results

KELT-8 b

Timing Plot

Total Reductions to Date: 3

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

Exoplanet Watch Ephemeris

Parameter Value Uncertainty
Orbital Period (Days) 3.2440811980051905 7.021570627588837e-07
Ephemeris (BJD_TDB) 2460130.805228771 0.00042514468158338795
Time saved (hours) -  

Assumed Priors

Parameter Value Uncertainty Units Reference
RA 283.3054489 decimal
DEC 24.1272483 decimal
Host Star Metallicity 0.272 0.038 Kokori et al. 2023
Host Star log(g) 4.078 0.049 Log10(cgs) Kokori et al. 2023
Host Star Radius [R_Sun] 1.67 0.14 Sol Kokori et al. 2023
Host Star Effective Temperature [K] 5754.0 54.0 K Kokori et al. 2023
a/Rs 5.9 0.4 Kokori et al. 2023
eccentricity 0.04 0.05 Kokori et al. 2023
inclination [degrees] 82.7 0.8 deg Kokori et al. 2023
omega [degrees] 85.0 87.0 deg Kokori et al. 2023
orbital period [days] 3.2440816 1e-06 day Kokori et al. 2023
Rp 21.05 1.28 R_Earth ExoFOP-TESS TOI
Rp/Rs 0.1225 0 ExoFOP-TESS TOI
ephemeris [JD] 2457986.46737 0.00026 BJD-TDB Kokori et al. 2023

Previously Published Mid-Transit Times

Value Uncertainty Units Reference
2456883.4803 0.0007 BJD-TDB Bonomo et al. 2017, Fulton et al. 2015
2457396.04496 0.00055 BJD-TDB Mallonn et al. 2019
2457574.46926 0.0007 BJD-TDB Ivshina & Winn 2022
2457986.46737 0.00026 BJD-TDB Kokori et al. 2023
2459021.32978 0.00031 BJD Patel & Espinoza 2022
2459391.154184 0.00045708 BJD ExoFOP-TESS TOI

Observations

Light curve chart for 0003979
Parameter Value Uncertainty
Am1 0.998 0.0063
Am2 0.0028 0.0055
a/Rs 5.85 0.15
Rp/Rs 0.1045 0.0068
ephemeris [JD] 2460130.8092 0.0026
eccentricity 0.04
inclination [degrees] 82.7
omega [degrees] 85.0
orbital period [days] 3.2440816
u0 2.270363429580297
u1 -3.9669816992435623
u2 4.173507452751608
u3 -1.4768891208982349
duration 0.1449 0.0063
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
RJ Johnson R 590.0 nm 810.0 nm
Organization Observer Code Secondary Observers
AAVSO MBEB (collaborate/publish)
Light curve chart for 0011107
Parameter Value Uncertainty
Am1 1.0824 0.0081
Am2 -0.048 0.038
a/Rs 4.46 0.82
Rp/Rs 0.188 0.023
ephemeris [JD] 2460130.8261 0.0013
eccentricity 0.04
inclination [degrees] 82.7
omega [degrees] 85.0
orbital period [days] 3.2440816
u0 2.070899093208326
u1 -3.596772919327256
u2 3.942974115489641
u3 -1.417100230615818
duration 0.228 0.031
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
R Cousins R 561.7 nm 719.7 nm
Organization Observer Code Secondary Observers
AAVSO AKV (collaborate/publish)
Light curve chart for 0004149
Parameter Value Uncertainty
Am1 1.007 0.011
Am2 -0.001 0.014
a/Rs 4.98 0.75
Rp/Rs 0.13 0.022
ephemeris [JD] 2460156.738 0.011
eccentricity 0.04
inclination [degrees] 82.7
omega [degrees] 85.0
orbital period [days] 3.2440816
u0 1.9810897833716792
u1 -3.604689651607109
u2 4.120267731131336
u3 -1.4966678014991333
duration 0.187 0.026
Not included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
CV MObs CV 350.0 nm 850.0 nm
Organization Observer Code Secondary Observers
AAVSO NANF (collaborate/publish)