Ratio of a celestial body's brightness to that of a Lambertian ideal
In astronomy, the geometric albedo of a celestial body is the ratio of its actual brightness as seen from the light source (i.e. at zero phase angle) to that of an idealized flat, fully reflecting, diffusively scattering (Lambertian) disk with the same cross-section. (This phase angle refers to the direction of the light paths and is not a phase angle in its normal meaning in optics or electronics.)
Diffuse scattering implies that radiation is reflected isotropically with no memory of the location of the incident light source. Zero phase angle corresponds to looking along the direction of illumination. For Earth-bound observers, this occurs when the body in question is at opposition and on the ecliptic.
The visual geometric albedo refers to the geometric albedo quantity when accounting for only electromagnetic radiation in the visible spectrum.
In astronomy, the geometricalbedo of a celestial body is the ratio of its actual brightness as seen from the light source (i.e. at zero phase angle) to...
Albedo (/ælˈbiːdoʊ/ al-BEE-doh; from Latin albedo 'whiteness') is the fraction of sunlight that is diffusely reflected by a body. It is measured on a...
reliable data for measuring their Bond albedo comes from spacecraft. The Bond albedo (A) is related to the geometricalbedo (p) by the expression A = p q {\displaystyle...
of albedo such as the geometricalbedo, which can be above 1. In general, though, the Bond albedo may be greater or smaller than the geometricalbedo, depending...
satellites are calculated from their absolute magnitudes with an assumed geometricalbedo of 0.04, which is the average value for that population. Masses of...
these categories are subject to change with further evidence. The geometricalbedo A {\displaystyle A} is calculated from the measured absolute magnitude...
Varuna is dark, with a measured geometricalbedo of 0.127 based on thermal observations in 2013. Varuna's geometricalbedo is similar to that of the possible...
were the first ever to have their reflectivity (or geometricalbedo) measured. The geometricalbedos of Spica A and B are, respectively, 3.61 percent and...
magnitude of 0.05. Makemake has a highly reflective surface with a geometricalalbedo of 0.82±0.02. The rotation period of Makemake is estimated at 22.83...
a geometricalbedo of 0.19±0.02. By comparison, the MIPS photometer on the Spitzer Space Telescope gives a diameter of 88.30±8.51 km and a geometric albedo...
planets. Salacia is at the upper end of this size range and has a very low albedo, though Grundy et al. later found it to have the relatively high density...
their disappearance in 2001 (when the rings were edge-on). Also, the geometricalbedo of Chiron's rings as determined by spectroscopy is consistent with...
with the IRAS observatory give a diameter of 145.70 ± 5.89 km and a geometricalbedo of 0.03 ± 0.01. By comparison, the MIPS photometer on the Spitzer Space...
derive other albedo and scattering properties, such as the geometricalbedo, the phase integral, and the Bond albedo. AlbedoGeometricalbedo Bidirectional...
occultation was recorded on 14 January 2022; full results on size, shape, geometricalbedo, and the spin-axis orientation have not been released[needs update]...
710 km (440 mi), with an optical absolute magnitude of 3.77 and a geometricalbedo (reflectivity) of 0.11. Compared to Pluto and its moon Charon, Ixion...
more uniform light back at low phase angles. The definition of the geometricalbedo p {\displaystyle p} , a measure for the reflectivity of planetary surfaces...
likely lies between 400–600 km (250–370 mi) in diameter assuming a geometricalbedo range of 0.10–0.25. Sheppard estimates that 2018 AG37's diameter lies...
table shows that for bodies in the asteroid albedo range, the typical difference between Bond and geometricalbedo is 20% or less, with either quantity capable...
with the IRAS observatory give a diameter of 101.72 ± 5.18 km and a geometricalbedo of 0.06 ± 0.01. By comparison, the MIPS photometer on the Spitzer Space...
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