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IAUC 8575: N Sco 2005; 2005dc; 2005da

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IAUC number

                                                  Circular No. 8575
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)

     M. L. Sitko and R. Kimes, University of Cincinnati; D. K.
Lynch, R. W. Russell, and D. L. Kim, The Aerospace Corporation; and
D. Griep, Infrared Telescope Facility (IRTF), report 3-14-micron
spectroscopy of this object on July 27.375 UT using the instrument
BASS on the IRTF.  The spectrum shows a smooth, featureless
continuum consistent with a Rayleigh-Jeans tail of a Planck
function.  The magnitude was approximately 4.8 in the bands L, M,
and N.
     Visual magnitude estimates:  July 26.735 UT, 8.9 (T. Cooper,
Bredell, Kempton Park, S. Africa); 26.881, 8.9 (J. G. de S. Aguiar,
Campinas, Brazil); 27.228, 9.0 (M. Linnolt, Woodside, CA).

SUPERNOVA 2005dc IN NGC 7107
     P. Luckas, Perth, W. Australia; O. Trondal, Oslo, Norway; and
M. Schwartz, Patagonia, AZ, report the discovery of an apparent
supernova (mag 15.7) on an unfiltered CCD frames taken with a
0.35-m Tenagra telescope at Perth on July 26.70 and 27.62 UT in the
course of the Tenagra Observatory Supernova Search.  SN 2005dc is
located at R.A. = 21h42m22s.66, Decl. = -44o47'21".2 (equinox
2000.0), which is 41" west and 9".6 north of NGC 7107 (the galaxy
center having position end figures 26s.50, 30".8).  Nothing was
visible at the position of 2005dc on an image taken by Luckas on
July 5.61 (limiting magnitude about 18.5).

SUPERNOVA 2005da IN UGC 11301
     M. Modjaz, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics; and T. Matheson, National Optical
Astronomy Observatory, report that a spectrogram (range 350-740 nm)
of SN 2005da (cf. IAUC 8570), obtained by P. Berlind on July 26.26
UT with the F. L. Whipple Observatory 1.5-m telescope (+ FAST),
reveals it to be a supernova, possibly a peculiar type-Ic supernova.
No obvious lines of hydrogen or helium are detected.  The spectrum
consists of wide absorption features, similarly to peculiar type-Ic
supernovae 1998bw and 2002ap (Foley et al. 2003, PASP 115, 1220).
In contrast to the spectra of supernovae 1998bw and 2002ap, this
new object's spectrum also exhibits a wide absorption trough at 585
nm, having removed the NED recession velocity of 4495 km/s for the
host galaxy (from Falco et al. 1999, PASP 111, 438), which could be
identified with Na I.  There are peaks near 530 and 640 nm and
absorptions near 470, 630, and 680 nm.

                      (C) Copyright 2005 CBAT
2005 July 27                   (8575)            Daniel W. E. Green

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