This page summarises the information held within TEPCat for the transiting planetary system WASP-21. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2010A+A...519A..98B | |
| Date of discovery paper | 2010 / 6 / 14 | y / m / d |
| Data/telescope used for discovery | WASP | |
| Right ascension | 23 09 58.23 | h m s |
| Declination | +18 23 46.0 | d m s |
| Right ascension (decimal) | 347.49262 | degrees |
| Declination (decimal) | 18.39611 | degrees |
| V-band apparent magnitude | 11.59 | mag |
| K-band apparent magnitude | 9.98 | mag |
| Transit duration | 0.1426 ( 3.422 ) | day hour |
| Transit depth | 1.4 | % |
| Time of mid-transit | 2454743.04217 ± 0.00065 | HJD or BJD |
| Orbital period | 4.3225126 ± 0.0000022 | days |
| Reference for orbital ephemeris | 2015MNRAS.451.4060S |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 5924 ± 55 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | −0.22 ± 0.04 | dex |
| Stellar mass | 0.890 ± 0.079 | Msun |
| Stellar radius | 1.136 ± 0.051 | Rsun |
| Stellar logarithmic surface gravity | 4.277 ± 0.026 | c.g.s. |
| Stellar mean density | 0.607 ± 0.048 ( 0.856 ± 0.068 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.0 | |
| Orbital semimajor axis | 0.0499 ± 0.0015 | AU |
| Planetary mass | 0.276 ± 0.019 ( 87.7 ± 6.0 ) | Mjup Mearth |
| Planetary radius | 1.162 ± 0.054 ( 13.02 ± 0.61 ) | Rjup Rearth |
| Planetary surface gravity | 5.07 ± 0.35 2.71 ± 0.03 | m/s2 log(cgs) |
| Planetary mean density | 0.165 ± 0.018 ( 0.219 ± 0.024 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 1333 ± 28 | K |
| Reference of detailed study | 2013A+A...557A..30C |
| Reference | λ (degrees) |
|---|---|
| Chen et al. (2020) | 8 + 26 - 27 |
Page generated on 2025/03/17 John Southworth (Keele University, UK)