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"url": "https://svs.gsfc.nasa.gov/11384/", "page_type": "Produced Video", "title": "How to Cook a Comet", "description": "A comet's journey through the solar syste is perilous and violent. Before it reaches Mars - at some 230 million miles away from the sun - the radiation of the sun begins to cook off the frozen water ice directly into gas. This is called sublimation. It is the first step toward breaking the comet apart. If it survives this, the intense radiation and pressure closer to the sun could destroy it altogether.Animators at NASA's Goddard Space Flight Center in Greenbelt, Md. created this short movie showing how the sun can cook a comet. Such a journey is currently being made by Comet ISON. It began its trip from the Oort cloud region of our solar system and is now traveling toward the sun. The comet will reach its closest approach to the sun on Thanksgiving Day — Nov. 28, 2013 — skimming just 730,000 miles above the sun’s surface. If it comes around the sun without breaking up, the comet will be visible in the Northern Hemisphere with the naked eye, and from what we see now, ISON is predicted to be a particularly bright and beautiful comet. Even if the comet does not survive, tracking its journey will help scientists understand what the comet is made of, how it reacts to its environment, and what this explains about the origins of the solar system. Closer to the sun, watching how the comet and its tail interact with the vast solar atmosphere can teach scientists more about the sun itself. || ", "release_date": "2013-11-21T14:00:00-05:00", "update_date": "2023-05-03T13:51:26.102592-04:00", "main_image": { "id": 461733, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011300/a011384/cometcooking320.jpg", "filename": "cometcooking320.jpg", "media_type": "Image", "alt_text": "Watch this video on the Goddard YouTube channel.", "width": 320, "height": 180, "pixels": 57600 } }, { "id": 4017, "url": "https://svs.gsfc.nasa.gov/4017/", "page_type": "Visualization", "title": "Comet ISON Approaches Perihelion", "description": "Currently located beyond the orbit of Jupiter, Comet ISON is heading for a very close encounter with the sun next year. In November 2013, it will pass less than 0.012 Astronomical Units (Wikipedia) (1.8 million kilometers) from the center of the Sun, 1.2 million kilometers from the solar surface. The fierce heating it experiences in that approach could turn the comet into a bright naked-eye object.NOTE: This visualization was revised in March 2013 to fix an ephemeris error. Other enhancements were included in the revision. Also fixed an error where perihelion distance was mistakenly labeled as distance from solar surface. || ", "release_date": "2013-03-29T11:00:00-04:00", "update_date": "2025-01-05T22:18:51.999903-05:00", "main_image": { "id": 467386, "url": "https://svs.gsfc.nasa.gov/vis/a000000/a004000/a004017/CometISON2.slate_HEEmove.HD1080i.0420.jpg", "filename": "CometISON2.slate_HEEmove.HD1080i.0420.jpg", "media_type": "Image", "alt_text": "Visualization of the orbit of comet ISON as it moves into the inner solar system in 2013.", "width": 1920, "height": 1080, "pixels": 2073600 } }, { "id": 11222, "url": "https://svs.gsfc.nasa.gov/11222/", "page_type": "Produced Video", "title": "The Path of Comet ISON", "description": "Comet C/2012 S1, better known as comet ISON, may become a dazzling sight as it traverses the inner solar system in late 2013. During the weeks before its Nov. 28 close approach to the sun, the comet will be observable with small telescopes, and binoculars. Observatories around the world and in space will track the comet during its fiery trek around the sun. If ISON survives its searing solar passage, which seems likely but is not certain, the comet may be visible to the unaided eye in the pre-dawn sky during December.Watch the animations on this page to visualize ISON's voyage through the inner solar system, or build the paper model of its orbit to track the changing positions of Earth and the comet.Like all comets, ISON is a clump of frozen gases mixed with dust. Often described as \"dirty snowballs,\" comets emit gas and dust whenever they venture near enough to the sun that the icy material transforms from a solid to gas, a process called sublimation. Jets powered by sublimating ice also release dust, which reflects sunlight and brightens the comet. On Nov. 28, ISON will make a sweltering passage around the sun. The comet will approach within about 730,000 miles (1.2 million km) of its visible surface, which classifies ISON as a sungrazing comet. In late November, its icy material will furiously sublimate and release torrents of dust as the surface erodes under the sun's fierce heat, all as sun-monitoring satellites look on. Around this time, the comet may become bright enough to glimpse just by holding up a hand to block the sun's glare.Sungrazing comets often shed large fragments or even completely disrupt following close encounters with the sun, but for ISON neither fate is a forgone conclusion.Following ISON's solar swingby, the comet will depart the sun and move toward Earth, appearing in morning twilight through December. The comet will swing past Earth on Dec. 26, approaching within 39.9 million miles (64.2 million km) or about 167 times farther than the moon.The comet was discovered on Sept 21, 2012, by Russian astronomers Vitali Nevski and Artyom Novichonok using a telescope of the International Scientific Optical Network (ISON) located near Kislovodsk.Learn more about sungrazing comets. || ", "release_date": "2013-03-29T11:00:00-04:00", "update_date": "2025-01-05T00:17:07.797970-05:00", "main_image": { "id": 467495, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011200/a011222/Instruction_still.png", "filename": "Instruction_still.png", "media_type": "Image", "alt_text": "This paper model illustrates the comet's path during its six-month trek in the vicinity of Earth, Venus and Mercury. Track how the relationship between Earth and the comet constantly changes by referring to the dates along both orbits.Download the pdf with instructions here.", "width": 934, "height": 602, "pixels": 562268 } } ], "sources": [], "products": [], "newer_versions": [], "older_versions": [], "alternate_versions": [] }