Naked-eye Comet PanSTARRS continues to rise in northern hemisphere skies. I haven’t had clear skies to see the comet yet, but many have been forunate to see it with a young crescent Moon near sunset. This remarkable picture from last Tuesday shows the comet with the Earth in the background as seen from the STEREO Behind spacecraft. That spacecraft is nearly opposite the Sun trailing the Earth in its orbit. The Sun just off the left side of the image. The blob on the left is a huge enormous coronal mass ejection (CME) erupting from the Sun. Of course, the Sun’s CME, comet, and the Earth are all at different distances from the spacecraft—with the comet nearest. The image was processed from two consecutive frames from the spacecraft’s SECCHI Heliospheric Imager, causing the strong shadowing effect for objects that moved from one frame to the next. Objects that were too bright created the sharp vertical lines. Note the complicated feather-like structures in Comet PanSTARRS’s dust tail.
Image Credit: NASA