Central Bureau for Astronomical Telegrams
IAUC 7630: 2001bq; C/2001 A2
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Circular No. 7630
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)
CBAT@CFA.HARVARD.EDU (science)
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.
COMET C/2001 A2 (LINEAR)
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
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