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Mars Base

SOHO shows new images of Comet ISON - 0 views

phys.org/...11-soho-images-comet-ison.html

scibyte111 CometISON

shared by Mars Base on 28 Nov 13 - No Cached
  • scientists have been watching through many observatories to see if the comet has already broken up under the intense heat and gravitational forces of the sun
  • The comet is too far away to discern how many pieces it is in, so instead researchers carefully measure how bright it is,
  • Less light can sometimes mean that more of the material has boiled off and disappeared, perhaps pointing to a disintegrated comet
  • ...5 more annotations...
  • a disintegrating comet sometimes gives off more light, at least temporarily, so researchers look at the comet's pattern of behavior over the previous few days to work out what it may be doing.
  • At times observations have suggested ISON was getting dimmer and might already be in pieces
  • over Nov. 26-27, 2013, the comet once again brightened. In the early hours of Nov. 27, the comet appeared in the view of the European Space Agency/NASA mission the Solar and Heliospheric Observatory in the Large Angle and Spectrometric Coronagraph instrument
  • If the comet has already broken up, it should disintegrate completely as it makes its slingshot around the sun
  • This would provide a great opportunity for scientists to see the insides of the comet, and better understand its composition
Mars Base

ScienceShot: Comet ISON Could Be No More | Science/AAAS | News - 0 views

news.sciencemag.org/...ot-comet-ison-could-be-no-more

scibyte111 CometISON

shared by Mars Base on 28 Nov 13 - No Cached
  • ISON was
  • on course to swing by the sun less than one solar diameter above the sun’s searing surface on 28 November, Thanksgiving Day in the United States
Mars Base

Remnants Suggest Comet ISON Still Going: Scientific American - 0 views

www.scientificamerican.com/article.cfm

scibyte111 CometISON

shared by Mars Base on 01 Dec 13 - No Cached
  • as ISON got closer to the star
  • Analyses of light captured by NASA’s twin STEREO spacecraft seemed to show the comet growing dimmer
  • Next, pictures from NASA’s Solar Dynamics Observatory, which should have captured ISON on its closest approach to the Sun, showed absolutely nothing
  • ...2 more annotations...
  • Then the European–US Solar and Heliospheric Observatory spotted a faint glimmer on the other side of the Sun, on a trajectory where ISON would have been expected to appear
  • ISON is probably the most observed comet ever
Mars Base

Comet ISON faded again | Human World | EarthSky - 0 views

earthsky.org/...n-might-be-spectacular-in-2013

scibyte111 CometISON

shared by Mars Base on 01 Dec 13 - No Cached
  • NOVEMBER 29, 2013.
  • Comet ISON rounded the sun yesterday at 18:45 UTC/ 1:45 p.m. EST, and appeared to be disintegrating
  • Then yesterday evening the comet started appearing brighter again
  • ...1 more annotation...
  • NOVEMBER 30, 2013
Mars Base

Is comet ISON disintegrating? - 0 views

phys.org/...comet-ison-disintegrating.html

scibyte105 CometISON

shared by Mars Base on 06 Oct 13 - No Cached
  • predictions
  • concerning the uncertain future of Comet ISON
  • supported by the most recent optical observation
  • ...16 more annotations...
  • the comet is still showing an unexpected behavior that cometary specialists are fighting to explain
  • . The brightness has remained practically constant for more than 270 days or 9 months, a behavior without any precedent in cometary astronomy
  • presented and discussed what he identified as a peculiar photometric signature previously observed in disintegrating comets
  • . The following few weeks will reveal the real fate of weird Comet ISON.
  • No theoretical model exists capable of explaining all the observed phenomena with those defunct comets.
  • Several well known facts about the strange behavior of Comet ISON should be widely recognized.
  • It was expected that the comet would bright up after passing the "frost line
  • the comet has already passed that line and almost none has occurred.
  • ISON has surprised experts by maintaining almost unmodified its photometric behavior.
  • ISON faces other challenges
  • First, the comet will reach perihelion very near the Sun
  • calculated a temperature of 2,700 degrees Celsius, high enough to melt iron and lead
  • Second,
  • the comet will penetrate the solar Roche limit.
  • Any object penetrating this forbidden limit will experience solar tides that may tear apart the nucleus of the comet
  • The combination of temperature, radiation and tides may prove too much for the comet, which may not survive the encounter with the Sun
Mars Base

Mars Orbiter Spies Lackluster Comet ISON : Discovery News - 0 views

news.discovery.com/...met-ison-closing-in-131002.htm

scibyte105 CometISON ViewerFeedback

shared by Mars Base on 05 Oct 13 - No Cached
  • High-Resolution Imaging Science Experiment (HiRISE) camera aboard NASA’s Mars Reconnaissance Orbiter (MRO) have released their first observations of the incoming Comet ISON
  • the comet appears to be at the low end of the range of brightness predictions
  • as it falls deeper and deeper into the sun’s gravitational well, ISON will likely brighten
  • ...1 more annotation...
  • addition of gas and dust should cause the comet’s coma to increase in size.
Mars Base

Comet ISON Buzzing Mars Now: A Telescope Viewing Guide | Space.com - 0 views

www.space.com/near-mars-telescope-guide.html

scibyte105 CometISON ViewerFeedback

shared by Mars Base on 05 Oct 13 - No Cached
  • Seeing Comet ISON: A telescope guide
  • If you really want to try to see Comet ISON for yourself, you'll need two things
  • A dark sky.
  • ...15 more annotations...
  • A moderately large telescope.
  • A comet's brightness
  • an "extended" object with the light inside the comet's head spread out over a larger area of space
  • (a dark sky) is absolutely necessary
  • telescope in the 8 to 12-inch range
  • magnification of at least 200 to 300 power
  • if you're trying to see the comet you’ll have much better success by looking off to one side of its position (averted vision) rather than staring right at it; in that way you’ll be able to better detect its faint and fuzzy image
  • if you're trying to see the comet you’ll have much better success by looking off to one side of its position (averted vision) rather than staring right at it; in that way you’ll be able to better detect its faint and fuzzy image
  • Tuesday, Oct. 15. 
  • the comet will appear 1.1 degrees above and to the left of Mars, while Mars itself is passing only 0.9 degrees above and to the left of the bluish 1st-magnitude star Regulus
  • Comet ISON continues to run roughly two magnitudes fainter than original projections
  • recent 'discovery' of a jet feature may be the key in understanding Comet ISON's behavior during the past 7 weeks
  • observers
  • have begun to notice a lengthening of Comet ISON's tail
  • might" be a sign that the sun's warmth has indeed begun to make the comet more active by way of sublimation
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