Geometry and Topology

In collaboration with NASA, we mounted an observation campaign for the OSIRIS-REx spacecraft Earth Gravity Assist manoeuvre over Australia on the night of Sept 22 (and into the wee hours of Sept 23).

Our team were stationed across Australia and New Zealand in strategic locations to optimise viewing angles of OSIRIS-REx, creating a 3D triangulated track above Australia, and demonstrating the capabilities of the Desert Fireball Network system.

The result? Our cameras imaged the 2.5m spacecraft from a distance of 60,000km!

Why IS the DESERT FIREBALL NETWORK INVOLVED and where will the they be?

The Desert Fireball Network has three separate goals for tracking the spacecraft: providing a baseline so NASA can compare its telemetry from the spacecraft with the team’s ground observations, testing the team’s equipment and orbital analysis calculations, and engaging Australian astronomers and the broader community.


The DFN and our partners in this OREx Observation adventure are spread right across Australia. This map is just an approximate of where we may be heading – who knows where the best viewing conditions will be on the night!


If you are keen to take part, head out of town to make the most of dark skies and a clear night. Visit and enter your location to find out when and where to point your lens to capture the spacecraft flyby!

What is the NASA OSIRIS-REx Mission?


OSIRIS-REx seeks answers to the questions that are central to the human experience: Where did we come from? What is our destiny? Asteroids, the leftover debris from the solar system formation process, can answer these questions and teach us about the history of the sun and planets.


The OSIRIS-REx spacecraft is traveling to Bennu, a carbonaceous asteroid whose regolith may record the earliest history of our solar system. Bennu may contain the molecular precursors to the origin of life and the Earth’s oceans. Bennu is also one of the most potentially hazardous asteroids, as it has a relatively high probability of impacting the Earth late in the 22nd century. OSIRIS-REx will determine Bennu’s physical and chemical properties, which will be critical to know in the event of an impact mitigation mission.

Finally, asteroids like Bennu contain natural resources such as water, organics, and precious metals. In the future, these asteroids may one day fuel the exploration of the solar system by robotic and manned spacecraft.

Is there a Press Pack I can access?

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[action full_width=”yes” content_in_grid=”yes” type=”normal” text_font_weight=”” show_button=”yes” button_text=”Download” button_link=””]NASA OSIRIS-REx press kit[/action]
[action full_width=”yes” content_in_grid=”yes” type=”normal” text_font_weight=”” show_button=”yes” button_text=”Download” button_link=””]NASA OSIRIS-REx fact sheet[/action]

Ground-based Telescopes to Photograph NASA’s OSIRIS-REx During Earth Flyby

On Sept. 22, NASA’s OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security – Regolith Explorer) spacecraft will make a close approach to Earth, using the planet’s gravity to slingshot itself toward the asteroid Bennu. Over the course of several days, observatories and amateur astronomers with specialized equipment will be able to see OSIRIS-REx as the spacecraft approaches and retreats from its closest position over Earth, approximately 11,000 miles (17,000 km) above the planet’s surface.


The mission will collect images of OSIRIS-REx taken by observatories and other ground-based telescopes around the world during this period – approximately Sept. 10-23, depending on location and local conditions. Observers from the OSIRIS-REx Target Asteroids! citizen science program, who regularly volunteer their time to help scientists study near-Earth asteroids, will be among those who train their telescopes on the spacecraft’s path.


“The opportunity to capture images of the OSIRIS-REx spacecraft as it approaches Earth provides a unique challenge for observers to hone their skills during this historic flyby,” said Dante Lauretta, OSIRIS-REx principal investigator at the University of Arizona, Tucson. “As the spacecraft approaches Earth for its own imaging campaign, ground-based observers will also be looking up and taking photos from the opposite perspective.”


Individuals and groups may submit images of the spacecraft via the mission’s website, where instructions to locate the spacecraft in the sky are also available.

“The team is eager and ready to execute the Earth Gravity Assist,” said Rich Burns, OSIRIS-REx project manager at NASA’s Goddard Space Flight Center in Greeenbelt, Maryland. “Not only will it be a significant change in trajectory putting OSIRIS-REx on track for rendezvous with Bennu, it also represents a unique opportunity for the OSIRIS-REx instruments to observe our home planet. It is fantastic that ground based observers are also taking the opportunity to image OSIRIS-REx.”


The images collected during the Earth gravity assist represent the last opportunity for Earth-based observers to see the spacecraft — until it returns to Earth in 2023 carrying a sample from asteroid Bennu.

The Japan Aerospace Exploration Agency (JAXA), the home institution of several OSIRIS-REx science team members, will also work with the Japan Public Observatory Society and the Planetary Society of Japan to collect imagery from vantage points in Japan.


Shortly before OSIRIS-REx reaches its closest distance from Earth, the spacecraft will fly over the eastern half of Australia, giving observers there some of the best opportunities to see and photograph the spacecraft. The Desert Fireball Network — an organization based at Curtin University, Perth, that studies meteorites, fireballs and their pre-Earth orbits—will deploy observers to locations around Australia to track OSIRIS-REx across the sky.



NASA’s Goddard Space Flight Center provides overall mission management, systems engineering and the safety and mission assurance for OSIRIS-REx. Dante Lauretta of the University of Arizona, Tucson, is the principal investigator, and the University of Arizona also leads the science team and the mission’s observation planning and processing. Lockheed Martin Space Systems in Denver built the spacecraft and is providing flight operations. Goddard and KinetX Aerospace are responsible for navigating the OSIRIS-REx spacecraft. OSIRIS-REx is the third mission in NASA’s New Frontiers Program. NASA’s Marshall Space Flight Center in Huntsville, Alabama, manages the agency’s New Frontiers Program for its Science Mission Directorate in Washington.


For more information on OSIRIS-REx, visit:  and

Banner Image: This artist’s concept shows the OSIRIS-REx spacecraft passing by Earth.
Credits: NASA’s Goddard Space Flight Center/University of Arizona

Is there social media as well?

Members of the public without telescopes can still celebrate the Earth Gravity Assist by joining NASA’s “Wave to OSIRIS-REx” social media campaign. Individuals and groups from anywhere in the world are encouraged to take photos of themselves waving to OSIRIS-REx, share them using the hashtag #HelloOSIRISRExand tag the mission account in their posts on Twitter (@OSIRISREx) or Instagram (@OSIRIS_REx).

Participants may begin taking and sharing photos at any time — or wait until the OSIRIS-REx spacecraft makes its closest approach to Earth at 12:52 p.m. EDT on Friday, Sept. 22.


Or, if you’re keen like the DFN, you can download the Bennu 3D model and 3D print your own asteroid to sample with #MyOSIRISREx!


Got a telescope or high-end camera with a serious lens?

Keen to catch a glimpse of this rare spacecraft slingshot?

Available to head out to dark skies on the night of Sept 22 (and into the wee hours of Sept 23)?


Then you can track OSIRIS-REx too, alongside the Desert Fireball Network across Australia.

Any data and images you contribute will be acknowledged in this scientific endeavour of triangulating spacecraft with the DFN and NASA.


The apparent pathway of the OSIRIS-REx spacecraft over Australian skies will take an hour, beginning over Rockhampton at 00.22am (AEST) and exit over Adelaide at 00.53am local time on September 23.


The lateral motion of the spacecraft is expected to be small during Earth approach. Use the same exposure times that would be appropriate for a slow-moving asteroid. For some setups, this means 30 seconds or less. Start with “long” exposures and shorten if needed to reduce any smearing from the spacecraft motion and Earth’s rotation. Or, just take one very long exposure of the sky to capture OSIRIS-REx among star trails. The spacecraft will be moving much faster in the hours leading up to EGA so shorter exposures may be required.


Thanks to Chris Peat from, you can find out when OSIRIS-REx will be in your local sky and where to point your lens.

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ARE Australian Observatories involved?

Mount Burnett Observatory

Perth Observatory

Gravity Discovery Centre

Heights Observatory

Are there other Citizen Science projects?

Join a citizen science project that contributes to our understanding of near-Earth asteroids.