Abstract
We have acquired a comprehensive laboratory bidirectional measurements of Apollo 11 and Apollo 16 lunar soil samples and have successfully fit photometric models to the laboratory data and have determined the solar spectrum averaged hemispheric reflectance as a function of incidence angle. The Apollo 11 (sample 10,084) and 16 (sample 68,810) soil samples are two representative end member samples from the Moon, dark lunar maria and bright lunar highlands. We used our solar spectrum averaged albedos in a thermal model and compared our model-calculated normal bolometric infrared emission curves with those measured by the LRO Diviner Lunar Radiometer Experiment. We found excellent agreement at the Apollo 11 site, but at the Apollo 16 site, we found that the albedos we measured in the laboratory were 33% brighter than those required to fit the Diviner infrared data. We attribute this difference at Apollo 16 to increased compaction and decreased maturity of the laboratory sample relative to the natural lunar surface, and to local variability in surface albedos at the Apollo 16 field area that are below the spatial resolution of Diviner.
| Original language | English (US) |
|---|---|
| Article number | 113456 |
| Journal | Icarus |
| Volume | 336 |
| DOIs | |
| State | Published - Jan 15 2020 |
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Keywords
- Moon
- Photometry
- Radiative transfer
- Surface
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
Cite this
The bidirectional and directional hemispheric reflectance of Apollo 11 and 16 soils : Laboratory and diviner measurements. / Foote, Emily J.; Paige, David A.; Shepard, Michael K.; Johnson, Jeffrey R.; Biggar, Stuart.
In: Icarus, Vol. 336, 113456, 15.01.2020.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The bidirectional and directional hemispheric reflectance of Apollo 11 and 16 soils
T2 - Laboratory and diviner measurements
AU - Foote, Emily J.
AU - Paige, David A.
AU - Shepard, Michael K.
AU - Johnson, Jeffrey R.
AU - Biggar, Stuart
PY - 2020/1/15
Y1 - 2020/1/15
N2 - We have acquired a comprehensive laboratory bidirectional measurements of Apollo 11 and Apollo 16 lunar soil samples and have successfully fit photometric models to the laboratory data and have determined the solar spectrum averaged hemispheric reflectance as a function of incidence angle. The Apollo 11 (sample 10,084) and 16 (sample 68,810) soil samples are two representative end member samples from the Moon, dark lunar maria and bright lunar highlands. We used our solar spectrum averaged albedos in a thermal model and compared our model-calculated normal bolometric infrared emission curves with those measured by the LRO Diviner Lunar Radiometer Experiment. We found excellent agreement at the Apollo 11 site, but at the Apollo 16 site, we found that the albedos we measured in the laboratory were 33% brighter than those required to fit the Diviner infrared data. We attribute this difference at Apollo 16 to increased compaction and decreased maturity of the laboratory sample relative to the natural lunar surface, and to local variability in surface albedos at the Apollo 16 field area that are below the spatial resolution of Diviner.
AB - We have acquired a comprehensive laboratory bidirectional measurements of Apollo 11 and Apollo 16 lunar soil samples and have successfully fit photometric models to the laboratory data and have determined the solar spectrum averaged hemispheric reflectance as a function of incidence angle. The Apollo 11 (sample 10,084) and 16 (sample 68,810) soil samples are two representative end member samples from the Moon, dark lunar maria and bright lunar highlands. We used our solar spectrum averaged albedos in a thermal model and compared our model-calculated normal bolometric infrared emission curves with those measured by the LRO Diviner Lunar Radiometer Experiment. We found excellent agreement at the Apollo 11 site, but at the Apollo 16 site, we found that the albedos we measured in the laboratory were 33% brighter than those required to fit the Diviner infrared data. We attribute this difference at Apollo 16 to increased compaction and decreased maturity of the laboratory sample relative to the natural lunar surface, and to local variability in surface albedos at the Apollo 16 field area that are below the spatial resolution of Diviner.
KW - Moon
KW - Photometry
KW - Radiative transfer
KW - Surface
UR - http://www.scopus.com/inward/record.url?scp=85074257756&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85074257756&partnerID=8YFLogxK
U2 - 10.1016/j.icarus.2019.113456
DO - 10.1016/j.icarus.2019.113456
M3 - Article
AN - SCOPUS:85074257756
VL - 336
JO - Icarus
JF - Icarus
SN - 0019-1035
M1 - 113456
ER -