Tuesday, March 22, 2016

jupiter's redder red spot, detail on ganymede

jupiter's up and in prime form right now
here's my first of the season:

might be my imagination, 
but the red spot (which had been fading to tan) 
looks more red to me this year

here's an interesting one i think i neglected to post from 2 years ago look closely at Ganymede transiting the face of Jupiter:

The black dot lower left is the shadow of Io which is further left and below Jupiter.
Just below the shadow, Ganymede is crossing the face of Jupiter.  A close look at Ganymede shows the bottom is white while the top is slightly brown, demonstrating detail on one of Jupiter's moons.  Although not much, I never thought i'd get that from a backyard telescope.

More to come, including an animation of last night's double transit.

details:
nexstar 8 GPS (8" SCT on a wedge)
ZWO ASI120MC
3 minute capture with firecapture @ 50 fps (exposure limited at 95% histogram with gain 64)
stacked in autostakkert, Drizzle 3x, then reduced to 1.5x
sharpened in registax 6
Southern California
3/17/16 fair seeing
Mid(UT)=065303.255

Ganymede transit image from 3/30/2014

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