Evidence for multi-fragmentation and mass shedding of boulders on rubble-pile binary asteroid system (65803) Didymos.

Asteroids smaller than 10 km are thought to be rubble piles formed from the reaccumulation of fragments produced in the catastrophic disruption of parent bodies. Ground-based observations reveal that some of these asteroids are today binary systems, in which a smaller secondary orbits a larger primary asteroid. However, how these asteroids became binary systems remains unclear.

Recent collisional history of (65803) Didymos.

The Double Asteroid Redirection Test (DART, NASA) spacecraft revealed that the primary of the (65803) Didymos near-Earth asteroid (NEA) binary system is not exactly the expected spinning top shape observed for other km-size asteroids. Ground based radar observations predicted that such shape was compatible with the uncertainty along the direction of the asteroid spin axis. Indeed, Didymos shows crater and landslide features, and evidence for boulder motion at low equatorial latitudes.

Tracheal Bronchus and Successful Right-Sided Isolation With a Bronchial Blocker.

The presence of a tracheal bronchus, which is often incidentally discovered, complicates endotracheal intubation and lung isolation during thoracic surgery. Prior reports of successful right-sided lung isolation in the presence of tracheal bronchus required utilization of a double lumen tube. Although right-sided lung isolation was required in our case, due to other patient factors, it was determined that a double lumen tube of a suitable size would be unlikely to be placed safely and successfully.

Orbital stability analysis and photometric characterization of the second Earth Trojan asteroid 2020 XL.

Trojan asteroids are small bodies orbiting around the L or L Lagrangian points of a Sun-planet system. Due to their peculiar orbits, they provide key constraints to the Solar System evolution models. Despite numerous dedicated observational efforts in the last decade, asteroid 2010 TK has been the only known Earth Trojan thus far.