People » Joshua Colwell

Dr. Colwell received his B.S. in Physics from Stetson University and a Ph.D. in Astrophysical, Planetary and Atmospheric Sciences from the University of Colorado at Boulder. He has been on the faculty at UCF since 2006.

I study the origin and evolution of the solar system and in particular small bodies such as planetary rings, asteroids, comets, dust, and small moons. I’m a Co-Investigator on the Ultraviolet Imaging Spectrograph (UVIS) on the Cassini spacecraft, leading observation design and data analysis and interpretation for observations of Saturn’s rings with that instrument. I am Director of the Center for Microgravity Research within the UCF Physics Department where we design, build and operate microgravity experiments to study the early stages of planet formation, the surfaces of small asteroids and moons, and the collisional evolution of planetary rings.

Pilorz, S., N. Altobelli, J. E. Colwell, and M. Showalter 2015. Thermal Transport in Saturn’s B Ring Inferred from Cassini CIRS. Icarus 254, 157-177, doi:10.1016/j.icarus.2015.01.002.

Nicholson, P. D., R. G. French, C. A. McGhee-French, K. Lonergan, T. Sepersky, M. M. Hedman, E. A. Marouf, and J. E. Colwell 2014. Noncircular Features in Saturn’s Rings II: The C Ring. Icarus 241, 373-396, doi:10.1016/j.icarus.2014.06.024.

Nicholson, P. D., R. G. French, M. M. Hedman, E. A. Marouf, and J. E. Colwell 2014. Noncircular Features in Saturn’s Rings I: The Edge of the B Ring. Icarus 227, 152-175, doi:10.1016/j.icarus.2013.09.002.

Cuzzi, J. N., A. D. Whizin, R. C. Hogan, A. R. Dobrovolskis, L. Dones, M. R. Showalter, J. E. Colwell, and J. D. Scargle 2013. Saturn’s F Ring Core: Calm in the Midst of Chaos. Icarus 232, 157-175, doi:10.1016/j.icarus.2013.12.027.

Baillié, K., J. E. Colwell, L. W. Esposito, and M. C. Lewis 2013. Meter-sized Moonlet Population in Saturn’s C Ring and Cassini Division. Astron J. 145, 171, doi:10.1088/0004-6256/145/6/171.

Bradley, E. T., J. E. Colwell, L. W. Esposito 2013. Scattering Properties of Saturn’s Rings in the Far Ultraviolet from Cassini UVIS Spectra. Icarus 225, 726-739 doi: 10.1016/j.icarus.2013.04.008.

Albers, N., Sremčević, M., Colwell, J. E., Esposito, L. W. 2012. Saturn’s F Ring as seen by Cassini UVIS: Kinematics and Statistics. Icarus 217, 367-388, doi:10.1016/j.icarus.2011.11.016.

Esposito, L. W., N. Albers, B. K. Meinke, M. Sremčević, P. Madhusudhanan, J. E. Colwell, R. G. Jerousek 2012. A Predator-Prey Model for Moon-triggered Clumping in Saturn’s Rings. Icarus 217, 103-114, doi:10.1016/j.icarus.2011.09.029.

Jerousek, R. G., J. E. Colwell, L. W. Esposito 2011. Morphology and Variability of the Titan Ringlet and Huygens Ringlet Edges. Icarus, 216, 280-291, doi:10.1016/j.icarus.2011.09.001.

Baillié, K., J. E. Colwell, L. W. Esposito, M. Sremčević 2011. Waves in Cassini UVIS Stellar Occultations 2. Waves in the C Ring. Icarus, 216, 292-308, doi:10.1016/j.icarus.2011.05.019.

Hansen, C., D. Shemansky, L. Esposito, I. Stewart, A. Hendrix, J. Colwell, R. West 2011. The Composition and Structure of Enceladus’ Plume. Geophys. Res. Lett. 38, L11202, doi:10.1029/2011GL047415.

Colwell, J. E., L. W. Esposito, D. Pettis, M. Sremčević, R. G. Jerousek, E. T. Bradley 2010. Cassini UVIS Stellar Occultation Observations of Saturn’s Rings. Astron. J. 140, 1569-1578, doi:10.1088/0004-6256/140/6/1569.

Cuzzi, J. N., J. A. Burns, S. Charnoz, R. N. Clark, J. E. Colwell, L. Dones, L. W. Esposito, G. Filacchione, R. G. French, M. M. Hedman, S. Kempf, E. A. Marouf, C. D. Murray, P. D. Nicholson, C. C. Porco, J. Schmidt, M. R. Showalter, L. J. Spilker, J. N. Spitale, R. Srama, M. Sremčević, M. S. Tiscareno, J. Weiss 2010. An Evolving View of Saturn’s Dynamic Rings. Science, 327, 1470-1475, doi:10.1126/science.1179118.

Bradley, E. T., J. E. Colwell, L. W. Esposito, J. N. Cuzzi, H. Tollerud, L. Bruesch-Chambers 2010. Far Ultraviolet Spectral Properties of Saturn’s Rings from Cassini UVIS. Icarus, 206, 458-466, doi:10.1016/j.icarus.2009.12.021.

Robbins, S. J., G. R. Stewart, M. C. Lewis, J. E. Colwell 2010. Estimating the Masses of Saturn’s A and B Rings from High-Optical Depth N-Body Simulations and Stellar Occultations. Icarus 206, 431-445, doi:10.1016/j.icarus.2009.09.012.

Colwell, J. E., L. W. Esposito, G. R. Stewart, and M. Sremčević 2009. Density Waves in Cassini UVIS Stellar Occultations 1. The Cassini Division. Icarus, 200, 574-580,  doi:10.1016/j.icarus.2008.12.031.

Hansen, C. J., Esposito, Stewart, A. I. F., L. W., Meinke, B., Wallis, B., Colwell, J. E., Hendrix, A. R., Larsen, K., Pryor, W., Tian, F. 2008. Water Vapor Jets inside the Plume of Gas Leaving Enceladus. Nature 456, 477-479, doi:10.1038/nature07542.

Colwell, J. E., S. R. Robertson, M. Horányi, X. Wang, A. Poppe, and P. Wheeler 2009. Lunar Dust Levitation. J. Aerospace Eng., 22, 2-9, doi:10.1061/(ASCE)0893-1321(2009)22:1(2).

Physics and Astronomy demonstration videos:

Phases and orbit of the Moon.

Lunar and Solar Eclipses.

With colleagues Addie Dove and Ashley Kehoe, I host a fun astronomy podcast called Walkabout the Galaxy. Subscribe to the podcast here.

I’m the Assistant Director of the Florida Space Institute, UCF’s space research and engineering institute that partners with universities across the state to enhance our space research programs in Florida.

Oversees the following Graduate Students

Knights in Space

In the latest issue of UCF’s magazine, Pegasus, there are many stories focusing on UCF’s involvement with space. Many of these stories feature researchers from the UCF Physics Department. In the pag... Read more

Space Dust Research Wins NASA Rides

By Scott Powers – Writer for Orlando Sentinel Tiny particles of space dust: How do they stick together? How might astronauts not stir them up? Two UCF scientists are asking, and they’ve gotten NASA’s... Read more

Click here to read additional news stories

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