This page summarises the information held within TEPCat for the transiting planetary system NGTS-21. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2022MNRAS.517.4447A | |
| Date of discovery paper | 2022 / 10 / 4 | y / m / d |
| Data/telescope used for discovery | NGTS | |
| Right ascension | 20 45 01.99 | h m s |
| Declination | −35 25 40.2 | d m s |
| Right ascension (decimal) | 311.25829 | degrees |
| Declination (decimal) | -35.42783 | degrees |
| V-band apparent magnitude | 15.62 | mag |
| K-band apparent magnitude | 12.95 | mag |
| Transit duration | 0.0813 ( 1.951 ) | day hour |
| Transit depth | 2.6 | % |
| Time of mid-transit | 2458228.77853 ± 0.00067 | HJD or BJD |
| Orbital period | 1.5433897 ± 0.0000016 | days |
| Reference for orbital ephemeris | 2022MNRAS.517.4447A |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 4660 ± 41 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | −0.26 ± 0.07 | dex |
| Stellar mass | 0.72 ± 0.04 | Msun |
| Stellar radius | 0.86 ± 0.04 | Rsun |
| Stellar logarithmic surface gravity | 4.63 ± 0.34 | c.g.s. |
| Stellar mean density | ρsun g cm-3 | |
| Orbital eccentricity | 0.0 | |
| Orbital semimajor axis | 0.0236 ± 0.0005 | AU |
| Planetary mass | 2.36 ± 0.21 ( 750 ± 66 ) | Mjup Mearth |
| Planetary radius | 1.33 ± 0.03 ( 14.91 ± 0.34 ) | Rjup Rearth |
| Planetary surface gravity | m/s2 log(cgs) | |
| Planetary mean density | 0.94 ± 0.13 ( 1.25 ± 0.17 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 1357 ± 15 | K |
| Reference of detailed study | 2022MNRAS.517.4447A |
NGTS-21 does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2025/03/12 John Southworth (Keele University, UK)