results

WASP-21 b

Timing Plot

Total Reductions to Date: 9

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

Exoplanet Watch Ephemeris

Parameter Value Uncertainty
Orbital Period (Days) 4.322719199252618 1.6206121957789687e-07
Ephemeris (BJD_TDB) 2460193.777201627 8.587670856493072e-07
Time saved (hours) 0.0003  

Assumed Priors

Parameter Value Uncertainty Units Reference
RA 347.4928024 decimal
DEC 18.3961597 decimal
Host Star Metallicity -0.46 0.11 Chen et al. 2020
Host Star log(g) 4.277 0.026 Log10(cgs) Chen et al. 2020
Host Star Radius [R_Sun] 1.136 0.051 Sol Chen et al. 2020
Host Star Effective Temperature [K] 5800.0 100.0 K Chen et al. 2020
a/Rs 10.54 0.15 Kokori et al. 2023
eccentricity 0.048 Bonomo et al. 2017
inclination [degrees] 88.8 0.8 deg Kokori et al. 2023
omega [degrees] 0.0 deg Kokori et al. 2023
orbital period [days] 4.32250416 8e-07 day Kokori et al. 2023
Rp 12.89 0.11 R_Earth Alderson et al. 2020
Rp/Rs 0.1093 0 ExoFOP-TESS TOI
ephemeris [JD] 2457738.54027 0.00017 BJD-TDB Kokori et al. 2023

Previously Published Mid-Transit Times

Value Uncertainty Units Reference
2454743.0415366665 0.0010666666666666665 BJD-TDB, HJD Bonomo et al. 2017, Seeliger et al. 2015, Bouchy et al. 2010
2456181.93874 0.00031 BJD-TDB Chen et al. 2020
2456558.49577 0.0006 BJD-TDB Ivshina & Winn 2022
2457660.73516 0.00016 BJD-TDB Kokori et al. 2022
2457738.54027 0.00017 BJD-TDB Kokori et al. 2023
2459826.311145 0.00043239 BJD ExoFOP-TESS TOI

Observations

Light curve chart for 0000481
Parameter Value Uncertainty
Am1 1.1536 0.0097
Am2 0.0041 0.0051
a/Rs 10.29 0.27
Rp/Rs 0.0954 0.0043
ephemeris [JD] 2459095.8095 0.002
eccentricity 0.048
inclination [degrees] 88.8
omega [degrees] 0.0
orbital period [days] 4.32250416
u0 2.156256635135794
u1 -3.6975123836421337
u2 3.9994982468137863
u3 -1.4582424387102786
duration 0.1437 0.0041
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 JBEB (collaborate/publish)
Light curve chart for 0004061
Parameter Value Uncertainty
Am1 0.9983 0.0035
Am2 0.0011 0.0011
a/Rs 10.41 0.27
Rp/Rs 0.1057 0.0037
ephemeris [JD] 2460141.852 0.0018
eccentricity 0.048
inclination [degrees] 88.8
omega [degrees] 0.0
orbital period [days] 4.32250416
u0 2.435045644202747
u1 -4.2845529782776115
u2 4.430730178541181
u3 -1.5812227784432915
duration 0.1435 0.004
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 0004443
Parameter Value Uncertainty
Am1 0.9983 0.0035
Am2 0.0014 0.0016
a/Rs 10.86 0.24
Rp/Rs 0.1097 0.0038
ephemeris [JD] 2460193.7265 0.0016
eccentricity 0.048
inclination [degrees] 88.8
omega [degrees] 0.0
orbital period [days] 4.32250416
u0 2.4357147056857853
u1 -4.286688795111477
u2 4.433158812748386
u3 -1.58218465726348
duration 0.138 0.0033
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 f4f1eb4dcbe4d1eaf6475eaa8e698241
Parameter Value Uncertainty
Am1 0.9999 0.0038
Am2 0
a/Rs 10.8 0.11
Rp/Rs 0.10076 0.00099
ephemeris [JD] 2459830.63307 0.00061
eccentricity 0.048
inclination [degrees] 88.8
omega [degrees] 0.0
orbital period [days] 4.32250416
u0 2.7638732347753145
u1 -4.976751898271669
u2 4.93885133310039
u3 -1.725972596009416
duration 0.1374 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 11d0cd4a8b62fd78af99a8d776ec6c14
Parameter Value Uncertainty
Am1 1.0005 0.0038
Am2 0
a/Rs 10.499 0.1
Rp/Rs 0.1034 0.001
ephemeris [JD] 2459839.2788 0.00059
eccentricity 0.048
inclination [degrees] 88.8
omega [degrees] 0.0
orbital period [days] 4.32250416
u0 2.764774109419128
u1 -4.981986160142401
u2 4.946405219714737
u3 -1.7291930952842822
duration 0.142 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 ee75aaab2e1769117c7653078f09c55e
Parameter Value Uncertainty
Am1 1.0 0.0038
Am2 0
a/Rs 10.58 0.11
Rp/Rs 0.1016 0.0011
ephemeris [JD] 2459847.92361 0.00062
eccentricity 0.048
inclination [degrees] 88.8
omega [degrees] 0.0
orbital period [days] 4.32250416
u0 2.7650086732555406
u1 -4.98164695302607
u2 4.945259656561521
u3 -1.7286213031008795
duration 0.1403 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 e5bd31b5cb3b99b27b840024763e3b5a
Parameter Value Uncertainty
Am1 1.0 0.0037
Am2 0
a/Rs 10.78 0.11
Rp/Rs 0.1013 0.001
ephemeris [JD] 2459843.60145 0.00064
eccentricity 0.048
inclination [degrees] 88.8
omega [degrees] 0.0
orbital period [days] 4.32250416
u0 2.735086610967484
u1 -4.879761421887675
u2 4.825369617071588
u3 -1.6806947342477856
duration 0.138 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 abc5558aece4acccb54c49c278e070cb
Parameter Value Uncertainty
Am1 1.0005 0.0038
Am2 0
a/Rs 10.65 0.1
Rp/Rs 0.1027 0.001
ephemeris [JD] 2459852.24693 0.00061
eccentricity 0.048
inclination [degrees] 88.8
omega [degrees] 0.0
orbital period [days] 4.32250416
u0 2.7640206474487887
u1 -4.978289719904572
u2 4.941201673628259
u3 -1.7269325275428336
duration 0.1398 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 6fd7d56f6a08e3c5c7500da1aed05869
Parameter Value Uncertainty
Am1 1.0002 0.0037
Am2 0
a/Rs 10.885 0.099
Rp/Rs 0.1033 0.001
ephemeris [JD] 2459826.31157 0.00056
eccentricity 0.048
inclination [degrees] 88.8
omega [degrees] 0.0
orbital period [days] 4.32250416
u0 2.7648949503129154
u1 -4.981003006914029
u2 4.944505027302953
u3 -1.7283968970229733
duration 0.1363 0.0013
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)