- Arecibo Observatory update after recent earthquakes09 Jan, 2020
- The Arecibo Observatory Congratulates Dr. Martha P. Haynes, Recipient of 2019 Bruce Gold Medal11 Dec, 2019
- Colloquium Series Recap11 Dec, 2019
- In Memoriam: Yervant Terzian, 1939 - 201906 Dec, 2019
- AO Observations of a Binary Pulsar Test the Theory of General Relativity in New Science Publication06 Dec, 2019
- The International Pulsar Timing Array: Second data release06 Dec, 2019
- Modeling Radar Albedos of Laboratory-Characterized Particles: Application to the Lunar Surface06 Dec, 2019
- Culebra Aerosol Research Lidar (CARLA) Project Selected for Funding04 Dec, 2019
- Arecibo Observatory to Offer New Opportunities for Visiting Scientists14 Nov, 2019
- Arecibo Observatory Open House at the 235th AAS meeting28 Oct, 2019
- UCF to Enhance Arecibo Observatory’s Computing Power Using Microsoft Azure17 Oct, 2019
- Arecibo Observatory Gets $19 Million NASA Grant to Help Protect Earth from Asteroids29 Sep, 2019
- National Science Foundation Awards Arecibo Observatory $12.3 Million Grant29 Sep, 2019
- El Observatorio de Arecibo celebra el regreso a clases con nuevas exhibiciones 30 Aug, 2019
- Asteroid Arrives Early for Puerto Rico’s Asteroid Day Celebrations28 Jun, 2019
- Our Telescope Operations Manager was recently awarded with the Yasme Excellence Award.19 Jun, 2019
Discovery Announcement of Binary System (163693) Atira
Byadmin20 January 2017 Planetary
E. G. Rivera-Valentin, P. A. Taylor, A. Virkki, and B. Aponte-Hernandez report that Arecibo (2380 MHz, 12.6 cm) delay-Doppler radar images obtained on 2017 January 20 and 23 reveal near-Earth asteroid (163693) Atira is a binary system. Visible range extents of the components in images with 150 m/pixel resolution suggest a primary up to 4.8 ± 0.5 km in diameter and a secondary 1.0 ± 0.3 km in diameter. The primary is possibly elongated and very angular in shape. On 2017 January 20, the system was observed near maximum separation in delay (range) suggesting a mutual-orbit scale of at least 5.7 km. On 2017 January 23, the system was observed near maximum separation in Doppler frequency suggesting an orbital period of roughly 16 hrs. A preliminary circular orbit fit finds a (projected) semimajor axis of 6 km and a period of 15.5 hrs.
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