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In order to produce the color image
seen here, I worked with data coming from 2
different plates taken at Palomar Observatory between 1990 and 1993.
The original file is 5,574x6,199 pixels with a resolution of about 1 arcsec per pixel. The image show an area of sky large
1.5° x 1.7°. This image is a composite from black
and white images taken with the Palomar Observatory's 48-inch
(1.2-meter) Samuel Oschin Telescope as a part of the second National
Geographic Palomar Observatory Sky Survey (POSS II). The images were
recorded on two type of glass photographic plates - one sensitive to red light
and the other to blue light and later they were digitized. |
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