Podcaster: Dr. Al Grauer
Title: Travelers in the Night Digest: The Blinky!
Organization: Travelers in The Night
Link : Travelers in the Night
Description: Today’s 2 topics:
- misterious object.
Bio: Dr. Al Grauer is currently an observing member of the Catalina Sky Survey Team at the University of Arizona. This group has discovered nearly half of the Earth approaching objects known to exist. He received a PhD in Physics in 1971 and has been an observational Astronomer for 43 years. He retired as a University Professor after 39 years of interacting with students. He has conducted research projects using telescopes in Arizona, Chile, Australia, Hawaii, Louisiana, and Georgia with funding from NSF and NASA.
He is noted as Co-discoverer of comet P/2010 TO20 Linear-Grauer, Discoverer of comet C/2009 U5 Grauer and has asteroid 18871 Grauer named for him.
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Transcript:
215-Blinky
216-Blinky revealed
The Magdalena Ridge Observatory in New Mexico is home to the largest telescope in the world which is routinely used for Earth approaching asteroid research. The telescope’s primary mirror is almost 8 feet in diameter and is housed in a mount which allows it to move around the sky at an amazing 10 degrees per second. Dr. Eileen Ryan is the observatory’s director and her husband Dr. Bill Ryan uses this large telescope to study solar system objects.
On his discovery images, my Catalina Sky Survey team leader Eric Christensen was amazed to see rapid brightness changes in the Earth approaching asteroid he had just discovered. He immediately suspected it to be an irregularly shaped rapidly spinning object and contacted the Ryans for followup observations. I continued to track this object on my observing shift on the telescope and gave it the nickname “Blinky”. Dr. Bill Ryan’s first observations of 2015 YJ aka Blinky encouraged him to continue to measure its brightness changes as it streaked through the night sky. In Dr. Bill Ryan’s experiences a typical small Earth approaching object spins at a rate of once every two hours or so. When 2015 YJ tripled in brightness every 9 minutes he knew that Blinky is unusual and is spinning too fast for its tiny gravity to hold it together unless it is a solid object.
Blinky is likely to be a collision fragment perhaps one and a half times longer that it is wide and is spinning on its axis once every 9 minutes. What violent event which created Blinky remains a mystery.
End of podcast:
365 Days of Astronomy
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