This page summarises the information held within TEPCat for the transiting planetary system TRAPPIST-1b. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2016Natur.533..221G | |
| Date of discovery paper | 2016 / 5 / 3 | y / m / d |
| Data/telescope used for discovery | TRAPPIST | |
| Right ascension | 23 06 29.28 | h m s |
| Declination | −05 02 28.5 | d m s |
| Right ascension (decimal) | 346.62200 | degrees |
| Declination (decimal) | -5.04125 | degrees |
| V-band apparent magnitude | 18.80 | mag |
| K-band apparent magnitude | 10.30 | mag |
| Transit duration | 0.02513 ( 0.6031 ) | day hour |
| Transit depth | 0.70 | % |
| Time of mid-transit | 2457257.55044 ± 0.00015 | HJD or BJD |
| Orbital period | 1.510826 ± 0.000006 | days |
| Reference for orbital ephemeris | 2021PSJ.....2....1A |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 2566 ± 26 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | +0.04 ± 0.08 | dex |
| Stellar mass | 0.0898 ± 0.0023 | Msun |
| Stellar radius | 0.1192 ± 0.0013 | Rsun |
| Stellar logarithmic surface gravity | 5.2396 +0.0056 −0.0073 | c.g.s. |
| Stellar mean density | 48.0 ± 3.9 ( 67.7 ± 5.5 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.0 +0.081 −0.0 | |
| Orbital semimajor axis | 0.01154 ± 0.00010 | AU |
| Planetary mass | 0.0043 ± 0.0002 ( 1.367 ± 0.064 ) | Mjup Mearth |
| Planetary radius | 0.0996 +0.0012 −0.0011 ( 1.116 +0.013 −0.012 ) | Rjup Rearth |
| Planetary surface gravity | 10.81 ± 0.51 3.03 ± 0.02 | m/s2 log(cgs) |
| Planetary mean density | 4.09 +0.20 −0.21 ( 5.43 +0.27 −0.28 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 391.8 ± 5.5 | K |
| Reference of detailed study | 2021PSJ.....2....1A |
| Reference | λ (degrees) |
|---|---|
| Hirano et al.(2020) | 15 + 26 - 30 |
Page generated on 2025/03/17 John Southworth (Keele University, UK)