results
HAT-P-18 b


Total Reductions to Date: 16
Date Processed: 09/18/2023 at 00:07:19 (PDT)
Exoplanet Watch Ephemeris
Parameter | Value | Uncertainty |
---|---|---|
Orbital Period (Days) | 5.50802961008147 | 1.6747224582127454e-07 |
Ephemeris (BJD_TDB) | 2460090.8592578867 | 2.7398115695541635e-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 | 0.15 | Bonomo et al. 2017 | |
inclination [degrees] | 88.66 | 0.03 | deg | Fu et al. 2022 |
omega [degrees] | 12.0 | 22.0 | deg | Knutson 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 | 0.994 | 0.023 |
Am2 | 0.0056 | 0.0064 |
a/Rs | 16.55 | 0.17 |
Rp/Rs | 0.097 | 0.037 |
ephemeris [JD] | 2456697.914 | 0.01 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 1.395705297031266 | |
u1 | -2.4052435552403773 | |
u2 | 3.1034081401485762 | |
u3 | -1.09386983569508 | |
duration | 0.0807 | 0.01 |
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 | 1.011 | 0.015 |
Am2 | -0.01 | 0.061 |
a/Rs | 16.22 | 0.17 |
Rp/Rs | 0.138 | 0.022 |
ephemeris [JD] | 2458658.7738 | 0.0033 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 1.7105090972621042 | |
u1 | -2.972186574500691 | |
u2 | 3.4752376150694735 | |
u3 | -1.2135600860458111 | |
duration | 0.1141 | 0.0028 |
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 | 0.234 | 0.0012 |
Am2 | 0.1 | 0.027 |
a/Rs | 16.54 | 0.17 |
Rp/Rs | 0.119 | 0.0074 |
ephemeris [JD] | 2458983.7446 | 0.0017 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 1.71027810922536 | |
u1 | -2.9710620272504698 | |
u2 | 3.4736751168689084 | |
u3 | -1.2128911470820056 | |
duration | 0.1094 | 0.0015 |
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 | SGEO (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.992 | 0.014 |
Am2 | 0.0089 | 0.0062 |
a/Rs | 16.22 | 0.17 |
Rp/Rs | 0.128 | 0.012 |
ephemeris [JD] | 2459038.8276 | 0.0037 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 1.7104391501890999 | |
u1 | -2.972018051405068 | |
u2 | 3.4751227194777417 | |
u3 | -1.2135437664784097 | |
duration | 0.1129 | 0.0019 |
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 | 1.005 | 0.021 |
Am2 | -0.0033 | 0.0055 |
a/Rs | 16.79 | 0.17 |
Rp/Rs | 0.119 | 0.025 |
ephemeris [JD] | 2459765.8828 | 0.0091 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 1.7104240521870975 | |
u1 | -2.9709297990769534 | |
u2 | 3.4733145221731023 | |
u3 | -1.2128087235268268 | |
duration | 0.1076 | 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 | 1.014 | 0.073 |
Am2 | -0.0101 | 0.0033 |
a/Rs | 16.81 | 0.17 |
Rp/Rs | 0.1544 | 0.0074 |
ephemeris [JD] | 2460046.8029 | 0.0026 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 1.7093915754709872 | |
u1 | -2.968333303540387 | |
u2 | 3.4701766492771022 | |
u3 | -1.2112348694980408 | |
duration | 0.1114 | 0.0015 |
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 | PMIF (collaborate/publish) | UNIS |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.0037 | 0.0037 |
Am2 | -0.004 | 0.04 |
a/Rs | 16.25 | 0.17 |
Rp/Rs | 0.134 | 0.012 |
ephemeris [JD] | 2460090.8603 | 0.0018 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 1.7103025168173795 | |
u1 | -2.9711381939613215 | |
u2 | 3.4738687426935364 | |
u3 | -1.2130330137849166 | |
duration | 0.1132 | 0.002 |
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) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.9998 | 0.0034 |
Am2 | 0 | |
a/Rs | 16.31 | 0.15 |
Rp/Rs | 0.131 | 0.0021 |
ephemeris [JD] | 2458989.25277 | 0.00088 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 2.2011276649659797 | |
u1 | -3.7507786289495813 | |
u2 | 3.8990201453839344 | |
u3 | -1.3493691233004048 | |
duration | 0.1126 | 0.0012 |
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 |
---|---|---|
EPW | TESS (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.0001 | 0.003 |
Am2 | 0 | |
a/Rs | 16.35 | 0.15 |
Rp/Rs | 0.1358 | 0.0018 |
ephemeris [JD] | 2459011.28586 | 0.00075 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 2.196851939658582 | |
u1 | -3.7356405322056414 | |
u2 | 3.8814879105353244 | |
u3 | -1.3426992601495882 | |
duration | 0.1126 | 0.0012 |
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 |
---|---|---|
EPW | TESS (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.9998 | 0.0033 |
Am2 | 0 | |
a/Rs | 16.61 | 0.17 |
Rp/Rs | 0.134 | 0.086 |
ephemeris [JD] | 2459016.78 | 0.012 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 2.20111234487897 | |
u1 | -3.7505675498221875 | |
u2 | 3.8986836839004075 | |
u3 | -1.3492284208622762 | |
duration | 0 | 0 |
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 |
---|---|---|
EPW | TESS (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.9999 | 0.0032 |
Am2 | 0 | |
a/Rs | 16.31 | 0.15 |
Rp/Rs | 0.1341 | 0.0019 |
ephemeris [JD] | 2459027.80949 | 0.00083 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 2.201152765229039 | |
u1 | -3.7510424892721823 | |
u2 | 3.899429510420037 | |
u3 | -1.3495397282708654 | |
duration | 0.113 | 0.0012 |
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 |
---|---|---|
EPW | TESS (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.0007 | 0.0033 |
Am2 | 0 | |
a/Rs | 16.42 | 0.16 |
Rp/Rs | 0.1352 | 0.002 |
ephemeris [JD] | 2459016.79237 | 0.00082 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 2.201459142085972 | |
u1 | -3.751620557391934 | |
u2 | 3.8998927289665777 | |
u3 | -1.3497312555476855 | |
duration | 0.1124 | 0.0013 |
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 |
---|---|---|
EPW | TESS (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.0002 | 0.003 |
Am2 | 0 | |
a/Rs | 16.77 | 0.15 |
Rp/Rs | 0.1375 | 0.0026 |
ephemeris [JD] | 2458983.74532 | 0.00092 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 2.2015985597942445 | |
u1 | -3.752581177197003 | |
u2 | 3.9013205399783963 | |
u3 | -1.3503378644414314 | |
duration | 0.1099 | 0.0011 |
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 |
---|---|---|
EPW | TESS (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.0001 | 0.0026 |
Am2 | 0 | |
a/Rs | 16.42 | 0.16 |
Rp/Rs | 0.1345 | 0.0018 |
ephemeris [JD] | 2459005.77786 | 0.00071 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 2.1971982759036863 | |
u1 | -3.7368478518411568 | |
u2 | 3.8829739974983055 | |
u3 | -1.3433243637000136 | |
duration | 0.112 | 0.0013 |
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 |
---|---|---|
EPW | TESS (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.9999 | 0.0032 |
Am2 | 0 | |
a/Rs | 16.22 | 0.14 |
Rp/Rs | 0.1327 | 0.002 |
ephemeris [JD] | 2459033.31873 | 0.00079 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 2.196888568701111 | |
u1 | -3.7359452427653688 | |
u2 | 3.881992351734062 | |
u3 | -1.3429356198236104 | |
duration | 0.1133 | 0.0012 |
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 |
---|---|---|
EPW | TESS (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.9999 | 0.0027 |
Am2 | 0 | |
a/Rs | 16.22 | 0.14 |
Rp/Rs | 0.1374 | 0.0018 |
ephemeris [JD] | 2458994.76048 | 0.00078 |
eccentricity | 0.087 | |
inclination [degrees] | 88.66 | |
omega [degrees] | 12.0 | |
orbital period [days] | 5.5080232 | |
u0 | 2.1973745635298303 | |
u1 | -3.73772499118412 | |
u2 | 3.884213602054239 | |
u3 | -1.343863116520656 | |
duration | 0.1137 | 0.0012 |
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 |
---|---|---|
EPW | TESS (collaborate/publish) |