HD 260655
HD 260655 (also known as GJ 239 or TOI-4599) is a relatively bright and cool M0 V red dwarf star located 33 light-years (10 parsecs) away from the Solar System in the constellation of Gemini. HD 260655 has two confirmed rocky planets, named HD 260655 b and HD 260655 c, that were discovered in 2022. Both planets were detected by the TESS mission and confirmed independently with archival and new precise radial velocity data obtained with the HIRES observatory since 1998, and the CARMENES survey instruments since 2016.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Gemini |
| Right ascension | 06h 37m 10.79880s |
| Declination | +17° 33′ 53.3332″ |
| Apparent magnitude (V) | 9.77±0.11 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | M0.0V |
| Apparent magnitude (B) | 11.10±0.07 |
| Apparent magnitude (V) | 9.77±0.11 |
| Apparent magnitude (G) | 8.878±0.003 |
| Apparent magnitude (J) | 6.674±0.024 |
| Apparent magnitude (H) | 6.031±0.016 |
| Apparent magnitude (K) | 5.862±0.024 |
| Astrometry | |
| Radial velocity (Rv) | −58.64±0.16 km/s |
| Proper motion (μ) | RA: −764.414 mas/yr Dec.: 337.883 mas/yr |
| Parallax (π) | 100.0232 ± 0.0208 mas |
| Distance | 32.608 ± 0.007 ly (9.998 ± 0.002 pc) |
| Details | |
| Mass | 0.439±0.011 M☉ |
| Radius | 0.439±0.003 R☉ |
| Luminosity (bolometric) | 0.03631±0.00018 L☉ |
| Surface gravity (log g) | 5.20±0.07 cgs |
| Temperature | 3803±10 K |
| Metallicity [Fe/H] | −0.43±0.04 dex |
| Rotation | 37.5±0.4 d |
| Rotational velocity (v sin i) | <2.0 km/s |
| Age | 2-8 Gyr |
| Other designations | |
BD+17 1320, GJ 239, HD 260655, HIP 31635, CCDM J06372+1734A, WDS J06372+1733A, Ci 20 393, G 110-5, G 109-14, G 105-49, LFT 477, LHS 1858, LSPM J0637+1733, LTT 11880, NLTT 16743, PLX 1538, PM J06371+1733, Wolf 287, TOI-4599, TIC 307809773, TYC 1333-1683-1, GCRV 4273, IRAS 06342+1736, 2MASS J06371092+1733526 | |
| Database references | |
| SIMBAD | data |
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