GREEN SNOWBALL ON ITS WAY

Comet ISON (Credit: Adam Block/Mount Lemmon SkyCenter/University of Arizona)

(credit: Adam Block) This new image was taken by astrophotographer Adam Block on October 8 using an SBIG STX-16803 camera with a hefty 36.8-by-36.8 millimeter CCD sensor that provides a 16.8 megapixel image, attached to the University of Arizona’s 32-inch Schulman Telescope.

ISON’s green glow may be due to the presence of carbon molecules and seems to be intact.

Comet ISON intact so far

NASA, ESA and the Hubble Heritage Team (STScI/AURA) / October 9, 2013)

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. What’s more, a polar jet of dust first seen in Hubble images taken in April is no longer visible and may have turned off.

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

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