a 4-minute (8x30s)exposure. The two stars above and to the left of the galaxy are mag 12.1 and 13.0. The supernovae is immediately to the lower left of the nucleus. This image was taken a week before expected maximum light. The supernovae is a Type Ia, approx. 60 Million light-years away. 980418.3 Image at right is based from VSNET's USNO A1.0 chart.
6.5 minute exposure (13x30s).
4 30-second images stacked. Dark frame subtracted and statistically
equalized. Cooled using 1.5 Volts, but no coolant running. Outside temp
was 40 degrees F. D. Armstrong. This and the flame nebula image were done
in very bad seeing.
5 30-second images stacked. Dark frame subtracted and gaussian equalization. Cooled using 1.5 Volts, but no coolant running. Outside temp was 40 degrees F. D. Armstrong.
10 millisecond exposure. High pass filter and statistically equalized. D. Armstrong.
8 second exposure. Gaussian equalized, dark subtracted. Additional exponential scaling. Compare this to the 2 second exposure D. Armstrong.
Selected Area 68:This image is a 30 second exposure, dark frame subtracted. Uncooled. The outside temp was 20 F. Compare this frame to "Finding your Telescope's Magnitude Limit", by Edgar Everhart, Sky & Telescope, Jan, 1984, pg.28-30. The star in the center is SAO 91810, mag. 8.2. The faintest stars are two at magnitude 16.1 . The next brightest on the frame should be a 16.8.
This meteor was caught both in the CCD and through a six-inch refractor visually. It gradually increased in brightness until sharply dimming about a half a degree away. I didn't notice the wobbling until after getting the CCD image.
This image was taken by Ezra Boyd through a 1 meter reflector at Yerkes Observatory.
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