Electronic Telegram No. 1113
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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COMET 8P/TUTTLE
     D. Schleicher, Lowell Observatory, writes that he obtained narrowband
photometry of comet 8P on Nov. 1 (r = 1.63 AU) using the Hall 1.1-m
telescope at Lowell Observatory, resulting in the following production
rates:  log Q(OH) = 27.56; equivalent log Q(water; vectorial) = 27.59;
log Q(NH) = 25.09; log Q(CN) = 24.82; log Q(C_2) = 24.99; log Q(C_3) =
24.52; log [Af(rho)] (526 nm) = 1.14 (cf. IAUC 7342).  The resulting
abundance ratios confirm that 8P/Tuttle has "typical" composition and a
very low dust-to-gas ratio, consistent with the results from its 1980
apparition (A'Hearn et al. 1995, Icarus 118, 223).


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 November 3                  (CBET 1113)              Daniel W. E. Green