The 830--1120 A Spectrum of a Bright Comet: First Results on Hale-Bopp

Details The 830--1120 A Spectrum of a Bright Comet: First Results on Hale-Bopp The 830--1120 A Spectrum of a Bright Comet: First Results on Hale-Bopp

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dps....30.2904s&link_type=abstract

American Astronomical Society, DPS meeting #30, #29.04; Bulletin of the American Astronomical Society, Vol. 30, p.1063

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The EUVS planetary sounding rocket spectrograph was flown on 29 March 1997 from White Sands, New Mexico to observe comet Hale-Bopp in the bandpass from 830--1120 Angstroms. At the time of launch the comet was near perihelion, 0.92 AU from the Sun, 1.34 AU from Earth, and traveling at a heliocentric radial velocity of +0.70 km/s. EUVS obtained its primary spectra of the comet at resolution near 3 Angstroms, collecting 9340 counts over approximately 330 seconds of integration time. To our knowledge, the resulting dataset is both the most sensitive and the highest spectral resolution probe of a comet in the UV below 1200 Angstroms yet achieved. The spectrum includes significant detections which we tentatively attribute to due to 834 Angstroms 0 II, the 1026 Angstroms H I Lyman beta /O I blend, and 989 Angstroms O I; we will also discuss evidence for Argon signatures, as well as two additional, yet to be identified features. We will describe the EUVS Hale-Bopp experiment and its results, including feature brightnesses, corresponding columns, and species abundance ratios in the inner coma. In addition to its value for providing insight into comets in general, and Hale-Bopp in particular, this spectrum is serving as an excellent input for New Millennium Deep Space 1/MICAS and Rosetta/ALICE UV observation planning below 1200 Angstroms.

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