Central Bureau for Astronomical Telegrams

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IAUC 6609: 1997bm; 1997bl; C/1995 O1

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                                                 Circular No. 6609
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1997bm IN IC 705
     J. Mueller reports her discovery of a supernova (mag about 18)
on an IV N plate taken on Mar. 18 by K. M. Rykoski and J. D.
Mendenhall with the 1.2-m Oschin Schmidt Telescope in the course of
the second Palomar Sky Survey.  SN 1997bm is located 8" east and
13".4 north of the center of IC 705 (R.A. = 11h32m.9, Decl. =
+50o14', equinox 2000.0).  A spectrogram obtained by W. Sargent and
A. Baker on Mar. 30 at the 5-m Hale telescope (+ double
spectrograph) indicates this to be a probable type-I supernova.


SUPERNOVA 1997bl IN ANONYMOUS GALAXY
     Further to the report on IAUC 6605, D. Hardin reports that the
supernova is located 2" northwest of the host galaxy's center.
EROS is an acronym for "Experience de Recherche d'Objets Sombres",
which searches for microlensing events and for supernovae.


COMET C/1995 O1 (HALE-BOPP)
     H. Matthews, Joint Astronomy Centre (JAC), Hilo, and National
Research Council of Canada; W. Holland, JAC; and R. Meier and D.
Jewitt, University of Hawaii, report the first images of C/1995 O1
obtained with the SCUBA bolometer array at the James Clerk Maxwell
Telescope on Mauna Kea:  "Images taken at 850 microns on Mar. 30.92
UT show an approximately spherical coma that is extended relative
to the 14" diffraction-limited resolution.  Preliminary flux
densities within synthetic apertures of projected diameters 14" and
60" are 720 +/- 50 and 2180 +/- 200 mJy, respectively,
corresponding to equivalent blackbody cross-sections 2.5 +/- 0.2
and 7.7 +/- 0.7 x 10E4 K kmE2 at assumed temperature 300 K.  The
surface-brightness profile appears slightly steeper than expected
on the basis of steady-state ejection.  The inferred central excess
(210 mJy) places a strong upper limit of 49 km to the radius of the
nucleus."
     Naked-eye m1 estimates:  Mar. 19.46 UT, -0.6 (G. W. Kronk,
Troy, IL); 22.14, -0.7 (R. J. Bouma, Groningen, The Netherlands);
25.03, -0.3 (J. Bortle, Stormville, NY, strong moonlight); 26.81,
-1.2 (K. Cernis, Zirmunai, near Vilnius, Lithuania); 27.85, -1.5 (A.
Pereira, Cabo da Roca, Portugal); 29.87, -0.5 (H. Luethen, Telmer,
Germany); 30.84, -0.3 (J. D. Shanklin, Cambridge, England); 31.85,
-1.0 (J. Carvajal, Guadalajara, Spain); Apr. 1.80, -0.8 (M. V.
Zanotta, Milan, Italy).

                      (C) Copyright 1997 CBAT
1997 April 2                   (6609)            Daniel W. E. Green

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