This page summarises the information held within TEPCat for the transiting planetary system TOI-521. 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 | 08 13 22.62 | h m s |
| Declination | +12 13 19.6 | d m s |
| Right ascension (decimal) | 123.34425 | degrees |
| Declination (decimal) | 12.22211 | degrees |
| V-band apparent magnitude | 14.69 | mag |
| K-band apparent magnitude | 10.09 | mag |
| Transit duration | 0.049 ( 1.18 ) | day hour |
| Transit depth | 0.2 | % |
| Time of mid-transit | 2458492.7153 ± 0.0005 | HJD or BJD |
| Orbital period | 1.54285047 ± 0.0000009 | days |
| Reference for orbital ephemeris | arXiv:2509.14782 |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 3544 ± 100 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | −0.12 ± 0.08 | dex |
| Stellar mass | 0.420 ± 0.030 | Msun |
| Stellar radius | 0.421 ± 0.028 | Rsun |
| Stellar logarithmic surface gravity | 4.81 ± 0.09 | c.g.s. |
| Stellar mean density | 5.8 +0.4 −0.5 ( 8.18 +0.56 −0.71 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.0 | |
| Orbital semimajor axis | 0.0195 ± 0.0003 | AU |
| Planetary mass | 0.0167 ± 0.0031 ( 5.31 ± 0.99 ) | Mjup Mearth |
| Planetary radius | 0.176 ± 0.012 ( 1.97 ± 0.13 ) | Rjup Rearth |
| Planetary surface gravity | 13 ± 3 3.11 ± 0.09 | m/s2 log(cgs) |
| Planetary mean density | 2.6 ± 0.7 ( 3.45 ± 0.93 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 794 ± 35 | K |
| Reference of detailed study | arXiv:2509.14782 |
TOI-521 does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2026/01/29 John Southworth (Keele University, UK)