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C/2011 L4 PANSTARRS August 21, 2012 with FSQ-106ED and Reducer QE 0.73x | by hirocun
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C/2011 L4 PANSTARRS August 21, 2012 with FSQ-106ED and Reducer QE 0.73x

The comet is expected to be a great comet, which will pass the perihelion at 0.3AU from the Sun and 1.1AU from the Earth on March 10, 2013, though it looked tiny about magnitude 12 at 3.5AU from the Sun and us in August 2012, seven months before the perihelion. I hope to watch the comet after the sunset on March 10, 2013.


This frame is cropped 1,146 x 783 pixels of the original 5,631 x 3,747 pixels, comparable to a frame taken with an optics of 1,850mm in focal length. North is up.


The night was four days before the night when the comet comes to the stationary point. The movement of the comet was very slow, less than 2 arcminutes a day at the night, and I could not detect the movement on the frames taken while this imaging for less than an hour.



equipment: Takahashi FSQ-106ED, Reducer QE 0.73x, and Canon EOS 5Dmk2-sp2 by Seo san at ISO 1,600 on Takahashi EM-200 temma 2Jr, autoguided with hiro-design off-axis guider, StarlightXpress Lodestar autoguider, and PHD Guiding


exposure: 2 times x 15 minutes, 2 x 4 min, and 3 x 1 minute during 2012-8-21 06:27:34 - 07:15:30 UTC or 2012-8-20 20:27:34 - 21:15:30 Hawaiian time


Location: 11,000 feet above sea level near MLO, Mauna Loa Observatory on the shoulder of Mauna Loa in the Big Island, Hawaii


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Taken on August 21, 2012