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The eccentricity is greater than one, which means the comet has a hyperbolic orbit. The perihelion date is September 9, 2011 with a precision of +/- 1.7 days. The perihelion distance is 0.4762 (+/-0.008 a.u.).
August 1st the comet will come close to “STEREO-B” spacecraft , with a distance of only 7 million km (0.047 a.u.). Unfortunately the comet will not be visible in the field of view of this spacecraft; the comet will pass below it, but it is entirely possible that STEREO B will pass through the comet’s tail. At the moment of maximum brightness, which for a short period of time may exceed mag. 0, the comet will be visible in images from the coronagraph of another spacecraft oberving the Sun – “SOHO“.
Originally posted by wildespace
Perihelion (closest approach to the Sun) is on Sep 10th.
Closest approach to Earth is on Oct 16-17.