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<!DOCTYPE HTML>
<!--
Hyperspace by HTML5 UP
html5up.net | @ajlkn
Free for personal and commercial use under the CCA 3.0 license (html5up.net/license)
-->
<html>
<head>
<title>Jonathan LeFevre Richmond</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no" />
<link rel="stylesheet" href="assets/css/main.css" />
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</head>
<body class="is-preload">
<!-- Sidebar -->
<section id="sidebar">
<div class="inner">
<nav>
<ul>
<li><a href="#intro">About</a></li>
<li><a href="#one">Education</a></li>
<li><a href="#two">Presentations and Papers</a></li>
<li><a href="#three">Projects</a></li>
<li><a href="#four">Contact</a></li>
</ul>
</nav>
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</section>
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<div id="wrapper">
<!-- Intro -->
<section id="intro" class="wrapper style1 fullscreen fade-up">
<a href="#" class="image"><img src="images/APL Headshot.jpg" alt="" style="width:630px;height:420px;" data-position="center center" /></a>
<div class=""content">
<div class="inner">
<h1>Jonathan LeFevre Richmond</h1>
<p>I am a PhD student in the School of Aeronautics and Astronautics at Purdue Univeristy where I am studying Astrodynamics and Space Applications with a
minor in Autonomy and Controls. As part of the Multi-Body Dynamics Research Group, I am advised by Professor Kathleen Howell. My research focuses on
transfers from cislunar orbits to deep-space targets (e.g., Mars) utilizing multi-body dynamics.</p>
<ul class="actions">
<li><a href="#three" class="button scrolly">Learn more about my research!</a></li>
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<!-- One -->
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<h2>Purdue University</h2>
<ul style="list-style-type:square">
<li>2025-present</li>
<li>Ph.D. Aeronautics and Astronautics (Astrodynamics and Space Applications)</li>
<li>2021-2024</li>
<li>M.S. Aeronautics and Astronautics (Astrodynamics and Space Applications)</li>
</ul>
</div>
</div>
<a href="#" class="image"><img src="images/PU.jpg" alt="" data-position="center center" /></a>
</section>
<section>
<a href="#" class="image"><img src="images/OSU.jpg" alt="" data-position="center center" /></a>
<div class="content">
<div class="inner">
<h2>The Ohio State University</h2>
<ul style="list-style-type:square">
<li>2017-2021</li>
<li>B.S. Aeronautical and Astronautical Engineering, <i>summa cum laude</i></li>
<li>Minor in Classical Humanities: Greek Civilization track</li>
</ul>
</div>
</div>
</section>
</section>
<!-- Two -->
<section id="two" class="wrapper style1 fade-up">
<div class="inner">
<h2>Conference Presentations</h2>
<ul style="list-style-type:circle">
<li>
<b>Jonathan H. LeFevre Richmond and Kathleen C. Howell</b>. 2026. "Cislunar-to-Deep-Space Transfer Design: Identifying Advantageous CR3BP Departure Orbit Families."
<i>ASCEND 2026</i>, Washington, D.C.
</li>
<li>
<b>Jonathan Richmond</b>. 2021. "Optimizing Trajectories for Unpowered Hypersonic Waveriders during Atmospheric Reentry." <i>AIAA SciTech Forum</i>, San Diego, CA.
</li>
<li>
Jeffrey Stuart, Emine Basak Alper Ramaswamy, and <b>Jonathan Richmond</b>. 2022. "Hindsight is 20/20: A Retrospective on Applying Interactive Visualization
Techniques to Mission Design & Navigation." <i>AAS/AIAA Astrodynamics Specialist Conference</i>, Charlotte, NC.
</li>
</ul>
</div>
</section>
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<h2>Research Projects</h2>
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<section>
<span class="icon solid major fa-space-shuttle"></span>
<h3>Comparing Unstable Cislunar Orbits for Efficient Transfers to Deep-Space Targets (2021-2024)</h3>
<p>
With increasing interest in cislunar operations and exploration of deep space destinations like Mars, a foundational understanding of cislunar dynamics and
their potential for facilitating departure from the vicinity of Earth is essential. This investigation addresses this need by analyzing system departure
characteristics from a variety of periodic orbit families with unstable members in the Earth-Moon Circular-Restricted 3-Body Problem (CR3BP). Specifically, a
cislunar-to-Mars transfer methodology is developed, leveraging multi-body dynamical systems theory, especially invariant manifolds of periodic orbits, to
design lower-energy deep space transfers in comparison to traditional methods. The proposed approach generates families of end-to-end transfers that vary in
total maneuver delta-v cost and time-of-flight, originating from different unstable cislunar orbits. The tradespaces of these transfer families are then
analyzed and compared across various departure orbits to identify departure characteristics across orbit families and energy levels (Jacobi constants). The
analysis reveals certain unstable Earth-Moon CR3BP orbit families with more favorable departure characteristics. Additionally, this investigation compares the
computed deep space transfer costs with those of traditional interplanetary transfers and others from existing literature. Although this transfer design
strategy is specifically applied to Mars transfers in this investigation, the methodology is broadly applicable to other deep space destinations. Furthermore,
the general findings on cislunar departure characteristics have implications for mission designs to destinations beyond the Earth-Moon region.
</p>
<ul class="actions">
<li><a href="https://engineering.purdue.edu/people/kathleen.howell.1/index.html" class="button">Learn more about MBD research</a></li>
</ul>
</section>
<section>
<span class="icon solid major fa-paper-plane"></span>
<h3>A Parametric Study of Hypersonic Waverider Flight Mechanics in Optimized Trajectories during Atmospheric Entry (2019-2021)</h3>
<p>
The purpose of this research project was to provide a brief analysis of unpowered skip and glide entry trajectories and to present an optimized hypersonic
waverider trajectory for a simple atmospheric reentry scenario. Five main types of unpowered glide trajectories—constant flight path angle, constant sinking
speed, constant flight speed, constant dynamic pressure, and constant heating rate—were analyzed using MATLAB to model the altitude, velocity, flight path
angle, and lift modulation profiles. Additionally, constant aerodynamic efficiency skip trajectories were analyzed for their ability to extend reentry ranges.
The results of these analyses were then used to optimize a combined skip-glide atmospheric reentry trajectory for hypersonic waveriders about the Earth’s
equator. This research utilized a classical optimization approach, using MATLAB to graph the applicable design spaces for the analysis. The resulting
trajectory maximizes the range of the reentry trajectory while conforming to applied maximum aerodynamic heating and maximum dynamic pressure constraints. The
findings of this research will benefit the aerospace community by providing insight into hypersonic waverider performance during Earth reentry after completed
space missions. This information can be used to inform flight vehicle design decisions for optimizing hypersonic waverider performance. Moreover, beyond just
Earth atmospheric reentry, the analyses used in this research can also be applied to atmospheric entry into other planetary atmospheres, aiding in vehicle
design and planning for interplanetary missions.
</p>
<ul class="actions">
<li><a href="https://kb.osu.edu/handle/1811/92422" class="button">Read more!</a></li>
</ul>
</section>
</div>
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<h2>Get in touch</h2>
<div class="innner">
<section>
<ul class="contact">
<li>
<h3>Email</h3>
<a href="#">richmo11@purdue.edu</a>
</li>
<li>
<h3>Social</h3>
<ul class="icons">
<li><a href="https://github.com/JonathanRichmond" class="icon brands fa-github"><span class="label">GitHub</span></a></li>
<li><a href="https://www.linkedin.com/in/jonathan-richmond/" class="icon brands fa-linkedin-in"><span class="label">LinkedIn</span></a></li>
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