San Diego Astronomy Association (SDAA) sponsors speakers on a wide range of astronomy topics on the third Wednesday of every month at the Mission Trails Regional Park Visitors Center. The Program meeting begins at 7:00 PM. Each attendee receives one free door prize ticket. After announcements and a small amount of business, the audience is treated to the featured presentation. At the close of the meeting the door prizes are presented.  The event is open to the public. The Mission Trails Regional Park Visitors Center is at One Fr. Junipero Serra Trail, San Diego CA 92119.  Call the park at 619-668-3281 for more information or visit http://www.mtrp.org.

Please contact Dave Wood if you have an questions, comments, or ideas for the Program Meetings.

Meetings since July 2020 are being archived on the SDAA YouTube page.

November 18, 2020

Speaker: Ryan Rubenzahl – Caltech

Topic: Measuring the Speed of Stars More Precisely Than Your Car’s Speedometer

SDAA Speaker

The “doppler method” of detecting planets orbiting other stars requires precise measurements of the speeds of those distant stars. If we can see a star oscillating towards and away from us, we can infer that an unseen planet is tugging on its parent star as it orbits. This method successfully found the first exoplanet, 51 Peg b, a discovery which earned the Nobel Prize this last year. In this public talk we will learn just how hard it is to precisely measure the speeds of stars to the precision of 0.2 mph necessary for finding these Earth-like planets. Next-generation instruments capable of these discoveries may finally be able to answer the question of how common planets like Earth really are in the galaxy. YouTube: https://youtu.be/7A9c5IEzM0w .

You can register in advance for this meeting at the following link. After registering, you will receive a confirmation email containing information about joining the meeting. :

https://us02web.zoom.us/j/89298162225?pwd=TVZsTTg3dzRXcERDY0tXeHErVXArQT09



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Upcoming SDAA Program Meetings
January No general meeting - annual banquet
February 19 Dr. Steven Levin (NASA JPL) - NASA's Juno at Jupiter
March 18 Dr. Nicholas Galitzki ( UCSD) - Cosmic Microwave Background at the Simons Observatory - cancelled
April 15 Mr. Paul Ericson - International Dark-Sky Association
May 20 Dr. Quinn Konopacky (UCSD) - The Intricate Dance of Star and Planet Formation
June 17 Dr. Jim Fuller (CalTech) - The Sound of Stars
July 15 Blaine Baggett - Apollo at JPL
August 19 Dr. Nicholas Galitzki ( UCSD) - Cosmic Microwave Background at the Simons Observatory
September 16Steve Hallmann - "Discovering The Darkness ... Dark Matter & Dark Energy ... An Overly Simplified Tale of How We Came To Know That Most Of The Universe Is Dark"
October 21 Mia de los Reyes - The Loneliest Galaxies in the Universe
November 18 Ryan Rubenzahl - Measuring the Speed of Stars More Precisely Than Your Car’s Speedometer
December 16 Dr. Alex Ji - TheFirst Stars