TOI-421
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lepus |
| Right ascension | 05h 27m 24.8259s |
| Declination | −14° 16′ 37.046″ |
| Apparent magnitude (V) | 9.93 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | G9V |
| Astrometry | |
| Radial velocity (Rv) | 79.41±0.16 km/s |
| Proper motion (μ) | RA: −35.743±0.011 mas/yr Dec.: 50.387±0.011 mas/yr |
| Parallax (π) | 13.3337±0.0117 mas |
| Distance | 244.6 ± 0.2 ly (75.00 ± 0.07 pc) |
| Details | |
| Mass | 0.833+0.048 −0.054 M☉ |
| Radius | 0.866±0.006 R☉ |
| Surface gravity (log g) | 4.48±0.03 cgs |
| Temperature | 5291±64 K |
| Metallicity [Fe/H] | −0.044±0.04 dex |
| Rotation | 39.6±1.6 d |
| Rotational velocity (v sin i) | 1.8±1.0 km/s |
| Age | 10.9+2.9 −5.2 Gyr |
| Other designations | |
| BD−14 1137, Gaia DR2 2984582227215748864, Gaia DR3 2984582227215748864, PPM 711571, TOI-421, TIC 94986319, TYC 5344-1206-1, GSC 05344-01206, 2MASS J05272482-1416370 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
TOI-421 (also known as BD−14 1137) is a G-type main-sequence star located in the constellation Lepus. The star hosts two transiting exoplanets discovered in 2020 and forms a visual binary system with a nearby red dwarf star BD−14 1137 B. Both planets are hot Neptunes well-suited for atmospheric characterization. Due to the star's old age, knowing the composition of their atmosphere can provide valuable insights for validation of atmospheric evolution models.