Our New Dates

September 19th – September 22nd 2019


! Astronomers !


Whether you are a beginner or an advanced amateur astronomer, we welcome you to attend the RTMC Astronomy Expo just outside of Big Bear City
  • See the stars from the clear air of YMCA Camp Oakes
  • Learn of new developments in amateur telescope making
  • Check out commercial telescopes and equipment brought by vendors for observers
  • Listen to excellent presentations covering observing, telescopes, and getting started in astronomy
  • Enjoy all the swap meet’s astro-goodies on both Saturday and Sunday
  • Socialize and observe with friends

Our 2018 Saturday Night Keynote Speaker was David Levy

David H. Levy is an astronomer, science writer and discoverer of comets and minor planets, who co-discovered Comet Shoemaker–Levy 9 in 1993, which collided with the planet Jupiter in 1994. His talk was entitled “Talk, Text & Tunes: A Nightwatchman’s Journey.”

Our 2018 Sunday Night Keynote was Marc Rayman

Marc Rayman joined JPL in 1986 where he enjoyed a career highlight with Deep Space 1, which accomplished a spectacular encounter with Comet 19P/Borrelly in 2001. Deep Space 1 gave us the first close up photos of a comet’s nucleus. He is currently mission director and chief engineer of Dawn, which has orbited both inner solar system objects, Vesta and Ceres. Dr. Rayman is very active in public education and outreach programs.

Other noted speakers included: Tim Parker, JPL; Wally Pacholka, night sky photographer; Tim Thompson, JPL; Tim Robertson, JPL; and many others. We are anticipating another exciting speaker list for 2019, so stand by!


The 50th annual RTMC Astronomy Expo will take place from Thursday, May 24th through Monday, May 28th, 2018. It will be held at YMCA Camp Oakes, five miles southeast of Big Bear City, California


Pre-registration is available before May 6th. After May 6th you may register on-site at premium prices. You may register using a printed registration form or on-line with PayPal


Vendors include any business, club, organization, or individual, who wishes to setup a booth and sell any commercial item or service. Clubs can set up for free if they are not selling. A Sponsor has donated to RTMC and is given special recognition both on this website and at the EXPO

Welcome to RTMC

Letter From The President

Welcome to our 50th RTMC! Our engaging speakers will talk on a variety of subjects. If you are a beginner, we have programs with our Beginner’s Corner. Around the camp you will enjoy solar observations during the day and an awesome star party at night featuring large telescopes under mostly moonless skies. Of course, our vendors will tantalize you with their incredible products. So come and be part of the RTMC tradition and experience the sky with friends.