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IAUC 8480: 2005ae; 2005ab; C/2004 Q2

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IAUC number

                                                  Circular No. 8480
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 2005ae IN ESO 209-9
     Further to IAUC 8353, R. Martin reports the discovery of an
apparent supernova (mag 17.5) on images taken on Feb. 1.598 and
2.603 UT.  SN 2005ae is located at R.A. = 7h58m15s.84, Decl. =
-49o51'19".9 (equinox 2000.0), which is 13".5 east and 13".9 south
of the center of ESO 209-9 and in an area where there is
substantial background luminosity from the galaxy.  Nothing was
visible at this location on an image taken on Jan. 31.661 (limiting
magnitude g approximately 18.0).  Martin reports the following
magnitudes obtained of the new object on Feb. 8.520:  V = 15.9, R =
15.4, I = 14.7.

SUPERNOVA 2005ab IN NGC 4617
     S. Benetti writes:  "F. Di Mille, Universita di Padova, on
behalf of the 'RTN Winter School on Supernovae' in Asiago, reports
that a noisy spectrum (range 390-815 nm, resolution 2.3 nm) of SN
2005ab (cf. IAUC 8478), taken on Feb. 9.00 UT with the Asiago
1.22-m telescope (+ Boller & Chivens spectrograph), is that of a
type-II supernova shortly after explosion.  The spectrum consists
of a blue continuum overimposed by a relatively broad (5400 km/s)
H_alpha emission line."

     J. H. Sastri and R. Vasundhara, Indian Institute of
Astrophysics, Bangalore, reports that R-band CCD images of comet
C/2004 Q2 were obtained in January by K. Kuppuswamy and C. Velu
with the 1.02-m f/13 telescope at the Vainu Bappu Observatory,
Kavalur, which reveal dust fans via the spatial filter of Larson
and Sekanina (1984, A.J. 89, 571) with the following lengths (+/-
15") and position angles (+/- 10 degrees) for each of the three
fans:  Jan. 2.6625 UT, fan 1, 150" in p.a. 291 deg; fan 2, 150" in
p.a. 252 deg; fan 3, 60" in p.a. 216 deg.  Jan. 15.6344, fan 1,
150" in p.a. 40 deg; fan 2, 150" in p.a. 252 deg; fan 3, 60" in
p.a. 216 deg.  The dust features were modeled after Vasundhara
(2002, A.Ap. 382, 342), indicating that the latitude ranges of the
active regions on the nucleus that produce the fans are as follows
(direction of fitted north rotational pole R.A. = 190 deg +/- 10
deg, Decl. = +50 deg +/- 10 deg, equinox 2000.0):  fan 1, -15 to 0
deg; fan 2, -50 to -35 deg; fan 3, -78 to -70 deg.  Assuming
silicate grains of size 0.1-30 microns and Fulle's (1987, A.Ap.
171, 327) relation between grain velocity and the forces on each
grain, a rotation period of 0.38 +/- 0.08 day is estimated for the
comet's nucleus.
     Naked-eye total-magnitude estimates by J. Gonzalez, Asturias,
Spain: Jan. 9.81 UT, 3.4; 17.07, 3.7; 22.80, 4.1; 31.95, 4.3; Feb.
7.81, 4.8.

                      (C) Copyright 2005 CBAT
2005 February 9                (8480)            Daniel W. E. Green

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