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KELT-4 A b

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Total Reductions to Date: 11

Date Processed: 09/18/2023 at 00:07:19 (PDT)

Exoplanet Watch Ephemeris

Parameter Value Uncertainty
Orbital Period (Days) 2.989587731404237 2.2571852231519062e-07
Ephemeris (BJD_TDB) 2460070.7868997185 0.0001803248634759985
Time saved (hours) 0.0144  

Assumed Priors

Parameter Value Uncertainty Units Reference
RA 157.06262 decimal
DEC 25.5731366 decimal
Host Star Metallicity -0.116 0.065 Eastman et al. 2016
Host Star log(g) 4.12 0.08 Log10(cgs) ExoFOP-TESS TOI
Host Star Radius [R_Sun] 1.61 0.06 Sol ExoFOP-TESS TOI
Host Star Effective Temperature [K] 6317.0 109.1 K ExoFOP-TESS TOI
a/Rs 5.792 0.086 Eastman et al. 2016
eccentricity 0.0 Eastman et al. 2016
inclination [degrees] 83.16 0.22 deg Eastman et al. 2016
omega [degrees] 0.0 deg Ivshina & Winn 2022
orbital period [days] 2.989592 1.2e-05 day Ivshina & Winn 2022
Rp 18.82 0.75 R_Earth ExoFOP-TESS TOI
Rp/Rs 0.1101 0 ExoFOP-TESS TOI
ephemeris [JD] 2456279.98996 0.00059 BJD-TDB Ivshina & Winn 2022

Previously Published Mid-Transit Times

Value Uncertainty Units Reference
2456279.98996 0.00059 BJD-TDB Ivshina & Winn 2022
2459610.390465 0.000224 BJD ExoFOP-TESS TOI
2456190.30201 0.00022 BJD-TDB Eastman et al. 2016

Observations

Light curve chart for 0001925
Parameter Value Uncertainty
Am1 1.0671 0.0061
Am2 -0.058 0.014
a/Rs 5.54 0.12
Rp/Rs 0.1086 0.0058
ephemeris [JD] 2458952.6646 0.0024
eccentricity 0.0
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989592
u0 2.52846324607651
u1 -4.58130357459346
u2 4.738924137757446
u3 -1.6860837386250238
duration 0.0911 0.0037
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
CBB Astrodon ExoPlanet-BB 500.0 nm 1000.0 nm
Organization Observer Code Secondary Observers
AAVSO SGEO (collaborate/publish)
Light curve chart for 0000729
Parameter Value Uncertainty
Am1 0.9872 0.0032
Am2 0.0127 0.0037
a/Rs 5.8 0.13
Rp/Rs 0.0937 0.0047
ephemeris [JD] 2459215.7643 0.003
eccentricity 0.0
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989592
u0 2.1012795152043076
u1 -3.8692038839960627
u2 4.414116268242401
u3 -1.6461918336751875
duration 0.1395 0.0046
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
CV Clear (unfiltered) reduced to V sequence 350.0 nm 850.0 nm
Organization Observer Code Secondary Observers
AAVSO SERC (collaborate/publish)
Light curve chart for 0003387
Parameter Value Uncertainty
Am1 0.994 0.011
Am2 0.0055 0.0011
a/Rs 6.09 0.15
Rp/Rs 0.1007 0.0093
ephemeris [JD] 2460064.8074 0.0041
eccentricity 0.0
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989592
u0 3.035426126078914
u1 -5.554500139072163
u2 5.355555751949406
u3 -1.8364816591521582
duration 0.13 0.0062
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
IJ Johnson I 780.0 nm 1020.0 nm
Organization Observer Code Secondary Observers
AAVSO MBEB (collaborate/publish)
Light curve chart for 0003445
Parameter Value Uncertainty
Am1 1.007 0.01
Am2 -0.004 0.0015
a/Rs 5.71 0.21
Rp/Rs 0.101 0.011
ephemeris [JD] 2460070.7848 0.0047
eccentricity 0.0
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989592
u0 3.036077254240239
u1 -5.557407958606408
u2 5.359460563120719
u3 -1.8381297788923652
duration 0.1458 0.0091
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
IJ Johnson I 780.0 nm 1020.0 nm
Organization Observer Code Secondary Observers
AAVSO MBEB (collaborate/publish)
Light curve chart for 6753353170c78a2ee76127ba1d172116
Parameter Value Uncertainty
Am1 1.0 0.00093
Am2 0
a/Rs 5.762 0.035
Rp/Rs 0.10362 0.00096
ephemeris [JD] 2459613.38039 0.00064
eccentricity 0.0
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989592
u0 2.8196744328105106
u1 -5.088210865534548
u2 4.991909142959692
u3 -1.7233726358504113
duration 0.1444 0.0015
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
I Cousins I 721.0 nm 875.0 nm
Organization Observer Code Secondary Observers
EPW TESS (collaborate/publish)
Light curve chart for daaa4a5942cc28747b0d89aec44c485f
Parameter Value Uncertainty
Am1 1.00006 0.00084
Am2 0
a/Rs 5.812 0.033
Rp/Rs 0.10279 0.00097
ephemeris [JD] 2459619.35878 0.00061
eccentricity 0.0
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989592
u0 2.8189859587522257
u1 -5.08480623036361
u2 4.987112972413692
u3 -1.721292626488533
duration 0.1425 0.0015
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
I Cousins I 721.0 nm 875.0 nm
Organization Observer Code Secondary Observers
EPW TESS (collaborate/publish)
Light curve chart for c343782204ba62c7248afab4599db71f
Parameter Value Uncertainty
Am1 1.0 0.00075
Am2 0
a/Rs 5.797 0.033
Rp/Rs 0.10286 0.00093
ephemeris [JD] 2459631.31747 0.0006
eccentricity 0.0
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989592
u0 2.818052978740034
u1 -5.082759738668264
u2 4.985567054907607
u3 -1.7208602206886385
duration 0.1425 0.0014
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
I Cousins I 721.0 nm 875.0 nm
Organization Observer Code Secondary Observers
EPW TESS (collaborate/publish)
Light curve chart for 051f3f90c5ac0b73c8f1ecc19a9fa31b
Parameter Value Uncertainty
Am1 1.00002 0.00081
Am2 0
a/Rs 5.822 0.033
Rp/Rs 0.10235 0.00091
ephemeris [JD] 2459634.30663 0.0006
eccentricity 0.0
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989592
u0 2.817619684930655
u1 -5.080819771312075
u2 4.9829230350660625
u3 -1.7197228744333035
duration 0.1415 0.0014
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
I Cousins I 721.0 nm 875.0 nm
Organization Observer Code Secondary Observers
EPW TESS (collaborate/publish)
Light curve chart for e43bd708a93469772323bb4b16d6f070
Parameter Value Uncertainty
Am1 0.99999 0.00084
Am2 0
a/Rs 5.805 0.034
Rp/Rs 0.10249 0.00093
ephemeris [JD] 2459628.32848 0.0006
eccentricity 0.0
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989592
u0 2.8192575042658996
u1 -5.087569126145113
u2 4.991783838512344
u3 -1.7234721422497552
duration 0.1425 0.0015
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
I Cousins I 721.0 nm 875.0 nm
Organization Observer Code Secondary Observers
EPW TESS (collaborate/publish)
Light curve chart for 0e4a86ff9909bac91b63efa224cb120b
Parameter Value Uncertainty
Am1 1.00005 0.0008
Am2 0
a/Rs 5.792 0.036
Rp/Rs 0.10244 0.00094
ephemeris [JD] 2459610.39048 0.00062
eccentricity 0.0
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989592
u0 2.8180023182191682
u1 -5.082321895660568
u2 4.9848874409869754
u3 -1.7205677892649636
duration 0.1433 0.0015
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
I Cousins I 721.0 nm 875.0 nm
Organization Observer Code Secondary Observers
EPW TESS (collaborate/publish)
Light curve chart for d7b06b56c00f853c34132d25aa42c997
Parameter Value Uncertainty
Am1 1.00001 0.00076
Am2 0
a/Rs 5.79 0.031
Rp/Rs 0.10196 0.00092
ephemeris [JD] 2459616.36975 0.00057
eccentricity 0.0
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989592
u0 2.8186866804565516
u1 -5.085272807716854
u2 4.988744193359493
u3 -1.7221579917611094
duration 0.1433 0.0013
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
I Cousins I 721.0 nm 875.0 nm
Organization Observer Code Secondary Observers
EPW TESS (collaborate/publish)

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