The Ninth Annual AAS/AIAA Space Flight Mechanics Meeting will be held at the Beaver Run Resort in Breckenridge, Colorado, February 7-10, 1999. This meeting is cosponsored by the American Astronautical Society (AAS) and the American Institute of Aeronautics and Astronautics (AIAA). The meeting is organized by the AAS Space Flight Mechanics Technical Committee and the AIAA Astrodynamics Technical Committee.

Papers are sought from all areas of space flight mechanics, including but not limited to :

• Satellite orbital dynamics, perturbation, and stability,
• Earth orbital and planetary mission studies, trajectory design and optimization,
• Orbit determination and tracking
• Autonomous navigation and rendezvous
• Spacecraft attitude dynamics, determination, and control
• Dynamics and control of large space structures, modeling of flexible multi-body dynamics, and estimation of distributed parameter systems
• Space debris
• Advanced estimation methods, data fusion, and nonlinear filtering

Papers dealing with current or future missions are especially encouraged. Examples of these include Lunar Prospector, Mars Pathfinder, Mars Global Surveyor, Mars Surveyor '98 and '01, any of the Discovery-class missions, Space Station, X-38, Cassini, and Mission to Planet Earth programs.

Papers will be accepted on the basis of extended abstracts of approximately 1000 words. These abstracts should contain a clear and concise statement of the problem addressed and the results obtained as well as a few supporting figures and/or tables. The abstracts should have a cover page that contains the mail address, office phone number, fax number, and email address of at least one author who will serve as the primary point of contact.

Final manuscripts are due at the time of the meeting. Authors whose papers are not available in printed form at the time of the meeting will not be allowed to present the paper.

In addition, proposals are solicited for appropriate workshop or mini-symposia topics from prospective session organizers. These topics include but are not limited to:

• Precision orbit determination
• Mission planning
• Libration point orbits
• Intelligent space systems
• Attitude determination and control
• GPS

Special Session on Matlab Applications: Matlab has, over the last 14 years, become the dominant system for doing dynamics analysis, applied mathematics, and scientific programming. We are planning a special session on Matlab applications to astrodynamics- attitude control, attitude determination, orbit determination, and navigation, and are seeking short papers on such Matlab applications. In particular, we are seeking papers and software that the authors may wish to share with others at the conference. Bring your favorite gee-whiz routine and dazzle your colleagues.

Prospective workshop and/or mini-symposium organizers must submit a proposal consisting of a title, brief description of less than 200 words, list of speakers, and the titles of their presentations. One copy of the abstract or workshop proposal should be submitted to both Drs. Robert H. Bishop and Don Mackison by fax, email, or mail at the addresses listed below.