results

TRAPPIST-1 b

Total Reductions to Date: 2

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 346.6263919 decimal
DEC -5.0434618 decimal
Host Star Metallicity 0.0535 0.088 Ducrot et al. 2020
Host Star log(g) 5.2396 0.0056 Log10(cgs) Rathcke et al. 2025
Host Star Radius [R_Sun] 0.1192 0.0013 Sol Rathcke et al. 2025
Host Star Effective Temperature [K] 2566.0 26.0 K Rathcke et al. 2025
a/Rs 20.843 0.094 Agol et al. 2021
eccentricity 0.0 0.00304 Rathcke et al. 2025
inclination [degrees] 89.8 0.14 deg Rathcke et al. 2025
omega [degrees] 90.0 34.24 deg Rathcke et al. 2025
orbital period [days] 1.5108261 5.8e-06 day Rathcke et al. 2025
Rp 1.116 0.014 R_Earth Agol et al. 2021
Rp/Rs 0.0859 0 Agol et al. 2021
ephemeris [JD] 2460501.405464 1e-05 BJD-TDB Rathcke et al. 2025

Previously Published Mid-Transit Times

Value Uncertainty Units Reference
2457322.516401 0.00011766666666666668 BJD-TDB Ducrot et al. 2020, Gillon et al. 2017, Gillon et al. 2016
2457512.88646 0.0003 BJD de Wit et al. 2016
2458362.0021 0.0016 BJD-TDB Hirano et al. 2020
2460209.808352 0.00109332 BJD ExoFOP-TESS TOI
2460501.405464 1e-05 BJD-TDB Rathcke et al. 2025

Observations

Light curve chart for 0002164
Parameter Value Uncertainty
Am1 0.984 0.077
Am2 -0.0 0.17
a/Rs 21.17 0.27
Rp/Rs 0.167 0.049
ephemeris [JD] 2459907.63 0.012
eccentricity 0.0
inclination [degrees] 89.8
omega [degrees] 90.0
orbital period [days] 1.5108261
u0 0.612137511990683
u1 0.8664836279704544
u2 -0.6445313378095081
u3 0.16591020745263607
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
CBB Astrodon ExoPlanet-BB 500.0 nm 1000.0 nm
Organization Observer Code Secondary Observers
AAVSO LPAC (collaborate/publish)
Light curve chart for 0002176
Parameter Value Uncertainty
Am1 3.186 0.039
Am2 -1.0 0.33
a/Rs 20.54 0.28
Rp/Rs 0.138 0.048
ephemeris [JD] 2459909.152 0.012
eccentricity 0.0
inclination [degrees] 89.8
omega [degrees] 90.0
orbital period [days] 1.5108261
u0 1.028193352262385
u1 -1.6172872601683204
u2 2.274686489058904
u3 -0.6855925472574986
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
SR Sloan r 553.1 nm 693.1 nm
Organization Observer Code Secondary Observers
AAVSO LGEC (collaborate/publish)