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This document provides some guidelines and tips for C-14 observations
using a standard Mark I eyeball as the detector.
LOCAL CONDITIONS AND TARGET SELECTION
2. Even well after sundown, the sky brightness is quite high, due to
light pollution from nearby streetlights and security lights, and the surrounding
megopolis. Point sources dimmer
than 10th magnitude are probably invisible, and extended objects will have an even lower
(brighter) magnitude limit.
3. Near the horizon to the south, the heating plant is pumping hot air into
the sky, so the seeing is really bad. A security lamp to the north will shine
directly on the scope aperture for azimuth = +/- 30 deg, but this can be screened
by wedging the large
styrofoam sheet in the lower part of the dome slit. The best direction to see
dim objects is, of course, at the zenith, but east and west azimuths are not
too bad. Plan your target selection accordingly.
4. If you're looking for ideas for things to observe, Burnham's
Celestial Atlas, which should be on the desk or the bookshelf, lists many
multiple stars, nebulae, and other astronomical showpieces, and Sky & Telescope Magazine
is also a good resource for targets. In addition, RDRO will gradually compile a list of
good targets
SETUP
2. Wait for night to fall fully before trying for any dim objects. Also, give
your eyes at least 15 minutes to fully dark-adjust after you turn off all white lights in the dome.
EYEPIECE SELECTION
3. There is a "Nebular Filter" in the eyepiece box, which is intended to enhance the green wavelengths
emitted by planetary nebulae and some planets. Remove the eyepiece and screw the
filter into the base of the eyepiece. Reinsert the eyepiece.
POINTING
2. If you can locate your target object with the naked eye, align the scope
the the object by sighting along the rails on the main tube.
3. If you have RA and dec coordinates for the object (and if you calibrated
the setting circles as described in the Setup document), then you can
simply move the scope to those coordinates. Beware of confusing north (+) and
south (-) declinations.
4. The target should now be in the finderscope. Move it to the crosshair center
with gentle tugs on the yoke and main scope tube. The pushbutton paddle controls can be
used for the fine alignment.
5. The target should now be visible in the main scope eyepiece. Center
it with the paddle controls, and make any fine focus adjustments necessary.
6. Marvel at the splendors of the universe.
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