National Aeronautics and Space Administration

Human Exploration of Phobosand Robotic Precursor Mission

Human Spaceflight Architecture Mars Moons Team

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Mars Moons Trade Tree Based on Campaign Team & Transportation Team Recommendations &

Discussions

Destinations

Phobos Only

Deimos Only

Phobos + Deimos

Mars Moon Habitat

Phobos / Deimos Surface

Static

Relocatable

Phobos Parking Orbit

L1

L4 / L5

DRO

Pre-Staged Assets

None

Mars Moon Habitat

Mars Moon Habitat

+ PEV(s)

Transportation

Loitering Hab

Dual Hab

Conjunction Class

Direct to Phobos

Earth Transit Stack

in HMO

Free-Return Trajectory

Work-systems

Jetpacks

SEV-class

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Pressurized Excursion

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Mars Lander Class

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Phobos Exploration EVA Timeline Analysis

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Unpressurized Excursion VehicleJetpacks (+ Mobile Payload Carrier)

Pressurized Excursion Vehicle

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Contingency Return Estimates

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PEV Options

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Habitat

Dust Tolerance & Mitigation

EVA Systems

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2x PEV(1 as Taxi)

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2x PEV(1 as Taxi)

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1x PEV

Log Modules

2x PEV(1 as Taxi)

Minimal Taxi / Lander

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Phobos Mission Mass (deltas to MarsOrbital Mission)

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How Long to Complete

(From Phase 1 analysis, 100% = Standard EVA task circuit completed at 11 regions x 5 sites per region)

Cases 2.1, 2.2, 2.3, 2.4, & 2.7

Case 2.6

Phobos Hopper ATHLETE (6 Limbs)

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Airlock (with 14.7 psi / 21% O2)

Airlock:ISLE Prebreathe Protocol: 3h 39 minAirlock Egress: 5 min Jetpack Donning & Checkout: ~15 minJetpack Doffing & Configuration for Recharge: ~15 minSuit cleaning & verification: minimum 20 minAirlock Ingress: 10 min

Total Overhead: 4h 44 minWork Efficiency Index: 1.37 (assumes 6.5 hr EVA)

Suit Port (with Exploration Atmosphere):

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Mars Moons Task Conceptual Design

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