This page summarises the information held within TEPCat for the transiting planetary system TOI-921. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | arXiv:2509.14782 | |
| Date of discovery paper | 2025 / 9 / 19 | y / m / d |
| Data/telescope used for discovery | TESS | |
| Right ascension | 15 17 18.76 | h m s |
| Declination | −80 28 24.1 | d m s |
| Right ascension (decimal) | 229.32817 | degrees |
| Declination (decimal) | -80.47336 | degrees |
| V-band apparent magnitude | 12.67 | mag |
| K-band apparent magnitude | 8.20 | mag |
| Transit duration | 0.071 ( 1.70 ) | day hour |
| Transit depth | 0.2 | % |
| Time of mid-transit | 2458628.4061 ± 0.0004 | HJD or BJD |
| Orbital period | 4.6780691 ± 0.0000017 | days |
| Reference for orbital ephemeris | arXiv:2509.14782 |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 3572 ± 100 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | −0.19 ± 0.07 | dex |
| Stellar mass | 0.418 ± 0.030 | Msun |
| Stellar radius | 0.419 ± 0.028 | Rsun |
| Stellar logarithmic surface gravity | 4.82 ± 0.09 | c.g.s. |
| Stellar mean density | 5.5 ± 0.5 ( 7.76 ± 0.71 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.58 ± 0.02 | |
| Orbital semimajor axis | 0.041 ± 0.001 | AU |
| Planetary mass | 0.0160 ± 0.0016 ( 5.09 ± 0.51 ) | Mjup Mearth |
| Planetary radius | 0.172 +0.012 −0.021 ( 1.93 +0.13 −0.24 ) | Rjup Rearth |
| Planetary surface gravity | 13 ± 2 3.11 ± 0.06 | m/s2 log(cgs) |
| Planetary mean density | 2.8 ± 0.6 ( 3.71 ± 0.80 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 551 ± 27 | K |
| Reference of detailed study | arXiv:2509.14782 |
TOI-921 does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2026/01/29 John Southworth (Keele University, UK)