Astronomical supplement to the 1:5 000 000 albedo map of the moon and the establishment of a 1:2 500 000 auxiliary mosaic

Abstract

view Abstract Citations (2) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Astronomical supplement to the 1:5000000 albedo map of the moon and the establishment of a 1:2500000 auxiliary mosaic. Wildey, R. L. Abstract A photoelectrically calibrated isodensity mosaic of the full Moon has been produced at a scale of 1:2 300 000. A control grid was produced for guiding the mosaicking of the isodensitracing as an ortho- graphic projection of the system of selenographic coordinates in the direction of the observing station ac- cording to the deduced topocentric libration of the epoch. The source of photometric error due to the spectral mismatch between photoelectric and photographic photometry is fully investigated and found to be negligible. This conclusion also applies to the U.S. Geological Survey 1:5 000000 albedo map. Since recent results indicate that correction to a true phase angle of zero is often too large to be a blanket correc- tlo over the whole lunar face and is also variable according to the geologic nature of the terrain, a graphi- cal device has been produced that allows one to read the true phase angle applicable at any selenographic coordinate for either the 1:5000000 albedo map or the 1:2500000 iso den sity mosaic. The new calibration has been rendered in terms of "infranormal" albedo, an observational lower bound to the true normal al- bedo, which can easily be normalized at the investigator's discretion. An alternative absolute calibration method was employed, which produced agreement with the previous scale provided an effective wavelength of 5390 A is assumed. Analysis of the dependence on data scatter of the least-square relationship between photoelectric albedo and photographic density shows that an accurate curve has been obtained. The present document provides all necessary information for using and assessing the reliability of the 1:2 500000 iso- density mosaic, which is in five colors, now housed at the U.S. Geological Survey, Flagstaff, Arizona. Publication: The Astronomical Journal Pub Date: December 1974 DOI: 10.1086/111703 Bibcode: 1974AJ.....79.1471W Keywords: Albedo; Astronomical Photometry; Lunar Maps; Lunar Photography; Ubv Spectra; Black Body Radiation; Electrophotometry; Light Curve; Luminance; Mosaics; Optical Density; Spectral Energy Distribution; Lunar and Planetary Exploration full text sources ADS |