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IAUC 2878: SN IN NGC 3583; SMC X-1; 3U 0352+30; 1975n

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                                                  Circular No. 2878
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.

     C. Kowal, Hale Observatories, reports the discovery, with the
46-cm Schmidt telescope at Palomar, of a supernova in NGC 3583 (R.A. =
11h11m.3, Decl. = +48o36', equinox 1950.0), 51" east and 37" south of
the nucleus.  The photographic magnitude was 15.0 on Dec. 1 UT.

     R. Lucke, D. Yentis, H. Friedman, G. Fritz and S. Shulman,
Naval Research Laboratory, have observed x-ray pulsations in SMC
X-1 (3U 0115-73) similar to those found in Her X-1 and Cen X-3.
The pulse period is 0.716 +/- 0.001 s, and the profile is double with
a very strong interpulse.  Pulsations were observed on 1973 Nov.
12d14h52m UT during an Aerobee rocket flight from Woomera and on
1975 July 20d18h50m UT with the Apollo x-ray instrument during the
Apollo-Soyuz mission.  In 1973, 40 s of data were obtained at
binary phase 0.83 +/- 0.03, and in 1975, 190 s of data at phase 0.88
+/- 0.05.  In the energy range 2-10 keV the pulsed fraction is about
30 percent in both observations, and the source is observed in the
1-2 keV range with a pulsed fraction of 5-10 percent.

3U 0352+30
     N. V. Vidal and I. Kupo, Wise Observatory, write: "Image-tube
spectra (dispersion 250 A/mm) of the twelfth-magnitude star ADS
2859B suggested by Haupt and Moffat (1973, Astrophys. Lett. 13, 77)
as a T Tau star and a possible candidate for 3U 0352+30 show an
ordinary early M-type spectrum with the usual TiO bands.  No emission
lines are found.  This leaves X Per as the primary candidate
for 3U 0352+30 (cf. IAUC 2854, 2869)."

COMET WEST (1975n)
     D. Herald, Kambah, near Canberra, communicates the following
scaled position, derived from a very faint, trailed image photographed
with a 31-cm reflector:

     1975 UT             R. A. (1950) Decl.         m1
     Nov. 23.44306    20 23 41.2    -39 29 58      12-13

1975 December 4                (2878)              Brian G. Marsden

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