Tue, Nov 26, 2013
Comet Will Slingshot Around The Sun Thanksgiving Day
It began in the Oort cloud, almost a light year away. It has traveled for over a million years. It has almost reached the star that has pulled it steadily forward for so long. On Thanksgiving Day, Nov. 28, 2013, Comet ISON will finally sling shot around the sun. Here its inward journey through the solar system will end -- either because it will break up due to intense heat and gravity of the sun, or because, still intact, it speeds back away, never to return.
Catalogued as C/2012 S1, Comet ISON was first spotted 585 million miles away in September 2012. Scientists were instantly intrigued, not because spotting it so far away meant it might be very bright and beautiful once it was closer to Earth -- though this may indeed turn out to be the case if it survives its trip around the sun -- but because this is ISON's very first trip into the inner solar system. That means it is still made of pristine matter from the earliest days of the solar system's formation, its top layers never having been lost by a trip near the sun. Along Comet ISON's journey, NASA has used a vast fleet of spacecraft and Earth-based telescopes to learn more about this time capsule from when the solar system first formed.
During the last week of its inbound trip, ISON will enter the fields of view of several NASA Heliophysics observatories. Comet ISON will be viewed first by the broad field of view seen by NASA's Heliospheric Imager instrument aboard its Solar Terrestrial Relations Observatory, or STEREO, Next the comet will be seen in what's called coronagraphs, images that block the brighter view of the sun itself in order to focus on the solar atmosphere, the corona. Such images will come both from STEREO and the joint European Space Agency/NASA Solar and Heliospheric Observatory, or SOHO. Then, NASA's Solar Dynamics Observatory, or SDO, will view the comet for a few hours during its closest approach to the sun, known as perihelion. The X-Ray Telescope on the JAXA/NASA Hinode mission will also be looking at Comet ISON for about 55 minutes during perihelion.
All of these observatories will have different views. STEREO-B will be the only one that sees the comet transit across the face of the sun. In SDO's view, the comet will appear to travel above the sun, and the SDO instruments will point away from the center of the sun to get a better view for three hours on Nov. 28. In addition to learning more about the comet itself, these observations can make use of the comet as a tracer to show movement in the solar wind and solar atmosphere.
(Image provided by NASA)
More News
Aero Linx: Model Aeronautical Association of Australia MAAA clubs are about fun flying, camaraderie and community. For over 75 years, the MAAA has been Australia’s largest fl>[...]
Touchdown Zone Lighting Two rows of transverse light bars located symmetrically about the runway centerline normally at 100 foot intervals. The basic system extends 3,000 feet alon>[...]
“Discovery and innovation are central to our mission at Virgin Galactic. We’re excited to build on our successful record of facilitating scientific experiments in subor>[...]
How To Get A Story On Aero-TV News/Feature Programming How do I submit a story idea or lead to Aero-TV? If you would like to submit a story idea or lead, please contact Jim Campbel>[...]
Student Pilot Reported That During Rotation, “All Of A Sudden The Back Of The Plane Kicked To The Right..." Analysis: The student pilot reported that during rotation, “>[...]