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IAUC 8972: V1309 Sco = N Sco 2008

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                                                  Circular No. 8972
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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     S. Nakano, Sumoto, Japan, reports the discovery by K.
Nishiyama (Kurume, Fukuoka-ken) and F. Kabashima (Miyaki-cho, Saga-
ken) of a bright star (mag 9.5) on unfiltered CCD images obtained
on Sept. 2.4594 UT with a 0.40-m f/9.8 reflector, the presumed nova
being located at R.A. = 17h57m32s.93 +/- 0s.01, Decl. =
-30o43'10".1 +/- 0".1 (equinox 2000.0).  Nothing is visible at this
position on their unfiltered CCD frames taken on Aug. 20.476
(limiting mag 12.8) and 21.470 (limiting mag 12.1) using a patrol
camera (+ 105-mm-f.l. f/5.6 lens).  They note nearby USNO-B1.0-
catalogue stars at position end figures 33s.221, 10".56 (red mag
12.7) and 33s.015, 10".39 (red mag 14.8).  Additional independent
discoveries also were reported from survey images obtained with
digital cameras and telephoto lenses by Y. Sakurai (Mito, Ibaraki-
ken, Japan; via Nakano; nova at mag 9.7 on Sept. 3.4) and by Guoyou
Sun (Qufu, Shandong, China) and Xing Gao (Urumqi, Xinjiang, China)
in the course of the Xingming Observatory Nova Survey (mag
approximately 10.5 on Sept. 2.6).  Following posting on the CBAT
unconfirmed-objects webpage, several other observers sent
observations of V1309 Sco that were included with additional
discovery details on CBET 1496.  Additional selected magnitudes
(mostly from unfiltered CCD images) for the nova:  1958 Apr. 18,
[19.0 (red Palomar Sky Survey, via C. Jacques and E. Pimentel, Belo
Horizonte, Brazil); 2008 July 30, [12 (Sakurai); Aug. 14, 20, 21,
and 30, [13.5: (Sun and Gao); 30.783, [14.5 (D. Chekhovich, S.
Korotkiy, and T. Kryachko, Karachay-Cherkessia, Russia); 31, [13.5:
(Sun and Gao); Sept. 2.735, 10.5 (Chekhovich et al.); 3.512, 9.0
(Nishiyama and Kabashima); 4.489, 8.3 (Nishiyama and Kabashima);
5.483, 7.1 (Nishiyama and Kabashima).  N. N. Samus, Institute of
Astronomy, Moscow, informs us that this nova has been assigned the
designation V1309 Sco.
     H. Naito, Nishi-Harima Astronomical Observatory, reports that
low-resolution spectra of V1309 Sco were taken on Sept. 3.49 and
4.47 UT by M. Fujii (Ibara, Okayama, Japan, 0.28-m reflector; range
400-800 nm, resolution R about 500) and on Sept. 5.47 by Naito with
the 2.0-m NAYUTA telescope (+ MALLS; range 410-670 nm, R about 1200).
The spectra show a smooth continuum with some absorption lines and
strong Balmer emission lines, which indicate that this object is
indeed a classical nova.  The expansion velocities derived from the
FWHM of H_alpha are somewhat slow (670 km/s on Sept. 3.49, 670 km/s
on Sept. 4.47, and 470 km/s on Sept. 5.47).  The spectrum also
shows an interstellar Na D absorption line (EW = 0.6 nm).  The
ratios of H_alpha to H_beta are 10 on Sept. 4.47 and 6.7 on Sept.

                      (C) Copyright 2008 CBAT
2008 September 6               (8972)            Daniel W. E. Green

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