V4046 Sagittarii

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V4046 Sagittarii
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 18h 14m 10.4660s[1]
Declination −32° 47′ 34.496″[1]
Apparent magnitude (V) 10.68[2]
Spectral type K5Ve / K7Ve[3]
Variable type T Tauri[3]
Radial velocity (Rv) −6.94[3] km/s
Distance 271 ly
(83[3] pc)
Period (P) 2.4213305 ± 0.000004 d
Eccentricity (e) ≤0.01
Inclination (i) 35°
Periastron epoch (T) JD 2452380.867 ± 0.03
Mass 0.912 / 0.873 M
Surface gravity (log g) 4.0 / 4.0 cgs
Temperature 4370 / 4100 K
Rotational velocity (v sin i) 14.2 / 13.7 km/s
Other designations
HD 319139, CD−32° 13906, GSC 07396-00644
Database references

V4046 Sagittarii is young T Tauri binary consisting of two K-type main-sequence stars, surrounded by a massive protoplanetary disk where gas giants are thought to have formed. Stars A and B orbit each other in 2.44 days in circular orbits, leading to the conclusion that terrestrial planets may also form in the habitable zone around these stars.[citation needed]

The red dwarf binary GSC 07396-00759 is separated about 2.82″ from V4046 Sagittarii. Since it has a similar motion throughout space with V4046 Sagittarii, GSC 07396-00759 is assumed to be gravitationally bound (although weakly) to V4046 Sagittarii. The two systems are separated by at least 12,350 astronomical units (0.1953 ly) away, and the orbital period would be on the order of 100,000 years.[4]


  1. ^ a b Hog, E. (1998). "The Tycho Reference Catalogue". Astronomy and Astrophysics. 335: L65. Bibcode:1998A&A...335L..65H. 
  2. ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. 
  3. ^ a b c d e f Stempels, H. C.; Gahm, G. F. (2004). "The close T Tauri binary V 4046 Sagittarii". Astronomy & Astrophysics. 421 (3): 1159. Bibcode:2004A&A...421.1159S. doi:10.1051/0004-6361:20034502. 
  4. ^ Kastner, J. H.; Sacco, G. G.; Montez, R.; Huenemoerder, D. P.; Shi, H.; Alecian, E.; Argiroffi, C.; Audard, M.; Bouvier, J.; Damiani, F.; Donati, J.-F.; Gregory, S. G.; Güdel, M.; Hussain, G. A. J.; Maggio, A.; Montmerle, T. (2011). "GSC 07396-00759 = V4046 Sgr C[D]: A Wide-separation Companion to the Close T Tauri Binary System V4046 Sgr AB". The Astrophysical Journal. 740: L17. Bibcode:2011ApJ...740L..17K. arXiv:1109.3389Freely accessible. doi:10.1088/2041-8205/740/1/L17. 

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