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| epoch = J2000
| epoch = J2000
| constell = [[Octans]]
| constell = [[Octans]]
| ra = {{RA|21|25|27.4899}}<ref name=ucac4/>
| ra = {{RA|21|25|27.4805}}<ref name="Gaia DR3"/>
| dec = {{DEC|-81|38|27.673}}<ref name=ucac4/>
| dec = {{DEC|−81|38|27.692}}<ref name="Gaia DR3"/>
| appmag_v = 11.5 - 12.0<ref name=gcvs/>
| appmag_v = 11.5 - 12.0<ref name=gcvs/>
}}
}}
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{{Starbox astrometry
{{Starbox astrometry
| radial_v = {{val|8.7|4.6}}<ref name=sacy/>
| radial_v = {{val|8.7|4.6}}<ref name=sacy/>
| prop_mo_ra = 59.843
| prop_mo_ra = {{val|60.645|(46)}}
| prop_mo_dec = −107.723
| prop_mo_dec = {{val|−107.740|(48)}}
| pm_footnote = <ref name="Gaia DR3"/>
| parallax = 29.2836
| p_error = 0.0690
| parallax = 29.0266
| p_error = 0.0401
⚫
| parallax_footnote = <ref name=dr2>{{cite DR2|6348514275456913792}}</ref>
| parallax_footnote = <ref name="Gaia DR3"/>
| dist_ly =
| dist_pc =
| absmag_v =
| absmag_v =
}}
}}
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| metal =
| metal =
| mass = 0.53<ref name=Smart2019/>
| mass = 0.53<ref name=Smart2019/>
| mass_mj =
| radius = 0.46<ref name=conch/>
| radius = 0.46<ref name=conch/>
| temperature = 3,490<ref name=deacon/>
| temperature = 3,490<ref name=deacon/>
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{{Starbox end}}
{{Starbox end}}


'''TYC 9486-927-1''' (also known as '''2MASS J21252752-8138278''') is the primary of a possible trinary [[star system]] located at a distance of 26.7 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.<ref name=gcvs/>
'''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.<ref name=gcvs/>


TYC 9486-927-1 has rapid rotation and [[stellar corona|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.<ref name=sacy/>
TYC 9486-927-1 has rapid rotation and [[stellar corona|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.<ref name=sacy/>


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 [[astronomical unit|AU]]. The candidate tertiary companion is 2MASS J21192028–8145446 - a young brown dwarf of spectral class M6 or M7 at a projected separation of 31,000 [[astronomical units|AU]] from the primary.<ref name=Smart2019/>{{rp|7}}
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 [[astronomical unit|AU]]. The candidate tertiary companion is 2MASS J21192028–8145446 - of spectral class M6 or M7 and at a projected separation of 31,000 [[astronomical units|AU]] from the primary.<ref name=Smart2019/>{{rp|7}}


==Planetary system==
==Planetary system==
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}}
}}
{{OrbitboxPlanet
{{OrbitboxPlanet
| exoplanet = [[2MASS J2126-8140]]
| exoplanet = {{nowrap|[[2MASS J2126–8140]]/b}}
| mass = 13.3 (± 1.7)<ref name=Exoplanet.eu>{{cite web
| mass = 13.3 (± 1.7)<ref name=Exoplanet.eu>{{cite encyclopedia
|url = http://exoplanet.eu/catalog/2m_j2126-81_b
|url = https://exoplanet.eu/catalog/2m_j2126_81_b--2544/
|encyclopedia = [[Extrasolar Planets Encyclopaedia]]
|title = Planet 2MASS J2126-8140
|title = Planet 2MASS J2126-8140
|work = exoplanet.eu
|access-date = 2016-01-27
|access-date = 2016-01-27
}}</ref>
}}</ref>
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}}
}}
{{Orbitbox end}}
{{Orbitbox end}}

==References==
==References==
{{Reflist|refs=
{{Reflist|refs=

⚫
<ref name="Gaia DR3">{{Cite Gaia DR3|6348514275456913792}}</ref>


<ref name=reid>{{cite journal|bibcode=2008AJ....136.1290R|title=Meeting the Cool Neighbors. X. Ultracool Dwarfs from the 2MASS All-Sky Data Release|journal=The Astronomical Journal|volume=136|issue=3|pages=1290|last1=Reid|first1=I. Neill|last2=Cruz|first2=Kelle L.|last3=Kirkpatrick|first3=J. Davy|last4=Allen|first4=Peter R.|last5=Mungall|first5=F.|last6=Liebert|first6=James|last7=Lowrance|first7=Patrick|last8=Sweet|first8=Anne|year=2008|doi=10.1088/0004-6256/136/3/1290|arxiv=0806.3413}}</ref>
<ref name=reid>{{cite journal|bibcode=2008AJ....136.1290R|title=Meeting the Cool Neighbors. X. Ultracool Dwarfs from the 2MASS All-Sky Data Release|journal=The Astronomical Journal|volume=136|issue=3|pages=1290|last1=Reid|first1=I. Neill|last2=Cruz|first2=Kelle L.|last3=Kirkpatrick|first3=J. Davy|last4=Allen|first4=Peter R.|last5=Mungall|first5=F.|last6=Liebert|first6=James|last7=Lowrance|first7=Patrick|last8=Sweet|first8=Anne|year=2008|doi=10.1088/0004-6256/136/3/1290|arxiv=0806.3413}}</ref>
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<ref name=sacy>{{cite journal|bibcode=2006A&A...460..695T|arxiv=astro-ph/0609258|title=Search for associations containing young stars (SACY). I. Sample and searching method|journal=Astronomy and Astrophysics|volume=460|issue=3|pages=695|last1=Torres|first1=C. A. O.|last2=Quast|first2=G. R.|last3=Da Silva|first3=L.|last4=de la Reza|first4=R.|last5=Melo|first5=C. H. F.|last6=Sterzik|first6=M.|year=2006|doi=10.1051/0004-6361:20065602|s2cid=16080025}}</ref>
<ref name=sacy>{{cite journal|bibcode=2006A&A...460..695T|arxiv=astro-ph/0609258|title=Search for associations containing young stars (SACY). I. Sample and searching method|journal=Astronomy and Astrophysics|volume=460|issue=3|pages=695|last1=Torres|first1=C. A. O.|last2=Quast|first2=G. R.|last3=Da Silva|first3=L.|last4=de la Reza|first4=R.|last5=Melo|first5=C. H. F.|last6=Sterzik|first6=M.|year=2006|doi=10.1051/0004-6361:20065602|s2cid=16080025}}</ref>

<ref name=ucac4>{{cite journal|bibcode=2012yCat.1322....0Z|title=VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)|journal=VizieR On-line Data Catalog: I/322A. Originally Published in: 2012yCat.1322....0Z; 2013AJ....145...44Z|volume=1322|last1=Zacharias|first1=N.|last2=Finch|first2=C. T.|last3=Girard|first3=T. M.|last4=Henden|first4=A.|last5=Bartlett|first5=J. L.|author5-link=Jennifer Bartlett (astronomer)|last6=Monet|first6=D. G.|last7=Zacharias|first7=M. I.|year=2012}}</ref>


<ref name=gcvs>{{cite journal
<ref name=gcvs>{{cite journal

Revision as of 20:59, 16 May 2024

TYC 9486-927-1

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]
Distance112.4 ± 0.2 ly
(34.45 ± 0.05 pc)
Details
Mass0.53[5] M☉
Radius0.46[6] R☉
Luminosity0.032[6] L☉
Surface gravity (log g)4.3[7] cgs
Temperature3,490[8] K
Metallicity [Fe/H]−1.3[7] dex
Rotation0.541945[3] days
Rotational velocity (v sin i)43.5±1.2[8] km/s
Age10-45[8] Myr
Other designations
2MASS J21252752-8138278, FT Octantis
Database references
SIMBADdata

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/b 13.3 (± 1.7)[11] MJ 6,900[8] 328 725 000[citation needed] — — —

References

  1. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ a b c d Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  4. ^ a b c Torres, C. A. O.; Quast, G. R.; Da Silva, L.; de la Reza, R.; Melo, C. H. F.; Sterzik, M. (2006). "Search for associations containing young stars (SACY). I. Sample and searching method". Astronomy and Astrophysics. 460 (3): 695. arXiv:astro-ph/0609258. Bibcode:2006A&A...460..695T. doi:10.1051/0004-6361:20065602. S2CID 16080025.
  5. ^ a b c Jones, H R A.; Caballero, J. A.; Beamín, J. C.; Barrado, D.; Sarro, L. M.; Marocco, F.; Smart, R. L. (2019), "The Gaia Ultra-Cool Dwarf Sample – II: Structure at the end of the main sequence", Monthly Notices of the Royal Astronomical Society, 485 (3): 4423–4440, arXiv:1902.07571, Bibcode:2019MNRAS.485.4423S, doi:10.1093/mnras/stz678, S2CID 119421722{{citation}}: CS1 maint: unflagged free DOI (link)
  6. ^ a b Gaidos, E.; et al. (September 2014). "Trumpeting M dwarfs with CONCH-SHELL: a catalogue of nearby cool host-stars for habitable exoplanets and life". Monthly Notices of the Royal Astronomical Society. 443 (3): 2561–2578. arXiv:1406.7353. Bibcode:2014MNRAS.443.2561G. doi:10.1093/mnras/stu1313. S2CID 119234492.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  7. ^ a b Steinmetz, M.; et al. (2020). "VizieR Online Data Catalog: RAVE 6th data release (Steinmetz+, 2020)". Vizier Online Data Catalog. Bibcode:2020yCat.3283....0S.
  8. ^ a b c d Deacon, N. R.; Schlieder, J. E.; Murphy, S. J. (2016). "A nearby young M dwarf with a wide, possibly planetary-mass companion". Monthly Notices of the Royal Astronomical Society. 457 (3): 3191. arXiv:1601.06162. Bibcode:2016MNRAS.457.3191D. doi:10.1093/mnras/stw172. S2CID 18220333.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  9. ^ Gagné, Jonathan; Lafrenière, David; Doyon, René; Malo, Lison; Artigau, Étienne (2014). "BANYAN. II. Very Low Mass and Substellar Candidate Members to Nearby, Young Kinematic Groups with Previously Known Signs of Youth". The Astrophysical Journal. 783 (2): 121. arXiv:1312.5864. Bibcode:2014ApJ...783..121G. doi:10.1088/0004-637X/783/2/121. S2CID 119251619.
  10. ^ Reid, I. Neill; Cruz, Kelle L.; Kirkpatrick, J. Davy; Allen, Peter R.; Mungall, F.; Liebert, James; Lowrance, Patrick; Sweet, Anne (2008). "Meeting the Cool Neighbors. X. Ultracool Dwarfs from the 2MASS All-Sky Data Release". The Astronomical Journal. 136 (3): 1290. arXiv:0806.3413. Bibcode:2008AJ....136.1290R. doi:10.1088/0004-6256/136/3/1290.
  11. ^ "Planet 2MASS J2126-8140". Extrasolar Planets Encyclopaedia. Retrieved 2016-01-27.
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