Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 5340: 1991aw; PERSEID METEORS 1991; 1991t

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 5339  SEARCH Read IAUC 5341
IAUC number

                                                  Circular No. 5340
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

SUPERNOVA 1991aw IN Zw 322-02
     C. Pollas, Observatoire de la Cote d'Azur, reports his discovery
of a possible supernova at R.A. = 17h42m20s.49, Decl. = +67d30'29.3"
(equinox 1950.0), 1".9 west and 9".3 north of the center of the galaxy
Zw 322-02 = KA 155, a spiral galaxy of mpg = 15.4.  The supernova, of
mag about 20, appeared on 4415-emulsion films (limiting mag 21)
obtained with the 0.9-m Schmidt at Caussols on Sept. 4.9 and 5.9 UT.
Nothing is visible on similar films obtained on July 9.0 and June 9.0
UT (to limiting mag 22), and neither is anything on the POSS prints.
The object is near SAO 017612.

     P. Jenniskens, Sterrewacht, Leiden, informs us that meteor counts
by members of the Dutch Meteor Society in the Netherlands and southern
France do not confirm the high counts reported by Belgian observers
(observing only a few km away in southern France) on IAUC 5330; from
European observations he suggests that the Perseid activity this year
was fully comparable to the average of 1981-1989 and that even on Aug.
13.1 UT the properly corrected ZHR was certainly no greater than 100.
Amplifying the remarks attributed to him on IAUC 5330, Y. Taguchi,
Osaka, writes that many amateur astronomers in Japan observed a sharp
and intense maximum, lasting for about 60 min on Aug. 12.7 UT.  The
effect was so sudden and the Perseids so numerous that it was not
possible to count sporadic meteors and determine the ZHR, but the
latter conceivably exceeded 450.  The particular observations
previously reported from Kiso were made by members of the Shinsyu
University Astro OB Club, and during the critical hour there were
eleven meteors observed that were brighter than mag -5.

     Total visual magnitude estimates: Aug. 17.32 UT, 8.2 (V. F.
de Assis Neto, Sao Francisco de Oliveira, Brazil, 10 x 70
binoculars); 19.40, 8.7 (G. W. Kronk, Troy, IL, 0.33-m reflector);
22.07, 8.4 (R. Haver, Monte Autore, Italy, 15 x 80 binoculars);
27.04, 8.6 (B. H. Granslo, Fjellhamar, Norway, 0.20-m reflector);
30.09, 8.4 (S. Korth, Baumberg, Germany, 15 x 80 binoculars);
Sept. 2.12, 8.4 (H. Mikuz, Ljubljana, Yugoslavia, 20 x 60
binoculars); 4.85, 7.8 (A. Pearce, Scarborough, W.A., Australia,
20 x 80 binoculars); 6.07, 8.4 (Mikuz); 8.12, 8.3 (J. D. Shanklin,
Cambridge, England, 20 x 80 binoculars); 9.87, 7.7 (Pearce).

1991 September 10              (5340)              Brian G. Marsden

Read IAUC 5339  SEARCH Read IAUC 5341

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

Valid HTML 4.01!