Central Bureau for Astronomical Telegrams
IAUC 2267: omicron Cet; NEW ERUPTIVE Var; 1970g; 1970d
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Read IAUC 2268
Circular No. 2267
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
omicron CETI
Mrs. Margaret W. Mayall, AAVSO, informs us that recent
observations by D. W. Rosebrugh suggest that Mira Ceti is unusually
faint at its current maximum. The visual magnitude was 5.4 on July
7.4 and 4.7 on July 17.4. Maximum is predicted for July 23.
NEW ERUPTIVE VARIABLE
Mr. Paul Wild, Astronomical Institute, Berne, writes that he
discovered in March a stellar object of magnitude 14 at R. A. =
13h45m57s, Decl. = -30o53'.7 (equinox 1950.0). This position is 48"
north-northeast of the center of a small, edge-on spiral galaxy
(diameter 0'.9) belonging to a fairly rich cluster. He was unable
to confirm the object, but Dr. J. L. Sersic, Cordoba Observatory,
succeeded in photographing a faint object at this position in July.
Mr. Wild was also able to locate it on the Palomar Sky Survey
charts; he sunvnarizes the rough magnitude information as follows:
Mag.
1958 Apr. 19 20-21 Palomar charts; just visible, clearly
1968 Apr. 21 > 17 Berne-Zimmerwald (invisible)
1970 Mar. 10 13.5-14 Berne-Zimmerwald
Apr. 6 > 17 Berne-Zimmerwald (invisible)
July 4 - 18 Cordoba
COMET ABE (1970g)
The following precise positions have been reported:
1970 UT R. A. (1950) Decl. Mag. Observer
July 5.77773 2 18 22.60 +24 15 15.4 10 Seki
6.76120 2 18 37.15 +24 37 48.8 "
7.0828 2 18 41.58 +24 45 15.9 Wild
9.91458 2 19 15.60 +25 53 25.8 Harwood
10.92951 2 19 25.63 +26 18 54.9 Harris
11.0748 2 19 27.13 +26 22 30.9 Wild
11.88299 2 19 33.82 +26 43 29.9 Candy
11.89236 2 19 33.88 +26 43 43.5 "
13.89062 2 19 46.88 +27 37 08.4 Birch
13.90000 2 19 46.81 +27 37 22.7 "
14.0833 2 19 47.91 +27 42 20.0 Wild
14.76910 2 19 50.65 +28 01 27.0 Seki
14.78368 2 19 50.87 +28 01 46.8 "
15.75121 2 19 53.4 +28 29 20 11 "
T. Seki (Kochi Observatory). Comet image faint on July 15.
P. Wild (Astronomical Institute, Berne). 40-cm Schmidt, Zimmerwald.
D. Harwood, B. J. Harris, M. P. Candy and P. V. Birch (Perth
Observatory, Bickley). 33-cm f/10 astrograph.
The following parabolic orbits have been calculated. The
ephemeris is from the second one, but it could be in error by more
than half a degree by September
M. P. Candy B. G. Marsden
(12 obs. July 5-13) (20 obs. July 5-15)
T = 1970 Oct. 21.471 1970 Oct. 20.946 ET
Peri. = 96.115 96.419
Node = 20.960 20.985 1950.0
Incl. = 126.068 126.500
q = 1.12434 1.11648 AU
1970 ET R. A. (1950) Decl. Delta r Mag.
July 28 2 17.50 +35 32.5
Aug. 2 2 14.07 +39 18.7 1.431 1.674 8.0
7 2 08.07 +43 48.3
12 1 57.81 +49 11.6 1.163 1.568 7.3
17 1 39.75 +55 37.1
22 1 05.45 +63 00.1 0.946 1.466 6.5
27 23 52.3 +70 24.3
Sept. 1 21 22.9 +74 08.7 0.824 1.372 6.0
6 18 49.59 +69 39.9
11 17 32.71 +60 31.2 0.839 1.288 5.7
PERIODIC COMET D'ARREST (1970d)
Dr. Elizabeth Roemer, University of Arizona, and Dr. T. C.
Owen, California Institute of Technology, report that an image-tube
spectrogram of this comet was obtained by Dr. R. E. White with the
229-cm Steward Observatory reflector, Kitt Peak, on July 10.4 UT.
The most prominent feature of the spectrum was CN 3883 A. C3 4050 A,
C2 5165 A, 4737 A, and tentatively CH 4281 A and OH 3090 A were also
identified; and there was a weak continuum.
Mr. T. Seki, Kochi, provides the following precise positions:
1970 UT R. A. (1950) Decl. Mag.
July 15.77760 3 31 33.46 + 7 15 39.6 11
15.78889 3 31 35.05 + 7 15 43.4
1970 July 24 (2267) Brian G. Marsden
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