This page summarises the information held within TEPCat for the transiting planetary system WASP-18. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2009Natur.460.1098H | |
| Date of discovery paper | 2009 / 8 / 27 | y / m / d |
| Data/telescope used for discovery | WASP | |
| Right ascension | 01 37 25.03 | h m s |
| Declination | −45 40 40.4 | d m s |
| Right ascension (decimal) | 24.35429 | degrees |
| Declination (decimal) | -45.67789 | degrees |
| V-band apparent magnitude | 9.27 | mag |
| K-band apparent magnitude | 8.13 | mag |
| Transit duration | 0.09079 ( 2.1790 ) | day hour |
| Transit depth | 1.2 | % |
| Time of mid-transit | 2458375.169847 ± 0.000019 | HJD or BJD |
| Orbital period | 0.941452379 ± 0.000000016 | days |
| Reference for orbital ephemeris | arXiv:2505.01544 |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 6332 ± 60 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | +0.08 ± 0.04 | dex |
| Stellar mass | 1.245 +0.057 −0.058 | Msun |
| Stellar radius | 1.256 ± 0.008 | Rsun |
| Stellar logarithmic surface gravity | 4.34 ± 0.10 | c.g.s. |
| Stellar mean density | 0.655 ± 0.035 ( 0.924 ± 0.049 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.00852 ± 0.00091 | |
| Orbital semimajor axis | 0.02041 +0.00015 −0.00014 | AU |
| Planetary mass | 10.52 ± 0.32 ( 33442 ± 1017 ) | Mjup Mearth |
| Planetary radius | 1.1926 ± 0.0077 ( 13.368 ± 0.086 ) | Rjup Rearth |
| Planetary surface gravity | 179.9 ± 6.4 4.26 ± 0.02 | m/s2 log(cgs) |
| Planetary mean density | 5.64 ± 0.31 ( 7.48 ± 0.41 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 2411 ± 35 | K |
| Reference of detailed study | arXiv:2505.01544 |
| Reference | λ (degrees) |
|---|---|
| Triaud et al. (2010) | 4.0 ± 5.0 |
| Albrecht et al. (2012) | 13 ± 7 |
Page generated on 2025/08/27 John Southworth (Keele University, UK)