Earthshine blog

Earthshine blog

"Earthshine blog"

A blog about a system to determine terrestrial albedo by earthshine observations. Feasible thanks to sheer determination.

JD2456006

Observing logPosted by Peter Thejll Mar 19, 2012 05:12PM

Extraordinary night - followed the Moon from moonrise until dawn. Clearest night we have had yet. Halo almost non-existent on DS.

This shows that we may be able to get very good data very close to the Sun - but in that case extreme refraction would have to be handled. Will look into whether this can be achieved from the JPL ephemeris. Exposure time also needs to compensate for the strong extinction through 5-10 airmasses. Not sure how to do that without stopping and starting scripts.

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Posted by Chris Flynn Mar 20, 2012 01:15AM

Brilliant! That's really great news -- we can measure the extinction from this night and compare to nights when the halo was broader. Also, it might be possible to track alpha in the halo as a function of airmass -- we haven't tried that yet!