- Asteroid Visiting Earth’s Neighborhood Brings its Own Face Mask 23 Apr, 2020
- REU Students’ Research & Presentations01 Apr, 2020
- Transforming the Arecibo Observatory into a Classroom31 Mar, 2020
- Arecibo Observatory re-enters VLBI network with 21st-century backend31 Mar, 2020
- JWST Workshop 31 Mar, 2020
- Management Update (COVID-19, Eartquakes, Transmitters)27 Mar, 2020
- NANOGrav Meeting Hosted at UCF27 Mar, 2020
- AO Colloquium: Dr. Michael Denton 27 Mar, 2020
- AO Colloquium: Dr. Alain Herique27 Mar, 2020
- REU Student Mishaal Jan Publishes Summer Research Study about Massive Star Forming Region26 Mar, 2020
- AO helps detect Magnetar in the Cow26 Mar, 2020
- Pulsar Astronomy and Physics at the Arecibo Observatory with Dr. Joanna Rankin26 Mar, 2020
- AO Science at AAS, AOGS26 Mar, 2020
- GBO/AO Single Dish and Observer Training Workshops (May 11-20, 2020)05 Feb, 2020
- Arecibo Observatory update after recent earthquakes09 Jan, 2020
- The Arecibo Observatory Congratulates Dr. Martha P. Haynes, Recipient of 2019 Bruce Gold Medal11 Dec, 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.
 |
 |