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HAT-P-21 b

View target in exoplanet catalog
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Total Reductions to Date: 12

Date Processed: 09/18/2023 at 00:07:19 (PDT)

Exoplanet Watch Ephemeris

Parameter Value Uncertainty
Orbital Period (Days) 4.124488213608296 6.766222519076905e-07
Ephemeris (BJD_TDB) 2460044.7873096517 0.0002840386411807652
Time saved (hours) 0.0009  

Assumed Priors

Parameter Value Uncertainty Units Reference
RA 171.2749348 decimal
DEC 41.0280207 decimal
Host Star Metallicity 0.01 0.08 Patel & Espinoza 2022
Host Star log(g) 4.33 0.06 Log10(cgs) Patel & Espinoza 2022
Host Star Radius [R_Sun] 1.21 0.17 Sol Patel & Espinoza 2022
Host Star Effective Temperature [K] 5588.0 80.0 K Patel & Espinoza 2022
a/Rs 8.94 0.7 Patel & Espinoza 2022
eccentricity 0.217 0.01 Bonomo et al. 2017
inclination [degrees] 87.2 0.7 deg Bonomo et al. 2017
omega [degrees] 305.8 2.1 deg Bonomo et al. 2017
orbital period [days] 4.1244799 6.3e-06 day Patel & Espinoza 2022
Rp 12.42 0.67 R_Earth ExoFOP-TESS TOI
Rp/Rs 0.0979 0 ExoFOP-TESS TOI
ephemeris [JD] 2458910.55349 0.00051 BJD Patel & Espinoza 2022

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
2458902.30403 0.00044 BJD-TDB Ivshina & Winn 2022
2458910.55349 0.00051 BJD Patel & Espinoza 2022
2459632.338336 0.000501 BJD ExoFOP-TESS TOI

Observations

Light curve chart for 0001473
Parameter Value Uncertainty
Am1 0.989 0.0061
Am2 0.0099 0.004
a/Rs 10.72 0.95
Rp/Rs 0.082 0.012
ephemeris [JD] 2459714.8354 0.0083
eccentricity 0.217
inclination [degrees] 87.2
omega [degrees] 305.8
orbital period [days] 4.1244799
u0 2.372219934172702
u1 -4.238233055624258
u2 4.438549337486729
u3 -1.572536149895634
duration 0.119 0.013
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 1.0187 0.0085
Am2 -0.015 0.026
a/Rs 10.17 0.84
Rp/Rs 0.134 0.02
ephemeris [JD] 2460044.7667 0.006
eccentricity 0.217
inclination [degrees] 87.2
omega [degrees] 305.8
orbital period [days] 4.1244799
u0 2.6169171190102865
u1 -4.669150355696792
u2 4.676365357273735
u3 -1.6241320509039556
duration 0.098 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 9.29 0.11
Rp/Rs 0.0915 0.0015
ephemeris [JD] 2458922.9262 0.0011
eccentricity 0.217
inclination [degrees] 87.2
omega [degrees] 305.8
orbital period [days] 4.1244799
u0 2.617511295226611
u1 -4.670610708051229
u2 4.677713376894941
u3 -1.6246138943669624
duration 0.161 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 9.54 0.11
Rp/Rs 0.0911 0.0014
ephemeris [JD] 2459628.2137 0.001
eccentricity 0.217
inclination [degrees] 87.2
omega [degrees] 305.8
orbital period [days] 4.1244799
u0 2.6173770183821943
u1 -4.670615030078901
u2 4.6780330663851855
u3 -1.6247949849803542
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 9.71 0.13
Rp/Rs 0.091 0.0015
ephemeris [JD] 2459619.9641 0.0011
eccentricity 0.217
inclination [degrees] 87.2
omega [degrees] 305.8
orbital period [days] 4.1244799
u0 2.616069652109193
u1 -4.666496350786238
u2 4.673333359873718
u3 -1.6229065915585794
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 9.59 0.12
Rp/Rs 0.091 0.0014
ephemeris [JD] 2458910.5524 0.0011
eccentricity 0.217
inclination [degrees] 87.2
omega [degrees] 305.8
orbital period [days] 4.1244799
u0 2.61702876942803
u1 -4.669599759743943
u2 4.676958541993544
u3 -1.6243874819855186
duration 0.1537 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 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] 2458902.3042 0.0012
eccentricity 0.217
inclination [degrees] 87.2
omega [degrees] 305.8
orbital period [days] 4.1244799
u0 2.616336066854962
u1 -4.6674833704643985
u2 4.674511750730714
u3 -1.6233643774656237
duration 0.1578 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)
Light curve chart for 31c6a1613b363aa2290b26dc8c4df89f
Parameter Value Uncertainty
Am1 0.9999 0.0019
Am2 0
a/Rs 9.36 0.12
Rp/Rs 0.0896 0.0014
ephemeris [JD] 2458918.8028 0.0012
eccentricity 0.217
inclination [degrees] 87.2
omega [degrees] 305.8
orbital period [days] 4.1244799
u0 2.6164587319196464
u1 -4.66778527785262
u2 4.6748492380265
u3 -1.6235226224328434
duration 0.1591 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 da42421f05276c14da74ecfe5e15a093
Parameter Value Uncertainty
Am1 0.9998 0.0019
Am2 0
a/Rs 9.53 0.12
Rp/Rs 0.0908 0.0015
ephemeris [JD] 2459611.7169 0.0011
eccentricity 0.217
inclination [degrees] 87.2
omega [degrees] 305.8
orbital period [days] 4.1244799
u0 2.6178943208938725
u1 -4.671998470655848
u2 4.679472792255542
u3 -1.6253685727639877
duration 0.1553 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 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] 2459615.8405 0.0011
eccentricity 0.217
inclination [degrees] 87.2
omega [degrees] 305.8
orbital period [days] 4.1244799
u0 2.616220651262739
u1 -4.666905748112912
u2 4.673644576761788
u3 -1.6229594102688845
duration 0.1567 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 9.42 0.1
Rp/Rs 0.0914 0.0013
ephemeris [JD] 2459632.33773 0.00096
eccentricity 0.217
inclination [degrees] 87.2
omega [degrees] 305.8
orbital period [days] 4.1244799
u0 2.61745291549923
u1 -4.671353767124924
u2 4.679263696267029
u3 -1.6253627749148714
duration 0.1578 0.0023
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 0.13
Rp/Rs 0.0892 0.0015
ephemeris [JD] 2458906.4307 0.0012
eccentricity 0.217
inclination [degrees] 87.2
omega [degrees] 305.8
orbital period [days] 4.1244799
u0 2.6168476592504106
u1 -4.6686715252758075
u2 4.675606954666777
u3 -1.623783018969407
duration 0.1551 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)

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