Central Bureau for Astronomical Telegrams
IAUC 5189: 1991g; 1986 III
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Circular No. 5189
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
COMET McNAUGHT-RUSSELL (1991g)
The following precise positions have been reported:
1991 UT R.A. (1950) Decl. m1 Observer
Jan. 26.71715 11 23 43.87 -25 29 12.5 McKenzie
Feb. 13.59457 11 08 43.13 -22 43 19.9 17.5 Gilmore
13.66755 11 08 38.98 -22 42 31.7 "
14.48740 11 07 53.12 -22 33 17.9 McNaught
15.53275 11 06 54.00 -22 21 17.1 "
P. McKenzie and R. H. McNaught (Siding Spring). Uppsala Southern
Schmidt, except prediscovery Jan. 26 U.K. Schmidt Telescope plate.
A. C. Gilmore and P. M. Kilmartin (Mt. John University Observatory).
Preliminary parabolic elements from 8 observations, Jan. 26-Feb. 15:
T = 1990 Oct. 14.427 ET Peri. = 320.384
Node = 161.034 1950.0
q = 4.77030 AU Incl. = 113.386
1991 ET R.A. (1950) Decl. Delta r m1
Feb. 13 11 09.27 -22 50.0 4.090 4.865 16.4
18 11 04.54 -21 52.1
23 10 59.67 -20 49.0 4.018 4.881 16.4
28 10 54.73 -19 41.4
Mar. 5 10 49.79 -18 29.6 3.982 4.898 16.4
PERIODIC COMET HALLEY (1986 III)
O. Hainaut, A. Smette, European Southern Observatory, La Silla;
and R. M. West, ESO, Garching, report: "CCD V photometry with the
1.54-m Danish telescope at La Silla (seeing about 1".3) indicates a
major eruptive event at r = 14.3 AU. Preliminary V magnitudes:
Feb. 12.3 UT, 21.4; 13.2, 21.8; 14.2, 21.9 (5" circular aperture,
centered on light peak); the variation is within the photometric
uncertainty. This compares to predicted mean m2 about 25.3 of the
nucleus alone. The light peak is near the northwest edge of a
diffuse, elliptically-shaped coma with major axis in the northeast-
southwest direction; it measures > 20" across (projected 200 000 km)
and m1 about 19. Inspection of a V frame obtained with the 3.5-m
New Technology Telescope on Feb. 15.2 does not show any apparent
change."
1991 February 15 (5189) Daniel W. E. Green
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