results

KELT-17 b

Total Reductions to Date: 24

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

Exoplanet Watch Ephemeris

Parameter	Value	Uncertainty
Orbital Period (Days)	3.080179678801808	3.8820080316423127e-07
Ephemeris (BJD_TDB)	2459668.724624386	5.4015524384200366e-05
Time saved (hours)	-

Assumed Priors

Parameter	Value	Uncertainty	Units	Reference
RA	125.617407		decimal
DEC	13.7353093		decimal
Host Star Metallicity	-0.018	0.074		Kokori et al. 2023
Host Star log(g)	4.22	0.022	Log10(cgs)	Kokori et al. 2023
Host Star Radius [R_Sun]	1.645	0.06	Sol	Kokori et al. 2023
Host Star Effective Temperature [K]	7454.0	49.0	K	Kokori et al. 2023
a/R_s	6.38	0.18		Kokori et al. 2023
eccentricity	0.0			Kokori et al. 2023
inclination [degrees]	84.87	0.45	deg	Kokori et al. 2023
omega [degrees]	0.0		deg	Kokori et al. 2023
orbital period [days]	3.08017985	5.1e-07	day	Kokori et al. 2023
R_p	17.06	0.58	R_Earth	ExoFOP-TESS TOI
R_p/R_s	0.0945	0		ExoFOP-TESS TOI
ephemeris [JD]	2459440.791304	7.8e-05	BJD-TDB	Kokori et al. 2023

Previously Published Mid-Transit Times

Value	Uncertainty	Units	Reference
2459440.791304	7.8e-05	BJD-TDB	Kokori et al. 2023
2457330.86812	0.00051	BJD-TDB	Ivshina & Winn 2022
2459502.394945	6.073e-05	BJD	ExoFOP-TESS TOI
2457226.142194	0.00033	BJD-TDB	Zhou et al. 2016

Observations

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Parameter	Value	Uncertainty
Am1	1.0076	0.0048
Am2	-0.0051	0.0019
a/R_s	6.21	0.18
R_p/R_s	0.118	0.005
ephemeris [JD]	2459668.722	0.0025
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.394812340857159
u1	-6.221900183262481
u2	5.776022984664391
u3	-1.9489350561896193
duration	0.1545	0.0059

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)

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Parameter	Value	Uncertainty
Am1	0.995	0.0099
Am2	0.005	0.0019
a/R_s	7.27	0.46
R_p/R_s	0.059	0.016
ephemeris [JD]	2459982.8966	0.01
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.2231170640157742
u1	-5.871122527729371
u2	5.523123769699473
u3	-1.8751182236849182
duration	0.114	0.012

Not 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
AAVSO	LPAC (collaborate/publish)

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Parameter	Value	Uncertainty
Am1	0.9868	0.0036
Am2	0.0104	0.0012
a/R_s	5.64	0.25
R_p/R_s	0.0591	0.0045
ephemeris [JD]	2460004.4434	0.0022
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	2.5847490431010876
u1	-4.625325099848739
u2	4.742022515237365
u3	-1.7014463878280717
duration	0.1637	0.0094

Not included in ephemeris calculations

Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )

Filter	Detail	Min	Max
SR	Sloan r	553.1 nm	693.1 nm

Organization	Observer Code	Secondary Observers
AAVSO	SAJB (collaborate/publish)

Light curve chart for e9a235b98601cde4b932c11524b9ff39

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Parameter	Value	Uncertainty
Am1	1.00011	0.00059
Am2	0
a/R_s	6.389	0.054
R_p/R_s	0.0919	0.0011
ephemeris [JD]	2459545.51776	0.00075
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.2207153852458545
u1	-5.862151096594851
u2	5.512020148202359
u3	-1.8705843547178627
duration	0.1437	0.0018

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 dae4d4149c179ea72b1f0a3faee7717d

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Parameter	Value	Uncertainty
Am1	0.99992	0.00068
Am2	0
a/R_s	6.372	0.055
R_p/R_s	0.0913	0.0012
ephemeris [JD]	2459523.95609	0.00079
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.223422252462181
u1	-5.8728019051714835
u2	5.525489764269155
u3	-1.8761100292236383
duration	0.1443	0.0018

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 cbdcfe5afc6274c392fcb367a0212a8d

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Parameter	Value	Uncertainty
Am1	0.99993	0.00067
Am2	0
a/R_s	6.404	0.063
R_p/R_s	0.0922	0.0014
ephemeris [JD]	2459514.71585	0.00086
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.2229647933704273
u1	-5.87024617205366
u2	5.521888789201278
u3	-1.8746073282354905
duration	0.1433	0.002

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 ac311efb27a6e0bb989a4232b7f644e0

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Parameter	Value	Uncertainty
Am1	0.99991	0.00075
Am2	0
a/R_s	6.365	0.053
R_p/R_s	0.0913	0.0012
ephemeris [JD]	2459502.39447	0.00075
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.2231219758517504
u1	-5.870874393605875
u2	5.522702097559947
u3	-1.874949597511148
duration	0.1443	0.0017

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 9da51edd3dca2691134b4b60accd763b

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Parameter	Value	Uncertainty
Am1	0.99995	0.00059
Am2	0
a/R_s	6.363	0.054
R_p/R_s	0.0921	0.0011
ephemeris [JD]	2459530.11646	0.00074
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.221361328330103
u1	-5.864096835074451
u2	5.514196872685398
u3	-1.871461283773113
duration	0.1449	0.0017

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 453e9ca37a829a30c9f1806569208d46

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Parameter	Value	Uncertainty
Am1	0.99992	0.00061
Am2	0
a/R_s	6.36	0.054
R_p/R_s	0.0911	0.0011
ephemeris [JD]	2459527.03612	0.00078
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.2234628104802185
u1	-5.87190147020562
u2	5.523751469407144
u3	-1.8753127273714325
duration	0.1449	0.0017

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 d76222c53d8d8f6873e362621be7286c

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Parameter	Value	Uncertainty
Am1	1.0	0.00062
Am2	0
a/R_s	6.37	0.053
R_p/R_s	0.0908	0.0011
ephemeris [JD]	2459548.5977	0.00072
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.221339225499143
u1	-5.8647954073062305
u2	5.515520487403836
u3	-1.872064223409089
duration	0.1443	0.0017

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 34e732de11543be3ad4c78b3892f833f

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Parameter	Value	Uncertainty
Am1	0.99997	0.0007
Am2	0
a/R_s	6.398	0.057
R_p/R_s	0.0923	0.0012
ephemeris [JD]	2459536.27688	0.00077
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.2221197128470593
u1	-5.867085480045925
u2	5.517920212188453
u3	-1.8729543627661678
duration	0.1437	0.0018

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 a673abd9d4babf61eb663b0feb60ee0c

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Parameter	Value	Uncertainty
Am1	1.00001	0.00065
Am2	0
a/R_s	6.364	0.051
R_p/R_s	0.0924	0.0011
ephemeris [JD]	2459560.91812	0.00075
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.2226574140480335
u1	-5.868906973503407
u2	5.5199859923834715
u3	-1.8737363506738967
duration	0.1449	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 74787a53e2802bc73d96eb0d0c0c6654

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Parameter	Value	Uncertainty
Am1	0.99999	0.00063
Am2	0
a/R_s	6.368	0.056
R_p/R_s	0.0911	0.0012
ephemeris [JD]	2459508.55523	0.00077
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.2221116675514163
u1	-5.867448268241566
u2	5.518599859679149
u3	-1.873263176755453
duration	0.1443	0.0017

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 d85d17f9a7cfbea80cf5b744a92a8cb3

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Parameter	Value	Uncertainty
Am1	1.0	0.00063
Am2	0
a/R_s	6.379	0.055
R_p/R_s	0.0913	0.0011
ephemeris [JD]	2459554.7582	0.00076
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.221258603129317
u1	-5.863695616476815
u2	5.513572333614101
u3	-1.8711352381079722
duration	0.1443	0.0018

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 794eaacde29bfe7b26f26fdd33580048

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Parameter	Value	Uncertainty
Am1	1.0	0.00061
Am2	0
a/R_s	6.327	0.059
R_p/R_s	0.0911	0.0012
ephemeris [JD]	2459542.43709	0.00084
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.2214273850587944
u1	-5.864370735556703
u2	5.514415869727151
u3	-1.8714724370580433
duration	0.1456	0.0019

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 622986b08d8330bcf8f7422cc1afd240

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Parameter	Value	Uncertainty
Am1	0.99997	0.00069
Am2	0
a/R_s	6.381	0.057
R_p/R_s	0.0921	0.0011
ephemeris [JD]	2459517.79641	0.00077
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.220366965855799
u1	-5.860904763109954
u2	5.5105177694000895
u3	-1.8699798900328215
duration	0.1443	0.0018

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 b0a184b0af7ff53c2c1c691b57f71034

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Parameter	Value	Uncertainty
Am1	1.00005	0.00065
Am2	0
a/R_s	6.377	0.054
R_p/R_s	0.0915	0.0012
ephemeris [JD]	2459505.47543	0.00073
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.225142684414304
u1	-5.878795197200494
u2	5.532617152080816
u3	-1.878964556852205
duration	0.1437	0.0017

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 69f50948abed6a48df4cf8c4a0f7bbf1

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Parameter	Value	Uncertainty
Am1	0.99998	0.00062
Am2	0
a/R_s	6.389	0.054
R_p/R_s	0.0917	0.0011
ephemeris [JD]	2459533.19636	0.00074
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.2222796390084216
u1	-5.867780930455008
u2	5.518800466818196
u3	-1.8732990931350741
duration	0.1437	0.0017

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 3b5386238f3fce8dede9a6a3ad0ee4b3

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Parameter	Value	Uncertainty
Am1	1.00003	0.00061
Am2	0
a/R_s	6.366	0.055
R_p/R_s	0.0919	0.0011
ephemeris [JD]	2459570.15898	0.00077
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.2216174949694336
u1	-5.86520510432546
u2	5.515656725635814
u3	-1.8720690340900976
duration	0.1443	0.0017

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 a5fb8e2ba04c2cce8cb9904d300c41f3

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Parameter	Value	Uncertainty
Am1	0.99966	0.00066
Am2	0
a/R_s	6.363	0.058
R_p/R_s	0.0924	0.0012
ephemeris [JD]	2459557.83762	0.00081
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.220769152433237
u1	-5.862219628055362
u2	5.5120458718230605
u3	-1.8705953140650515
duration	0.1449	0.0018

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 009ffa39247b204ac36aacea0726e5fa

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Parameter	Value	Uncertainty
Am1	0.99987	0.00069
Am2	0
a/R_s	6.406	0.056
R_p/R_s	0.0918	0.0012
ephemeris [JD]	2459563.99823	0.00077
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.2229245752602074
u1	-5.870112241862701
u2	5.521616915827861
u3	-1.8744291669468645
duration	0.1431	0.0017

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 3ad04de99c06589757791d2fb6d30e3f

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Parameter	Value	Uncertainty
Am1	0.99997	0.00063
Am2	0
a/R_s	6.364	0.052
R_p/R_s	0.0911	0.0011
ephemeris [JD]	2459576.31916	0.00073
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.221521038327116
u1	-5.864835017563046
u2	5.515140436909374
u3	-1.8718263754914464
duration	0.1443	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 c4edca286c601378f47e0cbc73a32089

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Parameter	Value	Uncertainty
Am1	0.99996	0.00063
Am2	0
a/R_s	6.341	0.054
R_p/R_s	0.0913	0.0011
ephemeris [JD]	2459520.87552	0.00078
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.2219744235151153
u1	-5.866743631657645
u2	5.517531428725573
u3	-1.872762138365419
duration	0.1456	0.0017

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 bc4355418e3570789737b35632174808

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Parameter	Value	Uncertainty
Am1	1.00007	0.00059
Am2	0
a/R_s	6.378	0.055
R_p/R_s	0.0914	0.0011
ephemeris [JD]	2459573.23897	0.00073
eccentricity	0.0
inclination [degrees]	84.87
omega [degrees]	0.0
orbital period [days]	3.08017985
u0	3.2206315927826226
u1	-5.8617854953761235
u2	5.511473414006159
u3	-1.870319429285304
duration	0.1443	0.0018

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)