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.

April 4, 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.

[2] 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.