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IAUC 8931: NR Tri AUSTRALIS = N Tri AUSTRALIS 2008; C/2007 W1

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                                                  Circular No. 8931
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://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     Nicholas J. Brown, Quinns Rocks, Western Australia, reports
his discovery of a possible nova (mag 9.2) on two T-Max 400 films
taken on Apr. 1.73 UT with a 135-mm f/2 camera lens, giving the
variable's position approximately as R.A. = 16h18m47s, Decl.  =
-60o27'57" (equinox 2000.0; uncertainty estimated as about 10");
Brown adds that no star is visible at this position on his film
from Mar. 16.76 (limiting mag 11.5), and nothing is visible to mag
about 14 in this position on the Digitized Sky Survey.  A
catalogued star of mag 13.5-14.0 is visible to the northwest of the
variable.  Brown's visual observation of the variable on Apr. 2.74
yields mag approximately 9.0; he also estimated visual mag 10.1 on
Apr. 4.695.  Following posting on the Central Bureau's unconfirmed-
objects webpage, A. Amorim, Florianopolis, Brazil, reports the
following visual magnitude estimates for the variable:  Apr. 3.158,
9.3; 4.097, 9.9.  W. Liller, Vina del Mar, Chile, reports that a
Technical Pan photo (limiting mag about 11.0) taken with an 85-mm
camera lens on Mar. 31.33 through an orange filter shows a faint
but definite image of the apparent nova at magnitude approximately
10.5; nothing brighter than mag about 11 appears on a photo taken
by Liller on Mar. 15.  E. Guido and G. Sostero write that their
remote imaging with a 0.31-m f/9 reflector of the Remote
Astronomical Society (RAS) located near Moorook, Australia, on Apr.
4.86 yields the following precise position for the presumed nova:
R.A. = 16h18m48s.21, Decl. = -60o27'48".9 (equinox 2000.0; UCAC-2
catalogue reference stars).  C. Jacques, Belo Horizonte, Brazil,
also remotely obtained a 10-s unfiltered CCD image on Apr. 4.875
with an RAS 25-cm f/6 reflector at the Moorook Observatory,
yielding mag 10.2 and position end figures 48s.20, 49".1.  Jacques
adds that comparison with a European Southern Observatory red image
taken on 1984 Apr. 6 shows nothing at this position (estimated
limiting magnitude 19.2), the nearest visible star having position
end figures 47s.99, 45".8.  N. N. Samus, Institute of Astronomy,
Russian Academy of Sciences, informs us that this nova is being
assigned the variable-star designation NR TrA.

     Visual total-magnitude and coma-diameter estimates:  Mar. 6.08
UT, 12.7, 2'.2 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector);
29.07, 10.3, 8' (M. Goiato, Aracatuba, Brazil, 0.22-m refl.); 31.53,
10.2, 3'.2 (K. Yoshimoto, Yamaguchi, Japan, 0.25-m reflector); Apr.
2.09, 9.5, 6' (Gonzalez, 25x100 binoculars); 3.98, 8.9, 10'
(Gonzalez, Asturias, Spain, 10x50 binoculars).

                      (C) Copyright 2008 CBAT
2008 April 4                   (8931)            Daniel W. E. Green

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