NICMOS 2-Micron Observations of Comet Hale-Bopp

Details NICMOS 2-Micron Observations of Comet Hale-Bopp NICMOS 2-Micron Observations of Comet Hale-Bopp

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...191.8805s&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #88.05; Bulletin of the American Astronomical Society, Vol. 29, p.1356

Astronomy and Astrophysics

Astronomy

Scientific paper

Near-infrared images of comet Hale-Bopp (C/1995 O1) were obtained from NICMOS on the Hubble Space Telescope on UT 27-28 August 1997, when the comet emerged from the 50 degree solar elongation limit and was 2.99 AU from Earth. We present diffraction-limited images with 0.2'' resolution, (corresponding to \ 420 km) taken during a single 50-minute orbit with camera 2 at 0.075''/pixel and a 19'' field-of-view. These images offer high contrast between the coma and nuclear regions since contamination from reflected sunlight/fluorescence are at a minimum and thermal emission from dust peaks at longer wavelengths. We observed in filters sensitive to spectral features of water vapor and water ice (F187N, 190N, F222M, F204M). We discuss the production of gas and dust in the inner coma and in a variety of extended structures imaged at high spatial resolution, including a "spiral arm" and several linear "jets".

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