results

K2-31 b

Total Reductions to Date: 12

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

Exoplanet Watch Ephemeris

Parameter Value Uncertainty
Orbital Period (Days) - -
Ephemeris (BJD_TDB) - -
Time saved (hours) -  

Assumed Priors

Parameter Value Uncertainty Units Reference
RA 245.4405531 decimal
DEC -23.548273 decimal
Host Star Metallicity 0.08 0.05 Kokori et al. 2023
Host Star log(g) 4.6 0.07 Log10(cgs) Kokori et al. 2023
Host Star Radius [R_Sun] 0.78 0.07 Sol Kokori et al. 2023
Host Star Effective Temperature [K] 5280.0 70.0 K Kokori et al. 2023
a/Rs 5.642 0.007 Kokori et al. 2023
eccentricity 0.0 Grziwa et al. 2016
inclination [degrees] 79.9 0.8 deg Kokori et al. 2023
omega [degrees] 0.0 deg Kokori et al. 2023
orbital period [days] 1.25784887 7.8e-07 day Kokori et al. 2023
Rp 12.57 2.52 R_Earth ExoFOP-TESS TOI
Rp/Rs 0.0859 0 ExoFOP-TESS TOI
ephemeris [JD] 2456952.717941 9.1e-05 BJD-TDB Kokori et al. 2023

Previously Published Mid-Transit Times

Value Uncertainty Units Reference
2456893.59877 0.0001 BJD-TDB Crossfield et al. 2016
2456952.717941 9.1e-05 BJD-TDB Kokori et al. 2023
2457191.70889 0.00024 BJD Grziwa et al. 2016, Dai et al. 2016
2460775.325905 0.00025074 BJD ExoFOP-TESS TOI

Observations

Light curve chart for 0008115
Parameter Value Uncertainty
Am1 0.974 0.045
Am2 0.001 0.086
a/Rs 5.609 0.02
Rp/Rs 0.171 0.051
ephemeris [JD] 2459006.766 0.012
eccentricity 0.0
inclination [degrees] 79.9
omega [degrees] 0.0
orbital period [days] 1.25784887
u0 1.571193259087119
u1 -2.6939388145290395
u2 3.352819284295925
u3 -1.230073678893104
duration 0 0
Not 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 FBIA (collaborate/publish) MOBS
Light curve chart for 0010521
Parameter Value Uncertainty
Am1 0.944 0.025
Am2 0.0227 0.0061
a/Rs 5.613 0.02
Rp/Rs 0.171 0.05
ephemeris [JD] 2459357.719 0.011
eccentricity 0.0
inclination [degrees] 79.9
omega [degrees] 0.0
orbital period [days] 1.25784887
u0 1.5713663464906396
u1 -2.694356488594267
u2 3.3533726670588395
u3 -1.2303824749860657
duration 0.0458 0.007
Not 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 DCMA (collaborate/publish) MOBS
Light curve chart for 0003240
Parameter Value Uncertainty
Am1 0.916 0.024
Am2 0.039 0.012
a/Rs 5.644 0.02
Rp/Rs 0.171 0.049
ephemeris [JD] 2459377.856 0.012
eccentricity 0.0
inclination [degrees] 79.9
omega [degrees] 0.0
orbital period [days] 1.25784887
u0 1.570981068076678
u1 -2.693914069902222
u2 3.3531301842847334
u3 -1.230197132493656
duration 0.0448 0.007
Not 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 SGDA (collaborate/publish) MOBS
Light curve chart for 0006018
Parameter Value Uncertainty
Am1 0.29 0.24
Am2 0.34 0.52
a/Rs 5.643 0.02
Rp/Rs 0.169 0.05
ephemeris [JD] 2459377.87 0.012
eccentricity 0.0
inclination [degrees] 79.9
omega [degrees] 0.0
orbital period [days] 1.25784887
u0 1.570996746460614
u1 -2.693568448047387
u2 3.3525054562577132
u3 -1.2299337047147154
duration 0.0443 0.0072
Not 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 HREB (collaborate/publish) MOBS
Light curve chart for 0003586
Parameter Value Uncertainty
Am1 1.047 0.033
Am2 -0.016 0.012
a/Rs 5.62 0.02
Rp/Rs 0.172 0.05
ephemeris [JD] 2459430.677 0.012
eccentricity 0.0
inclination [degrees] 79.9
omega [degrees] 0.0
orbital period [days] 1.25784887
u0 1.85071825416231
u1 -3.236247567695591
u2 3.7167483321666226
u3 -1.3312189632494755
duration 0.0453 0.0071
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 TKVA (collaborate/publish) MOBS
Light curve chart for 0003073
Parameter Value Uncertainty
Am1 1.044 0.012
Am2 -0.0168 0.0048
a/Rs 5.666 0.02
Rp/Rs 0.155 0.049
ephemeris [JD] 2459636.954 0.011
eccentricity 0.0
inclination [degrees] 79.9
omega [degrees] 0.0
orbital period [days] 1.25784887
u0 1.5709040147169075
u1 -2.6938113388653493
u2 3.3532421493995157
u3 -1.2303347752838723
duration 0.0416 0.0075
Not 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 ITYA (collaborate/publish) MOBS
Light curve chart for 0008998
Parameter Value Uncertainty
Am1 0.931 3.6e-05
Am2 0.023 0.016
a/Rs 5.61 0.02
Rp/Rs 0.059 0.049
ephemeris [JD] 2459635.702 0.012
eccentricity 0.0
inclination [degrees] 79.9
omega [degrees] 0.0
orbital period [days] 1.25784887
u0 1.5711968875559374
u1 -2.6943289009344085
u2 3.3533797822066784
u3 -1.230247718858955
duration 0 0
Not 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 VIVA (collaborate/publish) MOBS
Light curve chart for 0002873
Parameter Value Uncertainty
Am1 1.025 0.021
Am2 -0.008 0.016
a/Rs 5.668 0.02
Rp/Rs 0.054 0.039
ephemeris [JD] 2459670.95 0.013
eccentricity 0.0
inclination [degrees] 79.9
omega [degrees] 0.0
orbital period [days] 1.25784887
u0 1.5714145495328709
u1 -2.6945614039356194
u2 3.3534589620803605
u3 -1.2303120577071796
duration 0 0
Not 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 YLUA (collaborate/publish) MOBS
Light curve chart for 0008852
Parameter Value Uncertainty
Am1 1.04 0.016
Am2 -0.02 0.013
a/Rs 5.613 0.02
Rp/Rs 0.171 0.05
ephemeris [JD] 2459670.95 0.012
eccentricity 0.0
inclination [degrees] 79.9
omega [degrees] 0.0
orbital period [days] 1.25784887
u0 1.571540609169794
u1 -2.6956428224441864
u2 3.3551992649769797
u3 -1.2310970017062224
duration 0.0461 0.007
Not 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 LMI (collaborate/publish) MOBS
Light curve chart for 0012444
Parameter Value Uncertainty
Am1 1.352 0.019
Am2 -0.173 0.052
a/Rs 5.608 0.02
Rp/Rs 0.171 0.037
ephemeris [JD] 2459675.9787 0.0089
eccentricity 0.0
inclination [degrees] 79.9
omega [degrees] 0.0
orbital period [days] 1.25784887
u0 1.8507976078362358
u1 -3.237140928081714
u2 3.718222344064694
u3 -1.3318789684133852
duration 0.0463 0.0051
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 ZKEA (collaborate/publish) MOBS
Light curve chart for 0003923
Parameter Value Uncertainty
Am1 1.016 0.013
Am2 -0.0062 0.0053
a/Rs 5.674 0.02
Rp/Rs 0.096 0.044
ephemeris [JD] 2459694.821 0.011
eccentricity 0.0
inclination [degrees] 79.9
omega [degrees] 0.0
orbital period [days] 1.25784887
u0 1.5713106714333192
u1 -2.694053809391854
u2 3.352845248999011
u3 -1.2301020610791888
duration 0.0329 0.008
Not 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 CPHB (collaborate/publish) MOBS
Light curve chart for 0009665
Parameter Value Uncertainty
Am1 1.074 0.022
Am2 -0.0314 0.0083
a/Rs 5.616 0.02
Rp/Rs 0.17 0.045
ephemeris [JD] 2459694.849 0.013
eccentricity 0.0
inclination [degrees] 79.9
omega [degrees] 0.0
orbital period [days] 1.25784887
u0 1.5713337320473546
u1 -2.694889921013471
u2 3.3541747159658097
u3 -1.230618477018595
duration 0.037 0.01
Not 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 KMAT (collaborate/publish) MOBS