmed Planets
- 1 Kepler Objects of Interest (KOIs)
- 1 Threshold Crossing Events (TCEs)
- 7 2MASS Point Source Catalog
- Data Files
- 1 Kepler Time Series
- 1 Associated Literature Data
-
The Revised TESS Input Catalog and Candidate Target List
TICv8 | Reference Overview -
Transit timing variations and linear ephemerides of confirmed Kepler transiting exoplanets
Gajdoš et al. 2019 | Reference Overview -
Revised Radii of Kepler Stars and Planets Using Gaia Data Release 2
Berger et al. 2018 | Reference Overview -
Kepler KOI delivery, Q1-Q17 DR25 supplement
Q1-Q17 DR25 Supplemental KOI Table -
Gaia Data Release 2
Gaia DR2 | Reference Overview -
Kepler KOI delivery, Q1-Q17 DR25
Q1-Q17 DR25 KOI Table -
Transit Timing Observations from Kepler. IX. Catalog of the Full Long-cadence Data Set
Holczer et al. 2016 | Reference Overview -
False Positive Probabilities for all Kepler Objects of Interest: 1284 Newly Validated Planets and 428 Likely False Positives
Morton et al. 2016 | Reference Overview -
Kepler KOI delivery, Q1-Q17 DR24
Q1-Q17 DR24 KOI Table -
Kepler KOI delivery, Q1-Q16
Q1-Q16 KOI Table -
Kepler KOI delivery, Q1-Q12
Q1-Q12 KOI Table -
Kepler KOI delivery, Q1-Q8
Q1-Q8 KOI Table -
Kepler KOI delivery, Q1-Q6
Q1-Q6 KOI Table -
Planetary Candidates Observed by Kepler, III: Analysis of the First 16 Months of Data
Batalha et al. 2013 | Reference Overview -
The Kepler Input Catalog
Latham et al. 2005 | 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
- Kepler | K2
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