Central Bureau for Astronomical Telegrams
IAUC 9089: V5584 Sgr = N Sgr 2009 No. 4
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Circular No. 9089
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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V5584 SAGITTARII = NOVA SAGITTARII 2009 No. 4
Koichi Nishiyama, Kurume, Fukuoka-ken, Japan; and F. Kabashima,
Miyaki-cho, Saga-ken, Japan, report their discovery of an apparent
nova (mag 9.3) on two 60-s unfiltered CCD frames (limiting mag 13.6)
taken on Oct. 26.439 and 26.440 UT using a 105-mm f/4 camera lens;
their five unfiltered CCD frames (limiting mag 17.5) taken around
Oct. 26.455 using a 0.40-m reflector yield mag 9.3 and the
following position for the new star: R.A. = 18h31m32s.79, Decl. =
-16o19'07".5 (equinox 2000.0). Nothing is visible at this position
on their recent survey frames taken on Oct. 20.449 (limiting mag
13.9) and 21.451 (limiting mag 13.4). Following posting on the
Central Bureau's unconfirmed-objects webpage, other observers have
reported CCD magnitudes and astrometry: Oct. 26.764, mag 9.3,
position end figures 32s.79, 07".8 (P. Corelli, Pagnacco, Italy,
0.45-m reflector); Oct. 27.09, about 9.0, 32s.81, 07".5 (E. Guido
and G. Sostero, remotely with a 0.25-m reflector at the GRAS
Observatory near Mayhill, NM, U.S.A.). Corelli adds that nothing
is visible at the nova's position on a Palomar plate (limiting mag
21.0). Additional details appear on CBETs 1994 and 1995.
K. Kinugasa, S. Honda, O. Hashimoto, H. Taguchi and H.
Takahashi, Gunma Astronomical Observatory (GAO), write that a low-
resolution spectrum (range 420-800 nm; resolution 1.0 nm), obtained
with the GAO 1.5-m telescope (+ GLOWS) on Oct. 27.4 UT, confirms
that this variable star is a nova, showing H_alpha emission (FWHM
about 600 km/s) with a P-Cyg profile, its absorption minimum being
blue-shifted by 900 km/s with respect to the emission peak. Fe II
(multiplet 42) lines also have P-Cyg profiles.
H. Maehara, Kwasan Observatory, Kyoto University, writes that
a low-resolution optical spectrum (range 400-800 nm, resolution
about 200) of this nova was obtained on Oct. 27.42 UT with the
25-cm telescope of the Kwasan Observatory. The spectrum shows an
H-alpha emission line that suggests that this object is a classical
nova. CCD images of the nova yield the following magnitudes: Oct.
27.460, I_c = 8.66; 27.461, R_c = 9.29; 27.461, V = 9.90; 27.463,
B = 11.06. Maehara also forwards the report of a spectrogram
obtained by M. Fujii (Okayama, Japan; 40-cm telescope, range 400-
950 nm) on Oct. 27.43, showing H_alpha, H_beta, and Fe II lines
with P-Cyg features; the absorption component of the H_alpha line
is blue-shifted from the emission peak by 1.5 nm. These features
suggest that this object is a classical nova around maximum. Fujii
adds that the Na D line has a equivalent width of 0.7 nm.
N. Samus and E. V. Kazarovets report that the GCVS team has
assigned the designation V5584 Sgr to this nova.
(C) Copyright 2009 CBAT
2009 October 28 (9089) Daniel W. E. Green
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