This page summarises the information held within TEPCat for the transiting planetary system WASP-121. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2016MNRAS.458.4025D | |
| Date of discovery paper | 2015 / 6 / 9 | y / m / d |
| Data/telescope used for discovery | WASP | |
| Right ascension | 07 10 24.06 | h m s |
| Declination | −39 05 50.6 | d m s |
| Right ascension (decimal) | 107.60025 | degrees |
| Declination (decimal) | -39.09739 | degrees |
| V-band apparent magnitude | 10.52 | mag |
| K-band apparent magnitude | 9.37 | mag |
| Transit duration | 0.1211 ( 2.906 ) | day hour |
| Transit depth | 1.7 | % |
| Time of mid-transit | 2456635.70841 ± 0.00014 | HJD or BJD |
| Orbital period | 1.27492471 ± 0.00000008 | days |
| Reference for orbital ephemeris | 2022AcA....72....1M |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 6626 ± 66 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | +0.17 ± 0.05 | dex |
| Stellar mass | 1.330 ± 0.019 | Msun |
| Stellar radius | 1.461 ± 0.005 | Rsun |
| Stellar logarithmic surface gravity | 4.251 ± 0.003 | c.g.s. |
| Stellar mean density | 0.4470 ± 0.0024 ( 0.6307 ± 0.0034 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.0 +0.07 −0.0 | |
| Orbital semimajor axis | 0.02571 ± 0.00010 | AU |
| Planetary mass | 1.170 ± 0.043 ( 371 ± 13 ) | Mjup Mearth |
| Planetary radius | 1.742 ± 0.006 ( 19.526 ± 0.067 ) | Rjup Rearth |
| Planetary surface gravity | m/s2 log(cgs) | |
| Planetary mean density | 0.207 ± 0.008 ( 0.275 ± 0.011 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 2409 ± 24 | K |
| Reference of detailed study | 2024AJ....168..231S |
| Reference | λ (degrees) |
|---|---|
| Delrez et al. (2016) | −257.8 + 5.5 - 5.3 |
| Bourrier et al. (2020) | 87.20 + 0.41 - 0.45 |
| Borsa et al. (2021) | −87.08 + 0.29 - 0.27 |
Page generated on 2025/03/17 John Southworth (Keele University, UK)