On the Digitisation of Odessa collection of astronomical negatives. Examination of the Epson Perfection V700 photo scanner
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Дата
2017
Науковий керівник
Укладач
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Назва журналу
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Назва тому
Видавець
Одеський національний університет імені І. І. Мечникова
Анотація
This study was aimed to estimate the
precision of the selected plate processing method and
test the accuracy of the Epson Perfection V700 Photo
scanner used to digitize astroplates from the Odessa
Astronomical Observatory’s collection. The processing
of astroplates was performed using specific software
developed in the LINUX/MIDAS/ROMAFOT environment.
In order to estimate the repeatability of the
scanner’s astrometric and photometric errors, six consecutive
scans of one and the same plate (No 17,000 —
the Pleiades star cluster) were processed in two scanning
modes with spatial resolutions of 1,200 and 2,400 dpi.
The plate was exposed for 30 minutes with the fourth
tube of the Seven Wide Angle (SWA) astrograph. The
scan size was 18 x 24 cm (13 x 18 degrees). The following
estimates of the scanner’s accuracy were obtained for the
stars brighter than B < 13 m in the two scanning modes:
1) σxy = ± 0.023 px, σm = ± 0.013m; 2) σxy = ± 0.082 px,
σm = ± 0.042m for the Cartesian coordinates and instrumental
magnitude, respectively.
Опис
Ключові слова
astronegative, scanning, processing of digitized plates
Бібліографічний опис
Odessa Astronomical publications = Одесские астрономические публикации = Одеські астрономічні публікації