Past Meetup

NASA's Dawn Mission to the Asteroid Belt by Dr. Marc D. Rayman

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To Boldly Go -- Well, You Know: NASA's Dawn Mission to the Asteroid Belt

The ambitious and exciting Dawn mission, launched in September 2007, is one of NASA's most remarkable ventures into the solar system. The spacecraft has recently completed a spectacular exploration of Vesta and is now traveling to Ceres; these were among the last uncharted worlds in the inner solar system prior to Dawn. They are the two most massive residents of the main asteroid belt, that vast collection of bodies between Mars and Jupiter. Ceres is so large that it is included in the category of dwarf planets, along with Pluto. The alien landscapes Dawn reveals provide humankind with a new perspective on the solar system. Remnants from the time that planets were formed, Ceres and Vesta hold clues that will help scientists understand the dawn of the solar system.

Dawn orbited Vesta from July 2011 to September 2012 and returned astonishing views of this fascinating world. It is the only spacecraft ever to orbit an object in the asteroid belt and is the first ever targeted to orbit any two solar system destinations. Such a mission would be impossible without the use of ion propulsion, a technology that has mostly been in the domain of science fiction, but which was tested extensively on the Deep Space 1 mission, paving the way for Dawn.
Dr. Marc Rayman will give a fascinating and entertaining presentation on the Dawn mission and its use of ion propulsion as well as its two exotic destinations. He also will share the excitement and profundity of controlling a spacecraft in deep space.

Dr. Marc Rayman will give a fascinating and entertaining presentation on the Dawn mission and its use of ion propulsion as well as its two exotic destinations. He also will share the excitement and profundity of controlling a spacecraft in deep space.

Dr. Marc D. Rayman

Marc Rayman is not only a top rocket scientist at NASA's Jet Propulsion Laboratory but also a magnificent communicator. grew up in Toledo, Ohio and earned an A.B. in physics from Princeton University. His undergraduate work focused on astrophysics and cosmology. He received an M.S. in physics from the University of Colorado at Boulder, where he conducted investigations in nuclear physics. He then performed research at the Joint Institute for Laboratory Astrophysics (JILA) on experimental tests of special relativity and atomic and laser physics, and received his Ph.D. there. He continued at JILA as a postdoctoral researcher. Throughout his time at JILA, he worked with Dr. John Hall, who subsequently won a Nobel Prize in Physics.

Dr. Rayman combined his scientific training with his lifelong study and passion for the exploration of space by joining JPL in 1986. His work there has spanned a broad range, including optical interferometry missions to detect planets around other stars, design of a mission to return samples from Mars, a laser altimeter for Mars, the Spitzer Space Telescope, the development of systems to use lasers instead of radios to communicate with interplanetary spacecraft, and more.

In 1994, he helped initiate a new NASA program to characterize highly sophisticated and risky technologies for future space science missions by flying them on dedicated test flights. The first mission of this New Millennium program, Deep Space 1, was launched in October 1998, and he worked on it from its inception in 1995 to its conclusion in 2001. During the course of the project, Dr. Rayman served as chief mission engineer, mission director, and project manager. The new technologies that were tested on DS1 (including such exotic systems as ion propulsion and artificial intelligence) were designed to reduce the cost and risk and to improve the performance of subsequent interplanetary missions. The primary mission was extremely successful and led to a very productive and exciting extension, culminating in a spectacular encounter with Comet Borrelly that yielded the best images that had ever been taken of the nucleus of a comet. The spacecraft remains in orbit around the Sun. he is chief engineer and mission director on a mission that builds on DS1 to study the two largest unexplored worlds in the inner solar system. Launched in September 2007, Dawn is designed to explore two giants of the main asteroid belt, protoplanet Vesta and dwarf planet Ceres, in an ambitious mission that should reveal much about the dawn of the solar system. In July 2011, Dawn became the only spacecraft ever to orbit a resident of the asteroid belt. Following an outstandingly successful investigation of Vesta, it left in September 2012 for its 2015 appointment with mysterious Ceres.

Dr. Rayman is the recipient of numerous honors. Among his awards from NASA are a remarkable three Exceptional Achievement Medals as well as the Outstanding Leadership Medal. He is the only person to have won both the Exceptional Technical Excellence Award and the Exceptional Leadership Award, two of JPL's most prestigious honors. He is also a recipient of the JPL Magellan Award. Asteroid Rayman was named in recognition of his contributions to space exploration.

Marc is very active in education and public outreach. He is a highly regarded and popular speaker, relating the thrill of science and the excitement of discovery, and he has appeared frequently on television and been quoted often in other news media on subjects as wide-ranging as DS1 and Dawn, a fire onboard the Mir space station, the discovery of the top quark, and the profundity of humankind's exploration of the cosmos. His DS1 blog (at ) had an enormous following and gained critical acclaim as it provided an exceptionally entertaining and informative view into the flight of DS1, and his Dawn blog (at ) continues in the same delightful style. Marc is technical advisor and a popular writer for NASA's educational website The Space Place (at (, where his digital alter ego Dr. Marc resides).

In addition to his numerous technical publications in physics and engineering, he has published many articles on Apollo, Skylab, the space shuttle, piloted and robotic missions of the former USSR, interplanetary missions, and a variety of topics in astrophysics, cosmology, and space exploration for reference books, encyclopedias, magazines, and newspapers. of Marc's favorite hobbies is learning about the space activities of all space-faring nations. Since before the age of 10, he has been building an extensive collection of information (and memorabilia) from over 40 nations. (His extraordinary personal collection is featured in a video tour geared for space buffs at ) His other hobbies include international folk dancing (he and his wife teach and dance with the Pasadena Folk Dance Co-op), photography, hiking, cross-country skiing, and other outdoor activities. Marc also holds a black belt in karate. His wife, Dr. Janice Rayman, is a brain scientist and a very experienced mountaineer. They live in La Cañada, California with their cats Milky Way and Regulus, iguana Event Horizon, tropical fish, and a large variety of fauna and flora in their pond.

Monthly General Meeting

The OCA has a general meeting held on the second Friday of every month* at Chapman University.

These meetings are free and open to the general public.

The meetings take place in The Irvine Lecture Hall with seating for approximately 250 people.

The Irvine Lecture Hall (located adjacent to the Hashinger Science Center) is near the south east corner of the campus
and the nearest cross street is East Palm Ave and North Center Street.

The meetings start promptly at 7:30 PM.

The basic agenda, with approximate times, is as shown below.

7:00 PM - 7:30 PM Pre-meeting Slide Show

Arrival of audience. This presentation includes recent astronomical photographs taken by OCA members.

7:30 PM - 7:45 PM Club Announcements
Usually presented by the OCA Secretary, Bob Buchheim.

7:45 PM - 8:15 PM "What's Up?"
Usually presented by OCA Member and Space Artist, Chris Butler.

8:15 PM - 9:15 PM Main Talk
Speakers are often from JPL/Caltech and other major educational and astronomical institutions.
The level of the talks are usually appropriate for anyone who has an interest in this hobby.

9:15 PM - 9:30 PM Refreshments
Break Donuts, coffee, soda are available for a small donation.

9:30 PM - 10:00 PM "Ask an Astronomer"
Anyone can stay behind and ask a panel of experts any burning question related to this hobby.

See all Meetups from SoCal Science Café