The extreme ultraviolet albedos of the planet Mercury and of the Moon

The albedo of the planet Mercury was measured at eight wavelengths from 584 to 1657 A and at solar phase angles between 50° and 120°. The geometric albedo varies from 4.1±0.7% at 584 A to 1.7±0.5% at 1657 A. The albedo of the moon was measured at solar phase angle 74° for the same wavelengths, and the geometric albedo varies from 6.4±1% at 584 A to 2.2±0.5% at 1657 A. The difference in albedo of the two objects may be due to the surface material or particle size or both; there are not sufficient experimental data at these short wavelengths to make a clear distinction.