results

KELT-4 A b

Timing Plot

Total Reductions to Date: 11

Date Processed: 09/06/2025 at 07:00:04 (PDT)

Exoplanet Watch Ephemeris

Parameter Value Uncertainty
Orbital Period (Days) 2.989587886910407 2.1045432547945392e-07
Ephemeris (BJD_TDB) 2460070.787093423 0.00018289045165184728
Time saved (hours) 0.0053  

Assumed Priors

Parameter Value Uncertainty Units Reference
RA 157.06262 decimal
DEC 25.5731366 decimal
Host Star Metallicity 0.12 0.07 Knudstrup et al. 2024
Host Star log(g) 4.11 0.03 Log10(cgs) Knudstrup et al. 2024
Host Star Radius [R_Sun] 1.6 0.04 Sol Knudstrup et al. 2024
Host Star Effective Temperature [K] 6207.0 75.0 K Knudstrup et al. 2024
a/Rs 5.8 0.2 Knudstrup et al. 2024
eccentricity 0.03 0.03 Knudstrup et al. 2024
inclination [degrees] 83.16 0.22 deg Kokori et al. 2023
omega [degrees] 0.0 deg Knudstrup et al. 2024
orbital period [days] 2.989594 5e-06 day Knudstrup et al. 2024
Rp 19.06 0.56 R_Earth Knudstrup et al. 2024
Rp/Rs 0.1101 0 ExoFOP-TESS TOI
ephemeris [JD] 2456617.81302 0.00031 BJD-TDB Kokori et al. 2023

Previously Published Mid-Transit Times

Value Uncertainty Units Reference
2456617.81302 0.00031 BJD-TDB Kokori et al. 2023
2456279.98996 0.00059 BJD-TDB Ivshina & Winn 2022
2459610.390465 0.0002238 BJD ExoFOP-TESS TOI
2456190.30201 0.00022 BJD-TDB Eastman et al. 2016

Observations

Light curve chart for 0001925
Parameter Value Uncertainty
Am1 1.0664 0.0061
Am2 -0.058 0.015
a/Rs 5.49 0.24
Rp/Rs 0.1088 0.0061
ephemeris [JD] 2458952.666 0.0054
eccentricity 0.03
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989594
u0 2.559204277876913
u1 -4.653808168291437
u2 4.793612777290449
u3 -1.699008815445528
duration 0.091 0.0074
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 0.9867 0.0032
Am2 0.0131 0.0036
a/Rs 5.8 0.14
Rp/Rs 0.0935 0.0047
ephemeris [JD] 2459215.7646 0.003
eccentricity 0.03
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989594
u0 2.132528608316138
u1 -3.906490257983009
u2 4.390982994894132
u3 -1.6170212797965156
duration 0.1395 0.0048
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 0.0054 0.0012
a/Rs 6.01 0.28
Rp/Rs 0.099 0.0097
ephemeris [JD] 2460064.809 0.0051
eccentricity 0.03
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989594
u0 3.060579498477866
u1 -5.629306280099773
u2 5.432853072377544
u3 -1.8641262097998164
duration 0.133 0.011
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 1.006 0.01
Am2 -0.0039 0.0015
a/Rs 5.69 0.29
Rp/Rs 0.099 0.011
ephemeris [JD] 2460070.7835 0.0052
eccentricity 0.03
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989594
u0 3.061006214525009
u1 -5.6301335646029305
u2 5.433431746312228
u3 -1.8643043152698642
duration 0.146 0.012
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 1.00001 0.00093
Am2 0
a/Rs 5.775 0.034
Rp/Rs 0.1042 0.001
ephemeris [JD] 2459613.38068 0.00063
eccentricity 0.03
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989594
u0 2.8411567662025123
u1 -5.149860533980328
u2 5.053643388176811
u3 -1.7449395450938412
duration 0.1435 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 1.00005 0.00084
Am2 0
a/Rs 5.812 0.033
Rp/Rs 0.1028 0.001
ephemeris [JD] 2459619.359 0.00061
eccentricity 0.03
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989594
u0 2.841310255555706
u1 -5.149578649299709
u2 5.052780141423773
u3 -1.7445116723874787
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 c343782204ba62c7248afab4599db71f
Parameter Value Uncertainty
Am1 1.0 0.00075
Am2 0
a/Rs 5.799 0.033
Rp/Rs 0.10288 0.00095
ephemeris [JD] 2459631.3177 0.00059
eccentricity 0.03
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989594
u0 2.841645227095237
u1 -5.1514024385141175
u2 5.055433926455416
u3 -1.7456766397046999
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 051f3f90c5ac0b73c8f1ecc19a9fa31b
Parameter Value Uncertainty
Am1 1.00002 0.00081
Am2 0
a/Rs 5.824 0.035
Rp/Rs 0.10233 0.00095
ephemeris [JD] 2459634.30686 0.00062
eccentricity 0.03
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989594
u0 2.8410926652026283
u1 -5.149320588872677
u2 5.052797930529819
u3 -1.7445699315672134
duration 0.1415 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 e43bd708a93469772323bb4b16d6f070
Parameter Value Uncertainty
Am1 0.99999 0.00084
Am2 0
a/Rs 5.807 0.034
Rp/Rs 0.10248 0.00095
ephemeris [JD] 2459628.32869 0.0006
eccentricity 0.03
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989594
u0 2.841118647269221
u1 -5.149987269509615
u2 5.054035250965234
u3 -1.7451665534138465
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 0e4a86ff9909bac91b63efa224cb120b
Parameter Value Uncertainty
Am1 1.00005 0.0008
Am2 0
a/Rs 5.812 0.037
Rp/Rs 0.10244 0.00096
ephemeris [JD] 2459610.3908 0.00063
eccentricity 0.03
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989594
u0 2.8405375064309535
u1 -5.14773157172586
u2 5.051111615371376
u3 -1.7439174748090416
duration 0.1423 0.0016
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 1.00002 0.00077
Am2 0
a/Rs 5.789 0.032
Rp/Rs 0.1019 0.00094
ephemeris [JD] 2459616.36996 0.00058
eccentricity 0.03
inclination [degrees] 83.16
omega [degrees] 0.0
orbital period [days] 2.989594
u0 2.8405753453164206
u1 -5.147541876040916
u2 5.050746045325888
u3 -1.7437794393394115
duration 0.1433 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)