results
GJ 1214 b


Total Reductions to Date: 8
Date Processed: 05/30/2025 at 07:00:33 (PDT)
Exoplanet Watch Ephemeris
Parameter | Value | Uncertainty |
---|---|---|
Orbital Period (Days) | 1.580404500094126 | 3.538538005578388e-09 |
Ephemeris (BJD_TDB) | 2460159.734340699 | 3.456369132043805e-06 |
Assumed Priors
Parameter | Value | Uncertainty | Units | Reference |
---|---|---|---|---|
RA | 258.8313991 | decimal | ||
DEC | 4.9606795 | decimal | ||
Host Star Metallicity | 0.24 | 0.11 | Mahajan et al. 2024 | |
Host Star log(g) | 5.0286 | 0.0078 | Log10(cgs) | Mahajan et al. 2024 |
Host Star Radius [R_Sun] | 0.2162 | 0.0025 | Sol | Mahajan et al. 2024 |
Host Star Effective Temperature [K] | 3026.0 | 130.0 | K | Yalçınkaya et al. 2024 |
a/Rs | 15.27 | 0.02 | Schlawin et al. 2024 | |
eccentricity | 0.0 | 0.0079 | Schlawin et al. 2024 | |
inclination [degrees] | 89.32 | 0.03 | deg | Schlawin et al. 2024 |
omega [degrees] | 90.0 | 7.5 | deg | Schlawin et al. 2024 |
orbital period [days] | 1.580404341 | 7.9e-08 | day | Schlawin et al. 2024 |
Rp | 2.733 | 0.033 | R_Earth | Mahajan et al. 2024 |
Rp/Rs | 0.1159 | 0 | Mahajan et al. 2024 | |
ephemeris [JD] | 2460143.93029503 | 3.58e-06 | BJD-TDB | Schlawin et al. 2024 |
Previously Published Mid-Transit Times
Value | Uncertainty | Units | Reference |
---|---|---|---|
2454934.916934 | 2.7e-05 | BJD | Cáceres et al. 2014 |
2454964.944054 | 0.0002315 | HJD, UTC-BJD | Sada et al. 2010, Charbonneau et al. 2009 |
2454980.748863667 | 6.333333333333333e-05 | BJD-TDB | Gillon et al. 2014, Carter et al. 2011, Carter et al. 2011 |
2455320.535733 | 2.1e-05 | BJD-TDB | Harpsøe et al. 2013 |
2455701.413328 | 6.6e-05 | BJD | Cloutier et al. 2021 |
2455799.398485 | 1.9e-05 | BJD-TDB | Yalçınkaya et al. 2024 |
2455881.57931 | 2.2e-05 | BJD-TDB | Kokori et al. 2022 |
2455886.320526 | 2.3e-05 | BJD-TDB | Kokori et al. 2023 |
2459639.7812619 | 9e-06 | BJD-TDB | Mahajan et al. 2024 |
2460143.93029503 | 3.58e-06 | BJD-TDB | Schlawin et al. 2024 |
Observations

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.332 | 0.081 |
Am2 | 0.99 | 0.29 |
a/Rs | 15.302 | 0.058 |
Rp/Rs | 0.23 | 0.066 |
ephemeris [JD] | 2459402.74 | 0.01 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 1.121339118792635 | |
u1 | -0.2818435003710781 | |
u2 | 0.25827021396852823 | |
u3 | -0.09776582854155902 | |
duration | 0.0398 | 0.0024 |
Not included in ephemeris calculations
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter | Detail | Min | Max |
---|---|---|---|
CV | Clear (unfiltered) reduced to V sequence | 350.0 nm | 850.0 nm |
Organization | Observer Code | Secondary Observers |
---|---|---|
AAVSO | LPAC (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.593 | 0.057 |
Am2 | -0.4 | 0.35 |
a/Rs | 15.184 | 0.059 |
Rp/Rs | 0.143 | 0.037 |
ephemeris [JD] | 2459710.92 | 0.012 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 1.6020333509192557 | |
u1 | -1.1994798840662335 | |
u2 | 0.8539207288706983 | |
u3 | -0.25647418299931 | |
duration | 0.0372 | 0.0019 |
Not included in ephemeris calculations
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) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.885 | 0.017 |
Am2 | 0.069 | 0.044 |
a/Rs | 15.318 | 0.057 |
Rp/Rs | 0.231 | 0.067 |
ephemeris [JD] | 2459726.6901 | 0.0089 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 1.6049676748513193 | |
u1 | -1.2064790693865286 | |
u2 | 0.8598209391606487 | |
u3 | -0.258309531813109 | |
duration | 0 | 0 |
Not included in ephemeris calculations
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) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.0318 | 0.01 |
Am2 | -0.0179 | 0.0078 |
a/Rs | 15.181 | 0.057 |
Rp/Rs | 0.121 | 0.024 |
ephemeris [JD] | 2460072.817 | 0.0049 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 1.2625018534197587 | |
u1 | -0.3499291553719476 | |
u2 | 0.11062075861791024 | |
u3 | -0.023193455017343642 | |
duration | 0.03671 | 0.00079 |
Not included in ephemeris calculations
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) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.0109 | 0.0016 |
Am2 | -0.0065 | 0.0064 |
a/Rs | 15.177 | 0.058 |
Rp/Rs | 0.1055 | 0.0053 |
ephemeris [JD] | 2460134.45168 | 0.00071 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 0.8580336544474886 | |
u1 | -0.18906384313301605 | |
u2 | 0.5762732407071796 | |
u3 | -0.24524304343451164 | |
duration | 0.03614 | 0.00024 |
Included in ephemeris calculations
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter | Detail | Min | Max |
---|---|---|---|
R | Cousins R | 561.7 nm | 719.7 nm |
Organization | Observer Code | Secondary Observers |
---|---|---|
AAVSO | PJEF (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.043 | 0.015 |
Am2 | -0.036 | 0.052 |
a/Rs | 15.173 | 0.058 |
Rp/Rs | 0.11 | 0.023 |
ephemeris [JD] | 2460140.7755 | 0.0041 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 0.8604924316058284 | |
u1 | -0.19712208731451464 | |
u2 | 0.5845188673926812 | |
u3 | -0.2478892029739851 | |
duration | 0.03641 | 0.00082 |
Not included in ephemeris calculations
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter | Detail | Min | Max |
---|---|---|---|
R | Cousins R | 561.7 nm | 719.7 nm |
Organization | Observer Code | Secondary Observers |
---|---|---|
AAVSO | CCHD (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.0236 | 0.0046 |
Am2 | -0.019 | 0.011 |
a/Rs | 15.367 | 0.057 |
Rp/Rs | 0.0956 | 0.0055 |
ephemeris [JD] | 2460140.76979 | 0.00069 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 0.8345468976214033 | |
u1 | -0.11324068744181848 | |
u2 | 0.4925774261878085 | |
u3 | -0.2138836290274177 | |
duration | 0.03536 | 0.00022 |
Included in ephemeris calculations
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter | Detail | Min | Max |
---|---|---|---|
R | Cousins R | 561.7 nm | 719.7 nm |
Organization | Observer Code | Secondary Observers |
---|---|---|
AAVSO | FTAC (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.0221 | 0.0051 |
Am2 | -0.016 | 0.022 |
a/Rs | 15.351 | 0.058 |
Rp/Rs | 0.1337 | 0.0071 |
ephemeris [JD] | 2460159.73071 | 0.00056 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 0.8404675809522957 | |
u1 | -0.12129024881246894 | |
u2 | 0.4953509874469895 | |
u3 | -0.21452831220551133 | |
duration | 0.03666 | 0.00032 |
Included in ephemeris calculations
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter | Detail | Min | Max |
---|---|---|---|
R | Cousins R | 561.7 nm | 719.7 nm |
Organization | Observer Code | Secondary Observers |
---|---|---|
AAVSO | FTAC (collaborate/publish) |