results
HAT-P-53 b


Total Reductions to Date: 8
Date Processed: 05/30/2025 at 07:00:33 (PDT)
Exoplanet Watch Ephemeris
Parameter | Value | Uncertainty |
---|---|---|
Orbital Period (Days) | 1.9616248714609836 | 3.310705484054182e-07 |
Ephemeris (BJD_TDB) | 2460252.9126313636 | 0.0004407193707534507 |
Assumed Priors
Parameter | Value | Uncertainty | Units | Reference |
---|---|---|---|---|
RA | 21.8711012 | decimal | ||
DEC | 38.9681137 | decimal | ||
Host Star Metallicity | 0.0 | 0.08 | Kokori et al. 2023 | |
Host Star log(g) | 4.31 | 0.043 | Log10(cgs) | Kokori et al. 2023 |
Host Star Radius [R_Sun] | 1.209 | 0.081 | Sol | Kokori et al. 2023 |
Host Star Effective Temperature [K] | 5956.0 | 50.0 | K | Yalçınkaya et al. 2024 |
a/Rs | 5.6 | 0.3 | Kokori et al. 2023 | |
eccentricity | 0.085 | Bonomo et al. 2017 | ||
inclination [degrees] | 86.2 | 1.5 | deg | Kokori et al. 2023 |
omega [degrees] | 0.0 | deg | Yalçınkaya et al. 2024 | |
orbital period [days] | 1.96162529 | 3.5e-07 | day | Yalçınkaya et al. 2024 |
Rp | 12.9 | 1.02 | R_Earth | ExoFOP-TESS TOI |
Rp/Rs | 0.1172 | 0 | ExoFOP-TESS TOI | |
ephemeris [JD] | 2458771.88605 | 0.00028 | BJD-TDB | Yalçınkaya et al. 2024 |
Previously Published Mid-Transit Times
Value | Uncertainty | Units | Reference |
---|---|---|---|
2455829.4481929997 | 0.00044 | BJD-TDB, BJD-UTC | Bonomo et al. 2017, Hartman et al. 2015 |
2457502.7149 | 0.0003 | BJD-TDB | Kokori et al. 2022 |
2457898.96242 | 0.00039 | BJD-TDB | Kokori et al. 2023 |
2458771.88605 | 0.00028 | BJD-TDB | Yalçınkaya et al. 2024 |
2458785.619295 | 0.0015216 | BJD | ExoFOP-TESS TOI |
Observations

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.9994 | 0.0057 |
Am2 | 0.0016 | 0.0031 |
a/Rs | 5.39 | 0.14 |
Rp/Rs | 0.1346 | 0.0051 |
ephemeris [JD] | 2459434.9123 | 0.0015 |
eccentricity | 0.085 | |
inclination [degrees] | 86.2 | |
omega [degrees] | 0.0 | |
orbital period [days] | 1.96162529 | |
u0 | 2.638205075934742 | |
u1 | -4.720742145904303 | |
u2 | 4.744276661807774 | |
u3 | -1.661739521142981 | |
duration | 0.1255 | 0.0037 |
Included in ephemeris calculations
Posteriors ( PNG, PDF - high resolution )
Observation Data ( JSON )
Filter | Detail | Min | Max |
---|---|---|---|
SI | Sloan i | 697.5 nm | 827.5 nm |
Organization | Observer Code | Secondary Observers |
---|---|---|
AAVSO | LNWA (collaborate/publish) | BPAG |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.674 | 0.052 |
Am2 | -0.537 | 0.059 |
a/Rs | 7.07 | 0.24 |
Rp/Rs | 0.2343 | 0.0053 |
ephemeris [JD] | 2459550.6495 | 0.0037 |
eccentricity | 0.085 | |
inclination [degrees] | 86.2 | |
omega [degrees] | 0.0 | |
orbital period [days] | 1.96162529 | |
u0 | 2.4779402670284325 | |
u1 | -4.453297148841499 | |
u2 | 4.624250095400591 | |
u3 | -1.6488931446808293 | |
duration | 0.1014 | 0.0042 |
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 | 0.8674 | 0.0061 |
Am2 | 0.136 | 0.055 |
a/Rs | 5.15 | 0.29 |
Rp/Rs | 0.1615 | 0.0074 |
ephemeris [JD] | 2459846.8414 | 0.0037 |
eccentricity | 0.085 | |
inclination [degrees] | 86.2 | |
omega [degrees] | 0.0 | |
orbital period [days] | 1.96162529 | |
u0 | 2.742576195708661 | |
u1 | -4.931708061082621 | |
u2 | 4.8916102981511465 | |
u3 | -1.7024783598865132 | |
duration | 0.1166 | 0.0056 |
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 | 1.042 | 0.029 |
Am2 | -0.039 | 0.029 |
a/Rs | 4.1 | 0.21 |
Rp/Rs | 0.143 | 0.017 |
ephemeris [JD] | 2459850.7695 | 0.0047 |
eccentricity | 0.085 | |
inclination [degrees] | 86.2 | |
omega [degrees] | 0.0 | |
orbital period [days] | 1.96162529 | |
u0 | 2.071994999092654 | |
u1 | -3.7645538713508975 | |
u2 | 4.276351348182605 | |
u3 | -1.5837924122017606 | |
duration | 0.1712 | 0.0099 |
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 | NANF (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 0.988 | 0.019 |
Am2 | 0.0108 | 0.0075 |
a/Rs | 4.79 | 0.74 |
Rp/Rs | 0.094 | 0.016 |
ephemeris [JD] | 2459852.7297 | 0.0063 |
eccentricity | 0.085 | |
inclination [degrees] | 86.2 | |
omega [degrees] | 0.0 | |
orbital period [days] | 1.96162529 | |
u0 | 2.4773643654090316 | |
u1 | -4.450690408983129 | |
u2 | 4.620822673419622 | |
u3 | -1.647496560989901 | |
duration | 0.137 | 0.026 |
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 | NANF (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.0002 | 0.0075 |
Am2 | -0.0003 | 0.0026 |
a/Rs | 5.85 | 0.32 |
Rp/Rs | 0.1109 | 0.0052 |
ephemeris [JD] | 2459897.858 | 0.0028 |
eccentricity | 0.085 | |
inclination [degrees] | 86.2 | |
omega [degrees] | 0.0 | |
orbital period [days] | 1.96162529 | |
u0 | 1.828302116306659 | |
u1 | -3.1933589014369166 | |
u2 | 3.798392826165626 | |
u3 | -1.4333359844349043 | |
duration | 0.1116 | 0.0068 |
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 | CCHD (collaborate/publish) |

Parameter | Value | Uncertainty |
---|---|---|
Am1 | 1.032 | 0.0089 |
Am2 | -0.0172 | 0.0026 |
a/Rs | 5.83 | 0.72 |
Rp/Rs | 0.106 | 0.013 |
ephemeris [JD] | 2460152.8671 | 0.007 |
eccentricity | 0.085 | |
inclination [degrees] | 86.2 | |
omega [degrees] | 0.0 | |
orbital period [days] | 1.96162529 | |
u0 | 2.0720618517607803 | |
u1 | -3.7650094368568583 | |
u2 | 4.276989000726467 | |
u3 | -1.584041351898286 | |
duration | 0.112 | 0.017 |
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 | 0.9947 | 0.007 |
Am2 | 0.0043 | 0.0026 |
a/Rs | 5.37 | 0.29 |
Rp/Rs | 0.1193 | 0.0069 |
ephemeris [JD] | 2460252.9122 | 0.0031 |
eccentricity | 0.085 | |
inclination [degrees] | 86.2 | |
omega [degrees] | 0.0 | |
orbital period [days] | 1.96162529 | |
u0 | 2.4152308751135982 | |
u1 | -4.2687185079194885 | |
u2 | 4.431263834888135 | |
u3 | -1.5777761360512685 | |
duration | 0.124 | 0.0078 |
Included in ephemeris calculations
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) |