Stars: Color Index
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Stars: Color Index |
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| During the observing session, take images of the star field (in this case NGC 1857), using both the B filter and the V filter. Correct exposure time must be determined, one that yields a good signal to noise ratio and will not result in any of the stars being saturated. The same exposure time must be used for the images taken with both filters. |
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| Above are two images of NGC 1857, one taken with blue filter (left) and one with visual filter (right). | |
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| Page updated 10/29/01 | Copyright ©2001 C. Gino |
cgino@astrophys-assist.com |