Theodore Kareta, PhD

Assistant Professor of Astrophysics & Planetary Science Villanova University

  • Villanova PA

Professor Kareta, Ph.D., researches comets, asteroids and other small solar system bodies with telescopes, computer models and spacecraft.

Contact

Villanova University

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Media

Areas of Expertise

Comets
Asteroids
Centaurs
Planetary Defense
Meteor Showers‎
Meteorites
Trans-Neptunian Objects

Biography

Theodore "Teddy" Kareta, Ph.D., is an expert on the Solar System's "small bodies" -- its comets, asteroids, and trans-Neptunian objects. His research spans from the origin of meteor showers to the behaviors of far-away comets to the study of potentially hazardous asteroids nearby. His work utilizes large ground- and space-based telescopes to measure the light emitted and reflected by these bodies to understand what they are made of and how they have changed since the time of their formation billions of years into the past.

Prior to joining Villanova, Dr. Kareta worked as a postdoctoral research associate at Lowell Observatory in Flagstaff, Arizona where he played a key role in NASA's first planetary defense mission, the Double Asteroid Redirection Test or DART. He has also was a part of the science teams for the NASA OSIRIS-REx mission and the European Space Agency (ESA)'s mission Rosetta. Throughout both his telescopic and spacecraft-related work, Dr. Kareta has successfully involved many students meaningfully in his research.

Dr. Kareta's research has increasingly focused on the study of the Interstellar Objects, comets and asteroids which formed around other stars before being tossed out and subsequently found rapidly passing through our own Solar System. He lead some of the earliest publications detailing ground-based telescopic characterizations of both the second and third of the interstellar objects, 2I/Borisov and 3I/ATLAS, and has been funded by NASA to study near-Earth object analogues to the Interstellar Objects closer to home.

From 2021 to 2025, Dr. Kareta was also the press officer for the American Astronomical Society's Division for Planetary Sciences. He maintains both an interest in and a communication to thorough and effective communication of science to the public through all possible channels.

Education

University of Arizona

PhD

Planetary Science

UMass Amherst

BS

Physics and Astronomy

Affiliations

  • American Astronomical Society's Division for Planetary Science (DPS) : Junior/Member, 2018 - Present

Select Media Appearances

Astronomers discover previously unknown quasi-moon near Earth

CNN  online

2025-10-22

“Based on what little we know so far, it’s almost certainly a rocky and natural object — sometimes old satellites and rocket junk end up in these very-near-Earth kinds of orbits, but we can often tell ‘natural’ (e.g., asteroidal) from ‘artificial’ (e.g., satellite) based on how their orbits evolve on short timescales,” wrote Dr. Teddy Kareta, assistant professor in the department of astrophysics and planetary science at Villanova University, in an email.

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Comet Lemmon will appear in the Philly-area skies the next several evenings

The Philadelphia Inquirer  print

2025-10-18

Come Monday around sunset, Teddy Kareta plans to ascend to the roof of a building near Lancaster Avenue on the Main Line to catch sight of something in the evening sky that hasn’t been around for about 1,300 years.

To the surprise of astronomers, a “cosmic snowball” named Comet Lemmon has become so bright “that people don’t have to be in the most perfect dark location” to see it, said Kareta, assistant professor of astrophysics and planetary science at Villanova University.

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Astronomers spot an interstellar object zipping through our solar system

CNN  online

2025-07-03

The comet is moving at nearly 37 miles per second (60 kilometers per second) — or 133,200 miles per hour (about 214,364 kilometers per hour) — too fast to be a “local” object in our solar system, said Teddy Kareta, an assistant professor at Villanova University near Philadelphia.

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Research Grants

Shining a Light on the Dark Comets

Yearly Opportunities in Planetary Defense (YORPD), NASA

2025 - 2028

Select Academic Articles

Near-discovery Observations of Interstellar Comet 3I/ATLAS with the NASA Infrared Telescope Facility

The Astrophysical Journal Letters

2025

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On the Lunar Origin of Near-Earth Asteroid 2024 PT5

The Astrophysical Journal Letters

2025

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Telescope-to-Fireball Characterization of Earth Impactor 2022 WJ1

The Planetary Science Journal

2024

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