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Cover art by Fred Gambino for the 1997 Orbit edition of Heart of the Comet by David Brin and Gregory Benford. The first edition was published in early 1986 to coincide with the close approach of Halley’s Comet.
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Will Europe's Philae Comet Lander Make Another Comeback?
The lander team would love to get Philae up and running again soon so that they can get an up-close look at how this "perihelion passage" affects 67P. This work ended when Philae's primary battery died and the probe went into hibernation — a consequence of coming to rest in an unexpectedly shaded location. A recharge did end up happening, though it took much longer than planned: Philae phoned home on June 13, apparently revivified by the increasing levels of solar radiation it experienced as Comet 67P got closer and closer to the sun. http://dlvr.it/BhZSL5
Mars Orbiter Image Shows Comet Nucleus is Small
Pasadena CA (JPL) Oct 23, 2014 The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter captured views of comet C/2013 A1 Siding Spring while that visitor sped past Mars on Sunday (Oct. 19), yielding information about its nucleus. The images are the highest-resolution views ever acquired of a comet coming from the Oort Cloud at the fringes of the solar system. Other spac Full article
Mars Orbiter Image Shows Comet Nucleus is Small
NASA - Mars Reconnaissance Orbiter (MRO) logo. October 20, 2014
These images were taken of comet C/2013 A1 Siding Spring by NASA's Mars Reconnaissance Orbiter on Oct. 19, 2014, during the comet's close flyby of Mars and the spacecraft. Comet Siding Spring is on its first trip this close to the sun from the Oort Cloud at the outer fringe of the solar system. Image Credit: NASA/JPL-Caltech/University of Arizona. The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter captured views of comet C/2013 A1 Siding Spring while that visitor sped past Mars on Sunday (Oct. 19), yielding information about its nucleus. The images are the highest-resolution views ever acquired of a comet coming from the Oort Cloud at the fringes of the solar system. Other spacecraft have approached and studied comets with shorter orbits. This comet's flyby of Mars provided spacecraft at the Red Planet an opportunity to investigate from close range. This composite image shows two versions of each of two of the best HiRISE images of the comet. Shown at top are images with the full dynamic range, showing the nucleus and bright coma near the nucleus. Shown at bottom are versions where the fainter outer coma is brightened, saturating the inner region. The images at left and right were taken about nine minutes apart.
NASA's Mars Reconnaissance Orbiter spacecraft. Image Credits: NASA/JPL-Caltech
Images of comet Siding Spring from HiRISE are online at: http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA18618 The highest-resolution of images of the comet's nucleus, taken from a distance of about 86,000 miles (138,000 kilometers), have a scale of about 150 yards (138 meters) per pixel. Telescopic observers had modeled the size of the nucleus as about half a mile, or one kilometer wide. However, the best HiRISE images show only two to three pixels across the brightest feature, probably the nucleus, suggesting a size smaller than half that estimate. For more about HiRISE, visit: http://hirise.lpl.arizona.edu For more about Mars Reconnaissance Orbiter, visit: http://mars.nasa.gov/mro/ For more about comet Siding Spring, including other images of the comet, visit: http://mars.jpl.nasa.gov/comets/sidingspring/ Images (mentioned), Text, Credits: NASA / JPL / Guy Webster. Greetings, Orbiter.ch Full article
NASA all high-fives today after comet makes close encounter: That sound you hear is NASA collectively melting into puddles of joy after successfully getting within 500 miles of Comet Hartley 2. Look, you can see its nucleus. source
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