NavList:

   

Reply

Thanks, Greg, for the heads-up that Jupiter is close enough to the
Moon for small-field photography.  I thought I'd give it a shot during
the daytime, which I've never attempted before.  Success!  Attached
are an original camera image and a contrast-stretched crop of Jupiter,
which can be seen near (x,y)=(4155,1320).  It's visible even with no
contrast stretching once you zoom in with an image viewer.

I had to zoom out a little with the camera to get them both in the
frame (I previewed the geometry in Stellarium, since of course I could
see only the Moon during the actual shot), so I don't have calibration
for this zoom setting and can't do any astrometry.  But multiple
camera images taken over the course of a few minutes show Jupiter in
the same position relative to the Moon, so I'm sure I have the right
object (and the distance is nearly right based on a crude plate-scale
estimate from the Moon's diameter).  All photos are handheld at 1/250
second, ISO 100, f/6.3, with the Canon SX160 point-and-shoot.

Does anyone have one of the Canon DSLRs with infrared filter removed
(the ones optimized for astrophotography)?  What is the limiting
magnitude for daylight stars with a deep red filter (and/or polarizer
when the geometry is right)?  Tomorrow, Mars or Pollux might be a good
test for a fainter daylight-photographic-lunar (3 magnitudes fainter).
 Or there's Venus on September 8, which should be an absolute walk in
the park at mag -3.5.  Maybe even an iPhone can snag it.

Cheers,
Peter

File:

File:

   

Reply