results

HAT-P-8 b

Timing Plot

Total Reductions to Date: 10

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

Exoplanet Watch Ephemeris

Parameter Value Uncertainty
Orbital Period (Days) 3.0763437873455257 1.6146215334150806e-07
Ephemeris (BJD_TDB) 2459852.04049925 0.0001213414310520272
Time saved (hours) 0.0004  

Assumed Priors

Parameter Value Uncertainty Units Reference
RA 343.0414932 decimal
DEC 35.4471778 decimal
Host Star Metallicity 0.01 0.08 Bonomo et al. 2017
Host Star log(g) 4.23563 0.083992 Log10(cgs) ExoFOP-TESS TOI
Host Star Radius [R_Sun] 1.58 0.08 Sol Kokori et al. 2023
Host Star Effective Temperature [K] 6200.0 80.0 K Kokori et al. 2023
a/Rs 6.29 0.06 Kokori et al. 2023
eccentricity 0.006 0.016 Bonomo et al. 2017
inclination [degrees] 87.1 0.4 deg Kokori et al. 2023
omega [degrees] 116.0 150.0 deg Knutson et al. 2014
orbital period [days] 3.07634347 5.8e-07 day Kokori et al. 2023
Rp 14.23 0.6 R_Earth ExoFOP-TESS TOI
Rp/Rs 0.0974 0 ExoFOP-TESS TOI
ephemeris [JD] 2456052.75596 0.00024 BJD-TDB Kokori et al. 2023

Previously Published Mid-Transit Times

Value Uncertainty Units Reference
2454437.675256667 0.00072 BJD, BJD-TDB Bonomo et al. 2017, Moutou et al. 2011, Latham et al. 2009
2455409.80001 0.00047 BJD-TDB Ivshina & Winn 2022
2455945.0839 0.0003 BJD-TDB Kokori et al. 2022
2456052.75596 0.00024 BJD-TDB Kokori et al. 2023
2459827.429945 0.00024816 BJD ExoFOP-TESS TOI

Observations

Light curve chart for 0000894
Parameter Value Uncertainty
Am1 1.067 0.019
Am2 -0.031 0.012
a/Rs 6.24 0.16
Rp/Rs 0.1947 0.0059
ephemeris [JD] 2459476.7255 0.0027
eccentricity 0.006
inclination [degrees] 87.1
omega [degrees] 116.0
orbital period [days] 3.07634347
u0 1.8730126891594172
u1 -3.395653613208618
u2 4.076675762095077
u3 -1.5540347772986731
duration 0.1474 0.0029
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO LPAC (collaborate/publish)
Light curve chart for 0008472
Parameter Value Uncertainty
Am1 0.9999 0.0027
Am2 0.0001 0.0031
a/Rs 6.045 0.062
Rp/Rs 0.0886 0.0025
ephemeris [JD] 2459821.27825 0.00097
eccentricity 0.006
inclination [degrees] 87.1
omega [degrees] 116.0
orbital period [days] 3.07634347
u0 1.871795678343221
u1 -3.390481478835727
u2 4.069715911548118
u3 -1.5510300504121197
duration 0.1694 0.002
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
V Johnson V 502.8 nm 586.8 nm
Organization Observer Code Secondary Observers
AAVSO GALH (collaborate/publish)
Light curve chart for 8760a512f304fbb207ec92025a86424e
Parameter Value Uncertainty
Am1 1.0 0.002
Am2 0
a/Rs 6.215 0.032
Rp/Rs 0.0925 0.00054
ephemeris [JD] 2459842.81107 0.00041
eccentricity 0.006
inclination [degrees] 87.1
omega [degrees] 116.0
orbital period [days] 3.07634347
u0 2.7706001157130546
u1 -5.01398493829962
u2 4.97997993704331
u3 -1.7365950402492607
duration 0.16543 0.00099
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 8fb6f47d12d5f9f2a34ed60f3aa063df
Parameter Value Uncertainty
Am1 1.0 0.002
Am2 0
a/Rs 6.18 0.03
Rp/Rs 0.09237 0.00054
ephemeris [JD] 2459836.6589 0.00039
eccentricity 0.006
inclination [degrees] 87.1
omega [degrees] 116.0
orbital period [days] 3.07634347
u0 2.7705406653071547
u1 -5.0138862305138865
u2 4.980009420669879
u3 -1.736663781255225
duration 0.16638 0.00098
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 a35d42801aed8cf50725f685e631feaa
Parameter Value Uncertainty
Am1 1.0 0.0019
Am2 0
a/Rs 6.238 0.032
Rp/Rs 0.09177 0.00054
ephemeris [JD] 2459839.73505 0.0004
eccentricity 0.006
inclination [degrees] 87.1
omega [degrees] 116.0
orbital period [days] 3.07634347
u0 2.7702956115489292
u1 -5.013184082072632
u2 4.979273633795775
u3 -1.7363850890751125
duration 0.16452 0.00098
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 ce3b8feba160f83055d2bf2679e8bd85
Parameter Value Uncertainty
Am1 1.0001 0.002
Am2 0
a/Rs 6.176 0.034
Rp/Rs 0.09164 0.00057
ephemeris [JD] 2459848.96414 0.00044
eccentricity 0.006
inclination [degrees] 87.1
omega [degrees] 116.0
orbital period [days] 3.07634347
u0 2.770567436674338
u1 -5.013094208374502
u2 4.978394797168752
u3 -1.7358679512847242
duration 0.1664 0.0011
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 93bc9b7c6653ae0c1fe588c5d2fb3542
Parameter Value Uncertainty
Am1 1.0001 0.002
Am2 0
a/Rs 6.191 0.033
Rp/Rs 0.09145 0.00055
ephemeris [JD] 2459852.04026 0.0004
eccentricity 0.006
inclination [degrees] 87.1
omega [degrees] 116.0
orbital period [days] 3.07634347
u0 2.7714204183191673
u1 -5.017305359199988
u2 4.984311489078773
u3 -1.7384264739259225
duration 0.1654 0.001
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 5a4d3ee110373aef7a1276926c8157a0
Parameter Value Uncertainty
Am1 1.0001 0.002
Am2 0
a/Rs 6.227 0.033
Rp/Rs 0.0919 0.00059
ephemeris [JD] 2459833.58172 0.00042
eccentricity 0.006
inclination [degrees] 87.1
omega [degrees] 116.0
orbital period [days] 3.07634347
u0 2.769881943911978
u1 -5.011184564895073
u2 4.976228850746532
u3 -1.734926155611848
duration 0.1645 0.0011
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 acca5d5b996d125a1e3293966c559b9f
Parameter Value Uncertainty
Am1 1.0 0.0019
Am2 0
a/Rs 6.239 0.03
Rp/Rs 0.09232 0.00053
ephemeris [JD] 2459827.42988 0.00039
eccentricity 0.006
inclination [degrees] 87.1
omega [degrees] 116.0
orbital period [days] 3.07634347
u0 2.7705821683785574
u1 -5.01389858259513
u2 4.97983239027486
u3 -1.7365159018530028
duration 0.16448 0.00097
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 87318e0e5e533f4c5132df65cacd568c
Parameter Value Uncertainty
Am1 1.0 0.002
Am2 0
a/Rs 6.191 0.033
Rp/Rs 0.09244 0.00054
ephemeris [JD] 2459830.50649 0.00041
eccentricity 0.006
inclination [degrees] 87.1
omega [degrees] 116.0
orbital period [days] 3.07634347
u0 2.7702137756781404
u1 -5.012032459512052
u2 4.97713530961746
u3 -1.7353165516184532
duration 0.1654 0.001
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)