NASA Jet Propulsion Laboratory California Institute of Technology JPL Home Earth Solar System Stars & Galaxies Science & Technology Bring the Universe to You JPL Email News RSS Podcast Video
Follow this link to skip to the main content

Home
Research
Opportunities
Community
News and Events
ST icon
Office of the Chief Scientist and Chief Technologist

Profiles

Steve  Chesley's Picture
Address:
Jet Propulsion Laboratory
M/S 301-121
4800 Oak Grove Dr.
Pasadena, CA 91109
Phone:
818.354.9615
Fax:
818.354.3822
Email:

Steve Chesley
Senior Research Scientist

Education
  • Ph.D., Aerospace Engineering, University of Texas, Austin (1998)
  • M.S., Aerospace Engineering, Texas A&M University (1993)
  • B.S., Aerospace Engineering, Texas A&M University (1986)

Research Interests
  • Precision orbit estimation and trajectory prediction for asteroids and comets
  • Yarkovsky effect on asteroids
  • Comet nongravitational acceleration modeling
  • Asteroid impact hazard assessment
  • Asteroid deflection strategy

Professional Experience
  • Jet Propulsion Laboratory (2000-Present)
    • Senior Research Scientist (2014-Present)
    • Principal Engineer (2008-Present)
    • Senior Engineer (2000-2008)
  • NSF-NATO Postdoctoral Research Fellow, Univ. Pisa, Italy (1998-1999)
  • Doctoral Candidate, University of Texas, Austin, Texas (1993-1998)
  • Masters Candidate, Texas A&M University, College Station, Texas (1991-1993)
  • Pilot, United States Air Force (1986-1991)

Selected Awards
  • NASA Exceptional Engineering Achievement Medal, 2011
  • JPL Mariner Award, 2010
  • NASA Space Act Board Award, 2005
  • Ed Stone Award for Outstanding Research Publication, 2004
  • Eight NASA Group Achievement Awards
  • Asteroid 12104 Chesley named in honor of scientific work

Selected Publications
  1. S.R. Chesley et al., “The Trajectory Dynamics of Near-Earth Asteroid 101955 (1999 RQ36),” Icarus, in press, 2014.
  2. D. Farnocchia, S.R. Chesley et al., “Yarkovsky-driven impact risk analysis for asteroid (99942) Apophis,” Icarus, in press, 2013.
  3. D. Farnocchia, S.R. Chesley et al., “Near-Earth Asteroids with measurable Yarkovsky effect,” Icarus, in press, 2013.
  4. S.R. Chesley, et al., “An updated rotation model for Comet 9P/Tempel 1,” Icarus 222 pp.516-525, 2013.
  5. J. Baer, S.R. Chesley and R.D. Matson “Astrometric Masses of 26 Asteroids and Observations on Asteroid Porosity” AJ 141 pp. 143-154, 2011.
  6. J. Baer, S.R. Chesley and A. Milani “Development of an Observational Error Model” Icarus 212 pp. 438-447, 2011.
  7. S.R. Chesley, J. Baer and D.G. Monet “Treatment of star catalog biases in asteroid astrometric observations” Icarus 210(1), pp. 158-181, 2010.
  8. A. Milani, S.R. Chesley et al. “Long term impact risk for (101955) 1999 RQ36” Icarus 203(2) pp. 460-471, 2009.
  9. S. Chesley “The Quest to Find the Next Killer Asteroid – Before it Finds Us” The Planetary Report 29(2) March 2009.
  10. P. Jenniskens et al. “The impact and recovery of 2008 TC3” Nature 458, pp. 485- 488, 2009.
  11. D. Vokrouhlicky, S.R. Chesley and R.D. Matson “Orbital Identification for Asteroid 152563 (1992 BF) Through the Yarkovsky Effect” AJ 135, pp. 2336-2340, 2008.
  12. J. Baer, S.R. Chesley "Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris" Celestial Mechanics and Dynamical Astronomy 100(1), pp. 27- 42, 2008.
  13. S.R. Chesley and S.N. Ward, "A Quantitative Assessment of the Human and Economic Hazard from Impact-generated Tsunami" Journal of Natural Hazards 38(3), pp. 355-374, 2006.
  14. S.R. Chesley, "Potential Impact Detection for Near-Earth Asteroids: The Case of 99942 Apophis (2004 MN4)", in Asteroids Comets, Meteors, Proceedings of IAU Symposium # 229 (D. Lazzaro, S. Ferraz-Mello and J.A. Fernandez, Eds.) pp. 215- 228, Cambridge Univ. Press, 2006.
  15. A. Milani, S.R. Chesley et al., "Nonlinear Impact Monitoring: Line Of Variations Searches for Impactors" Icarus 173(1), 362-384, 2005.
  16. S.R. Chesley and D.K. Yeomans, "Nongravitational Accelerations on Comets" in Dynamics of Populations of Planetary Systems, Proceedings of IAU Colloquium #197, held 31 August - 4 September, 2004 in Belgrade, Serbia and Montenegro. Edited by Z. Knezevic and A. Milani. Cambridge: Cambridge University Press, p.289-302, 2005.
  17. S.R. Chesley, "Very short arc orbit determination: the case of asteroid 2004 FU162" in Dynamics of Populations of Planetary Systems, Proceedings of IAU Colloquium #197, held 31 August - 4 September, 2004 in Belgrade, Serbia and Montenegro. Edited by Z. Knezevic and A. Milani. Cambridge: Cambridge University Press, p.255-258, 2005.
  18. S.R. Chesley and T.B. Spahr, "Earth impactors: Orbital characteristics and warning times," in Mitigation of Hazardous Comets and Asteroids, Eds. M.J.S. Belton et al., Cambridge University Press, pp. 22-37, 2004.
  19. S.R. Chesley et al. "Direct Detection of the Yarkovsky Effect by Radar Ranging to Asteroid 6489 Golevka" Science 302, 1739-1742, 2003.
  20. A. Milani, S.R. Chesley, P.W. Chodas and G.B. Valsecchi, "Asteroid Close Approaches: Analysis and Potential Impact Detection" in Asteroids III, Space Science Series, Univ. Arizona Press, pp. 55-69, 2002.
  21. S.R. Chesley et al., "Quantifying the risk posed by potential Earth impacts" Icarus 159(2), 423-432, 2002.
  22. D. Vokrouhlicky, S.R. Chesley and A. Milani, "On the observability of radiation forces acting on near-Earth asteroids" Celest. Mech. Dynam. Astron. 81, 149-165, 2001.
  23. D. Vokrouhlicky, A. Milani and S. R. Chesley, "Yarkovsky effect on small near-Earth asteroids: Mathematical formulation and examples." Icarus 148(1), 118-138, 2000.
  24. A. Milani, S.R. Chesley, and G.B. Valsecchi, "Asteroid Close Encounters with Earth: Risk Assessment." Planet. Space Sci. 48(10) 945-954, 2000.
  25. A. Milani, S.R. Chesley, A. Boattini and G.B. Valsecchi, "Virtual Impactors: Search and Destroy." Icarus 145(1), 12-24, 2000.
  26. A. Milani, S.R. Chesley, and G.B. Valsecchi, "Close approaches of asteroid 1999 AN10: Resonant and non-resonant returns." Astronomy & Astrophysics 346, L65- L68, 1999.
  27. S. Chesley and K. Zare, "Bifurcations in the mass ratio of the planar isosceles three-body problem." in Dynamics of Small Bodies in the Solar System (A. E. Roy and B. A. Steves, Eds.) 413-424, Kluwer, 1999.
  28. S. Chesley, "A global analysis of the generalized Sitnikov problem." Celest. Mech. Dynam. Astron. 73, 291-302, 1999.
  29. K. Zare and S. Chesley, "Order and chaos in the planar isosceles three-body problem." CHAOS 8(2), 475-494, 1998.

Site Manager:  Brian Knosp
Webmasters:  Cornell Lewis, Maryia Davis

JPL Clearance:  CL#08-4147