NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2015 Jun 30, 07:29 -0700
Andres,
For the camera image the distance was determined by counting the pixels from the center of each planet illuminated disc then multiplying by the calibrated minutes of arc per pixel for the 200mm fixed prime lens used (.0975' x 381 pixels = 37.147'). The sextant distance was measured carefully on the arc and off the arc giving me both index error and planet to planet distance ( 60' - 23.2' = 36.8' off arc distance and 37.3' on arc distance. 36.8 + 37.3 = 74.1' 74.1' /2 = 37.05' distance ). Index error is 0.2' on arc.
The DSLR camera is used as a sextant and then compared to a sextant (C&P with x4 optic) observation. The posted image is the actual DSLR image used for counting pixels. The sextant observations on and off arc were made immediately following the camera observation and not timed to the UT second. PDT time was marked by the DSLR camera clock.
Greg Rudzinski
From: Andrés Ruiz
Date: 2015 Jun 30, 11:57 +0200Greg, what do you mean with "and sextant"?using the camera as a sextant?, or with a camera and a sextant?
