results
GJ 436 b
Total Reductions to Date: 4
Date Processed: 09/06/2025 at 07:00:04 (PDT)
Exoplanet Watch Ephemeris
| Parameter | Value | Uncertainty |
|---|---|---|
| Orbital Period (Days) | 2.6438982507131743 | 7.993571231500309e-08 |
| Ephemeris (BJD_TDB) | 2460089.426794819 | 0.00016235368113561065 |
| Time saved (hours) | - |
Assumed Priors
| Parameter | Value | Uncertainty | Units | Reference |
|---|---|---|---|---|
| RA | 175.5505363 | decimal | ||
| DEC | 26.7030669 | decimal | ||
| Host Star Metallicity | -0.03 | 0.2 | Kokori et al. 2023 | |
| Host Star log(g) | 4.843 | 0.018 | Log10(cgs) | Kokori et al. 2023 |
| Host Star Radius [R_Sun] | 0.464 | 0.009 | Sol | Kokori et al. 2023 |
| Host Star Effective Temperature [K] | 3350.0 | 300.0 | K | Kokori et al. 2023 |
| a/Rs | 14.6 | 0.1 | Mukherjee et al. 2025 | |
| eccentricity | 0.1634 | 0.0027 | Mukherjee et al. 2025 | |
| inclination [degrees] | 86.87 | 0.04 | deg | Mukherjee et al. 2025 |
| omega [degrees] | 327.31 | 1.54 | deg | Mukherjee et al. 2025 |
| orbital period [days] | 2.64389753 | 1.2e-07 | day | Mukherjee et al. 2025 |
| Rp | 3.81 | 0.12 | R_Earth | ExoFOP-TESS TOI |
| Rp/Rs | 0.0826 | 0 | Bourrier et al. 2018 | |
| ephemeris [JD] | 2454873.015821 | 4.1e-05 | BJD-TDB | Mukherjee et al. 2025 |
Previously Published Mid-Transit Times
| Value | Uncertainty | Units | Reference |
|---|---|---|---|
| 2454222.61588 | 0.00012 | HJD | Caceres et al. 2009 |
| 2454235.8355 | 0.0001 | HJD | Shporer et al. 2009 |
| 2454238.479958 | 3.9e-05 | BJD | Turner et al. 2016 |
| 2454428.848 | 0.029 | BJD | Rosenthal et al. 2021 |
| 2454449.99141 | 8e-05 | HJD | Pont et al. 2009 |
| 2454510.80162 | 7e-05 | BJD-TDB | Maciejewski et al. 2014 |
| 2454865.0837586666 | 3.733333333333333e-05 | BJD, BJD-TT | Bourrier et al. 2018, Lanotte et al. 2014, Knutson et al. 2011 |
| 2454873.0158205 | 4.05e-05 | BJD-TDB | Mukherjee et al. 2025, Kokori et al. 2022 |
| 2455280.17568 | 0.00017 | BJD-TDB | Baluev et al. 2015 |
| 2455290.751684 | 5.2e-05 | BJD-TDB | Kokori et al. 2023 |
| 2459639.963332 | 0.00018953 | BJD | ExoFOP-TESS TOI |
Observations
| Parameter | Value | Uncertainty |
|---|---|---|
| Am1 | 1.0188 | 0.0051 |
| Am2 | -0.016 | 0.011 |
| a/Rs | 14.11 | 0.3 |
| Rp/Rs | 0.0862 | 0.0086 |
| ephemeris [JD] | 2459663.7666 | 0.0027 |
| eccentricity | 0.1634 | |
| inclination [degrees] | 86.87 | |
| omega [degrees] | 327.31 | |
| orbital period [days] | 2.64389753 | |
| u0 | 1.4566728525819457 | |
| u1 | -1.0961569617458868 | |
| u2 | 0.9630468808649023 | |
| u3 | -0.32356275735044426 | |
| duration | 0.0458 | 0.0025 |
Included in ephemeris calculations
Light Curve (
PNG, PDF - high resolution
)
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
| Filter | Detail | Min | Max |
|---|---|---|---|
| RJ | Johnson R | 590.0 nm | 810.0 nm |
| Organization | Observer Code | Secondary Observers |
|---|---|---|
| AAVSO | MBEB (collaborate/publish) |
| Parameter | Value | Uncertainty |
|---|---|---|
| Am1 | 0.9727 | 0.0029 |
| Am2 | 0.0242 | 0.0057 |
| a/Rs | 14.7 | 0.23 |
| Rp/Rs | 0.0903 | 0.0051 |
| ephemeris [JD] | 2459671.6885 | 0.0011 |
| eccentricity | 0.1634 | |
| inclination [degrees] | 86.87 | |
| omega [degrees] | 327.31 | |
| orbital period [days] | 2.64389753 | |
| u0 | 1.93907396750978 | |
| u1 | -2.0895892110148666 | |
| u2 | 1.677436587683803 | |
| u3 | -0.5269213191829634 | |
| duration | 0.0417 | 0.0017 |
Included in ephemeris calculations
Light Curve (
PNG, PDF - high resolution
)
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
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) |
| Parameter | Value | Uncertainty |
|---|---|---|
| Am1 | 0.9909 | 0.0018 |
| Am2 | 0.0087 | 0.0042 |
| a/Rs | 14.1 | 0.14 |
| Rp/Rs | 0.0804 | 0.0032 |
| ephemeris [JD] | 2460044.47979 | 0.00082 |
| eccentricity | 0.1634 | |
| inclination [degrees] | 86.87 | |
| omega [degrees] | 327.31 | |
| orbital period [days] | 2.64389753 | |
| u0 | 1.0489916785045172 | |
| u1 | -0.572504207415767 | |
| u2 | 0.868359230522544 | |
| u3 | -0.3448466886717334 | |
| duration | 0.0454 | 0.0011 |
Included in ephemeris calculations
Light Curve (
PNG, PDF - high resolution
)
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
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 | SAJB (collaborate/publish) |
| Parameter | Value | Uncertainty |
|---|---|---|
| Am1 | 0.9739 | 0.0048 |
| Am2 | 0.0147 | 0.0011 |
| a/Rs | 15.08 | 0.28 |
| Rp/Rs | 0.1005 | 0.0057 |
| ephemeris [JD] | 2460089.4235 | 0.0014 |
| eccentricity | 0.1634 | |
| inclination [degrees] | 86.87 | |
| omega [degrees] | 327.31 | |
| orbital period [days] | 2.64389753 | |
| u0 | 1.1407554625851108 | |
| u1 | -0.7366636978509713 | |
| u2 | 0.9674266133108674 | |
| u3 | -0.3715183636292271 | |
| duration | 0.04 | 0.0021 |
Included in ephemeris calculations
Light Curve (
PNG, PDF - high resolution
)
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
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 | KADB (collaborate/publish) | PERC |