MSL - Astronomical Observations, Phobos/Deimos, planetary/celestial observations and more |
MSL - Astronomical Observations, Phobos/Deimos, planetary/celestial observations and more |
Jun 29 2013, 05:25 PM
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#31
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
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Aug 7 2013, 11:23 PM
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#32
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
Here's a much improved attempt at extracting stars from the sol 351 ML frames. This time I took the two (positive-valued) differences of the two frames, carefully registered them (which entailed correcting for a bit of frame rotation between the two frames), averaged them, and then applied a filter with a kernel tailored to the star streaks (19 pix wide, 1 pix high). These steps were interspersed with various contrast stretches along the way.
The result now starts to look like an image of the night sky, with many stars visible. But the faintest stars I can see are only around magnitude 5.5 or 6, so they would be quite easy naked eye from a dark site. We know that mastcam was not designed to image the night sky! It's also interesting to note that the direction of star trailing is not very different from what it would be near Regulus as seen from Earth, even though the celestial poles of Mars and Earth are quite far apart. This is because the two poles are roughly in a straight line (geodesic) with Regulus. |
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