ASEC 2021 Lunar Surface Environments Added to the

Why add lunar environments? 4 2024 set as date to return to the Moon
December 2017: Return to the moon 2028
March 2019: Date changed to 2024
April 2021: A provider was selected to build a lander<br>

Lunar Relevant Additions to SLS-SPEC-159 3.4 Lunar Surface Operational Phases
3.4.1 Lunar Surface Geological and Geomorphological Environment
3.4.2 Lunar Regolith Properties
3.4.3 Lunar Surface Plasma Environment
3.4.4 Lunar Regolith Electrical Properties
3.4.5 Optical Properties
3.4.6 Lunar Thermal Environment
3.4.7 Lunar Ionizing Radiation Environment
3.4.8 Lunar Meteoroid and Ejecta Environment
3.4.9 Lunar Illumination
3.4.10 Lunar Neutral Atmosphere 5<br>

Lunar Relevant Additions to SLS-SPEC-159 3.4.1 Lunar Surface Geological and Geomorphological Environment
3.4.1.1 Crater Size-Frequency Distribution
3.4.1.2 Crater Topography
3.4.1.3 Lunar Surface Topography, Slope Distributions, and Roughness
3.4.1.4 Rocks and Rock Size Distribution
3.4.2 Lunar Regolith Properties
3.4.2.1 General Description of the Lunar Regolith
3.4.2.2 Particle Size and Shape
3.4.2.3 Mechanical Properties of Lunar Regolith
3.4.2.4 Derived Physical Properties 6 NASA / JPL-Caltech / University of Arizona LPL / Gary Rennilson Apollo 15 Surveyor 7<br>

Lunar Relevant Additions to SLS-SPEC-159 3.4.3 Lunar Surface Plasma Environment
3.4.4 Lunar Regolith Electrical Properties
3.4.4.1 Bulk conductivity
3.4.4.2 Dielectric constant
3.4.4.3 Loss Tangent
3.4.5 Optical Properties
3.4.5.1 Visible and Near-Infrared Properties
3.4.5.2 Radar Properties 7<br>

Lunar Relevant Additions to SLS-SPEC-159 3.4.6 Lunar Thermal Environment
3.4.6.1 Lunar surface radiative environment
3.4.6.1.1 Albedo and emissivity
3.4.6.2 Lunar surface thermal properties
3.4.6.2.1 Thermal conductivity
3.4.6.2.2 Heat capacity (specific heat)
3.4.6.2.3 Thermal diffusivity
3.4.6.3 Surface Temperature
3.4.6.4 Subsurface Temperature

HLS-UG-001 Lunar Thermal Guidebook
Describes how to apply DSNE thermal environments in thermal analysis tools 8<br>

Lunar Relevant Additions to SLS-SPEC-159 3.4.7 Lunar Ionizing Radiation Environment
3.4.7.1 Lunar Surface Total Ionizing Dose
3.4.7.2 Lunar Surface Single Event Effects Environment
3.4.7.3 Lunar Neutron Environment
3.4.8 Lunar Meteoroid and Ejecta Environment
3.4.8.1 Primary Meteoroid Environment
3.4.8.2 Meteoroid Ejecta Environment
3.4.9 Lunar Illumination
3.4.10 Lunar Neutral Atmosphere 9<br>

Summary 10 There are more environments
Focused on lunar surface today
Plasma, radiation, dose, etc in Cis-Lunar
Looking at early next year for Rev J


SLS-SPEC-159 DSNE is available on NTRS<br>