Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 7630: 2001bq; C/2001 A2

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 7629  SEARCH Read IAUC 7631

View IAUC 7630 in .dvi or .ps format.
IAUC number

                                                  Circular No. 7630
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVA 2001bq IN NGC 5534
     E. Cappellaro, Osservatorio Astronomico di Padova; and
A. Harutyunyan, Byurakan Astrophysical Observatory,
report: "A spectrum of SN 2001bq was obtained on May 19.98 UT
with the Asiago 1.8-m telescope + AFOSC (range 350-740 nm, resolution
2.5 nm).  This shows a blue continuum and broad P-Cyg H-alpha and H-beta
features, indicating that the supernova is of type II near maximum.
Adopting the NASA/IPAC Extragalactic Database (NED) recession velocity for
NGC 5534 of 2633 km/s yields a supernova expansion velocity of about
11 000 km/s."

     T. Matheson, S. Jha, P. Challis and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum of SN 2001bq, obtained
by P. Berlind on May 20.18 UT with the F. L. Whipple Observatory 1.5-m
telescope (+ FAST spectrograph), shows it to be a type II supernova
near maximum light.  The spectrum consists of a very blue continuum
with superposed P-Cyg lines of hydrogen and helium.  The above NED
recession velocity for NGC 5534 yields the supernova's expansion velocity
(derived from the minimum of the H-beta line) as 9200 km/s.

     Z. Sekanina, Jet Propulsion Laboratory, writes: "Astrometric offsets of
component A from B reported between Apr. 30 and May 18 (IAUC 7616, 7625,
7627, MPC 42656, MPEC 2001-K14) indicate that the splitting occurred on
Mar. 29.9 +/- 1.6 UT (thus coinciding with the major outburst) and that
the companion's relative deceleration is 15.2 +/- 0.7 units of 10**-5
solar attraction.  Predicted separations and position angles: May 21,
19", 110 deg; 26, 28", 115 deg; 31, 39", 121 deg; June 5, 54", 128 deg;
10, 74", 136 deg; 15, 97", 145 deg; 20, 122", 156 deg.  Assuming
that the separation of component C (IAUC 7627) from B coincided with the
outburst of May 11, the single available offset suggests that C is subjected
to a deceleration of approximately 40 units of 10**-5 solar attraction.
Preliminary predicted ephemeris: May 21, 3", 138 deg; 26, 8",
142 deg; 31, 16", 148 deg; June 5, 29", 154 deg."

     Total visual magnitude estimates: May 16.96 UT, 5.3 (V. A. Buso, Rosario,
Argentina, 0.06-m reflector); 17.90, 5.3 (W. Souza, Sao Paulo, Brazil,
11 x 80 binoculars); 19.89, 5.2 (Souza, 8 x 30 binoculars); 21.44, 5.4
(A. Pearce, Nedlands, Western Australia, 20 x 80 binoculars); 22.46, 5.2
(Pearce).  D. A. J. Seargent, Cowra, New South Wales (25 x 100 binoculars),
writes that on May 14.4 UT there was a narrow ion tail, intense for about
1 degree, traced for approximately 4 deg in p.a. 133 deg; on May 15.4 a
diffuse "cloud" was visible, detached from the tail, at about 1.5 deg from
the coma.

                      (C) Copyright 2001 CBAT
2001 May 22                    (7630)              Brian G. Marsden

Read IAUC 7629  SEARCH Read IAUC 7631

View IAUC 7630 in .dvi or .ps format.

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

Valid HTML 4.01!