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News Release 8 of 178

October 17, 2013 02:00 PM (EDT)

News Release Number: STScI-2013-42

Comet ISON Appears Intact

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Image: Incoming Comet ISON Appears Intact to NASA's Hubble

Incoming Comet ISON Appears Intact to NASA's HubbleSTScI-PRC2013-42

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A new image of the sunward plunging Comet ISON suggests that the comet is intact despite some predictions that the fragile icy nucleus might disintegrate as the Sun warms it. The comet will pass closest to the Sun on November 28.

In this NASA Hubble Space Telescope image taken on October 9, the comet's solid nucleus is unresolved because it is so small. If the nucleus broke apart then Hubble would have likely seen evidence for multiple fragments.

Moreover, the coma or head surrounding the comet's nucleus is symmetric and smooth. This would probably not be the case if clusters of smaller fragments were flying along. A polar jet of dust first seen in Hubble images taken in April is no longer visible and may have turned off.

This color composite image was assembled using two filters. The comet's coma appears cyan, a greenish-blue color due to gas, while the tail is reddish due to dust streaming off the nucleus. The tail forms as dust particles are pushed away from the nucleus by the pressure of sunlight. The comet was inside Mars' orbit and 177 million miles from Earth when photographed. Comet ISON is predicted to make its closest approach to Earth on December 26, at a distance of 39.9 million miles.

For additional information, contact:

Ray Villard
Space Telescope Science Institute, Baltimore, Md.
410-338-4514
villard@stsci.edu

Zolt Levay
Space Telescope Science Institute, Baltimore, Md.
410-338-4907
levay@stsci.edu

On Thursday, October 17 at 4pm EDT there will be a live chat event with Hubble’s comet scientists to discuss the new image and latest research findings on ISON.
Visit
https://plus.google.com/u/0/events/c9dk60hck3hnpmp73db0ejvldc0 .

Object Name: Comet ISON

Image Type: Astronomical

Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

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