Comet Yi–SWAN

Comet C/2009 F6 (Yi–SWAN) is a non-periodic comet which appeared in March 2009.

C/2009 F6 (Yi–SWAN)
Discovered byDae-am Yi, SWAN instrument on SOHO spacecraft
Discovery dateMarch 26, 2009
Orbital characteristics A
Aphelion904 AU[1]
Perihelion1.274072 AU
Semi-major axis453 AU[1]
Orbital period~9,600 yr[1]
Last perihelionApril 7, 2009

March 26, 2009 -- it was discovered by Korean Dae-am Yi using a simple hand-held Canon 5D camera and 90-mm lens valued at US$249. According to legend, it is the first comet discovered by a Korean in the modern age.[2] April 4th, 2009 -- Rob Matson reported he discovered it in the SWAN instrument photographs on the SOHO (Solar and Heliospheric Observatory) spacecraft website; the estimated cost is believed to exceed US$160,000,000,000.[3]

The comet is too dim to be seen by the naked eye, but was theoretically-visible through amateur telescopes. It is hard to watch because it is small with a tiny tail in the visible-light spectrum. It reached a peak magnitude around +8.5 in April into May, and passed 1.5 degrees south of the Double cluster in Perseus on April 23.[3]


  1. Horizons output. "Barycentric Osculating Orbital Elements for Comet C/2009 F6 (Yi-SWAN)". Retrieved 2011-02-03. (Solution using the Solar System Barycenter and barycentric coordinates. Select Ephemeris Type:Elements and Center:@0)
  2. Meyer, Maik. "Forum communication". Retrieved 2009-04-13.
  3. Sinnott, Robert (2009-04-08). "New Circumpolar Comet Yi-SWAN". Sky and Telescope. Archived from the original on 2009-04-11. Retrieved 2009-04-13.

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