Central Bureau for Astronomical Telegrams
IAUC 4230: COMETS 1981 XXI (SOLWIND 4) AND 1984 XII (SOLWIND 5); 1986G
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Read IAUC 4231
Circular No. 4230
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
COMETS 1981 XXI (SOLWIND 4) AND 1984 XII (SOLWIND 5)
The values of R.A. and Decl. on IAUC 4129 were calculated on the
erroneous assumption that the origin of O was the terrestrial, rather
than the solar, north pole. Corrected values follow:
UT R.A. (1950.0) Decl. 1984 UT R.A. (1950.0) Decl.
1981 Nov. 3.999 14 25.7 -16 59 July 28.316 8 22.2 +18 33
4.038 14 26.5 -16 51 28.324 8 22.2 +18 34
4.105 14 28.1 -16 42 28.331 8 22.7 +18 38
4.171 14 29.6 -16 34 28.368 8 24.0 +18 44
4.238 14 31.2 -16 23 28.375 8 24.3 +18 46
4.304 14 32.4 -16 11 28.383 8 24.5 +18 47
4.371 14 34.0 -16 00 28.390 8 24.7 +18 49
28.397 8 25.1 +18 50
1984 July 28.302 8 21.8 +18 30 28.435 8 26.5 +18 59
28.309 8 22.0 +18 32 28.443 8 26.6 +18 59
The additional rotation by 24 deg on 1981 Nov. 3-4 effectively
increases the orbital inclination of SOLWIND 4 by that same amount,
so, contrary to the remark on IAUC 4129, membership of that comet
in the Kreutz group now becomes a very distinct possibility. The
adjustment on 1984 July 28 is by only 9 deg, and the earlier suggestion
of Kreutz membership is still supported. Revised and representative
Kreutz-type orbits have been derived by the undersigned
as follows: for SOLWIND 4, T = 1981 Nov. 4.54 ET, Peri. = 78.70, Node =
358.33, Incl. = 144.00 (equinox 1950.0), q = 0.0047 AU; for SOLWIND 5,
T = 1984 July 28.49 ET, Peri. = 72.96, Node = 351.19, Incl. = 142.92
(equinox 1950.0), q = 0.0057 AU.
SUPERNOVA 1986G IN NGC 5128
G. Meurer telexes photometric data (Cousins system) obtained
with the Siding Spring 2.3-m telescope. A 15" aperture was used,
although the June 2 and 4 data have been corrected to an effective
aperture of 40"; the correction amounts to 0.01 in V but is negligible
in the colors. Sky measurements were offset by 20" south on
June 2 and both 20" south and 20" east on June 4 and 5. Errors do
not include galaxy subtraction and are +/- 0.01 except as noted:
June 2.624 UT, V = 13.00, U-B = +0.95 (+/- 0.04), B-V = +1.95, V-R =
+0.85, V-I = +1.64; 4.556, 13.13, +0.93 (+/- 0.03), +1.86, +0.82,
+1.61; 5.569, 13.21 (+/- 0.02), +0.92 (+/- 0.02), 1.84, +0.80, +1.60.
1986 June 25 (4230) Brian G. Marsden
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