Earthshine blog

Earthshine blog

"Earthshine blog"

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

New blog!

To-do listPosted by Peter Thejll May 20, 2013 12:39PM
We are starting a new blog over at

where issues related to how to design (and one day, hopefully, build) a better eshine telescope are considered.

The present blog will from now on only discuss how to use the data obtained from the Hawaii telescope.

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To-do listPosted by Peter Thejll Apr 18, 2012 10:31AM
A wish-list for this system should include

'proper polar axis alignment' and/or
'automatic centering of telescope on flattest part of hohlraum field'

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Moon halo

To-do listPosted by Peter Thejll Jan 15, 2012 02:32PM
In order to better understand the empirical description of the Moon halo we need more deep images of the Moon itself. We have studies of point sources that show the halo but need a connected set of images from one night that allows tracing of the Moon halo out far, and then a set of images of the sky that show the halo but without the Moon in the image. We almost did this for one night but could improve the data in the following way: Image where Moon is in the frame should be deeper which probably means overexposing the CCD or we should get MANY shorter exposures and then stack them. We also need longer exposures from the non-Moon part of the scan to go as far out as possible.

SWARP may be useful for generating one connected picture of the Moon Halo, suitable for study and display in papers.

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To-do listPosted by Peter Thejll Jan 15, 2012 02:28PM
We know, from observations of the M7 cluster, that the stellar images are not round across the field. This may because some of the optical components are not at right angles to the optical axos. I think that the color filters are angled slightly. We would like to map the ellipticity better and need more images - they should be rich in stars from side to side. Deep images of the Milky Way may be what we need.

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