(CCD image by Denis Buczynski)
(CCD image by Gianluca Masi)
(Spectrum by Maurice Gavin)
We have been informed that Yuji Nakamura, Mie, Japan, has discovered a possible nova in Cygnus. The object was discovered from the photograph (200mm F/4, Tri-X) taken on July 13.651 UT when the object was mag 11.9. The existence of the object was confirmed at July 16.515 UT by H. Fukushima (NAOJ) giving V = 11.69.
K. Kadota (Ageo, Saitama, Japan) reports the following accurate astrometry on his CCD frames:
2001 07 17.735 UT R.A. = 20h07m17s.94 Decl. = +36o04'37".2 (equinox J2000.0) 12 reference stars from GSC-ACT. Mean residuals: 0.11" in R.A., 0.13" in Decl. 0.18-m f/5.5 reflector.At this exact position, there is no star on DSS images to their limiting magnitudes. There is no corresponding 2MASS star at this location.
Spectroscopic confirmation and follow-up photometric observations are urgently requested.
Dr. Iijima has reported the following spectroscpy of the possible nova in Cygnus. The object is indeed a classical nova! Congratulations, Nakamura-san!
Date: Wed, 18 Jul 2001 05:47:25 +0200 (MET DST) From: Takashi IijimaOptical spectra in the range from 430 to 680 nm of the possible nova in Cygnus reported by Y. Nakamura were taken at July 17.9 UT using a Boller and Chivens spectrograph mounted on the 122 cm telescope of Asiago Astrophysical Observatory of the University of Padova. The spectra show broad emission lines of H I, Fe II, and probably Na I D and N II. Some prominents emission lines are accompanied by P Cygni type absorption components. The FWHM of H-alpha emission component is about 950 km/s and a weak absorption component blue-shifted by about -1200 km/s is seen. This object could be a classical nova in the early decline stage from light maximum.
Subject: Nova Cyg 2001 July 18 2001, Asiago, Italy
T. Iijima Astronomical Observatory of Padova, Asiago Station, I-36012 Asiago (Vi) ITALY
Reinder Bouma/Edwin van Dijk chart (based on Henden/Sumner sequence)
Mike Simonsen chart (based on Henden/Sumner sequence)
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