Sarah Greenstreet
Senior Researcher
B612 Asteroid Institute
Visiting Scientist
University of Washington
Physics-Astronomy Bldg.
3910 15th Ave NE,
Room B311
Seattle, WA 98195

Current Position

Senior Researcher with B612 Foundation's Asteroid Insititue, January 2018-present
Visiting Scientist at the University of Washington's DIRAC Center, January 2018-present
Focus: Orbital dynamics problems related to NEO impact threats, NEO impact hazard mitigation, orbital dynamics of NEOs and KBOs, impact and crater formation, observations of asteroids

Previous Position

Postdoctoral Fellow at Las Cumbres Observatory (LCO) / Postdoctoral Scholar at University of California Santa Barbara (UCSB), September 2015-November 2017
Focus: NEO candidate follow-up observations, NEO follow-up/characterization with citizen science


Ph.D., Astronomy, University of British Columbia, 2011-2015
Concentrations: Planetary Science, Orbital Dynamics
Thesis: Small body orbital dynamics in the Solar System: Celestial mechanics and impacts

M.S., Astronomy, University of British Columbia, 2009-2011
Concentrations: Planetary Science, Orbital Dynamics
Thesis: The orbital distribution of near-Earth objects inside Earth's orbit

B.S., Physics, Western Washington University, 2003-2007
Minors: Astronomy and Mathematics
Honors Research Project: Exploring the parameters of the linear cosmic microwave background (CMB) anisotropy spectrum with the on-line tool CMBFAST


See publications page.

Invited Talks

“Retrograde Asteroids: Going the wrong way around the Sun”, Portland State University, 2019.

“Near-Earth Asteroids on Retrograde Orbits”, NWxSW Astronomy Meeting, UBC, Vancouver, Canada, 2018.

"Asteroids, Telescopes, and Craters on Pluto", Woodland High School, Woodland, WA, 2018.

"The Outer Solar System: Pluto and Friends", Cosmopolitan Club, Santa Barbara, CA, 2017.

“We Are the First Generation to Explore the Solar System”, Astronomy on Tap Santa Barbara, M8RX bar, 2017. YouTube video of talk:, KCLU (NPR for California Cost) interview for talk:

“The Outer Solar System: Pluto and Friends”, Astronomy on Tap Santa Barbara, M8RX bar, 2016.
YouTube video of talk:

“The Solar System's Spare Parts: Observing Asteroids & Comets” and “The Solar System's Spare Parts: Space Rocks”, Camp Cosmos, Las Cumbres Observatory, 2016.

“Pluto, the Kuiper Belt, and a Possible (new) 9th Planet”, Santa Barbara Astronomical Unit amateur astronomer monthly meeting, 2016.

“Small body population celestial mechanics, impacts, and observations”, Seminar Talk, California Institute of Technology, 2016.

“Small body population celestial mechanics, impacts, and observations”, Colloquium, Jet Propulsion Laboratory, 2015.

“From NEOs to Craters on Pluto: A Look at Small Body Populations in the Solar System”, Seminar Talk, Southwest Research Institute, 2015.

“My Journey Toward Becoming an Astrophysicist”, AAUW-Bellingham High School Scholars Recognition Event, SPARK Museum of Electrical Invention, 2014.

“Asteroids, Dinosaurs, and Telescopes...Oh My!”, Career Symposium, Henrietta Lacks Health and Bioscience High School, 2014.

“Impact Hazard of Near-Earth Asteroids”, Time and Life in the Universe – A Roundtable Initiative, Peter Wall Institute for Advanced Studies, University of British Columbia, 2013.

“Near-Earth Asteroid Population Model: Surprises in the Inner Solar System”, Colloquium, Western Washington University, 2012.

Teaching Experience

Teaching Assistant, 2009-2010
University of British Columbia
Astronomy 101 - Introduction to the Solar System, Fall 2009
Astronomy 102 – Introduction to Stars and Galaxies, Winter 2010
Responsibilities for each course: taught a total of 48 hours for each lab section, graded lab assignments for 25-30 students for a total of ~20 hours, graded course assignments and exams for roughly 125 students for a total of ~10 hours, and invigilated the final exam.

Teaching Assistant, 2004-2007
Western Washington University
Physics 133 – Electricity & Magnetism, Fall 2004
Physics 115 – Principles of Physics I, Winter 2005
Physics 116 – Principles of Physics II, Spring 2005
Physics 233 – Waves and Optics, Fall 2005
Physics 101 – Principles of Light, Fall 2005 - Spring 2007
Responsibilities: Taught lab sections for each course (Course: Total number of labs/hours): 101: 13/468, 115: 2/72, 116: 2/72, 133: 2/72, 233: 1/36 as well as graded lab assignments for 25-35 students in each lab for a total of roughly 400 hours (~2 hours each week per lab).


Referee for Planetary and Space Science, MNRAS, New Astronomy
Executive secretary, external reviewer, and panel reviewer for NASA proposal review panels
Astronomy public talks series organizer, Las Cumbres Observatory (May 2016 – November 2017)
Seminar Chair/Organizer, Las Cumbres Observatory Global Telescope (Jan. 2016 – November 2017)
Organizer for Planetary Journal Club, University of British Columbia (Fall 2012 – Summer 2015)

Telescope Experience

Postdoctoral Fellow at LCO performing follow-up photometric and astrometric observations of near-Earth object candidates, NASA ARM targets, NHATS targets, radar targets, and Yarkovsky candidates using LCO's global network of 1.0-m and 2.0-m optical telescopes (September 2015 – November 2017)

Co-Investigator with the Near-Earth Space Surveillance (NESS) project science team for Canada's microsatellite NEOSSat (Near-Earth Object Surveillance Satellite), (2013 – 2015)

Completed independent studies course taken on operating the University of British Columbia Southern Observatory remote telescope on Cerro Tololo, Chile during which performed photometric and astrometric observations of main-belt asteroids (2012)

Palomar Mountain Observing Run #2503, 2010 Mar 18 – 2010 Mar 20, Telescope: P200, P.I.: Bob Jacobson, Lead Observer: Brett Gladman, Primary Instrument: LFC, Observing target: Saturnian irregular satellite discovery and tracking

Technical Skills

Programming abilities in C, Fortran, Python, and Django, including test-driven development

Experience with Jupyter notebooks and the Google Compute Engine interface

Numerical integration experience with SWIFT-RMVS4

Writing, modifying, & running survey simulations (in Fortran) to create an optimal pointing strategy for Canada's microsatellite NEOSSat (Near-Earth Object Surveillance Satellite)

Writing a simulator (in Python) for NEO candidate follow-up with LCO's 1.0-m and 2.0-m telescope network that employs a newly-developed Figure of Merit function for strategy optimization

Experience using a Beowulf cluster

IRAF, Astrometrica, and Find_Orb photometry and astrometry

Experience with GitHub version control system

Experience with OpenOrb asteroid orbit computation software

Membership in Scholarly Societies & Mission Science Teams

Member of the Outer Solar System Origins Survey (OSSOS) science team (2016 – present)

Collaborator with the New Horizons science team (2015 – present)

Co-Investigator with the Near-Earth Space Surveillance (NESS) project science team for Canada's microsatellite NEOSSat (Near-Earth Object Surveillance Satellite) (2013 – 2015)

American Astronomical Society (2010 – present)

Division of Planetary Sciences Junior Member, American Astronomical Society (2010 – 2015)

Division of Planetary Sciences Full Member, American Astronomical Society (2016 – present)

Click here to download a pdf of my CV.