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Comet ISON brings holiday fireworks

Date:
July 2, 2013
Source:
Space Telescope Science Institute (STScI)
Summary:
Superficially resembling a skyrocket, Comet ISON is hurtling toward the Sun at 48,000 miles per hour. In May 2013, the comet was 403 million miles from Earth, between the orbits of Mars and Jupiter.
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Superficially resembling a skyrocket, Comet ISON is hurtling toward the Sun at a whopping 48,000 miles per hour.
Credit: Image courtesy of Space Telescope Science Institute (STScI)

This July 4th the solar system is showing off some fireworks of its own. Superficially resembling a skyrocket, Comet ISON is hurtling toward the Sun at a whopping 48,000 miles per hour.

Its swift motion is captured in this time-lapse movie made from a sequence of pictures taken May 8, 2013, by NASA's Hubble Space Telescope. At the time the images were taken, the comet was 403 million miles from Earth, between the orbits of Mars and Jupiter.

The movie shows a sequence of Hubble observations taken over a 43-minute span, compressed this into just five seconds. The comet travels 34,000 miles in this brief video, or 7 percent of the distance between Earth and the Moon. The deep-space visitor streaks silently against the background stars.

Unlike a firework, the comet is not combusting, but in fact is pretty cold. Its skyrocket-looking tail is really a streamer of gas and dust bleeding off the icy nucleus, which is surrounded by a bright, star-like-looking coma. The pressure of the solar wind sweeps the material into a tail, like a breeze blowing a windsock.

As the comet warms while it moves closer to the Sun, its rate of sublimation will increase. The comet will get brighter and the tail will grow longer. The comet is predicted to reach naked-eye visibility in November.

The comet is named after the organization that discovered it, the Russia-based International Scientific Optical Network.

Video: http://hubblesite.org/newscenter/archive/releases/2013/24/video/a/


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The above post is reprinted from materials provided by Space Telescope Science Institute (STScI). Note: Materials may be edited for content and length.


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Space Telescope Science Institute (STScI). "Comet ISON brings holiday fireworks." ScienceDaily. ScienceDaily, 2 July 2013. <www.sciencedaily.com/releases/2013/07/130702123043.htm>.
Space Telescope Science Institute (STScI). (2013, July 2). Comet ISON brings holiday fireworks. ScienceDaily. Retrieved September 4, 2015 from www.sciencedaily.com/releases/2013/07/130702123043.htm
Space Telescope Science Institute (STScI). "Comet ISON brings holiday fireworks." ScienceDaily. www.sciencedaily.com/releases/2013/07/130702123043.htm (accessed September 4, 2015).

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