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

Discovery and observations

On 4 April 2009, Robert D. Matson reported the discovery of a comet spotted from images taken by the SWAN instrument of the SOHO spacecraft.[4] Around the same time, Hereupon H. Yamaoka of the University of Tokyo received an email from South Korean astronomer, Dae-am Yi, where he reported that he had discovered the comet nine days earlier on 26 March, at the time a 12th-magnitude object within the constellation Lacerta.[3]

The comet was too dim to be seen by the naked eye, though it was observed through small telescopes. It is hard to watch because it is small with a tiny tail in the visible-light spectrum. The comet reached a peak magnitude of 8.3 on 6 April,[4] and passed 1.5 degrees south of the Double cluster in Perseus on 23 April.[5] Preliminary calculations of its orbit by Brian G. Marsden indicate the comet is traveling in a highly inclined parabolic orbit, tipped 85.7° to the plane of the ecliptic. It reached perihelion on 8 May, where it came as close as 1.27 AU (190 million km) from the Sun.[5]

References

  1. ^ Horizons output. "Barycentric Osculating Orbital Elements for Comet C/2009 F6 (Yi-SWAN)". Retrieved 3 February 2011. (Solution using the Solar System Barycenter and barycentric coordinates. Select Ephemeris Type:Elements and Center:@0)
  2. ^ "C/2009 F6 (Yi–SWAN) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 26 March 2025.
  3. ^ a b "Analysis of Past Comet Apparitions: C/2009 F6 (Yi–SWAN)". Fachgruppe Kometen. Retrieved 26 March 2025.
  4. ^ a b D. W. Green (2009). "Comet C/2009 F6 (Yi–SWAN)". IAU Circular. 9035.
  5. ^ a b R. W. Sinott (8 April 2009). "New Circumpolar Comet Yi–SWAN". Sky & Telescope. Retrieved 13 April 2009.
Allikas: https://en.wikipedia.org/wiki/C/2009_F6
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