H. Yamaoka, Kyushu University, reports the discovery by K. Itagaki (Yamagata, Japan) of a variable star on his CCD survey image taken on Sept. 22.5 UT with a 0.21-m reflector; a confirming unfiltered CCD image taken on Sept. 22.586 with a 0.60-m reflector yields mag about 14.0 and the following precise position: R.A. = 19h06m28s.58, Decl. = +7o06'44".3 (equinox 2000.0). Additional magnitudes from Itagaki (via S. Nakano): 2007 Nov. 2.396, [17.0; Sept. 22.586, 14.0; 24.489, 14.1; 27.445, 15.8; 29.529, 16.5; Oct. 1.38759, 16.7; 2.421, 16.9; 3.433, 17.1. The 2MASS catalogue contains a very faint star with position end figures 28s.60, 44".5. Following posting on the Central Bureau's unconfirmed-objects webpage, V. Nevski (Vitebsk, Belarus, 0.30-m reflector) reports that an unfiltered CCD image obtained on Sept. 22.8 yields red mag 14.0 and position end figures 28s.59, 44".6 for the variable, adding that nothing is visible at this position on Digitized Sky Survey images from 1951 July 5 and 1987 July 30 (limiting mag approximately 20). E. Y. Hsiao, M. L. Graham, C. J. Pritchet, and D. D. Balam, University of Victoria, report that a spectrogram (range 390-703 nm, resolution 0.3 nm), obtained on Sept. 23.16 using the 1.82-m Plaskett Telescope, exhibits a strongly increasing continuum from 600 to 703 nm with a broad and flat-topped emission (HWZI about 2700 km/s, 6.5 nm) at the position of H_alpha; additional details are given on CBET 1512. E. Kazarovets reports that the GCVS team assigns the designation V1721 Aql to this object.
International Astronomical Union Circular
- Pub Date:
- October 2008