TYC 9486-927-1
| Observation data Epoch Equinox | |
|---|---|
| Constellation | Octans |
| Right ascension | 21h 25m 27.489s[1] |
| Declination | –81° 38′ 27.68″[1] |
| Characteristics | |
| Spectral type | M1 V[1][2] |
| Astrometry | |
| Radial velocity (Rv) | 8.7 (±4.6) km/s |
| Parallax (π) | MAS mas |
| Distance | 80.7 ly (24.75 pc) |
| Details | |
| Mass | 0.4 M☉ |
| Temperature | 3,490 K |
| Rotation | Variable Rotation |
| Rotational velocity (v sin i) | 43.5 (±1.2)[3] km/s |
| Age | 10-45 Myr |
| Other designations | |
2MASS J21252752-8138278 | |
TYC 9486-927-1 (also known as 2MASS J21252752-8138278) is a star located at a distance of 24.75 (± 4.25) parsecs from Earth in the southern direction in the constellation of Octans. It is a dwarf (luminosity class V) red (spectral class M1) variable by rotation.
The star is the primary object of a planetary system having the secondary object 2MASS J21265040-8140293. This substellar object, being an exoplanet, is the most extensive planetary systems known to date.
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.[3]
2MASS J21265040-8140293
2MASS J21265040-8140293 orbits TYC 9486-927-1 and remains a little-known subject. With a weight from 11.6 to 15 Jupiter masses, it was considered to be either a star, a brown dwarf, or a giant planet.[4][5] It has since be confirmed that it is actually an exoplanet.
References
- 1 2 3 "TYC 9486-927-1".
- ↑ "Search for associations containing young stars (SACY)" (PDF).
- 1 2 "A nearby young M dwarf with a wide, possibly planetary-mass companion" (PDF).
- ↑ "BANYAN. II. VERY LOW MASS AND SUBSTELLAR CANDIDATE MEMBERS TO NEARBY, YOUNG KINEMATIC GROUPS WITH PREVIOUSLY KNOWN SIGNS OF YOUTH".
- ↑ "ERRATUM: "MEETING THE COOL NEIGHBORS. X. ULTRACOOL DWARFS FROM THE 2MASS ALL-SKY DATA RELEASE"".