[IAUC] IAUC 9233: V1313 Sco = N Sco 2011 No. 2 [25139-2012/04-R1]

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                                                  Circular No. 9233
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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V1313 SCORPII = NOVA SCORPII 2011 No. 2
     As first announced on CBET 2813, two independent discoveries
of an apparent nova in Scorpius have been received by the Central
Bureau.  John Seach (Chatsworth Island, NSW, Australia) reported
finding a star of mag 9.8 on four CCD images taken on Sept. 6.37 UT
with a digital SLR camera (+ 50-mm f/1.2 lens; limiting mag 10.5),
with the position given as R.A. = 16h36m43s, Decl. = -41o32'46"
(equinox 2000.0), adding that nothing was visible at this position
on an image from Sept. 5.36 (limiting mag 10.5).  H. Yamaoka,
Kyushu University, forwards a report that Yuji Nakamura (Kameyama,
Mie, Japan) discovered this possible nova at mag about 9.7 on five
unfiltered CCD images taken with a 150-mm-f.l. telephoto lens on
Sept. 6.431; Nakamura's position end figures were 44s.4, 34"
(uncertainty about 30"), adding that nothing is visible at this
position on his image taken on Aug. 29.451 (limiting mag about
12.0).  When Yamaoka posted Nakamura's discovery observation on the
Central Bureau's TOCP, it was assigned the designation PNV
J16364440-4132340; the posting of Seach's discovery observation
yielded a second designation, PNV J16364300-4132460.  N. Samus
writes that the permanent GCVS designation V1313 Sco has been given
based on the spectroscopic confirmation of this object as a nova
(see below).
     E. Guido, N. Howes, and G. Sostero obtained images remotely
through the 2.0-m "Faulkes Telescope South" (+ Bessel R filter) on
Sept. 7.50, yielding mag 9.1 and position end figures 44s.29, 37".7;
they add that a USNO-B1.0-catalogue star with red mag 15.08 appears
very close to the position (within 0".06) of the variable.  P.
Camilleri (New Castle, NSW, Australia) and S. Williams (Sydney, NSW)
note that a star of mag 14-15 is visible on 1.2-m U.K. Schmidt
Telescope plates, providing position end figures 44s.29, 37".6 from
Digitized Sky Survey images (mag 14.3 measured from an infrared IVN
plate + RG715 filter taken on 1980 May 5.63; mag 15.2 measured from
a red IIIa-F plate + OG590 filter on 1997 Apr. 30.64).
     A. Arai, T. Kajikawa, C. Naka, Kyoto Sangyo University, write
that their low-resolution spectroscopy on Sept. 7.42 UT using the
Araki telescope at Koyama Astronomical Observatory suggest that the
object is an "Fe II"-type classical nova, highly reddened by the
interstellar medium.  F. Walter, Stony Brook University; and J.
Seron, Cerro Tololo Interamerican Observatory (CTIO), confirm that
V1313 Sco is a young galactic nova from a spectrum obtained on Sept.
8.091 with the SMARTS/CTIO 1.5-m reflector (range 565-695 nm), with
broad H_alpha emission having a triple-peaked spectrum that is
reminiscent of early recurrent-novae spectra.  Further
observational details are given on CBET 2813.

                      (C) Copyright 2011 CBAT
2011 September 13              (9233)            Daniel W. E. Green