QUOTE (fredk @ Apr 23 2014, 07:15 PM)
Should a sundog be at the same elevation as the sun? Your feature appears to be a fair bit higher than the sun - I think most of the horizon in this view is the distant, true western horizon.
Honestly, I was looking at the mosaic and thinking that the solar disc was not imaged, was behind the cut-outs on the upper left side of the mosaic. Looking more closely, it does indeed look like the solar disc is imaged (and completely saturates the pixels around it), rather farther down towards the horizon than I was thinking it should be.
Also, isn't Oppy on a slope? I thought perhaps that what looks like horizontal in the image really isn't because the horizon may not be horizontal where she's sitting. With an undulating horizon from a tilted rover, I wasn't very positive that a different distance above the horizon equated to a different elevation.
Again, though, thanks for the comments, guys. It looked like a sundog to me more because of the way the little arc sort of glowed in mid-arc, which does indeed resemble the sundog phenomenon. Dunno if that's an artifact of the mosaicing process or, as Doug suggested, an internal camera reflection, but it did fool me.
-the other Doug (with my shield, not yet upon it)
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but I do like knowing how far away the horizon is! Quite close seems to be the answer. It should be easy to confirm your identification by the change in bearing as we move south.
