S Ori 70
S Ori 70 (also known as S Ori J053810.1−023626 , S Orionis 70 or 2MASS J0538101−023626 ) is an interstellar object in the constellation Orion at the coordinates α = 5 h 38 m 10 s , δ = −2 ° 36 ′ 26 ″. The nature of S Ori 70 has not yet been clarified and is the subject of current research; it could be a young object of planetary mass as well as a brown dwarf .
S Ori 70 was discovered in 2002 by Zapatero Osorio and others while studying the Sigma Orionis Cluster , a young open star cluster about 440 parsecs (around 1400 light years ) away. It is not clear whether the object is part of this star cluster. If one assumes belonging to the Sigma-Orionis cluster, the photometric and spectroscopic properties of the object with the help of models result in a mass of well below 13 Jupiter's masses, which would make it an object of planetary mass . If, on the other hand, the object is not part of the star cluster, then it is a brown dwarf of the spectral class T6. If the first hypothesis is true, then model calculations give a rough estimate of the mass of the celestial body of around 3 Jupiter masses and a radius of around 1.6 Jupiter radii.
The position of S Ori 70 shifts by 0.011 arc seconds every year due to its own motion .
Web links
Individual evidence
- ↑ MR Zapatero Osorio et al .: A Methane, Isolated, Planetary ‐ Mass Object in Orion . In: The Astrophysical Journal . tape 578 , no. 1 , October 10, 2002, p. 536-542 , doi : 10.1086 / 342474 .
- ^ WH Sherry, FM Walter, SJ Wolk, NR Adams: Main-Sequence Fitting Distance to the σ Ori Cluster . In: The Astronomical Journal . tape 135 , no. 4 , April 2008, p. 1616-1623 , doi : 10.1088 / 0004-6256 / 135/4/1616 .
- ↑ SOri 70 (English) - entry at DwarfArchives.org ; Status: January 21, 2009 (accessed on: October 30, 2012)