MSL - Astronomical Observations, Phobos/Deimos, planetary/celestial observations and more |
MSL - Astronomical Observations, Phobos/Deimos, planetary/celestial observations and more |
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 4252 Joined: 17-January 05 Member No.: 152 ![]() |
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#2
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 4252 Joined: 17-January 05 Member No.: 152 ![]() |
Regulus looks good. To bring out the fainter stars, I subtracted two ML frames, took the absolute value, and then did a linear contrast stretch. That supresses noise ("fake stars") and any real stars are visible as pairs of points, with the same separation distance and orientation for all real stars. I then generated a chart of the Regulus region at the same scale as ML (15 degrees per 1200 pix). The scale was set by hand so isn't exact. I then adjusted the one free parameter (overall orientation) until I found a match.
Here's an animation flipping between the chart and the ML difference image. There are two or three stars visible apart from Regulus (circled in the ML frame). The scale's out a bit but the fit is otherwise very good, considering there is only one free parameter here: The stars apart from Regulus are Leo eta-30, Subra, and possibly Leo 31. And here's a similar difference of two MR frames. You can see a few real stars (paired streaks, same orientation and separation). These stars are too faint to show up on my chart... Crazy that Regulus is very close to the Sun now as seen from Earth, so we'd normally never see it this time of year. |
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