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IAUC 8673: V5117 Sgr = N Sgr 2006; RS Oph

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IAUC number

                                                  Circular No. 8673
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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    W. Liller, Vina del Mar, Chile, reports his discovery of an
apparent nova (mag approximately 9.0) on three Technical Pan
photographs taken with an 85-mm-f.l. camera lens (+ orange filter)
around Feb. 17.37 UT.  The new object is located at R.A. =
17h58m.9, Decl. = -36o48' (equinox 2000.0).  Nothing brighter than
mag 11.0 was seen at this position on a photo taken on Feb. 5.36.
Liller adds that a low-dispersion CCD spectrogram of the H_alpha
region (resolution 0.32 nm/pixel) of the apparent nova, taken on
Feb. 19.38 UT with a 0.2-m Schmidt telescope (+ 75 lines/mm
grating), shows a moderately strong H_alpha emission with a FWHM of
630 +/- 25 km/s.  A weak P-Cyg profile may be present approximately
535 km/s from the peak of the H_alpha emission.  H. Yamaoka, Kyushu
University, reports the independent discovery of this nova at mag
about 8.6 on Feb. 17.84 by Minoru Yamamoto (Okazaki, Aichi, Japan)
via two digital-camera images taken with a 85-mm-f.l. camera lens
and a Fuji Finepix S2Pro camera; Yamamoto's position for the new
object is R.A. = 17h58m54s, Decl. = -36o47'40".  C. Jacques and E.
Pimentel, Belo Horizonte, Brazil, write that their unfiltered CCD
images taken on Feb. 19.34 UT show the new object at mag 8.6 with
the following position end figures:  52s.61, 35".1 (equinox 2000.0).
Jacques adds that a USNO-B1.0 catalogued source that is also
visible on a red 1979 Digitized Sky Survey plate (with limiting mag
19.9) has red mag 17.4 and position end figures 52s.60, 36".2.
Visual magnitude estimate by A. Pearce, Nedlands, W. Australia:
Feb. 19.848 UT, 9.2.  N. N. Samus, Institute of Astronomy, Russian
Academy of Sciences, informs us that the designation V5117 Sgr has
been given to this nova.

     R. K. Das, N. M. Ashok, and D. P. K. Banerjee, Physical
Research Laboratory, report that near-infrared JHK spectroscopy of
RS Oph during its current outburst (cf. IAUC 8671), obtained with
the Mt. Abu 1.2-m telescope (+ PRL Near Infrared NICMOS3
Imager/Spectrometer) on Feb. 16.99 UT,  shows prominent H I
emission lines of Paschen_beta, Paschen_gamma, Brackett_gamma,
Brackett_10 through Brackett_19, He I at 1.0830 and 2.0581 microns,
and O I at 1.1288 microns.
     CCD magnitudes by G. Sostero and E. Guido, Udine, Italy (via a
remotely operated 0.25-m reflector near Mayhill, NM):  Feb. 13.490
UT, B = 5.90; 13.491, V = 5.00; 13.493, R_c = 4.40; 14.487, B =
6.25; 14.488, V = 5.47; 14.490, R_c = 4.40; 16.484, B = 6.99;
16.485, V = 6.23; 16.487, R_c = 5.04; 20.481, B = 8.03; 20.483, V =
7.23; 20.485, R_c = 5.05.

                      (C) Copyright 2006 CBAT
2006 February 20               (8673)            Daniel W. E. Green

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