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Analysis of Hubble Space Telescope (HST ) images of comet Hale-Bopp (C/1995 O1) suggests that the effective diameter of the nucleus is between 27 to 42 kilometers, which is at least three times larger than that of comet P/Halley. The International Ultraviolet Explorer and HST spectra showed emissions from OH (a tracer of H 2 O) and CS (a tracer of CS 2 ) starting in April 1996, and from the CO Cameron system (which primarily traces CO 2 ) starting in June 1996. The variation of the H 2 Odoi:10.1126/science.275.5308.1900 pmid:9072959 fatcat:zuzqzdird5agrbenpunbpiiole