results

HAT-P-21 b

Timing Plot

Total Reductions to Date: 12

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

Exoplanet Watch Ephemeris

Parameter Value Uncertainty
Orbital Period (Days) 4.124488121960861 6.460151002256589e-07
Ephemeris (BJD_TDB) 2460044.787356355 0.00028873022953982336
Time saved (hours) -  

Assumed Priors

Parameter Value Uncertainty Units Reference
RA 171.2749348 decimal
DEC 41.0280207 decimal
Host Star Metallicity 0.01 0.08 Kokori et al. 2023
Host Star log(g) 4.33 0.06 Log10(cgs) Kokori et al. 2023
Host Star Radius [R_Sun] 1.105 0.083 Sol Kokori et al. 2023
Host Star Effective Temperature [K] 5588.0 80.0 K Kokori et al. 2023
a/Rs 9.6 0.7 Kokori et al. 2023
eccentricity 0.228 0.016 Kokori et al. 2023
inclination [degrees] 87.2 0.7 deg Kokori et al. 2023
omega [degrees] 309.0 3.0 deg Kokori et al. 2023
orbital period [days] 4.12448852 6.9e-07 day Kokori et al. 2023
Rp 12.42 0.67 R_Earth ExoFOP-TESS TOI
Rp/Rs 0.0979 0 ExoFOP-TESS TOI
ephemeris [JD] 2458159.89639 0.00027 BJD-TDB Kokori et al. 2023

Previously Published Mid-Transit Times

Value Uncertainty Units Reference
2454996.413505 0.00069 BJD-TDB, BJD-UTC Bonomo et al. 2017, Bakos et al. 2010
2458159.89639 0.00027 BJD-TDB Kokori et al. 2023
2458902.30403 0.00044 BJD-TDB Ivshina & Winn 2022
2458910.55349 0.00051 BJD Patel & Espinoza 2022
2459632.338336 0.0005015 BJD ExoFOP-TESS TOI

Observations

Light curve chart for 0001473
Parameter Value Uncertainty
Am1 0.9882 0.0061
Am2 0.0105 0.0044
a/Rs 10.79 1.14
Rp/Rs 0.083 0.012
ephemeris [JD] 2459714.836 0.01
eccentricity 0.228
inclination [degrees] 87.2
omega [degrees] 309.0
orbital period [days] 4.12448852
u0 2.3724067441860046
u1 -4.238572295373815
u2 4.4386276436637635
u3 -1.572462026335248
duration 0.118 0.015
Included in ephemeris calculations
Light Curve ( PNG, PDF - high resolution )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter Detail Min Max
CBB Astrodon ExoPlanet-BB 500.0 nm 1000.0 nm
Organization Observer Code Secondary Observers
AAVSO MBEB (collaborate/publish)
Light curve chart for 0003187
Parameter Value Uncertainty
Am1 1.0176 0.0085
Am2 -0.014 0.026
a/Rs 10.4 0.91
Rp/Rs 0.134 0.02
ephemeris [JD] 2460044.768 0.0057
eccentricity 0.228
inclination [degrees] 87.2
omega [degrees] 309.0
orbital period [days] 4.12448852
u0 2.61685923317394
u1 -4.669115191626861
u2 4.676412852703567
u3 -1.6241568245666653
duration 0.097 0.011
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)
Light curve chart for 82e2c024364b10b93ced2c46462096e8
Parameter Value Uncertainty
Am1 1.0001 0.0019
Am2 0
a/Rs 9.31 0.11
Rp/Rs 0.0915 0.0014
ephemeris [JD] 2458922.9264 0.0011
eccentricity 0.228
inclination [degrees] 87.2
omega [degrees] 309.0
orbital period [days] 4.12448852
u0 2.6164054866061734
u1 -4.667401050240474
u2 4.674257596336536
u3 -1.6232619630503686
duration 0.1602 0.0025
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 ec0cd171af72ae038e79fcda4be0138d
Parameter Value Uncertainty
Am1 1.0005 0.0018
Am2 0
a/Rs 9.53 0.11
Rp/Rs 0.0911 0.0014
ephemeris [JD] 2459628.2137 0.001
eccentricity 0.228
inclination [degrees] 87.2
omega [degrees] 309.0
orbital period [days] 4.12448852
u0 2.618099072372623
u1 -4.6728218513387985
u2 4.680571767389501
u3 -1.6258489186773715
duration 0.1553 0.0024
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 e50262f215070ccd4190ac81e1381c0c
Parameter Value Uncertainty
Am1 1.0003 0.0019
Am2 0
a/Rs 9.7 0.13
Rp/Rs 0.0906 0.0014
ephemeris [JD] 2459619.9642 0.0012
eccentricity 0.228
inclination [degrees] 87.2
omega [degrees] 309.0
orbital period [days] 4.12448852
u0 2.61606335373997
u1 -4.6669650843485435
u2 4.674224713382004
u3 -1.6233229131220548
duration 0.1513 0.0027
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 210fa1d972886b970c548c8184cd44df
Parameter Value Uncertainty
Am1 0.9998 0.0018
Am2 0
a/Rs 9.62 0.11
Rp/Rs 0.0911 0.0014
ephemeris [JD] 2458910.5523 0.001
eccentricity 0.228
inclination [degrees] 87.2
omega [degrees] 309.0
orbital period [days] 4.12448852
u0 2.617211657789978
u1 -4.670271252209879
u2 4.677773724129328
u3 -1.624714060005167
duration 0.1537 0.0024
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 177d15efb30504bdeb744d4e7eed909b
Parameter Value Uncertainty
Am1 0.9998 0.0019
Am2 0
a/Rs 9.42 0.13
Rp/Rs 0.0917 0.0015
ephemeris [JD] 2458902.3043 0.0013
eccentricity 0.228
inclination [degrees] 87.2
omega [degrees] 309.0
orbital period [days] 4.12448852
u0 2.6176123294167053
u1 -4.671707311653409
u2 4.679578234647232
u3 -1.6254831826793779
duration 0.1578 0.0029
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 31c6a1613b363aa2290b26dc8c4df89f
Parameter Value Uncertainty
Am1 0.9999 0.0019
Am2 0
a/Rs 9.37 0.12
Rp/Rs 0.0896 0.0014
ephemeris [JD] 2458918.8028 0.0011
eccentricity 0.228
inclination [degrees] 87.2
omega [degrees] 309.0
orbital period [days] 4.12448852
u0 2.616548435156735
u1 -4.668615361245768
u2 4.67618720657866
u3 -1.6241202108090067
duration 0.1583 0.0026
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 da42421f05276c14da74ecfe5e15a093
Parameter Value Uncertainty
Am1 0.9998 0.0019
Am2 0
a/Rs 9.54 0.12
Rp/Rs 0.0909 0.0014
ephemeris [JD] 2459611.7168 0.0011
eccentricity 0.228
inclination [degrees] 87.2
omega [degrees] 309.0
orbital period [days] 4.12448852
u0 2.6167776919681245
u1 -4.668678595028092
u2 4.675763557725368
u3 -1.6238625849910946
duration 0.1553 0.0026
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 4ed9ab5b26880372732ea1d7fa94bf06
Parameter Value Uncertainty
Am1 1.0002 0.0017
Am2 0
a/Rs 9.48 0.12
Rp/Rs 0.0903 0.0014
ephemeris [JD] 2459615.8406 0.0011
eccentricity 0.228
inclination [degrees] 87.2
omega [degrees] 309.0
orbital period [days] 4.12448852
u0 2.6175775983545075
u1 -4.671557357562837
u2 4.67932807430408
u3 -1.6253482453683286
duration 0.1559 0.0027
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 dc964143db21fd1cc18080b4a9ffac9c
Parameter Value Uncertainty
Am1 0.9999 0.0017
Am2 0
a/Rs 9.426 0.097
Rp/Rs 0.0914 0.0013
ephemeris [JD] 2459632.33777 0.00095
eccentricity 0.228
inclination [degrees] 87.2
omega [degrees] 309.0
orbital period [days] 4.12448852
u0 2.616406706791949
u1 -4.667508280651802
u2 4.674417725019995
u3 -1.62331608150589
duration 0.1578 0.0022
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 57513008e63250d519b6968f3c5b86b4
Parameter Value Uncertainty
Am1 1.0005 0.0018
Am2 0
a/Rs 9.53 0.14
Rp/Rs 0.0892 0.0015
ephemeris [JD] 2458906.4307 0.0012
eccentricity 0.228
inclination [degrees] 87.2
omega [degrees] 309.0
orbital period [days] 4.12448852
u0 2.6172489387827578
u1 -4.670231228154332
u2 4.6775744883486805
u3 -1.6245921292758152
duration 0.1551 0.003
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)