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IAUC 8671: N Oph 2006; RS Oph

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                                                  Circular No. 8671
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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     G. Pojmanski, Warsaw University Astronomical Observatory,
reports the discovery on ASAS-3 200-mm-f.l.-lens telephoto images
(cf. IAUC 8617) of an apparent nova located at R.A. = 17h33m13s,
Decl. = -24o21'.1 (equinox 2000.0).  Available ASAS V magnitudes:
2005 Oct. 26.013 UT, [14; 2006 Feb. 9.390, 12.08; 10.327, 12.04;
10.329, 11.94; 10.342, 12.07; 11.334, 11.48; 12.329, 11.07; 13.336,
11.47.  The object is also clearly visible in the ASAS-3 I-band
images taken on Feb. 8.379.  H. Yamaoka, Kyushu University,
provides his average of measurements of the position of the new
nova from I_c-band CCD images taken by S. Kiyota on Feb. 12.83 and
by H. Maehara on Feb. 10.83:  R.A. = 17h33m13s.06, Decl. =
-24o21'07".1 (rms about 0".2; UCAC2 reference stars); the nearest
star in the USNO-B1.0 catalog is about 3" away from this position,
and a red Digitized Sky Survey image from 1991 Aug. 11 does not
show any object to limiting mag about 18 (affected by nearby stars).
Yamaoka adds that low-resolution spectra of this new object --
taken around Feb. 12.9 by K. Ayani with the Bisei Astronomical
Observatory (BAO) 1.01-m telescope, by H. Naito and S. Narusawa
(Nishi-Harima Astronomical Observatory) with the 2.0-m NAYUTA
telescope, and by M. Fujii (Ibara, Okayama, Japan) with a 0.28-m
telescope -- show prominent Balmer lines with P-Cyg profiles
superimposed on a very red continuum, which suggests that the
object is a classical nova near maximum.  Deep interstellar Na D
absorption is also seen.  From the BAO spectrum, the FWHM of
H_alpha emission is 560 km/s, and an absorption minimum of that is
blueshifted by 530 km/s from the emission peek.  O I 777.3-nm and
Fe II emissions are also detected with P-Cyg profiles.

     This recurrent nova is in outburst for the first time since
1985 (cf. IAUC 4030, 4031), as indicated by the following visual
magnitude estimates:  Feb. 12.829 UT, 4.5 (H. Narumi, Ehime,
Kita-gun, Japan; communicated by K. Hirosawa, Aichi, Inazawa-shi,
Japan); 12.847, 4.6 (K. Kanai, Gunma, Isezaki-shi, Japan; via
Hirosawa); 12.862, 4.4 (Kanai); 13.163, 4.8 (W. Renz, Karlsruhe,
Germany); 13.27, 4.9 (A. Pereira, Cabo da Roca, Portugal).  S.
Nakano (Sumoto, Japan) forwards unfiltered CCD magnitudes of RS Oph
from Y. Nakamura (Kameyama, Mie-ken, Japan; survey frames with a
105-mm f/2.8 lens):  Feb. 9.855, 10.5; 12.8426, 4.5.  ASAS V
magnitudes from Pojmanski:  2005 Oct. 26.998, 10.72; 2006 Feb.
13.341, 5.4 (saturated); 13.344, 5.3.

                      (C) Copyright 2006 CBAT
2006 February 13               (8671)            Daniel W. E. Green

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