results
HAT-P-18 b

Total Reductions to Date: 6
Date Processed: 06/03/2023 at 06:50:22 (PDT)
Exoplanet Watch Ephemeris
Parameter | Value | Uncertainty |
---|---|---|
Orbital Period (Days) | 5.508029608846454 | 1.6647197204624815e-07 |
Ephemeris (BJD_TDB) | 2460090.859257077 | 2.711883939927771e-05 |
Time saved (hours) | 0.0003 |
Assumed Priors
Parameter | Value | Uncertainty | Units | Reference |
---|---|---|---|---|
RA | 256.346376 | decimal | ||
DEC | 33.0123251 | decimal | ||
Host Star Metallicity | 0.1 | 0.08 | Patel & Espinoza 2022 | |
Host Star log(g) | 4.57 | 0.04 | Log10(cgs) | Patel & Espinoza 2022 |
Host Star Radius [R_Sun] | 0.75 | 0.04 | Sol | Patel & Espinoza 2022 |
Host Star Effective Temperature [K] | 4803.0 | 80.0 | K | Patel & Espinoza 2022 |
a/Rs | 16.52 | 0.06 | Fu et al. 2022 | |
eccentricity | 0.087 | 0.03 | Bonomo et al. 2017 | |
inclination [degrees] | 88.66 | 0.03 | deg | Fu et al. 2022 |
omega [degrees] | 104.0 | 50.0 | deg | Esposito et al. 2014 |
orbital period [days] | 5.5080232 | 5.6e-06 | day | Patel & Espinoza 2022 |
Rp | 10.73 | 0.74 | R_Earth | ExoFOP-TESS TOI |
Rp/Rs | 0.1469 | 0 | ExoFOP-TESS TOI | |
ephemeris [JD] | 2459743.853395 | 2.3e-05 | BJD-TDB | Fu et al. 2022 |
Previously Published Mid-Transit Times
Value | Uncertainty | Units | Reference |
---|---|---|---|
2454715.022256667 | 0.00026333333333333336 | BJD-TDB, BJD-UTC | Bonomo et al. 2017, Seeliger et al. 2015, Hartman et al. 2011 |
2456411.49556 | 0.00053 | BJD-TDB | Ivshina & Winn 2022 |
2457276.25646 | 0.0001 | BJD-TDB | Kokori et al. 2022 |
2457507.592196 | 0.000194 | BJD | Kirk et al. 2017 |
2458983.744992 | 0.000385 | BJD | ExoFOP-TESS TOI |
2459033.31735 | 0.00021 | BJD | Patel & Espinoza 2022 |
2459743.853395 | 2.3e-05 | BJD-TDB | Fu et al. 2022 |
Observations

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.995 | 0.023 |
Am2 | 0.0053 | 0.0062 |
a/Rs | 16.35 | 0.17 |
Rp/Rs | 0.095 | 0.036 |
ephemeris [JD] | 2456697.916 | 0.011 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 104.0 | |
orbital period [days] | 5.5080232 | |
u0 | 1.3954280896164044 | |
u1 | -2.4044808547189565 | |
u2 | 3.102329301534782 | |
u3 | -1.09327653643223 | |
duration | 0.079 | 0.011 |
Not included in ephemeris calculations
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter | Detail | Min | Max |
---|---|---|---|
V | Johnson V | 502.8 nm | 586.8 nm |
Organization | Observer Code | Secondary Observers |
---|---|---|
AAVSO | SPUA (collaborate/publish) | MOBS |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.982 | 0.014 |
Am2 | 0.015 | 0.058 |
a/Rs | 16.23 | 0.17 |
Rp/Rs | 0.13 | 0.023 |
ephemeris [JD] | 2458658.7739 | 0.0037 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 104.0 | |
orbital period [days] | 5.5080232 | |
u0 | 1.7099154857411762 | |
u1 | -2.9705907818171005 | |
u2 | 3.473301343312486 | |
u3 | -1.212626047236562 | |
duration | 0.1068 | 0.0027 |
Not included in ephemeris calculations
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter | Detail | Min | Max |
---|---|---|---|
CV | MObs CV | 350.0 nm | 850.0 nm |
Organization | Observer Code | Secondary Observers |
---|---|---|
AAVSO | FMAA (collaborate/publish) | MOBS |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.2331 | 0.0012 |
Am2 | 0.104 | 0.019 |
a/Rs | 16.22 | 0.15 |
Rp/Rs | 0.1177 | 0.0056 |
ephemeris [JD] | 2458983.7442 | 0.0015 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 104.0 | |
orbital period [days] | 5.5080232 | |
u0 | 1.7101786595514823 | |
u1 | -2.9715738681473334 | |
u2 | 3.4746290247772817 | |
u3 | -1.2132338161814307 | |
duration | 0.1055 | 0.0012 |
Included in ephemeris calculations
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter | Detail | Min | Max |
---|---|---|---|
CV | MObs CV | 350.0 nm | 850.0 nm |
Organization | Observer Code | Secondary Observers |
---|---|---|
AAVSO | SGEO (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.988 | 0.014 |
Am2 | 0.0111 | 0.0063 |
a/Rs | 16.23 | 0.17 |
Rp/Rs | 0.123 | 0.012 |
ephemeris [JD] | 2459038.8264 | 0.0046 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 104.0 | |
orbital period [days] | 5.5080232 | |
u0 | 1.7101983714137599 | |
u1 | -2.9709925419975454 | |
u2 | 3.473769827828074 | |
u3 | -1.2129756572442885 | |
duration | 0.1062 | 0.0018 |
Included in ephemeris calculations
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter | Detail | Min | Max |
---|---|---|---|
CV | MObs CV | 350.0 nm | 850.0 nm |
Organization | Observer Code | Secondary Observers |
---|---|---|
AAVSO | FMAA (collaborate/publish) | MOBS |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.003 | 0.022 |
Am2 | -0.0015 | 0.0056 |
a/Rs | 16.77 | 0.17 |
Rp/Rs | 0.122 | 0.027 |
ephemeris [JD] | 2459765.8826 | 0.0072 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 104.0 | |
orbital period [days] | 5.5080232 | |
u0 | 1.7101697875059412 | |
u1 | -2.971032755113995 | |
u2 | 3.473655753840144 | |
u3 | -1.2127927862320904 | |
duration | 0.102 | 0.003 |
Not included in ephemeris calculations
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter | Detail | Min | Max |
---|---|---|---|
CV | MObs CV | 350.0 nm | 850.0 nm |
Organization | Observer Code | Secondary Observers |
---|---|---|
AAVSO | FMAA (collaborate/publish) | MOBS |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.9753 | 0.0036 |
Am2 | 0.022 | 0.035 |
a/Rs | 16.23 | 0.17 |
Rp/Rs | 0.126 | 0.012 |
ephemeris [JD] | 2460090.861 | 0.0021 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 104.0 | |
orbital period [days] | 5.5080232 | |
u0 | 1.7103487441702554 | |
u1 | -2.9714193076690734 | |
u2 | 3.474230040216403 | |
u3 | -1.213159476717585 | |
duration | 0.1063 | 0.0017 |
Included in ephemeris calculations
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter | Detail | Min | Max |
---|---|---|---|
CV | MObs CV | 350.0 nm | 850.0 nm |
Organization | Observer Code | Secondary Observers |
---|---|---|
AAVSO | MBEB (collaborate/publish) |