Digital Commons Network^™

Near Earth Asteroid Scout - Mission Update, Les Johnson, Erin Betts, Andrew Heaton, Clif Jones, Leslie Mcnutt, Matt Pruitt, Jim Stott, Darren Wallace, Rick Wilson, Julie Castillo-Rogez, Gregory Lantoine, Calina Seybold, Ted Sweetser

Small Satellite Conference

After its deployment from NASA’s Space Launch System (SLS), the Near-Earth Asteroid (NEA) Scout mission will travel to and image an asteroid during a close flyby using an 86m2 solar sail as its primary propulsion. Solar sails are large, mirror-like structures made of a lightweight material that reflects sunlight to propel the spacecraft. The continuous solar photon pressure provides thrust with no need for the heavy, expendable propellants used by conventional chemical and electric propulsion systems. Developed by NASA’s Marshall Space Flight Center (MSFC) and Jet Propulsion Laboratory (JPL), the NEA Scout is based on the industry-standard CubeSat form factor. …

Capstone: A Summary Of Flight Operations To Date In The Cislunar Environment, Thomas Gardner, Brad Cheetham, Jeff Parker, Alec Forsman, Ethan Kayser, Michael Thompson, Connor Ott, Lauren Demoudt, Matt Bolliger, Arlen Kam, Keith Thompson, Tristan Latchu, Rebecca Rogers, Brennan Bryant, Tomas Svitek

Small Satellite Conference

The cislunar environment is about to get much busier and with this increase in traffic comes an increase in the demand for limited resources such as Earth based tracking of and communications with assets operating in and around the Moon. With the number of NASA, commercial, and international missions to the Moon growing rapidly, the need to make these future endeavors as efficient as possible is a challenge that is being solved now. Advanced Space is aiming to mitigate these resource limitations by enabling spacecraft in the cislunar environment to navigate autonomously and reduce the need for oversubscribed ground assets …

The Eastern Atomic Rise: Defining Nuclear Hegemony In A Multi-Lateral World, Eric Rodriguez

Capstone Collection

Most existing literature in the field of international relations on the hegemonic dimension of nuclear technology is written from a realist, western perspective within the context of the Cold War. It focuses on its military, defense, and security dimensions, non-proliferation and safety, and some analyses of hegemony from a cultural media perspective. This theory-building paper offers contrasting understanding of nuclear hegemony, which recognizes three recent developments: 1) diminished Western Hegemony in nuclear technology; 2) growing Chinese nuclear capacity in energy geopolitics; and 3) growing concerns about global energy security. This paper begins with an overview of these developments and a …

Magazine Article By J.S. Seybold Regarding The Construction Of The Garrison Dam, October, 1949, J.S. Seybold

Usher Burdick Papers

This reprint of an article in Civil Engineering, The Magazine of Engineered Construction, dated October, 1949, by Colonel of the United States Corps of Engineers J.S. Seybold is a publication of the North Dakota State Water Conservation Commission. The six page article provides pictures and diagrams outlining the progress of the Garrison Dam project and is divided by the following subtopics: Seepage Control and Drainage, Driving Cutoff Piling, Eight Tunnels in Right Abutment, Test Tunnel on Site of Penstock No. 4, Measurements Provide Design Data, Intake Structure Contract Let, Spillway in Left Abutment, Permanent Town Built, Progress to Date. The …

Low-Thrust Reconfiguration Strategy For Flexible Satellite Constellations, Federica Paganelli Azza, Pietro De Marchi, Matteo Stoisa, Paolo Gennaro Madonia

Small Satellite Conference

Flexible and responsive space systems are needed to satisfy changing mission requirements and react to unforeseen challenges. Reconfigurable constellations are a promising approach to overcome limitations of the current design philosophy, offering operators the ability to actively adapt the constellation configuration to future needs, promptly modifying their pattern to focus the available resources towards dynamic objectives. This work introduces a low-thrust reconfiguration strategy to optimize these constellations through a multiobjective Genetic Algorithm able to trade-off between observation performance over a desired target area and maneuvering cost to reach the new pattern. The presented approach is validated in a LEO scenario, …

Gei-Sat Constellation For Greenhouse Gases Detection And Quantification, Marcos Ubierna, Manuel Montesino, Eider Ocerin, Roberto Fabrizi, Tania Meixus Fernandez

Small Satellite Conference

GEI-SAT constellation will embark SATLANTIS’ solution for methane emissions detection and quantification. GEI-SAT pursues hot spot mapping of low emission levels of methane with a low-mass and low-cost very high-resolution multispectral SWIR camera onboard CubeSats & Microsats. The overall mission consists of: GEI-SAT Precursor, a 16U CubeSat (17.4 kg, ~150 kg/h detection threshold, 1.65 m resolution @VNIR and 13 m resolution @SWIR, up to 1700 nm) to be launched in Q1 2023; GEI-SAT Plus, a Microsat (92 kg, ~100 kg/h detection threshold, 0.8 m resolution @VNIR and ~7 m resolution @SWIR, up to 1700 nm) to be launched in Q4 …

On Trusting Third-Party Satellite Data, Sean Crosby, Kurt Brenning

Small Satellite Conference

Increased access to space has opened the door to many satellite vendors. These vendors are collecting data using a variety of sensors, including electro-optical, radio frequency, and synthetic aperture radar. Customers want true-sourced, authentic data. However, as with any lower barrier to entry, the risk of counterfeit, tampered, or low-quality products increases. In this work, we describe the key requirements for trusting imagery and present a hardware design and a system of controls that meet those requirements of trust for Earth imaging satellites. Our trusted hardware provides assurance of capture time, location, and preserves the content and origin by capturing …

Press Statement From Representatives Burdick And Lemke Regarding Limitation On The Pool Level, October 5, Usher L. Burdick

Usher Burdick Papers

This press statement dated October 5 (no year indicated), by United States (US) Representatives Usher L. Burdick and William Lemke states that “it was no surprise” that the United States Army Engineers have tried to create a larger pool area for the Garrison Dam than 17 million acre feet. The press statement states that this matter should be immediately placed before the federal courts in the form of an injunction to prevent the Army Engineers from breaking the law. No year is marked in this document.

Developing Lunar Flashlight And Near-Earth Asteroid Scout Flight Software Concurrently Using Open-Source F Prime Flight Software Framework, Aadil Rizvi, Kevin F. Ortega, Yutau He

Small Satellite Conference

NASA’s Lunar Flashlight (LF) and Near-Earth Asteroid (NEA) Scout CubeSat missions are planned to launch in 2022. Lunar Flashlight is a low-cost secondary payload concept that will map the lunar South Pole for volatiles and demonstrate several technological firsts, including the first planetary CubeSat mission to use green propulsion, and the first mission to use lasers to look for water ice. NEA Scout is a low-cost concept that will map an asteroid and demonstrate several technological firsts, including being the first CubeSat to reach an asteroid.

Flight software for both CubeSat missions is based on the open-source F Prime Flight …

Asteria In-Orbit Testing On Opssat: An On-Board Autonomous Orbit Control Solution Including Collision Risks Avoidance, Francois Toussaint, Jerome Thomassin, Sophie Laurens

Small Satellite Conference

For several years, CNES has been working on Flight Dynamics algorithms to ensure high level of autonomy for next generation of space missions. One example of these autonomous techniques is the Autonomous Orbital Control, which consists of delegating to onboard satellite system the identification, planning and realization of orbital corrections to stay in the mission reference orbit. ASTERIA, an application of on-board autonomy combining station keeping and collision risk management for the low earth orbit satellites, enables both in-track and cross-track control for different LEO missions. The on-board collision risk management process is fully integrated into the autonomous station keeping …

Disksat: Demonstration Mission For A Two-Dimensional Satellite Architecture, Richard Welle, Catherine Venturini, David Hinkley, Joseph Gangestad, Sara Grasso, Anastasia Muszynski, Roger Hunter, Chad Frost, David Mayer, Christopher Baker

Small Satellite Conference

The DiskSat is a quasi-two-dimensional satellite bus architecture designed for applications requiring high power, large apertures, and/or high maneuverability in a low-mass containerized satellite. A representative DiskSat structure is a composite flat panel, one meter in diameter and 2.5 cm thick. The volume is almost 20 liters, equivalent to a hypothetical 20U CubeSat, while the structural mass is less than 3 kg. The surface area is large enough to host over 200 W of solar cells without deployable solar panels. For launch, multiple DiskSats are stacked in a fully enclosed container/deployer using a simple mechanical interface and are released individually …

Brush Me With Honey, Cammy Thomas

Appalachia

No abstract provided.

Thoreau Listens For The Warblers, Todd Davis

Appalachia

No abstract provided.

Going To Walden, Mary Oliver

Appalachia

No abstract provided.

Refraction, Cammy Thomas

Appalachia

No abstract provided.

The Ivory-Billed Woodpecker, Francis Lunney

Appalachia

No abstract provided.

For Now, Ann Taylor

Appalachia

No abstract provided.

The Snow Has No Voice, John Smelcer

Appalachia

No abstract provided.

Blueberry Island, Thoreau Raymond

Appalachia

No abstract provided.

Mount Rainier, Kay Mullen

Appalachia

No abstract provided.

A Peak Ahead: Resource Conflicts In The Backcountry, Christine Woodside

Appalachia

No abstract provided.

Books Of Note

Appalachia

No abstract provided.

Research

Appalachia

No abstract provided.

Letters

Appalachia

No abstract provided.

News And Notes

Appalachia

No abstract provided.

Alpina

Appalachia

No abstract provided.

Accidents

Appalachia

No abstract provided.

Narragansett Marathon: Just Before Leaving His Native Connecticut For Wyoming, A Young Explorer Finally Takes A 50-Mile Trek From His Parents' Doorstep, Tom Fagin

Appalachia

No abstract provided.

Waterman Fund Essay Contest Winner: A Place For Everything: A Bear Wanders Into A Crowded Campground, Katherine Dykstra

Appalachia

No abstract provided.

Wildlife Encounters In The Canadian Rockies: Life Lessons From A Marmot, And Other Meetings, Lisa Densmore

Appalachia

No abstract provided.