Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 2267: omicron Cet; NEW ERUPTIVE Var; 1970g; 1970d

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).


Read IAUC 2266  SEARCH Read IAUC 2268
IAUC number


                                                  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

Read IAUC 2266  SEARCH Read IAUC 2268


Our Web policy. Index to the CBAT/MPC/ICQ pages.


Valid HTML 4.01!