This page summarises the information held within TEPCat for the transiting planetary system TRAPPIST-1g. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2017Natur.542..456G | |
| Date of discovery paper | 2017 / 2 / 23 | 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 | 0.04759 ( 1.1422 ) | day hour |
| Transit depth | 0.76 | % |
| Time of mid-transit | 2457257.71462 ± 0.00103 | HJD or BJD |
| Orbital period | 12.352446 ± 0.000054 | 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 +0.061 −0.0 | |
| Orbital semimajor axis | 0.04683 ± 0.00040 | AU |
| Planetary mass | 0.0042 ± 0.0001 ( 1.335 ± 0.032 ) | Mjup Mearth |
| Planetary radius | 0.1007 +0.0013 −0.0012 ( 1.129 +0.015 −0.013 ) | Rjup Rearth |
| Planetary surface gravity | 10.15 ± 0.26 3.01 ± 0.01 | m/s2 log(cgs) |
| Planetary mean density | 3.80 +0.10 −0.18 ( 5.04 +0.13 −0.24 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 194.5 ± 2.7 | K |
| Reference of detailed study | 2021PSJ.....2....1A |
TRAPPIST-1g does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2025/03/17 John Southworth (Keele University, UK)