Central Bureau for Astronomical Telegrams
IAUC 5059: 1986 III; 1990g; R CrB; 1990f
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Read IAUC 5060
Circular No. 5059
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
PERIODIC COMET HALLEY (1986 III)
R. M. West, European Southern Observatory, communicates: "CCD
observations at heliocentric distance r = 12.5 AU on 1990 Feb. 21-
24 with the Danish 1.5-m telescope at La Silla, totalling 980 min
in Johnson V, show brightness variations between V = 23.7 and 25.0;
the mean value is 24.4 +/- 0.1, corresponding to V(1,1,0) = 13.55,
or 0.35 mag brighter than what is expected from the nucleus alone.
The extended coma observed at r = 10.1 AU (West 1990, A.Ap. 228,
531) has disappeared, and no coma is visible at the 29 mag/arcsec2
level. While the dust release has therefore ceased somewhere in the
indicated r-interval, the image appears somewhat elongated toward
the east and a low level of activity may still persist."
COMET McNAUGHT-HUGHES (1990g)
Improved parabolic orbital elements from MPC 16684:
T = 1991 Feb. 27.7269 ET Peri. = 18.1570
Node = 232.5057 1950.0
q = 2.683144 AU Incl. = 132.7863
1990 ET R.A. (1950) Decl. Delta r m1
July 28 15 31.83 -53 20.4 2.915 3.470 16.7
Aug. 7 15 19.09 -49 23.2
17 15 11.70 -45 42.1 3.112 3.348 16.7
27 15 08.24 -42 23.6
Sept. 6 15 07.67 -39 29.2 3.359 3.233 16.7
16 15 09.22 -36 57.7
26 15 12.38 -34 46.6 3.595 3.125 16.7
R CORONAE BOREALIS
Visual magnitude estimates by J. Shanklin, Cambridge, England
(cf. IAUC 5024): June 1.04 UT, 6.3; 24.00, 6.2; July 17.98, 6.2;
24.96, 6.2.
PERIODIC COMET HONDA-MRKOS-PAJDUSAKOVA (1990f)
Total visual magnitude estimate by A. Pearce, Scarborough, W.A.
(0.26-m reflector): July 24.89 UT, 12.4 (coma diameter 2'.5).
1990 July 25 (5059) Daniel W. E. Green
Read IAUC 5060
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