Central Bureau for Astronomical Telegrams
IAUC 3927: 1984d; 1983n; 1983s
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Read IAUC 3928
Circular No. 3927
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
COMET RUSSELL (1984d)
The following precise positions have been measured by C.-Y.
Shao from exposures by G. Schwartz with the 0.40-m astrograph at
the Oak Ridge Observatory. The first exposure was badly guided
and the image impossible to measure very accurately.
1984 UT R.A. (1950.0) Decl. m1
Mar. 12.24195 13 30 36.84 + 0 59 45.6
12.35962 13 30 34.05 + 0 59 52.1 14
PERIODIC COMET CROMMELIN (1983n)
P. A. Wehinger, Arizona State University, communicates that
long-slit (4'5) CCD spectra were obtained with the Kitt Peak
National Observatory's 4-m telescope and cryogenic camera on Feb.
24.1, Mar. 2.1 and 3.1 by H. Spinrad, S. Wyckoff, M. J. S. Belton
and himself. In addition to the molecular emission features
reported on IAUC 3914, moderately weak HWO+ emission bands (9-0)
through (6-0) were detected in the antisolar direction extending <
100" from the coma over the spectral range 500-720 nm at 1.5-nm
resolution. The spectra were recorded with slit orientations at
p.a. 77.0, 84.5 and 85.1 on the three nights, respectively. He
adds that direct images (in B and R) were also obtained with the
Kitt Peak No. 1 0.91-m telescope and RCA CCD on Feb. 24.1 and Mar.
3.1 by W. Romanishin and M. Sitko. On the first night two 60-s
integrations were obtained. The Mar. 3.1 images (120-s integrations)
showed a weaker plasma tail at ~ p.a 85 and a very weak
tail-like feature at p.a 30 in R. The B images were symmetrical
on both Feb. 24 and Mar. 3.
Total visual magnitude estimates: Mar. 8.03 UT, 8.4 (J.
Bortle, Stormville, NY, 20 x 80 binoculars); 11.18, 8.7 (C. S.
Morris, Whitaker Peak, CA, 0.20-m reflector).
PERIODIC COMET WILD 2 (1983s)
Wehinger and his colleagues using the KPNO 4-m reflector note
that on Jan. 4 and Mar. 4 this comet had a well-developed dust coma
with tail structure oriented in p.a. 96. Spectra on both nights
showed a strong continuum. [O I] 630 nm was detected on Jan. 4.
Photometry on Mar. 4 gave V = 14.4 (total) and 17.7 (nuclear).
1984 March 13 (3927) Brian G. Marsden
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