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| ra = {{RA|21|25|27.4899}}<ref name=ucac4/>
| ra = {{RA|21|25|27.4899}}<ref name=ucac4/>
| dec = {{DEC|–81|38|27.673}}<ref name=ucac4/>
| dec = {{DEC|–81|38|27.673}}<ref name=ucac4/>
| appmag_v = 11.821<ref name=ucac4/>
| appmag_v = 11.5 - 12.0<ref name=gcvs/>
}}
}}
{{Starbox character
{{Starbox character
| class = M1 V<ref name=sacy/>
| class = M1 V<ref name=sacy/>
| variable = [[BY Draconis variable|BY Dra]]<ref name=gcvs/>
}}
}}
{{Starbox astrometry
{{Starbox astrometry
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| luminosity_visual =
| luminosity_visual =
| gravity =
| gravity =
| rotation =
| rotation = 0.541945<ref name=gcvs/> days
| rotational_velocity = 43.5 ± 1.2<ref name=deacon/>
| rotational_velocity = 43.5 ± 1.2<ref name=deacon/>
| age_gyr =
| age_gyr =
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{{Starbox end}}
{{Starbox end}}


'''TYC 9486-927-1''' (also known as '''2MASS J21252752-8138278''') is a primary of a 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 dwarf (luminosity class V) red (spectral class M1) variable by rotation.
'''TYC 9486-927-1''' (also known as '''2MASS J21252752-8138278''') is a primary of a 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 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/>
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<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=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
| display-authors=1 | last1=Samus | first1=N. N.
| last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.
| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.
| title=General Catalogue of Variable Stars
| version=5.1 | journal=Astronomy Reports
| year=2017 | volume=61 | issue=1 | pages=80–88
| bibcode=2017ARep...61...80S | s2cid=125853869
| doi=10.1134/S1063772917010085 }}</ref>


}}
}}

Revision as of 16:44, 26 May 2022

TYC 9486-927-1
Observation data
Epoch J2000      Equinox J2000
Constellation Octans
Right ascension 21h 25m 27.4899s[1]
Declination –81° 38′ 27.673″[1]
Apparent magnitude (V) 11.5 - 12.0[2]
Characteristics
Spectral type M1 V[3]
Variable type BY Dra[2]
Astrometry
Radial velocity (Rv)8.7 ± 4.6[3] km/s
Proper motion (μ) RA: 59.843 mas/yr
Dec.: -107.723 mas/yr
Parallax (π)29.2836 ± 0.0690 mas[4]
Distance111.4 ± 0.3 ly
(34.15 ± 0.08 pc)
Details
Mass0.53[5] M☉
Temperature3,490[6] K
Rotation0.541945[2] days
Rotational velocity (v sin i)43.5 ± 1.2[6] km/s
Age10-45[6] Myr
Other designations
2MASS J21252752-8138278, FT Octantis
Database references
SIMBADdata

TYC 9486-927-1 (also known as 2MASS J21252752-8138278) is a primary of a 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.[2]

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]

The secondary stellar companion is 2MASS J21121598–8128452. It is a red dwarf star of spectral class M5.5. Its projected separation from the primary is the 62,700 AU. The tertiary companion is 2MASS J21192028–8145446 - a young brown dwarf of spectral class M6 or M7 at projected separation of the 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.[7][8]

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 13.3 (± 1.7)[9] MJ 6,900[6] 328 725 000[citation needed] — — —

References

  1. ^ a b Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)". VizieR On-line Data Catalog: I/322A. Originally Published in: 2012yCat.1322....0Z; 2013AJ....145...44Z. 1322. Bibcode:2012yCat.1322....0Z.
  2. ^ 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.
  3. ^ 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.
  4. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  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
  6. ^ 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.
  7. ^ 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.
  8. ^ 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.
  9. ^ "Planet 2MASS J2126-8140". exoplanet.eu. Retrieved 2016-01-27.
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