Central Bureau for Astronomical Telegrams
IAUC 4179: 1982i; 1986A
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Circular No. 4179
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
PERIODIC COMET HALLEY (1982i)
R. Gehrz, University of Minnesota, reports the following
preliminary infrared magnitudes, obtained with the 2.3-m Wyoming
Infrared Telescope: Jan. 11.9 UT (5"0 beam, 18" throw): [2.3 microns] =
7.56, [3.6 microns] = 5.02, [4.9 microns] = 2.80, [8.7 microns] = 0.72,
[10.0 microns] = 1.24; N = 1.14, [11.4 microns] = 1.61, [12.6 microns] =
1.46, Q = 2.41, [23 microns] = 2.45; Jan. 12.9 (5"0 beam, 18" throw):
6.80, 4.18, 2.10, 1.06, 1.91, 1.49, 2.15, 2.12, 3.13, 3.48; Feb. 9.83 (8"3
beam, 18" throw): 4.33, 1.58, 0.28, 2.54, 3.84, 3.01, 3.71, 3.46, -,
4.55; Feb. 11.88 (8"3 beam, 20" throw): 3.80, 1.25, 0.54, 2.73, 3.94,
3.20, 3.63, 3.64, 4.56, 4.72. The 10-micron and 20-micron silicate
emission features are present on all dates.
W. E. Celnik, R. Schulz and K. Weissbauer, European Southern
Observatory, report tail lengths on Feb. 18.4 UT of 34' in integrated
light and 13' in CO+ (426 nm); the outer coma, of diameter
2'7, was limited in the solar direction by a bright, narrow, parabolic
bow shock. On Feb. 19.4 the tail, more than 58' long in red
light, was split into four narrow antisolar subtails and a broad
unstructured antitail eastward; the outer coma was 4'3 in diameter,
and the bow shock more intense than on Feb. 18; in CN (388 nm) the
coma appeared diffuse and showed a short antisolar jet tail. H.
Pedersen, B. Gelly and R. M. West report that the addition of four
ESO wide-field CCD frames on Feb. 20.39 showed the following
multiple tail structure: 1A, 100' long in p.a. 270, bifurcated at
70' from the head; 1B, 110' long in p.a. 275; 2, 90' in 280,
strong and narrow; 3, 80' in 290, somewhat weaker and narrow; 4A,
90' in 315, bifurcated at 70'; 4B, 100' in 320, weaker; 5, 90'
in 340, broad and diffuse; 6, > 70' in 3-30, very broad, masked
by horizon; 7, 15' in 65, sharply defined edge.
Total visual magnitude estimates: Feb. 15.13 UT, 3.8 (R.
Fleet, Harare, Zimbabwe, 11 x 80 binoculars); 15.51, 3.5 (P.
Maley, Houston, TX, 0.13-m refractor); 16.12, 3.6 (Fleet); 19.13,
2.8 (Fleet; tail 0.7 deg in p.a. 285P); 19.87, 3.5 (T. Seki, Geisei,
Japan, 0.09-m refractor; tail 3 deg long); 20.56, 2.5 (J. Young,
Table Mountain Observatory, 0.61-m reflector).
SUPERNOVA 1986A IN NGC 3367
D. Herald, Canberra, has measured the following precise position
from an exposure by P. Anderson, Brisbane: R.A. = 10h43m57s52, Decl.
= +14deg00'49"7 (equinox 1950.0).
1986 February 20 (4179) Brian G. Marsden
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