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Infrared Images of Jupiter


Infrared Images of Jupiter

Astronomers at the University of Massachusetts will be observing the effects of the impacts of the fragments of comet SL-9 using a 256x256 NICMOS3 infrared camera (NICMASS) at the 0.4m Whately Observatory.

This 1.64 5m image of Jupiter is the result of observations taken at the Whately Observatory on July 13, 1994 UT at wavelengths of 1.64 5m, 2.12 5m, 2.16 5m, and 2.23 - 2.29 5m. These observations were obtained so that there are reference images of Jupiter before its atmosphere is disturbed by the impacts.

The main objective is to monitor the changes in the appearance of Jupiter at a wavelength of 2.26 Ám. At visible wavelengths, light from the Sun can pass through Jupiter's upper atmosphere, reflect off of cloud particles, and emerge again through the upper atmosphere to be seen by a distant observer. At certain wavelengths in the infrared, particularly between 2.2 and 2.4 Ám, methane and molecular hydrogen in Jupiter's atmosphere strongly absorb the incident sunlight -- long before it can penetrate through the atmosphere to reflect off of the clouds. As a result, Jupiter reflects virtually no sunlight at certain near-infrared wavelengths, making it appear nearly pitch-black to an observer working at these wavelengths. Our expectation is that the impacts of the fragments of comet SL-9 will stir particles high enough into the atmosphere so that sunlight can reflect off of them before being absorbed. Jupiter may develop a bright spot near the impact site that will be spread around the planet as a belt by the global winds.

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