This page summarises the information held within TEPCat for the transiting planetary system TOI-257. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2021MNRAS.502.3704A | |
| Date of discovery paper | 2020 / 1 / 22 | y / m / d |
| Data/telescope used for discovery | TESS | |
| Right ascension | 03 10 03.98 | h m s |
| Declination | −50 49 56.6 | d m s |
| Right ascension (decimal) | 47.51658 | degrees |
| Declination (decimal) | -50.83239 | degrees |
| V-band apparent magnitude | 7.61 | mag |
| K-band apparent magnitude | 6.26 | mag |
| Transit duration | 0.2644 ( 6.346 ) | day hour |
| Transit depth | 0.12 | % |
| Time of mid-transit | 2458404.14831 ± 0.00056 | HJD or BJD |
| Orbital period | 18.38827 ± 0.00072 | days |
| Reference for orbital ephemeris | 2021MNRAS.502.3704A |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 6096 ± 89 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | +0.177 ± 0.099 | dex |
| Stellar mass | 1.394 ± 0.046 | Msun |
| Stellar radius | 1.883 ± 0.033 | Rsun |
| Stellar logarithmic surface gravity | 4.032 ± 0.021 | c.g.s. |
| Stellar mean density | 0.208 +0.013 −0.012 ( 0.293 +0.018 −0.017 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.242 +0.040 −0.065 | |
| Orbital semimajor axis | 0.1523 ± 0.0017 | AU |
| Planetary mass | 0.134 +0.023 −0.022 ( 42.6 +7.3 −7.0 ) | Mjup Mearth |
| Planetary radius | 0.626 +0.013 −0.12 ( 7.02 +0.15 −1.35 ) | Rjup Rearth |
| Planetary surface gravity | 8.5 +1.5 −1.4 2.93 +0.07 −0.08 | m/s2 log(cgs) |
| Planetary mean density | 0.51 +0.10 −0.09 ( 0.68 +0.13 −0.12 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 1033 +19 −18 | K |
| Reference of detailed study | 2021MNRAS.502.3704A |
TOI-257 does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2025/03/17 John Southworth (Keele University, UK)