Central Bureau for Astronomical Telegrams
IAUC 8166: V2573 Oph = N Oph 2003
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Circular No. 8166
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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Phone 617-495-7440/7244/7444 (for emergency use only)
V2573 OPHIUCHI = NOVA OPHIUCHI 2003
On July 17, Akira Takao, Kitakyushu, Japan, reported the
discovery of a possible nova on unfiltered CCD images taken with a
120-mm f/4 telephoto lens, providing a position of R.A. =
17h19m14s.4, Decl. = -27o22'37" (equinox 2000.0; uncertainty +/-
20"), and the following approximate magnitudes: 2001 Apr. 18.806
UT, [12.6; 2002 Mar. 18.808, [11.6; May 12.647, [11.6; 2003 Apr.
18.812, [11.6; July 10.598, 11.4; 16.523, 11.2. L. A. G. Monard,
Pretoria, S. Africa, reported that the object appeared at mag 10.4
on an unfiltered CCD image taken on July 17.821, providing the
following precise position end figures: 14s.10, 35".4 (uncertainty
+/- 0".2); Monard adds that nothing is visible at this position on
a red Digitized Sky Survey image. V. Tabur, Wanniassa, Australian
Capital Territory, reports an independent discovery of this
variable star on unfiltered CCD images obtained with a 140-mm f/2.8
telephoto lens, explaining that he initially dismissed the object
as a less-urgent variable star due to its long presence on his past
images, as shown by the following magnitude estimates: 2003 Mar.
21.600, 12.9; Apr. 5.652, 13.1; 29.579, 13.2; May 4.566, 13.1;
10.538, 13.1; 22.667, 13.0; 29.595, 12.6; June 16.534, 10.1; July
5.574, 9.8. (Tabur provides position end figures 14s.2, 34",
uncertainty +/- 5"). T. Kato, Kyoto University, reports that
ASAS-3 images show the new object in outburst on June 15, with a
peak of V = 10.6 reached on June 26.
M. Della Valle, Arcetri Astrophysical Observatory, Florence;
and E. Mason, L. Pasquini, and J. Prichard, European Southern
Observatory, write: "Preliminary analysis of a spectrum (range
380-900 nm, resolution 48000), obtained on July 18.2 UT at La Silla
with the 2.2-m telescope (+ Fiber-fed Extended Range Optical
Spectrograph), shows the new object to be a nova caught during its
early decline. The spectrum is dominated by H_alpha, O I (mult. 1,
4; measured at 778.0 and 844.0 nm), and Ca II (mult. 2; measured at
850, 855, and 866 nm). H_alpha, H_beta, and Na I lines are flanked
by multiple P-Cyg profiles whose minimum absorptions give maximum
expansion velocities of about 1700, 1900, and 1500 km/s,
respectively. Also prominent are emission lines due to Fe II (mult.
42, 48, 49, 74). In particular, we note that the 493-nm line (mult.
42) is as strong as H_beta. [O I] at 630 and 636.4 nm and He I at
667.8 nm are also detected. The equivalent widths of the Na D
interstellar lines (0.085 and 0.07 nm) and Ca II H and K (0.04 and
0.06 nm) may suggest that this nova suffers from moderate
absorption."
N. N. Samus, Institute of Astronomy, Moscow, informs us that
the designation V2573 Oph has been given to this object.
(C) Copyright 2003 CBAT
2003 July 27 (8166) Daniel W. E. Green
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