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Preliminary Thermal Predictions for CRaTER on the Latest LRO Geometry Model

This document outlines the thermal performance predictions for the Cosmic Ray Telescope for the Effects of Radiation (CRaTER) instrument, designed within the Lunar Reconnaissance Orbiter (LRO). It reflects updates from the previous spacecraft concept, focusing on the latest LRO geometry and thermal results from beta angles of 0° to 90°. Key parameters of the lunar environment influencing the thermal design are discussed, including solar constants, albedo, and emittance. The results inform future thermal management strategies for CRaTER aboard LRO.

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Preliminary Thermal Predictions for CRaTER on the Latest LRO Geometry Model

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  1. LRO CRaTERPreliminary Temperature PredictionsDesign A Concept  Old ConceptApril 12, 2005Cynthia Simmons/ESS

  2. Latest LRO Geometry ModelDesign A Concept CRaTER located on its own bench in old spacecraft concept Instrument Deck +X -Y Propulsion Module CRaTER Thermal Preliminary Results

  3. Beta 0° Beta 90° LRO Thermal Environment Orbit Parameters type lunar circular altitude 50 +/-20 Km inclination 90° orbit period 113. minutes full sun orbits beta 90.0° to 76.4° (55 days/yr) eclipsed orbits beta 76.4° to 0.0° (310 days/yr) max. eclipse 48. minutes (beta 0°) lunar orbit plane angle to earth 5.15° Lunar Thermal Environment solar constant 1420 - 1280 W/m2 (Hot to Cold) albedo factor 0.13 – 0.06 (0.073 average) Lunar emittance 1 – albedo factor infrared emission sunlit side varies (cosine from sub solar point) sub solar point 400 K (1335 W/m2) dark side 100 K (5.22 W/m2) CRaTER Thermal Preliminary Results

  4. Thermal Model AssumptionsFor CRaTER Instrument CRaTER Thermal Preliminary Results

  5. Preliminary Results (Steady-state) CRaTER Thermal Preliminary Results

  6. Latest LRO Geometry ModelDesign E Concept CRaTER location in latest spacecraft concept Instrument Deck Avionics Module Propulsion Module PAF Solar Array +X -Y NOTE: Star Trackers and solar array will be moved to new location. CRaTER Thermal Preliminary Results

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