TYC 9486-927-1

Last updated
TYC 9486-927-1
FTOctLightCurve.png
A light curve for FT Octantis, plotted from TESS data [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Octans
Right ascension 21h 25m 27.4805s [2]
Declination −81° 38 27.692 [2]
Apparent magnitude  (V)11.5 - 12.0 [3]
Characteristics
Spectral type M1 V [4]
Variable type BY Dra [3]
Astrometry
Radial velocity (Rv)8.7±4.6 [4]  km/s
Proper motion (μ)RA: 60.645(46)  mas/yr [2]
Dec.: −107.740(48)  mas/yr [2]
Parallax (π)29.0266 ± 0.0401  mas [2]
Distance 112.4 ± 0.2  ly
(34.45 ± 0.05  pc)
Details
Mass 0.53 [5]   M
Radius 0.46 [6]   R
Luminosity 0.032 [6]   L
Surface gravity (log g)4.3 [7]   cgs
Temperature 3,490 [8]   K
Metallicity [Fe/H]−1.3 [7]   dex
Rotation 0.541945 [3] days
Rotational velocity (v sin i)43.5±1.2 [8]  km/s
Age 10-45 [8]   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. [3]

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. [4]

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. [5] :7

Planetary system

The planet 2MASS J21265040-8140293 orbits TYC 9486-927-1 at a projected separation of 7400 AU. [5] With a mass from 11.6 to 15 Jupiter masses, it is considered to be either a brown dwarf, or a giant planet. [9] [10]

The TYC 9486-927-1 planetary system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
2MASS J2126–8140/b13.3 (± 1.7) [11]   MJ 6,900 [8] 328 725 000[ citation needed ]

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References

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