results
GJ 1214 b

Total Reductions to Date: 6
Date Processed: 09/18/2023 at 00:07:19 (PDT)
Exoplanet Watch Ephemeris
Parameter | Value | Uncertainty |
---|---|---|
Orbital Period (Days) | 1.580404676134895 | 5.1850097297294084e-08 |
Ephemeris (BJD_TDB) | 2460134.4483435694 | 0.00015521248174034713 |
Time saved (hours) | - |
Assumed Priors
Parameter | Value | Uncertainty | Units | Reference |
---|---|---|---|---|
RA | 258.8313991 | decimal | ||
DEC | 4.9606795 | decimal | ||
Host Star Metallicity | 0.29 | 0.12 | Cloutier et al. 2021 | |
Host Star log(g) | 4.99 | 0.03 | Log10(cgs) | Kokori et al. 2022 |
Host Star Radius [R_Sun] | 0.21 | 0.01 | Sol | Kokori et al. 2022 |
Host Star Effective Temperature [K] | 3026.0 | 130.0 | K | Kokori et al. 2022 |
a/Rs | 14.85 | 0.16 | Cloutier et al. 2021 | |
eccentricity | 0.063 | Cloutier et al. 2021 | ||
inclination [degrees] | 88.7 | 0.1 | deg | Cloutier et al. 2021 |
omega [degrees] | 0.0 | deg | Cáceres et al. 2014 | |
orbital period [days] | 1.58040454 | 4e-08 | day | Kokori et al. 2022 |
Rp | 2.746 | 0.045 | R_Earth | Cloutier et al. 2021 |
Rp/Rs | 0.1199 | 0 | Kokori et al. 2022 | |
ephemeris [JD] | 2455881.57931 | 2.2e-05 | BJD-TDB | Kokori et al. 2022 |
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 |
2454980.748864 | 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 |
2455881.57931 | 2.2e-05 | BJD-TDB | Kokori et al. 2022 |
Observations

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.33 | 0.08 |
Am2 | 0.99 | 0.27 |
a/Rs | 14.23 | 0.46 |
Rp/Rs | 0.237 | 0.071 |
ephemeris [JD] | 2459402.74 | 0.011 |
eccentricity | 0.063 | |
inclination [degrees] | 88.7 | |
omega [degrees] | 0.0 | |
orbital period [days] | 1.58040454 | |
u0 | 0.985018626537732 | |
u1 | 0.12709105909743276 | |
u2 | -0.16375873282476183 | |
u3 | 0.05164904962979236 | |
duration | 0.0418 | 0.0034 |
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 | 1.711 | 0.061 |
Am2 | -0.46 | 0.34 |
a/Rs | 14.14 | 0.47 |
Rp/Rs | 0.134 | 0.039 |
ephemeris [JD] | 2459710.92 | 0.012 |
eccentricity | 0.063 | |
inclination [degrees] | 88.7 | |
omega [degrees] | 0.0 | |
orbital period [days] | 1.58040454 | |
u0 | 1.4993512194174279 | |
u1 | -0.9001603731481018 | |
u2 | 0.5534751259892668 | |
u3 | -0.15266596401117083 | |
duration | 0.0385 | 0.0024 |
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 | 0.873 | 0.017 |
Am2 | 0.079 | 0.045 |
a/Rs | 14.35 | 0.45 |
Rp/Rs | 0.238 | 0.068 |
ephemeris [JD] | 2459726.6901 | 0.0087 |
eccentricity | 0.063 | |
inclination [degrees] | 88.7 | |
omega [degrees] | 0.0 | |
orbital period [days] | 1.58040454 | |
u0 | 1.4993869911316824 | |
u1 | -0.9000506826352336 | |
u2 | 0.5532349005446568 | |
u3 | -0.15257120079726316 | |
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 | -0.0178 | 0.008 |
a/Rs | 14.4 | 0.47 |
Rp/Rs | 0.125 | 0.025 |
ephemeris [JD] | 2460072.8169 | 0.0049 |
eccentricity | 0.063 | |
inclination [degrees] | 88.7 | |
omega [degrees] | 0.0 | |
orbital period [days] | 1.58040454 | |
u0 | 1.1300161958582948 | |
u1 | 0.02662067870153761 | |
u2 | -0.2609632896991019 | |
u3 | 0.10432641902792544 | |
duration | 0.0376 | 0.0016 |
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 | 1.0126 | 0.0016 |
Am2 | -0.0074 | 0.005 |
a/Rs | 14.06 | 0.28 |
Rp/Rs | 0.1065 | 0.0041 |
ephemeris [JD] | 2460134.45135 | 0.00056 |
eccentricity | 0.063 | |
inclination [degrees] | 88.7 | |
omega [degrees] | 0.0 | |
orbital period [days] | 1.58040454 | |
u0 | 0.7720028486551083 | |
u1 | 0.061850234014005745 | |
u2 | 0.31984314872805386 | |
u3 | -0.15369622663113353 | |
duration | 0.03787 | 0.00084 |
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 | 1.063 | 0.016 |
Am2 | -0.051 | 0.051 |
a/Rs | 14.06 | 0.46 |
Rp/Rs | 0.113 | 0.023 |
ephemeris [JD] | 2460140.7747 | 0.0042 |
eccentricity | 0.063 | |
inclination [degrees] | 88.7 | |
omega [degrees] | 0.0 | |
orbital period [days] | 1.58040454 | |
u0 | 0.7696357265492921 | |
u1 | 0.07140418723778963 | |
u2 | 0.3081925109822118 | |
u3 | -0.14923242017686728 | |
duration | 0.0381 | 0.0016 |
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) |