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46 results on '"Hilgemann, Evan"'

1. The Habitable Exoplanet Observatory (HabEx) Mission Concept Study Final Report

Author

Gaudi, B. Scott, Seager, Sara, Mennesson, Bertrand, Kiessling, Alina, Warfield, Keith, Cahoy, Kerri, Clarke, John T., Domagal-Goldman, Shawn, Feinberg, Lee, Guyon, Olivier, Kasdin, Jeremy, Mawet, Dimitri, Plavchan, Peter, Robinson, Tyler, Rogers, Leslie, Scowen, Paul, Somerville, Rachel, Stapelfeldt, Karl, Stark, Christopher, Stern, Daniel, Turnbull, Margaret, Amini, Rashied, Kuan, Gary, Martin, Stefan, Morgan, Rhonda, Redding, David, Stahl, H. Philip, Webb, Ryan, Alvarez-Salazar, Oscar, Arnold, William L., Arya, Manan, Balasubramanian, Bala, Baysinger, Mike, Bell, Ray, Below, Chris, Benson, Jonathan, Blais, Lindsey, Booth, Jeff, Bourgeois, Robert, Bradford, Case, Brewer, Alden, Brooks, Thomas, Cady, Eric, Caldwell, Mary, Calvet, Rob, Carr, Steven, Chan, Derek, Cormarkovic, Velibor, Coste, Keith, Cox, Charlie, Danner, Rolf, Davis, Jacqueline, Dewell, Larry, Dorsett, Lisa, Dunn, Daniel, East, Matthew, Effinger, Michael, Eng, Ron, Freebury, Greg, Garcia, Jay, Gaskin, Jonathan, Greene, Suzan, Hennessy, John, Hilgemann, Evan, Hood, Brad, Holota, Wolfgang, Howe, Scott, Huang, Pei, Hull, Tony, Hunt, Ron, Hurd, Kevin, Johnson, Sandra, Kissil, Andrew, Knight, Brent, Kolenz, Daniel, Kraus, Oliver, Krist, John, Li, Mary, Lisman, Doug, Mandic, Milan, Mann, John, Marchen, Luis, Marrese-Reading, Colleen, McCready, Jonathan, McGown, Jim, Missun, Jessica, Miyaguchi, Andrew, Moore, Bradley, Nemati, Bijan, Nikzad, Shouleh, Nissen, Joel, Novicki, Megan, Perrine, Todd, Pineda, Claudia, Polanco, Otto, Putnam, Dustin, Qureshi, Atif, Richards, Michael, Riggs, A. J. Eldorado, Rodgers, Michael, Rud, Mike, Saini, Navtej, Scalisi, Dan, Scharf, Dan, Schulz, Kevin, Serabyn, Gene, Sigrist, Norbert, Sikkia, Glory, Singleton, Andrew, Shaklan, Stuart, Smith, Scott, Southerd, Bart, Stahl, Mark, Steeves, John, Sturges, Brian, Sullivan, Chris, Tang, Hao, Taras, Neil, Tesch, Jonathan, Therrell, Melissa, Tseng, Howard, Valente, Marty, Van Buren, David, Villalvazo, Juan, Warwick, Steve, Webb, David, Westerhoff, Thomas, Wofford, Rush, Wu, Gordon, Woo, Jahning, Wood, Milana, Ziemer, John, Arney, Giada, Anderson, Jay, Maíz-Apellániz, Jesús, Bartlett, James, Belikov, Ruslan, Bendek, Eduardo, Cenko, Brad, Douglas, Ewan, Dulz, Shannon, Evans, Chris, Faramaz, Virginie, Feng, Y. Katherina, Ferguson, Harry, Follette, Kate, Ford, Saavik, García, Miriam, Geha, Marla, Gelino, Dawn, Götberg, Ylva, Hildebrandt, Sergi, Hu, Renyu, Jahnke, Knud, Kennedy, Grant, Kreidberg, Laura, Isella, Andrea, Lopez, Eric, Marchis, Franck, Macri, Lucas, Marley, Mark, Matzko, William, Mazoyer, Johan, McCandliss, Stephan, Meshkat, Tiffany, Mordasini, Christoph, Morris, Patrick, Nielsen, Eric, Newman, Patrick, Petigura, Erik, Postman, Marc, Reines, Amy, Roberge, Aki, Roederer, Ian, Ruane, Garreth, Schwieterman, Edouard, Sirbu, Dan, Spalding, Christopher, Teplitz, Harry, Tumlinson, Jason, Turner, Neal, Werk, Jessica, Wofford, Aida, Wyatt, Mark, Young, Amber, and Zellem, Rob

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The Habitable Exoplanet Observatory, or HabEx, has been designed to be the Great Observatory of the 2030s. For the first time in human history, technologies have matured sufficiently to enable an affordable space-based telescope mission capable of discovering and characterizing Earthlike planets orbiting nearby bright sunlike stars in order to search for signs of habitability and biosignatures. Such a mission can also be equipped with instrumentation that will enable broad and exciting general astrophysics and planetary science not possible from current or planned facilities. HabEx is a space telescope with unique imaging and multi-object spectroscopic capabilities at wavelengths ranging from ultraviolet (UV) to near-IR. These capabilities allow for a broad suite of compelling science that cuts across the entire NASA astrophysics portfolio. HabEx has three primary science goals: (1) Seek out nearby worlds and explore their habitability; (2) Map out nearby planetary systems and understand the diversity of the worlds they contain; (3) Enable new explorations of astrophysical systems from our own solar system to external galaxies by extending our reach in the UV through near-IR. This Great Observatory science will be selected through a competed GO program, and will account for about 50% of the HabEx primary mission. The preferred HabEx architecture is a 4m, monolithic, off-axis telescope that is diffraction-limited at 0.4 microns and is in an L2 orbit. HabEx employs two starlight suppression systems: a coronagraph and a starshade, each with their own dedicated instrument., Comment: Full report: 498 pages. Executive Summary: 14 pages. More information about HabEx can be found here: https://www.jpl.nasa.gov/habex/

Published
2020

20. Development of Low-Scatter Optical Edges for Starshades

Author

Bradley, Christine, McKeithen, Dylan, Lisman, Douglas, Martin, Stefan, Shaklan, Stuart, Webb, David, Hilgemann, Evan, Lee, Hyeong Jae, and Steeves, John

Abstract

Starshades, combined with future space telescopes, provide the ability to detect Earth-like exoplanets in the habitable zone by producing high contrast ratios at small inner working angles. The primary function of a starshade is to suppress light from a target star such that its orbiting planets are revealed. In order to do so, the optical edges of the starshade must maintain their precise in-plane profile to produce the necessary apodization function. However, an equally important consideration is the interaction of these edges with light emanating from our own Sun as scattered and/or diffracted sunlight can significantly degrade the achievable contrast. This paper describes the technical efforts performed to obtain precision, low-scatter optical edges for future starshades. Trades between edge radius (i.e. sharpness) and surface reflectivity have been made and small-scale coupons have been produced using scalable manufacturing processes. A custom scattered light testbed has been developed to quantify the magnitude of scattered light over all sun angles. Models have also been developed to make predictions on the level of reflected and/or diffracted light for various edge architectures. The results of these studies have established a current baseline approach which implements photochemical etching techniques on thin metal foils.

Published
2018

25. Strandbeests on Venus

Author

Sauder, Jonathan, Hilgemann, Evan, Kawata, Jessie, Stack, Katie, Parness, Aaron, and Johnson, Michael

Published
2017

26. Strandbeests on Venus

Author

Johnson, Michael, Parness, Aaron, Stack, Katie, Kawata, Jessie, Hilgemann, Evan, and Sauder, Jonathan

Abstract

UNKNOWN

Published
2017

27. An Automaton Rover Enabling Long Duration In-Situ Science in Extreme Environments

Author

Parness, Aaron, Bienstock, Bernard, Hilgemann, Evan, and Sauder, Jonathan

Abstract

The Automaton Rover for Extreme Environments (AREE) is a NASA Innovative Advanced Concept (NIAC) funded study focused on enabling long duration science on Venus by replacing vulnerable electronics with an entirely mechanical design. By utilizing high temperature alloys, the rover would survive on the surface of Venus for weeks if not months. The rover concept harvests wind energy using a turbine and stores it in a constant force spring. The mobility system would be guided by a mechanical computer and logic system, programed to carry out the mission. It would collect basic science data such as wind speed, temperature, and seismic events. Communicating the data back to Earth is the most challenging aspect of the system design with multiple options being explored in a trade: a simple electronic high temperature transponder, a retroreflector target or inscribing phonograph style records to be launched via a balloon to a high altitude drone capable of transmitting the data back to Earth. AREE is not only a new exciting in-situ rover concept, but also a paradigm shift to conducting in-situ science in extreme environments. Traditional extreme environment vehicles collect as many diverse data points as possible in the short period of time before system failure. AREE breaks that trend by exploring what can be done with only a few basic scientific measurements, but recorded over long periods of time. In addition to Venus, the concept can be useful in other extreme environments in the solar system including Mercury, Jupiter's radiation belts, the interiors of gas giants, the mantle of the Earth and volcanoes throughout the solar system.

Published
2017

29. Automation Rover for Extreme Environments

Author

Sauder, Jonathan, Hilgemann, Evan, Johnson, Michael, Parness, Aaron, Hall, Jeffrey, Kawata, Jessie, and Stack, Kathryn

Subjects
Lunar And Planetary Science And Exploration
Abstract

Almost 2,300 years ago the ancient Greeks built the Antikythera automaton. This purely mechanical computer accurately predicted past and future astronomical events long before electronics existed1. Automata have been credibly used for hundreds of years as computers, art pieces, and clocks. However, in the past several decades automata have become less popular as the capabilities of electronics increased, leaving them an unexplored solution for robotic spacecraft. The Automaton Rover for Extreme Environments (AREE) proposes an exciting paradigm shift from electronics to a fully mechanical system, enabling longitudinal exploration of the most extreme environments within the solar system.

Published
2017

38. Castable Bulk Metallic Glass Strain Wave Gears: Towards Decreasing the Cost of High-Performance Robotics

Author

Hofmann, Douglas C., primary, Polit-Casillas, Raul, additional, Roberts, Scott N., additional, Borgonia, John-Paul, additional, Dillon, Robert P., additional, Hilgemann, Evan, additional, Kolodziejska, Joanna, additional, Montemayor, Lauren, additional, Suh, Jong-ook, additional, Hoff, Andrew, additional, Carpenter, Kalind, additional, Parness, Aaron, additional, Johnson, William L., additional, Kennett, Andrew, additional, and Wilcox, Brian, additional

Published
2016
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43. ON-OFF Adhesive Grippers for Earth-Orbit

Author

Parness, Aaron, primary, Heverly, Matthew, additional, Hilgemann, Evan, additional, Copel, Daniel, additional, Wettels, Nicholas, additional, Hilgendorf, Tyler, additional, White, Victor, additional, and Kennedy, Brett, additional

Published
2013
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45. Dynamic surface grasping with directional adhesion.

Author

Hawkes, Elliot W., Christensen, David L., Eason, Eric V., Estrada, Matthew A., Heverly, Matthew, Hilgemann, Evan, Jiang, Hao, Pope, Morgan T., Parness, Aaron, and Cutkosky, Mark R.

Abstract

Dynamic surface grasping is applicable to landing of micro air vehicles (MAVs) and to grappling objects in space. In both applications, the grasper must absorb the kinetic energy of a moving object and provide secure attachment to a surface using, for example, gecko-inspired directional adhesives. Functional principles of dynamic surface grasping are presented, and two prototype grasper designs are discussed. Computer simulation and physical testing confirms the expected relationships concerning (i) the alignment of the grasper at initial contact, (ii) the absorption of energy during collision and rebound, and (iii) the force limits of synthetic directional adhesives. [ABSTRACT FROM PUBLISHER]

Published
2013
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46. Let’s Dance.

Author

Hilgemann, Evan

Subjects
*COVID-19 pandemic, *ORION Nebula, *CRAB Nebula, *LIGHT sources, *RECLINING chairs
Abstract

The daytime high was only a few degrees above zero Fahrenheit, and the temperature dropped precipitously lower as the Sun set below a cloudless horizon - a rarity for a region more familiar in winter with overcast, gunmetal-grey skies. COLUMNS / DEPARTMENTS THE BEST NIGHT of stargazing I've ever had was at a Boy Scout ranch in central Iowa when I was about 13 years old. EVAN HILGEMANN is a mechanical engineer at NASA's Jet Propulsion Laboratory and a telescope operator at Griffith Observatory, but he still thinks of himself as from Omaha, NE. [Extracted from the article]

Published
2022

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