This paper is about adding a further layer of correction to earthshine measurements and therefore albedo determination by terrestrial based observations.
Influence of celestial light on lunar surface brightness determinations: Application to earthshine studies
P. Thejll, H. Gleisner, C. Flynn
A&A 573 A131 (2015)
(open access with registration)
Aims. We consider the influence of celestial-sphere brightness on determinations of terrestrial albedo from earthshine intensity
measurements. In particular, the contributions from zodiacal light and starlight are considered.
Results. We find that celestial-sphere surface brightness can be so large that a considerable and unacceptable error level would have
an impact on half of typical earthshine-based albedo-determinations if left unaccounted for. Considering the empirical uncertainty on
ZL, we show that almost all our earthshine data can be used if a sky correction is made. In real observations we find up to a 1% effect
on albedo results of correcting for the celestial brightness.
From the body of the paper
Satellites cannot yet observe terrestrial albedo with long-term accuracy beyond the 1% limit (Kieffer & Stone 2005). Careful ground-based observations of earthshine intensity potentially offer a way to obtain albedo data more accurately and at a fraction of the cost of space-based systems (MacDonald et al. 1992; Flatte et al. 1992).
Part of the problem is telescopes seeing the sky around the moon which is an additional complication if it is not black. Optical telescope work involves a lot of compensation anyway, such as subtract of known sensor offset, uneven response across the field and so on.
IMO albedo determination is dubious anyway at least because of spectral effects so I guess in the medium term a combination of earthshine and satellite data is all there is on offer. Longer term I doubt we will worry about albedo other than as a niche academic matter.
Post by Tim