TYC 9486-927-1
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Octans |
| Right ascension | 21h 25m 27.4805s |
| Declination | −81° 38′ 27.692″ |
| Apparent magnitude (V) | 11.5 - 12.0 |
| Characteristics | |
| Spectral type | M1 V |
| Variable type | BY Dra |
| Astrometry | |
| Radial velocity (Rv) | 8.7±4.6 km/s |
| Proper motion (μ) | RA: 60.645(46) mas/yr Dec.: −107.740(48) mas/yr |
| Parallax (π) | 29.0266±0.0401 mas |
| Distance | 112.4 ± 0.2 ly (34.45 ± 0.05 pc) |
| Details | |
| Mass | 0.53 M☉ |
| Radius | 0.46 R☉ |
| Luminosity | 0.032 L☉ |
| Surface gravity (log g) | 4.3 cgs |
| Temperature | 3,490 K |
| Metallicity [Fe/H] | −1.3 dex |
| Rotation | 0.541945 days |
| Rotational velocity (v sin i) | 43.5±1.2 km/s |
| Age | 10-45 Myr |
| Other designations | |
| 2MASS J21252752-8138278, FT Octantis | |
| Database references | |
| SIMBAD | data |
TYC 9486-927-1 (also known as 2MASS J21252752-8138278) is the primary of a possible trinary star system located at a distance of 34.5 parsecs from Earth in the southern direction in the constellation of Octans. It is a BY Draconis variable, with large starspots causing it to change brightness as it rotates every 13 hours.
TYC 9486-927-1 has rapid rotation and coronal and chromospheric activity suggestive of a young age. Observations and multi-epoch radial velocity data suggest that TYC 9486-927-1 is a single, rapidly rotating star rather than a spectroscopic or tight visual binary. However, it is still possible that TYC 9486-927-1 is an equal mass binary with a face-on orbit and close separation.
The candidate secondary stellar companion is 2MASS J21121598–8128452. It is a red dwarf star of spectral class M5.5. Its projected separation from the primary would be 62,700 AU. The candidate tertiary companion is 2MASS J21192028–8145446 - of spectral class M6 or M7 and at a projected separation of 31,000 AU from the primary.: 7