Central Bureau for Astronomical Telegrams
IAUC 2229: 1969i; SN IN IC 3476
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Read IAUC 2230
Circular No. 2229
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. Mag. Observer
Jan. 6.04075 0 31 07.06 -64 31 49.1 Potter
11.05195 0 14 44.98 -63 29 47.1 "
12.07907 0 11 46.85 -63 16 35.8 "
13.04437 0 08 52.65 -63 03 03.3 "
14.05062 0 06 02.31 -62 49 12.2 "
15.04441 0 03 18.76 -62 35 17.7 "
16.08039 0 00 32.91 -62 20 33.4 "
18.04512 23 55 31.81 -61 52 05.4 "
29.03548 23 31 30.74 -59 01 04.2 "
31.04113 23 27 40.48 -58 27 44.8 "
Feb. 1.03932 23 25 48.38 -58 10 51.3 "
2.03308 23 23 58.04 -57 53 52.2 "
3.03379 23 22 08.37 -57 36 29.7 "
4.03451 23 20 19.71 -57 18 55.0 "
6.02902 23 16 45.46 -56 43 04.1 "
7.02975 23 14 58.72 -56 24 35.2 "
8.02701 23 13 12.72 -56 05 52.7 "
9.02910 23 11 26.48 -55 46 42.2 "
10.02840 23 09 40.41 -55 27 10.2 "
11.02772 23 07 54.30 -55 07 08.5 "
12.02982 23 06 07.43 -54 46 34.6 "
13.02846 23 04 20.50 -54 25 32.6 "
14.02778 23 02 32.81 -54 03 53.2 "
15.02641 23 00 44.45 -53 41 34.8 "
16.02649 22 58 54.90 -53 18 27.2 "
17.02575 22 57 04.55 -52 54 31.9 "
18.02508 22 55 12.99 -52 29 41.2 "
Mar. 18.40017 22 04 24.52 -20 44 57.8 0.5 Rodriguez
18.40090 22 04 24.29 -20 44 50.3 "
21.38762 22 03 56.71 -12 46 58.5 0.5 Pereyra
21.38831 22 03 56.69 -12 46 50.5 "
21.38900 22 03 56.82 -12 46 44.0 "
22.83698 22 04 32.1 - 8 34 19 -0.5 Seki
22.84398 22 04 32.6 - 8 33 06 "
H. Potter and A. Lokalov (National Observatory, Santiago). Cerro
El Roble station; Maksutov astrograph. Measurer: C. Torres;
Computer: H. Wroblewski.
J. J. Rodriguez and Z. M. Pereyra (Cordoba Observatory for the
CNEGH). 33-cm astrograph. Measurer: Miss B. Oviedo. Objective
prism spectra of both head and tail show strong continuum and
emission. The curved dust tail, 10o long, shows filaments
extending along the prolongation of the radius vector.
T. Seki (Kochi Observatory). 22-cm f/5 camera. Tail > 5o.
Mr. J. C. Bennett, Pretoria, writes that on March 20.1 the
tail could be traced with the naked eye to at least 11o; on March
28.1 the tail was traced to more than 6o in spite of poor conditions.
On March 22.1 the magnitude of the central condensation was
estimated as 1.0, and in an 8-cm refractor (magnification up to
227 x) short faint jets were seen radiating from it on the sunward
side. A guided 20-min exposure taken at the same time by K. J.
Sterling shows a straight gas tail that is almost as prominent as
the dust tail and which can be followed for some 20o.
Mr. K. Simmons, Jacksonville, Florida, writes that on March
25.5 the magnitude (7 x 50 binoculars) was 1.6. A central condensation,
of magnitude 6.0, and 0'.2 to 0'.4 in diameter, was observed
with a 21-cm reflector; the coma was 5' in diameter, the
brightest portion about 2'.5. A fan-shaped tail, 2o.5 long as seen
with the naked eye, curved to p.a. 225o (near the coma in p.a.
215-220o); there was a 2' counter tail at p.a. 90o and jets at p.a. 75o
and 105o.
Mr. D. Li, Honolulu, describes orange "pin-wheel" streamers
that on March 26.6 appeared to come out of the western arc of the
head envelope and sweep around to the east. The comet's total
magnitude was 0.0, a magnitude fainter than the previous morning.
Mr. J. E. Bortle, Mount Vernon, New York, reports that on
March 28.4 the comet was of magnitude 0.5, with a brilliant central
condensation of magnitude 1.7. The curved tail extended about 5o
in the brightly moonlit sky. Fountain-type jets extended from the
nucleus, and the appearance was very similar to that of comet 1861
II, as depicted by Secchi and by Schmidt.
SUPERNOVA IN IC 3476
Mr. K. Locher, Wetzikon, Switzerland, sends the following
visual estimates (from comparison with nearby MVSO sequences):
1970 UT V
Mar. 28.88 13.6 +/- 0.2
30.85 13.8 +/- 0.2
1970 April 6 (2229) Brian G. Marsden
Read IAUC 2230
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