Central Bureau for Astronomical Telegrams
IAUC 2253: 1970f; 1969f
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Read IAUC 2254
Circular No. 2253
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS
COMET WHITE-ORTIZ-BOLELLI (1970f)
Pilot Emilio Ortiz, Orly, France, writes that his telegraphed
position for the comet (see IAUC 2246) should be interpreted as
sidereal hour angle 285o, declination +15o [D 15 N].
Mr. W. J. H. Fisher, Director of the Carter Observatory,
writes that an independent discovery was made by Stewart on May
23.25 from a point some 110 km north of Wellington; he observed a
bright tail at least 10o long. An observation at the same time by
Albert Jones, Nelson, showed the head to be of magnitude 4, and
there was a slightly curved tail of length 10o in p.a. 120o; on
May 24.25 the tail, in p.a. 115o, appeared as a narrow streamer
near the head, and then became broader and diffuse: "like a spring
onion". On May 30.27 Fisher followed the tail in binoculars for at
least 7o; the magnitude was fainter than 5.
Further positions have been reported as follows:
1970 UT R. A. (1950) Decl. Tail Observer
May 27.95130 5 32 19.40 +11 27 04.5 Bolelli
27.95633 5 32 20.73 +11 26 58.2 "
June 3.343 5 57.4 + 9 30 0o75, p.a. 120o Jones
4.335 6 00.8 + 9 15 127 McMillan
4.338 6 00.7 + 9 14 0.4 120 Jones
5.339 6 03.9 + 9 00 0.3 120 "
6.340 6 06.9 + 8 45 0.1 120 "
7.342 6 09.8 + 8 31 "
C. Bolelli (Cerro Tololo Interamerican Observatory). Measurer:
Mrs. Betty Mintz, U.S. Naval Observatory.
M. V. Jones and S. C. McMillan (Brisbane). On June 7 the comet
appeared only as a faint, ill-defined nebulosity (20-cm reflector,
40x); observing conditions were good, but with some interference
from moonlight. Communicated by V. L. Matchett.
The following parabolic elements, still necessarily uncertain,
satisfy all the accurate positions, except that of May 23.95700,
within 4". The omitted observation gives a residual of 10", but
the cometary image on this plate is damaged.
T = 1970 May 14.557 ET Peri. = 64.925
Node = 340.253 1950.0
q = 0.00981 AU Incl. = 141.055
PERIODIC COMET SLAUGHTER-BURNHAM (1969f)
Dr. G. Sitarski, Institute of Astronomy, Polish Academy of
Sciences, Warsaw, writes: "These elements are based on 14 observations
made in 1958-59 and three made in 1969. The observations are
satisfied very well, the mean residual amounting to +/- 0".87. The
perturbations from Mercury to Neptune were taken into account."
T = 1970 Apr. 13.11062 ET Epoch = 1970 Oct. 21.0 ET
Peri. = 44.24650 e = 0.50416139
Node = 346.09425 1950.0 a = 5.1291854 AU
Incl. = 8.15874 n = 0.08484602
q = 2.54324816 AU P = 11.61643 years
1970/71 ET R. A. (1950) Decl. Delta r Mag.
Aug. 2 5 10.21 +29 34.5 3.212 2.679 17.4
12 5 27.83 +30 08.3 3.138 2.703
22 5 44.56 +30 35.8 3.058 2.729 17.4
Sept. 1 6 00.23 +30 58.2 2.971 2.757
11 6 14.59 +31 17.0 2.879 2.786 17.3
21 6 27.44 +31 33.5 2.784 2.816
Oct. 1 6 38.52 +31 49.3 2.686 2.848 17.3
11 6 47.56 +32 05.8 2.589 2.881
21 6 54.30 +32 24.0 2.494 2.916 17.2
31 6 58.49 +32 44.7 2.404 2.951
Nov. 10 6 59.91 +33 07.4 2.324 2.987 17.2
20 6 58.51 +33 31.0 2.257 3.025
30 6 54.39 +33 53.0 2.209 3.063 17.2
Dec. 10 6 47.94 +34 10.0 2.183 3.102
20 6 39.88 +34 18.9 2.183 3.141 17.3
30 6 31.15 +34 17.5 2.211 3.182
Jan. 9 6 22.81 +34 05.3 2.269 3.223 17.5
19 6 15.78 +33 43.9 2.354 3.264
29 6 10.73 +33 15.9 2.466 3.306 17.8
Feb. 8 6 08.02 +32 44.2 2.600 3.348
18 6 07.73 +32 11.2 2.752 3.391 18.1
28 6 09.73 +31 38.5 2.918 3.434
Mar. 10 6 13.83 +31 06.8 3.095 3.477 18.5
20 6 19.72 +30 36.0 3.278 3.521
30 6 27.15 +30 05.9 3.464 3.565 18.8
Apr. 9 6 35.84 +29 36.0 3.651 3.609
19 6 45.55 +29 05.6 3.834 3.653 19.1
29 6 56.06 +28 34.2 4.013 3.697
May 9 7 07.21 +28 01.2 4.184 3.741 19.4
Mag. = 10.6 + 5 log Delta + 10 log r
1970 June 18 (2253) Brian G. Marsden
Read IAUC 2254
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