TYC 9486-927-1 (also known as 2MASS J21252752-8138278) is an M-type main-sequence star located 87 light years (26.7 parsecs) away from Earth in the constellation 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 named 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
Planetary system[]
| Planet | Mass | Semimajor axis | Orbital period | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| 2MASS J21265040-8140293 | 13.3 Jupiter mass | 6,900.0 AU | ~900,000 years | N/A | N/A | N/A |
2MASS J21265040-8140293 is an extrasolar planet which orbits this star. It has a mass of approximately 11.6 to 15 Jupiter masses, with estimates putting it to around 13.3 Jupiter masses. When it was discovered it was not known it was a star, a brown dwarf or giant planet, but it has been confirmed as an exoplanet.