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This is a wide field image with 35-mm lens. The field of view is so large as 22 deg and it contains about 10 thousands of stars until about 12 mag. The current PIXY system detects only 3000 or 4000 stars until 9.5 mag in order to avoid out of memory. The distortion field correction causes high accuracy of astrometry.
This is a narrow field image with a large telescope. The field of view is only 13 arcmin. The PIXY system has large capacity on field of view size. This example image contains about 300 stars until fainter than 20 mag but the system can examine it using USNO-A1.0 catalog.
Photo: Akimasa Nakamura
Magnified image in the Milky Way with 300-mm lens. The field of view is 2.6 deg. Fading around the circumferences is evident, so the PIXY system subtracts the background before examination.
The PIXY system also can examine such an image as of a globular cluster. Because the stars in the cluster is not recorded in GSC and USNO-A1.0 catalogs, the sytem matches the image and catalog using surrounding stars around the cluster. So it cannot examine an image of only a cluster. In this example, the PIXY system outputs stars in the cluster as candidates of new objects.
The PIXY system also can examine such an image as of a widely spreading galaxy. However, the magnitude of stars on the galaxy or the galaxy itself are not accuracy. There is a same problem in the GSC and USNO-A1.0 catalogs, the recoreded magnitude of galaxies are not proper or the data is not recoreded sometimes. Therefore, the PIXY system output many galaxies as candidates of variable stars or new objects. By the way, the nebula is sometimes deblended into so many particles and so many stars are detected after all when the details are clearly expressed. Then the system will fail in matching.
The PIXY system can also examine such images as what clouds are coveing over or what contains house, landscapes, etc. However, the magnitude estimated by the system becomes inaccurate especially of stars overlapping the clouds. Sometimes the house or landscapes are detected as so many stars and the system outputs them as many candidates of new objects. Sometimes faint stars cannot be detected properly.
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