This page summarises the information held within TEPCat for the transiting planetary system WASP-4. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2008ApJ...675L.113W | |
| Date of discovery paper | 2007 / 11 / 22 | y / m / d |
| Data/telescope used for discovery | WASP | |
| Right ascension | 23 34 15.06 | h m s |
| Declination | −42 03 41.1 | d m s |
| Right ascension (decimal) | 353.56275 | degrees |
| Declination (decimal) | -42.06142 | degrees |
| V-band apparent magnitude | 12.46 | mag |
| K-band apparent magnitude | 10.75 | mag |
| Transit duration | 0.08994 ( 2.1586 ) | day hour |
| Transit depth | 2.9 | % |
| Time of mid-transit | 2456505.748956 ± 0.000023 | HJD or BJD |
| Orbital period | 1.338231262 ± 0.000000014 | days |
| Reference for orbital ephemeris | 2025MNRAS.541..714B |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 5540 ± 55 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | −0.03 ± 0.09 | dex |
| Stellar mass | 0.899 ± 0.032 | Msun |
| Stellar radius | 0.912 ± 0.007 | Rsun |
| Stellar logarithmic surface gravity | 4.472 +0.013 −0.012 | c.g.s. |
| Stellar mean density | 1.185 +0.035 −0.032 ( 1.672 +0.049 −0.045 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.0 | |
| Orbital semimajor axis | 0.02294 +0.00028 −0.00026 | AU |
| Planetary mass | 1.200 +0.032 −0.030 ( 381.47 +10.17 −9.54 ) | Mjup Mearth |
| Planetary radius | 1.349 +0.011 −0.012 ( 15.12 + 0.12 − 0.13 ) | Rjup Rearth |
| Planetary surface gravity | 16.33 +0.38 −0.35 3.213 +0.010 −0.009 | m/s2 log(cgs) |
| Planetary mean density | 0.488 +0.013 −0.011 ( 0.647 +0.017 −0.015 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 1672 ± 28 | K |
| Reference of detailed study | 2025MNRAS.541..714B |
| Reference | λ (degrees) |
|---|---|
| Triaud et al. (2010) | 4 + 34 - 43 |
| Sanchis-Ojeda et al. (2011) | −1 + 14 - 12 |
Page generated on 2025/08/27 John Southworth (Keele University, UK)