Hubble image archive
Incoming Comet ISON Appears Intact to NASA's Hubble
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...
- Date
- Jan 1, 2013
- Mission
- Hubble Space Telescope
- Archive ID
- hubblesite-images-2013-42-3248-image
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.
Credits
NASA, ESA, and the Hubble Heritage Team (STScI/AURA)Image Details
| About The Object | |
|---|---|
| Object Name | Comet ISON |
| Object Description | Comet |
| Distance | At the time of the Hubble observations on October 9, 2013, the comet was 1.49 astronomical units (139 million miles) from the Sun. The comet was 1.91 astronomical units (177 million miles) from Earth. |
| About The Data | |
| Data Description | The image was created from Hubble data from proposal by the Hubble Heritage Team, PI: Z. Levay, M. Mutchler, C. Christian, L. Frattare, W. Januszewski, M. Livio, J. Mack, and J. Sokol (STScI/AURA), and K. Noll (NASA/GSFC). High-level science products for these data are available from the MAST archive at . |
| Instrument | HST>WFC3/UVIS |
| Exposure Dates | October 9, 2013, Exposure Time: 29 minutes |
| Filters | F438W (B) and F775W (i') |
| About The Image | |
| Color Info | This image is a composite of separate exposures acquired by the WFC3/UVIS instrument. Several filters were used to sample various wavelengths. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are: Blue/green: F438W (B) and Orange: F775W (i') |
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Image and source material are credited to the official mission archive linked below.
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