results
GJ 1214 b


Total Reductions to Date: 8
Date Processed: 06/06/2025 at 07:00:04 (PDT)
Exoplanet Watch Ephemeris
Parameter | Value | Uncertainty |
---|---|---|
Orbital Period (Days) | 1.5804045000859988 | 3.4659324632060173e-09 |
Ephemeris (BJD_TDB) | 2460159.734340697 | 3.4695762202216036e-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 | 0.325 | 0.079 |
Am2 | 1.0 | 0.28 |
a/Rs | 15.346 | 0.056 |
Rp/Rs | 0.23 | 0.068 |
ephemeris [JD] | 2459402.74 | 0.011 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 1.1259251292599626 | |
u1 | -0.2922483629517725 | |
u2 | 0.26663326454301967 | |
u3 | -0.1003100268780645 | |
duration | 0.0398 | 0.0027 |
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 | 1.701 | 0.061 |
Am2 | -0.46 | 0.34 |
a/Rs | 15.176 | 0.059 |
Rp/Rs | 0.14 | 0.041 |
ephemeris [JD] | 2459710.92 | 0.012 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 1.6061134008782558 | |
u1 | -1.2094244801958518 | |
u2 | 0.8624932578828972 | |
u3 | -0.2591821657131501 | |
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 | 0.889 | 0.017 |
Am2 | 0.068 | 0.043 |
a/Rs | 15.274 | 0.058 |
Rp/Rs | 0.232 | 0.066 |
ephemeris [JD] | 2459726.6899 | 0.009 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 1.6041408859726696 | |
u1 | -1.2042708962231774 | |
u2 | 0.8577594127015193 | |
u3 | -0.2576293896694003 | |
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 | 1.034 | 0.01 |
Am2 | -0.0195 | 0.0075 |
a/Rs | 15.175 | 0.056 |
Rp/Rs | 0.122 | 0.024 |
ephemeris [JD] | 2460072.8171 | 0.0048 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 1.2556690412111777 | |
u1 | -0.33002576558890107 | |
u2 | 0.09034631688427686 | |
u3 | -0.015989591160288488 | |
duration | 0.03671 | 0.00084 |
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 | 1.0106 | 0.0016 |
Am2 | -0.0061 | 0.0063 |
a/Rs | 15.174 | 0.057 |
Rp/Rs | 0.1054 | 0.0053 |
ephemeris [JD] | 2460134.45166 | 0.0007 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 0.8373248696861209 | |
u1 | -0.11759745229515989 | |
u2 | 0.4947314769865585 | |
u3 | -0.21445888700544602 | |
duration | 0.03625 | 0.00023 |
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 | 1.033 | 0.015 |
Am2 | -0.029 | 0.051 |
a/Rs | 15.189 | 0.057 |
Rp/Rs | 0.112 | 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 | 0.8597319404963563 | |
u1 | -0.1952005661774565 | |
u2 | 0.5829993109961621 | |
u3 | -0.24753067662769512 | |
duration | 0.03641 | 0.00081 |
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 | 1.0232 | 0.0046 |
Am2 | -0.018 | 0.011 |
a/Rs | 15.368 | 0.058 |
Rp/Rs | 0.0965 | 0.0057 |
ephemeris [JD] | 2460140.76979 | 0.00072 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 0.8317279255469241 | |
u1 | -0.10696167199381836 | |
u2 | 0.48736027872706433 | |
u3 | -0.21212652501793605 | |
duration | 0.03544 | 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 | FTAC (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.0201 | 0.005 |
Am2 | -0.015 | 0.022 |
a/Rs | 15.36 | 0.057 |
Rp/Rs | 0.134 | 0.007 |
ephemeris [JD] | 2460159.73072 | 0.00058 |
eccentricity | 0.0 | |
inclination [degrees] | 89.32 | |
omega [degrees] | 90.0 | |
orbital period [days] | 1.580404341 | |
u0 | 0.8383634544329833 | |
u1 | -0.11838753873166163 | |
u2 | 0.4945047471070608 | |
u3 | -0.21448065543968753 | |
duration | 0.0366 | 0.0003 |
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) |