Astronomy Picture of the Day -- PanSTARRS: The Anti Tail Comet

NASA ^ | June 29, 2013 | (see photo credit)

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Explanation: Once known as Earth's sunset comet, PanSTARRS (C/2011 L4) is up all night now, but only for northern hemisphere skygazers. Telescopes are required to track its progress as it fades and heads for the outer solar system. But because planet Earth passed through the comet's orbital plane in late May, PanSTARRS will also be remembered for its remarkably long anti-tail. That edge-on perspective looking along the broad, fanned-out dust tail as it trailed behind the comet created the appearance of an anti-tail pointing in the sunward direction, back toward the inner solar system. Recorded on the night of May 27, this 13 pane mosaic (shown in positive and negative views) follows PanSTARRS' anti-tail as it stretches over 7 degrees from the comet's coma at the far right. The anti-tail was likely much longer, but gets lost in the evening's bright moonlight encroaching on the left edge of the scene. Background star cluster NGC 188 in Cepheus shows up along the way, near top left.

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[Credit & Copyright: Pete Lawrence (Digital-Astronomy)]

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The Big One

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[dr_lew]

FWIW, here's the "anti-tail" position in a view from my Starry Night software. The brighter stars are identifiable, but NGC188 is not shown. Note the head of the comet is near a double star, one of which has the designation shown.