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NASA Technical Reports Server (NTRS) 20170007365: Illumination Cond...
by NASA Technical Reports Server (NTRS)
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We produced 400 x 400 km Digital Terrain Models (DTMs) of
the lunar poles from Lunar Orbiter Laser Altimeter (LOLA)
ranging measurements. To achieve consistent, high-
resolution DTMs of 20 m/pixel the individual ranging
profiles were adjusted to remove small track-to-track o
sets. We used these LOLADTMs to simulate illumination
conditions at surface level for 50 x 50 km regions
centered on the poles. Illumination was derived in one-
hour increments from 01 January, 2017 to 01 January, 2037
to cover the lunar precessional cycle of 18.6 years and
to determine illumination conditions over several future
mission cycles. We identified three regions receiving
high levels of illumination at each pole, e.g. the
equator-facing crater rims of Hinshelwood, Peary and
Whipple for the north pole and the rim of Shackleton
crater, and two locations on a ridge between Shackleton
and de Gerlache crater for the south pole. Their average
illumination levels range from 69.5% to 82.9%, with the
highest illumination levels found at the north pole on
the rim of Whipple crater. A more detailed study was
carried out for these sites as targets for a lander
and/or rover equipped with solar arrays. For this purpose
we assumed a lander with a structural height of two
meters above the ground (height of the solar panels).
Here average illumination levels range from 77.1% to
88.0%, with the maximum found at the ridge between
Shackleton and de Gerlache crater on the south pole.
Distances, sizes and slopes of nearby Permanently
Shadowed Regions (PSRs) as a prime science target were
also assessed in this case.
Date Published: 2022-06-29 17:27:10
Identifier: NASA_NTRS_Archive_20170007365
Item Size: 17669562
Language: english
Media Type: texts
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