Earthshine blog

Earthshine blog

"Earthshine blog"

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

Altair and Menkab - the psfs

Exploring the PSFPosted by Chris Flynn Oct 12, 2011 12:12PM
We now have good radial profiles of Altair and Menkab. Altair was observed in very good conditions, and its profile is close to the expectation of r^-3 for the diffraction limit -- in three of the 5 bands. In B and VE1 funny things are happening which we don't yet understand. The Menkab profiles have halos like r^-1.5 -- much broader. The plots below compare both stars:


Altair:
Menkab:

We think that Menkab might have been taken on a not-quite-perfect night photometrically. We're looking into this, so watch this space!




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