Central Bureau for Astronomical Telegrams
IAUC 2232: 1969i
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Read IAUC 2233
Circular No. 2232
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 BENNETT (1969i)
The following precise positions have been reported:
1970 UT R. A. (1950) Decl. Observer
Jan. 20.55208 23 49 29.14 -61 14 43.4 Harris
20.55660 23 49 28.54 -61 14 39.6 "
28.54132 23 32 28.58 -59 09 09.3 Candy
28.54549 23 32 28.06 -59 09 05.7 "
29.52778 23 30 33.37 -58 52 55.6 "
29.53125 23 30 33.02 -58 52 52.4 "
30.56597 23 28 34.29 -58 35 40.8 Nikoloff
30.56944 23 28 33.92 -58 35 37.1 "
Feb. 7.55139 23 14 03.09 -56 14 48.8 Gans
7.55486 23 14 02.62 -56 14 45.0 "
10.50972 23 08 49.27 -55 17 34.5 Candy
10.51389 23 08 48.81 -55 17 29.6 "
11.50799 23 07 03.12 -54 57 20.6 Nikoloff
11.51076 23 07 02.79 -54 57 16.5 "
14.50903 23 01 40.59 -53 53 12.8 Gans
14.51250 23 01 40.28 -53 53 08.0 "
17.51527 22 56 09.98 -52 42 28.8 Harris
17.51874 22 56 09.68 -52 42 23.6 "
19.51111 22 52 24.68 -51 50 52.9 Candy
19.51476 22 52 24.30 -51 50 48.4 "
20.49861 22 50 31.28 -51 23 41.6 Nikoloff
20.50208 22 50 30.97 -51 23 36.0 "
23.50764 22 44 37.47 -49 52 32.6 Andruszkiw
23.51111 22 44 36.94 -49 52 25.9 "
24.50347 22 42 37.34 -49 19 07.4 Harris
24.50694 22 42 36.72 -49 19 00.9 "
Mar. 4.48368 22 26 01.22 -43 24 36.4 Nikoloff
4.48646 22 26 00.79 -43 24 28.2 "
9.88906 22 15 15.98 -37 06 43.1 Harris
9.89097 22 15 15.69 -37 06 33.2 "
12.87986 22 10 13.24 -32 24 02.8 Candy
12.88299 22 10 12.97 -32 23 44.0 "
22.89896 22 04 34.07 - 8 23 05.8 "
22.90069 22 04 34.12 - 8 22 47.4 "
Apr. 1.16528 22 21 10.69 +19 36 04.0 Muller
1.16806 22 21 11.21 +19 36 32.6 "
2.14375 22 24 06.48 +22 15 37.2 "
2.16316 22 24 10.66 +22 18 40.0 Milet
2.16489 22 24 11.40 +22 18 48.4 "
3.13799 22 27 16.90 +24 50 59.5 "
3.13876 22 27 17.01 +24 51 09.8 "
3.13948 22 27 17.25 +24 51 13.3 "
3.14030 22 27 17.60 +24 51 20.4 "
3.14111 22 27 17.76 +24 51 29.3 "
3.14243 22 27 17.82 +24 51 41.7 "
6.12491 22 37 49.24 +31 55 00.9 "
6.12564 22 37 49.49 +31 55 06.9 "
6.12635 22 37 49.76 +31 55 13.3 "
6.12708 22 37 49.91 +31 55 18.3 "
6.12782 22 37 50.15 +31 55 25.2 "
6.13493 22 37 51.66 +31 56 11.6 "
6.15814 22 37 56.56 +31 59 23.7 "
B. J. Harris, M. P. Candy, I. Nikoloff, D. Gans and I. Andruszkiw
(Perth Observatory, Bickley). 33-cm f/10 astrograph.
P. Muller (Nice Observatory). Satellite-tracking camera Antares.
B. Milet (Nice Observatory). On April 2 there was a very strong
condensation of visual magnitude 1.5 and a sharply curved tail
of more than 8o. The positions on April 3 are from exposures of
durations 10, 20, 30, 40, 50 and 60 seconds, respectively.
Dr. K. Wurm writes: "Drs. P. L. Bernacca and A. Mammano,
Asiago Astrophysical Observatory, are undertaking a photographic
and spectroscopic program on the comet. On March 28, 29, April 3,
4 and 5 a total of 25 photographs were obtained with the larger
Asiago Schmidt (scale 96"/mm) and with the 122-cm reflector (scale
34"/mm). The comet shows both types of tails. Intensity and
structure of the type I tail vary strongly from day to day, indicating
a very irregular CO+ ion production. The strong type I tail
of April 3, of length more than 250' (limited by the border of the
plate), is separated from the coma by a gap of 65'. The curved
type II tail seems to keep at least approximately its strength and
has on the longer exposures a length of 265' (again limited by the
border of the plate). A spectrum on 103a-0 emulsion shows all the
well-known cometary bands of the region on a very strong continuous
background of scattered solar light. Two spectra in the 1 micron
region, obtained through an image intensifier supplied by the
Carnegie Committee on image tubes, permit with certainty on the
strong continuum only the identification of the (0,0) band of the
infrared CN system at 9148 A. The kindly cooperation of Drs. F.
Ciatti and S. D'Odorico is acknowledged."
1970 April 16 (2232) Brian G. Marsden
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