NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2013 May 27, 08:32 -0700
Gary,
Try this USNO calculator for RA and declination. Mercury is included in the available bodies.
https://aa.usno.navy.mil/data/docs/geocentric.php
During twilight last evening a DSLR image was taken using a 50 mm fixed prime lens at infinite focus, 1/60 sec., ISO 1600, F 2. The original image doesn't show much . The enhanced image shows all three planets and a defined horizon. Pixels were counted for each body to get an Ho then reduced by USNO. Venus 0.3' T, Jupiter 0.9' T, Mercury 0.5' T. Mercury RA and declination was obtained by USNO then the RA converted to sidereal hour angle to add to GHA Aries. General sight reduction was then done. Venus and Jupiter were reduced by USNO directly.
Attached is the original image and enhanced image.
Greg Rudzinski
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