[IAUC] CBET 491: 20060429 : COMET 73P/SCHWASSMANN-WACHMANN
IAUC mailing list
quai en cfa.harvard.edu
Vie Jun 22 17:07:21 ART 2007
Electronic Telegram No. 491
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html
COMET 73P/SCHWASSMANN-WACHMANN
D. Schleicher, Lowell Observatory, obtained narrowband photometry
of comet 73P on Apr. 25 at r = 1.13 AU using the Hall 1.1-m telescope
at Lowell Observatory, with the following averaged results:
Component C: log Q(OH) = 27.75; equivalent log Q(water; vectorial) =
27.86; log Q(CN) = 25.22; log Q(C_2) = 24.49; log Af(rho) = 2.3 (cf.
IAUC 7342).
Component B: log Q(OH) = 27.48; loq Q(water) = 27.59;
log Q(CN) = 25.06; log Q(C_2) = 24.24; log Af(rho) = 1.5.
Component G: log Q(OH) = 26.58; loq Q(water) = 26.69;
log Q(CN) = 24.15; log Q(C_2) = 23.33; log Af(rho) = 0.5.
All three components show strong depletions (7-9 times) in the C_2-to-CN
ratio relative to "typical" as defined by A'Hearn et al. (1995, Icarus
118, 223). The dust-to-gas ratios, based on Af(rho) vs. OH, for
components B and G are much lower (3-4 times) than for the primary
component, C.
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2006 CBAT
2006 April 29 (CBET 491) Daniel W. E. Green
Más información sobre la lista de distribución Iauc