SAO 206462

SAO 206462 is a young star, surrounded by a circumstellar disc of gas and clearly defined spiral arms. It is situated about 460 light-years away from Earth in the constellation Lupus.[4] The presence of these spiral arms seems to be related to the existence of planets inside the disk of gas surrounding the star. The disk's diameter is about twice the size of the orbit of Pluto.[5]

SAO 206462
Observation data
Epoch J2000      Equinox J2000
Constellation Lupus
Right ascension  15h 15m 48.4394s[1]
Declination −37° 09′ 16.026″[1]
Apparent magnitude (V) 8.708[2]
Characteristics
Spectral type F8V[2]
Astrometry
Proper motion (μ) RA: -19.7[2] mas/yr
Dec.: -24.0[2] mas/yr
Distance460 ly
(140[3] pc)
Other designations
HD 135344B, SAO 206462, CPD-36°6759, TYC 7324-1676-1, 2MASS J15154844-3709160
Database references
SIMBADdata

Discovery

The discovery of this object was presented in October 2011 by Carol Grady, astronomer of Eureka Scientific, headquartered in the Goddard Space Flight Center at NASA. It was the first of this class that exhibited a high degree of clarity and was made using several space telescopes (Hubble, FUSE, Spitzer) and earth telescopes (Gemini Observatory and Subaru Telescope, situated in Hawaii), through an international research program of young stars and of stars with planets. A number of astronomers of different observatories collaborated.[6]

gollark: I don't think that's what the electoral college does.
gollark: There's probably some nice mathematical definition based on mutual information or something like that, but roughly "altering one vote has the same effect on average on a nationwide election regardless of where the voter is".
gollark: What I meant to mean is that the electoral college is clearly not making people's votes equal in power.
gollark: Yes, sorry, that is why I corrected that.
gollark: * representative → equal across people

References
  1. Hog, E. (1998). "The Tycho Reference Catalogue". Astronomy and Astrophysics. 335: L65. Bibcode:1998A&A...335L..65H.
  2. "SAO 206462". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 December 2016.
  3. Manoj, P. (2006). "Evolution of Emission-Line Activity in Intermediate-Mass Young Stars". The Astrophysical Journal. 653 (1): 657–674. arXiv:astro-ph/0608541. Bibcode:2006ApJ...653..657M. doi:10.1086/508764.
  4. La NASA capta una fotografía de SAO 206462, la primera estrella con forma espiral. Informe21.com, 3 November 2011
  5. https://science.nasa.gov/science-news/science-at-nasa/2011/31oct_spiralarms/ 31 October 2011. Nasa Science.
  6. REVEALING THE STRUCTURE OF A PRE-TRANSITIONAL DISK: THE CASE OF THE HERBIG F STAR SAO 206462 (HD 135344B). C.A. Grady et al. The Astrophysical Journal 699 (2009) 1822. doi:10.1088/0004-637X/699/2/1822
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