May 24th – May 28th 2018

Astronomers! Whether you are a beginner or an advanced amateur astronomer, we welcome you to attend the RTMC Astronomy Expo, Memorial Day weekend 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 Keynote Speaker on Saturday night is 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 will be entitled “Talk, Text & Tunes: A Nightwatchman’s Journey.”

To learn More About the KEYNOTE click here more

Our 2018 Imaging Workshop will be led by Bryan Cogdell

Bryan Cogdell is an astro-photographer & telescope expert with 18 years’ experience in the consumer telescope industry. Bryan is currently Product Manager for astronomical telescope products at Meade Instruments. He specializes in “weekend warrior imaging” and is always traveling to the best dark skies. He has given night sky tours & astrophotography talks around the world, and has recently been a featured speaker at the Sequoia National Park Dark Sky Festival and the Northeast Astro-Imaging Conference. Bryan loves sharing his knowledge & enthusiasm with others. You can find some of his work here on

Breaking News!

This year’s RTMC Astronomy Expo will be held May 24-28, as planned. However, starting in 2019, the RTMC will no longer be held at Camp Oakes on Memorial Day weekend. Camp Oakes has informed us that after this year, they will use that weekend for other events. As an alternative, they are offering weekends in late summer. This will affect our guests and vendors, so we want to inform you in advance. As the RTMC board of directors considers our options, we welcome your input. Feel free to contact us at Martin Carey, RTMC AE President


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.