New Earth-based Absolute Photometry of the Moon

Yu. I. Velikodskya, N. V. Opanasenkoa, L. A. Akimova, V. V. Korokhina, Yu. G. Shkuratova, V. G. Kaydasha, G. Videenb, Sh. A. Ehgamberdievc, N. E. Berdalievac

a Institute of Astronomy, Kharkiv National University, 35 Sumskaya St, Kharkiv, 61022, Ukraine
b Space Science Institute, 4750 Walnut St. Suite 205, Boulder CO 80301, USA
c Ulugh Beg Astronomical Institute of the Uzbek Academy of Sciences, 33 Astronomicheskaya St., Tashkent, 100052, Uzbekistan

Icarus, Volume 214, Issue 1, July 2011, Pages 30-45

Abstract

A two-month series of quasi-simultaneous imaging photometric observations of the Moon and the Sun has been performed at Maidanak Observatory (Uzbekistan). New absolute values of lunar albedo have been obtained. Maps of lunar apparent albedo and equigonal albedo at phase angles 1.7-73 at wavelength 603 nm are presented. The standard deviation of our data from a best-fitted phase curve is 2%. The average ratio of the Clementine albedo to ours is 1.41. The ratio of ROLO albedo to ours is 0.86. We expect that our albedo is more adequate, because we use a direct calibration method. Moreover, our data are in excellent agreement with independent measurements of absolute albedo by Saiki et al. (Earth Planets Space, 2008, 60, 417) at a phase angle near 7. A phase ratio imaging near opposition (1.6/2.7) shows almost the same ratio for maria and highlands, though bright craters (e.g., Tycho, Copernicus, Aristarchus) clearly reveal smaller slopes of phase function. This is an unexpected result, as the craters are bright and one could anticipate a manifestation of the coherent backscattering effect resulting in the opposition spike increasing at so small phase angles.

Data

Results of this work are presented in the paper. Here are the digital appendix to the paper: maps of lunar apparent and equigonal albedo, ephemeris table corresponded to these maps. Day and night observations are denoted with single and double dates, respectively. Angles are in degrees, distances are in kilometres. Description of the projections is below.

Date Phase angle Observer coordinates Sun coordinates Apparent albedo (perspective projection) Equigonal albedo (perspective projection) Apparent albedo (orthographic projection)
Selenographic latitude Selenographic longitude Distance Selenographic latitude Selenographic longitude Single archive
(7-Zip)
Single archive
(7-Zip)
Single archive
(7-Zip)
13.09.200673.12−6.126.683727910.11−66.33 FITS FITS FITS
12.10.200667.28−6.417.10377651−0.68−60.12 FITS FITS FITS
12.09.200659.79−5.315.833672800.14−53.80 FITS FITS FITS
11.10.200654.31−6.296.52371649−0.65−47.63 FITS FITS FITS
11.09.200646.02−4.124.573624450.17−41.29 FITS FITS FITS
10.09.200631.91−2.582.943589380.21−28.85 FITS FITS FITS
09.10.200626.90−4.773.98361480−0.59−22.63 FITS FITS FITS
08/09.10.200626.48−4.773.98360365−0.58−22.20 FITS FITS FITS
08/09.10.200624.50−4.484.37356367−0.58−19.85 FITS FITS FITS
08/09.10.200622.25−3.814.72358623−0.57−17.31 FITS FITS FITS
08/09.09.200616.63−0.661.043550240.25−15.57 FITS FITS FITS
08/09.09.200615.07−0.161.313526650.25−13.75 FITS FITS FITS
07/08.10.200611.88−3.352.14356580−0.55−9.41 FITS FITS FITS
07/08.10.20069.89−2.892.49353216−0.54−7.12 FITS FITS FITS
07/08.10.20067.87−2.262.78355552−0.53−4.90 FITS FITS FITS
07/08.09.20062.411.20−1.023554350.29−3.25 FITS FITS FITS
07/08.09.20061.711.51−0.953534830.29−2.15 FITS FITS FITS
07/08.09.2006−2.162.25−0.473542120.300.45 FITS FITS FITS
07/08.09.2006−2.532.37−0.413554100.301.05 FITS FITS FITS
06/07.10.2006−3.00−1.670.12355930−0.512.89 FITS FITS FITS
06/07.10.2006−4.96−1.110.38352215−0.505.30 FITS FITS FITS
06/07.10.2006−6.97−0.430.71354908−0.507.68 FITS FITS FITS
06/07.09.2006−12.683.06−3.053573540.329.34 FITS FITS FITS
06/07.09.2006−14.723.71−2.773550730.3311.57 FITS FITS FITS
06/07.09.2006−16.074.07−2.443569620.3313.21 FITS FITS FITS
05/06.10.2006−18.000.32−1.95355464−0.4716.03 FITS FITS FITS
05/06.10.2006−20.061.01−1.57353482−0.4618.43 FITS FITS FITS
05/06.10.2006−20.691.23−1.42354289−0.4619.20 FITS FITS FITS
02.10.2006−63.636.12−5.82369452−0.3657.60 FITS FITS FITS

Projections

Perspective projection corresponds to original observational view of the Moon with libration parameters and distances Observer-Moon specified in the table above.

Orthographic projection corresponds to zero libration.

Radius of lunar disk is 535 pixels in perspective as well as in orthographic projection. Position angle is 0 (north up). The first line of FITS-image is at the bottom of image. If your viewer shows the first line at the top, you will see the Moon mirrored vertically.

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