Central Bureau for Astronomical Telegrams
IAUC 4404: 1987p; 1987A; N Sgr 1987
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 4405
Circular No. 4404
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
PERIODIC COMET BORRELLY (1987p)
A. C. Gilmore and P. M. Kilmartin, Mount John University
Observatory, report their recovery of this comet as follows:
1987 UT R.A. (1950) Decl. m2
June 5.72721 0 33 04.49 -29 08 06.5 19
5.76182 0 33 08.25 -29 08 03.0
7.75257 0 36 55.50 -29 06 01.4 19
The object is diffuse with condensation and precisely in the
position predicted on MPC 11527 (elements MPC 10522).
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
J. A. Bailey, R. D. Cannon and M. S. Cropper, Anglo-Australian
Observatory, telex: "We obtained CCD spectropolarimetry (resolution
0.15 nm, typical accuracies about 0.05 percent) on May 5 and June 3.
Extensive structure in the polarization spectrum is now present.
Polarization peaks with typical widths of 3-5 nm (FWHM) are associated
with the absorption troughs or just blueward of the emission
peaks. The main features observed on June 3 in observations covering
544-686 and 822-905 nm are as follows: 586.0 nm, peak polarization
1.0 percent in p.a. 5 deg; 611.0, 0.8 in 100; 645.0, 2.2 in 15;
651.5, 1.1 in 20; 838.0, 3.4 in 105. The main peaks in polarized
flux (as opposed to percentage polarization) are at 588.0,
655.0 and 866.5 nm and have FWHM of 5-7 nm. The continuum polarization
dropped from about 0.5 percent on May 5 to about 0.1 percent on
June 3. The polarization features associated with H alpha decreased in
width and increased in strength from May 5 to June 3."
Visual magnitude estimates: June 3.34 UT, 3.2 (D. A. J.
Seargent, The Entrance, N.S.W.); 4.56, 3.3 (R. H. McNaught,
Coonabarabran, N.S.W.); 5.79, 3.1 (McNaught); 6.39, 3.2 (A.
Beresford, Adelaide, S. Australia); 7.36, 3.3 (Beresford).
NOVA SAGITTARII 1987
Visual magnitudes: May 29.45 UT, 11.2 (D. A. J. Seargent, The
Entrance, N.S.W.); 30.42, 11.3 (Seargent); June 1.10, 10.9 (A.
Pereira, Linda-A-Velha, Portugal); 2.40, 11.6 (Seargent); 3.39, 11.7
(Seargent); 4.81, 11.3 (R. H. McNaught, Coonabarabran, N.S.W.);
5.44, 11.6 (McNaught); 6.81, 11.5 (McNaught).
1987 June 8 (4404) Brian G. Marsden
Read IAUC 4405
Our Web policy. Index to the CBAT/MPC/ICQ pages.
