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CCD Images

All images unless noted are taken at the Newtonian focus of a 10-inch (25cm) f/6 reflector with a cookbook CCD camera with a TC-245 chip, cooled to a unknown temperature by applying 5 Volts to a Peltier cooler.  All are dark subtracted.  Flat-fielding has not been done unless noted in these preliminary images.  Expect future images to be flat-fielded.

Supernova 1998aq in Ursa Major

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.




1998aq 05/04/98

6.5 minute exposure (13x30s).

M66 - Barred Spiral in Leo

M66 - 5 separate 30 second images aligned. Flat-fielded. 02/01/98

Crescent moon

02/01/98. Both of these moon shots were taken via eyepiece projection through a 9.7mm Plossl and a green filter.

Crab Nebula - M1

M1. A single 30 second exposure. Cooled with 5V on the peltier device.

Orion Nebula in good seeing

A single 30 second exposure taken in good seeing. Compare this with the shot below. 02/01/98




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.

More outer reaches of M42


Flame Nebula

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. 

Beta Cygni -- 8seconds

8 second exposure. Gaussian equalized, dark subtracted. Additional exponential scaling. Compare this to the 2 second exposure D. Armstrong.








Limiting magnitude

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.

Rotating meteor

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. 

M51 from Yerkes

This image was taken by Ezra Boyd through a 1 meter reflector at Yerkes Observatory. 

All images on this page copyright by their respective photographers.

Return to: RAS home page 

Dean W. Armstrong <dean+ras@uchicago.edu>