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- The Arecibo Observatory at the Upcoming 240th American Astronomical Society Meeting06 Apr, 2022
- The Arecibo Observatory Survey Salvage Committee Report06 Apr, 2022
- Facilities and Operations Update06 Apr, 2022
- PRISMA Meteor Radar Arrives at AO04 Apr, 2022
- The Grand Reopening of the Angel Ramos Science and Visitor Center at the Arecibo Observatory01 Apr, 2022
- Orbital stability analysis and photometric characterization of the second Earth Trojan asteroid 2020 XL531 Mar, 2022
- Arecibo Celebrates International Women’s Day31 Mar, 2022
- A Letter from the Director Eng. Francisco Cordova31 Mar, 2022
- The History of Arecibo’s Legacy Telescope to Impact the Future, Thanks to the AO Salvage Survey Committee31 Mar, 2022
- Announcing AO/GBT Single Dish Summer School May 16th - 20th, 2022 30 Mar, 2022
- NSF REU program at Arecibo receives funding for next 3 years23 Mar, 2022
- A Parkes "Murriyang" Search for Pulsars and Transients in the Large Magellanic Cloud23 Mar, 2022
- Noise analysis in the European Pulsar Timing Array data release 2 and its implications on the gravitational-wave background search23 Mar, 2022
- Arecibo S-band Radar Characterization of Local-scale Heterogeneities within Mercury's North Polar Deposits23 Mar, 2022
- Arecibo’s Eye on the Sun21 Mar, 2022
Asteroid Visiting Earth’s Neighborhood Brings its Own Face Mask
Byadmin23 April 2020 Planetary

Anne Virkki, Head of Planetary Radar at the Arecibo Observatory and asteroid 1998 OR2 pose with their masks.
The Arecibo Observatory in Puerto Rico is following an asteroid approaching Earth this week and while it poses no threat, it appears to know our planet is facing a pandemic. “The small-scale topographic features such as hills and ridges on one end of asteroid 1998 OR2 are fascinating scientifically,” says Anne Virkki, head of Planetary Radar at the observatory. “But since we are all thinking about COVID-19 these features make it look like 1998 OR2 remembered to wear a mask.”
The National Science Foundation facility, which is managed by the University of Central Florida, has a team of experts who monitors near-Earth asteroids. This asteroid is in a special class of near-Earth asteroids called Potentially Hazardous Objects (PHOs).
“The small-scale topographic features such as hills and ridges on one end of asteroid 1998 OR2 are fascinating scientifically... But since we are all thinking about COVID-19 these features make it look like 1998 OR2 remembered to wear a mask.” - Dr. Anne Virkki Head of Planetary Sciences Department
PHOs are bigger than 140 meters (about 500 feet) and come within 5 million miles of Earth’s orbit. No known PHO poses an immediate danger to the Earth, but observations like those conducted at the Arecibo Observatory are used to determine their future trajectories.

Follow the white line to track the masked asteroid through Earth’s neighborhood. Credit: NASA/JPL Horizons
“The radar measurements allow us to know more precisely where the asteroid will be in the future, including its future close approaches to Earth,” says Flaviane Venditti, a research scientist at the observatory. “In 2079, asteroid 1998 OR2 will pass Earth about 3.5 times closer than it will this year, so it is important to know its orbit precisely.”
“Although this asteroid is not projected to impact Earth, it is important to understand the characteristics of these types of objects to improve impact-risk mitigation technologies.” — Anne Virkki
“Although this asteroid is not projected to impact Earth, it is important to understand the characteristics of these types of objects to improve impact-risk mitigation technologies,” Virkki says.
The Arecibo data confirmed that 1998 OR2 is approximately 2 kilometers (1.2 miles) across in size and rotates once every 4.1 hours, as was suggested by observations made with optical telescopes. Should an asteroid be discovered that posed an impact threat to Earth, knowing such characteristics would be important for planning a response. The team began observations on April 13 and will continue to collect data through April 23 when the asteroid will no longer be visible from the facility. The asteroid will make its closest approach to Earth on April 29 when it will still be 16 times farther than the distance to the Moon.

A team at the Arecibo Observatory in Puerto Rico took this range-Doppler radar image of Asteroid 1998OR2 on April 17.
Although the pandemic has impacted operations around the world, Arecibo continues its important contributions to science and to planetary defense. Radio astronomy observations can largely be made remotely, with only limited on-site observing. However, planetary radar operations cannot be run fully remotely, requiring at least one radar operator and one scientist on site. The team of scientists and telescope operators on site have been adhering to health and safety guidelines, limiting the number of observing scientists at the telescope and wearing masks during the observations. Other members of the team observing this asteroid are: Patrick Taylor (remotely) from Lunar and Planetary Institute in Houston, TX, Sean Marshall for UCF and Arecibo and telescope operations Israel Cabrera, Elliot Gonzalez and Daniel Padilla.
UCF manages the NSF facility under a cooperative agreement with Universidad Ana G. Méndez and Yang Enterprises, Inc. The Arecibo Planetary Radar Program is fully supported by NASA’s Near-Earth Object Observations Program in NASA’s Planetary Defense Coordination Office through grant no. 80NSSC19K0523 awarded to UCF. Arecibo has played a role in analyzing NEOs since the mid-90s, observing 60-120 objects per year. Congress made NEOs a priority when it directed NASA in 2005 to discover and characterize at least 90 percent of near-Earth objects larger than 140 meters by 2020.
About Arecibo
The Arecibo Planetary Radar Program is funded by NASA’s Near-Earth Object Observations Program. The Arecibo Observatory is operated by the University of Central Florida (UCF) in partnership with Universidad Ana G. Mendez - Universidad Metropolitana and Yang Enterprises Inc., under a cooperative agreement with the National Science Foundation (NSF).
Article written by Dr. Tracy Becker - AO Collaborator / SwRI |
Group Lead for Arecibo Planetary Radar |
For more information about NASA Planetary Defense program please check out the following links:
Keywords: arecibo, observatory, virkki, marshall, venditti, NASA, radio , lunar, telescope, radio, telescope, mask, Research, NEO,1998, OR