Central Bureau for Astronomical Telegrams
IAUC 7642: MARS; C/2001 K9, C/2001 L1, C/2001 L2, C/2001 L3, C/2001 L4
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Circular No. 7642
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 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)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
MARS
R. Tresch Fienberg, Sky and Telescope (S&T), reports that he
and a team of observers representing S&T and the Association of
Lunar and Planetary Observers (T. Dobbins, G. Seronik, D. Parker,
T. D'Auria, D. Moore, P. D'Auria, D. Troiani, S. Ireland, L.
Ireland, C. Petersen, M. Petersen, and B. Itzenthaler), succeeded
in detecting a brightening of Edom Promontorium during June 7 and
8, both visually with two 0.15-m Newtonian reflectors and via
monochrome videotape recorded with a 0.30-m Schmidt-Cassegrain
reflector located in the Florida Keys, following predictions by
Dobbins and Sheehan [2001, S&T 101(5), 115]. Observing conditions
were good, with partly cloudy skies and excellent seeing. No
brightenings were detected under good observing conditions on June
5 and 6. A perceptible brightening of Edom was first detected
around June 7.274 UT, about 85 min before the feature transited
Mars' central meridian. By June 7.278, sporadic pulsations in
brightness were evident, occurring once or twice a minute with
brightness maxima of about 3-5 s duration that were not correlated
with atmospheric turbulence; these brightness variations, which
appeared along the north margin of Sinus Sabaeus, were seen
simultaneously by visual observers and by those viewing the video
monitor until June 7.312. Brightening around Edom also occurred
on June 8, having intensity like that of June 7, with a series of
short-lived (3- to 5-s) brightenings observed during June 8.292-
8.306 and another series of frequent variations seen during June
8.328-8.350. These specular reflections may continue for the next
few nights, as detailed by Dobbins and Sheehan (op.cit.).
COMETS C/2001 K9, C/2001 L1, C/2001 L2, C/2001 L3, C/2001 L4
Further to IAUC 7641, D. Hammer reports his measurements for
five additional Kreutz sungrazing comets found on LASCO C2
coronagraph images obtained with the SOHO spacecraft; C/2001 L3 was
also detected in C3 images. The reduced astrometry and orbital
elements by B. G. Marsden appear on the MPECs cited below.
Comet 2001 UT R.A. (2000) Decl. MPEC
C/2001 K9 May 24.993 4 09.2 +19 19 2001-L24
C/2001 L1 June 2.896 4 43.3 +20 37 2001-L21
C/2001 L2 4.204 4 48.4 +20 42 2001-L21
C/2001 L3 4.346 4 50.6 +19 56 2001-L24
C/2001 L4 5.646 4 54.0 +20 48 2001-L24
(C) Copyright 2001 CBAT
2001 June 8 (7642) Daniel W. E. Green
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