FOREWORD    vii

PREFACE    ix

MISSION DESIGN: MARS

Architectural Design for a Mars Communications and Navigation Orbital Infrastructure (AAS 99-300), R. J. Cesarone, R. C. Hastrup, D. J. Bell, D. T. Lyons and K. G. Nelson    3

Mars Network Constellation Design Drivers and Strategies (AAS 99-301), Todd A. Ely, Rodney Anderson, Yoaz E. Bar-Sever, David Bell, Joseph Guinn, Moriba Jah, Pieter Kallemeyn, Erik Levene, Larry Romans and Sien-Chong Wu    17

Mars Polar Lander Entry, Descent & Landing Design (AAS 99-302), William H. Willcockson    33

The Strategy for the Second Phase of Aerobraking Mars Global Surveyor (AAS 99-303), M. D. Johnston, P. B. Esposito, V. Alwar, S. W. Demcak, E. J. Graat, P. D. Burkhart and B. M. Portock     53

Aladdin’s Phasing and Mission Orbit Design (AAS 99-304), Yanping Guo    69

Mission Design for the Mars 2003/2005 Sample Return Mission (AAS 99-305), Wayne Lee, Louis D’Amario, Ralph Roncoli and John Smith    85

Mars Orbit Rendezvous Strategy for the Mars 2003/2005 Sample Return Mission (AAS 99-306), Louis A. D’Amario, Willard E. Bollman, Wayne J. Lee, Ralph B. Roncoli, John C. Smith, Ramachandra S. Bhat and Raymond B. Frauenholz    103

Terminal Rendezvous Analysis and Design for the Mars 2003/2005 Sample Return Mission (AAS 99-307), Peter S. Kachmar, Christopher N. D’Souza and Timothy J. Brand    123

FORMATION FLYING/CONSTELLATIONS    133

Guidance Strategies for Satellite Formations (AAS 99-308), Giovanni B. Palmerini    135

Dynamics of Clustered Satellites Via Orbital Elements (AAS 99-309), David F. Chichka    147

Spacecraft Formation Flying Control Using Mean Orbit Elements (AAS 99-310), Hanspeter Schaub, Srinivas R. Vadali, John L. Junkins and Kyle T. Alfriend    163

Elliptical Sun-Synchronous Orbits With Line of Apsides Lying in or Near the Equatorial Plane (AAS 99-311), John E. Draim, Paul J. Cefola, Ronald J. Proulx, Duane Larsen and George Granholm    183

Characteristics of Crosslinks Between Satellites in Large Symmetric Constellations (AAS 99-312), Thomas J. Lang    207

Design and Analysis of Space-Station-Based Micro-Satellite Networks (AAS 99-313), Jianping Yuan, Qun Fang and Juan Wei     219

Using Tessellations for Large Constellation Design (AAS 99-314), Brian Kantsiper and Howard Drake    225

The Multi-Synchronous Technique for Environment Monitoring  by a Satellite Constellation (AAS 99-315), Carlo Ulivieri     245

ATTITUDE CONTROL: THEORY    257

Vibration Reduction for Flexible Spacecraft Following Momentum Dumping With/Without Slewing (AAS 99-316), Arun K. Banerjee, Nelson Pedreiro and William Singhose    259

Satellite Attitude Control and Power Tracking With Momentum Wheels (AAS 99-317), Panagiotis Tsiotras, Haijun Shen, and Chris Hall     275

Mass Expulsion Control for Precision Pointing Spacecraft (AAS 99-318), H. D. Stevens, Jack Rodden and Stephane Carrou     297

On the Control of Space Platform-Based Variable Geometry Manipulaotrs (AAS 99-319), Y. Cao, V. J. Modi, C. W. de Silva and A. K. Misra    305

Initial Guess Schemes for Generating Deflection-Limiting Commands (AAS 99-320), Michael Robertson, William Singhose and Arun Banerjee    327

Sensitivity of Spin-Axis Reorientation Maneuvers (AAS 99-321), Sergei Tanygin and James Woodburn    343

Feasible Trajectory Generation for Underactuated Spacecraft Using Differential Flatness (AAS 99-323), Panagiotis Tsiotras    361

ORBIT DETERMINATION: MISSIONS    379

Lunar Prospector Orbit Determination Uncertainties Using the High Resolution Lunar Gravity Models (AAS 99-325), Eric Carranza, Alex Konopliv and Mark Ryne    381

Orbit Determination for Medium Altitude Orbits Using GPS Receivers and Ground-Based Tracking (AAS 99-326), George R. Granholm, Ronald J. Proulx and Paul J. Cefola    401

Orbit Determination Using Space to Ground Differential GPS in NRL’s Ocean Package (AAS 99-327), Patrick W. Binning, Mark T. Soyka and Jay W. Middour    421

Orbit Determination for Mars Global Surveyor During Mapping (AAS 99-328), F. G. Lemoine, D. D. Rowlands, D. E. Smith, D. S. Chinn, D. E. Pavlis, S. B. Luthcke, G. A. Neumann and M. T. Zuber    435

Nozomi Cis-lunar Phase Orbit Determination (AAS 99-329), Mark Ryne and Kevin Criddle    453

A Comprehensive Orbit Reconstruction for the Galileo Prime Mission in  the J2000 System (AAS 99-330), R. A. Jacobson, R. J. Haw, T. P. McElrath and P. G. Antreasian    465

SOLAR SAILS AND LOW THRUST    487

Near-Optimal Solar Sail Trajectories Generated by a Genetic Algorithm (AAS 99-332), Gerald A. Rauwolf and Alan Friedlander    489

A Technique for Earth Escape Using a Solar Sail (AAS 99-333), Victoria Coverstone-Carroll and John E. Prussing     507

Solar Sail Optimal Orbit Transfers to Synchronous Orbits (AAS 99-334), Robert B. Powers, Victoria Coverstone-Carroll and John E. Prussing    523

Stability of Levitated Cylindrical Orbits by Using Solar Sails (AAS 99-335), Christel van de Kolk    539

Solar Sail Trajectories for Solar Polar and Interstellar  Probe Missions (AAS 99-336), Carl G. Sauer, Jr.    547

Shape-Based Analytic Representations of Low-Thrust Trajectories for Gravity-Assist Applications (AAS 99-337), Anastassios E. Petropoulos, James M. Longuski and Nguyen X. Vinh    563

Preliminary Design of Low-Thrust Interplanetary Missions (AAS 99-338), Jon A. Sims and Steve N. Flanagan    583

Trajectories Towards Near-Earth-Objects Using Solar Electric Propulsion (AAS 99-339), Guido Colasurdo and Lorenzo Casalino    593

Solar Electric Propulsion Earth to Mercury Transfer With Variable Maximum Power (AAS 99-340), M. Guelman and D. Tahan    609

TOPICS IN CONTROL THEORY    621

Reducing Conservatism of Analytic Transient Response Bounds Via Shaping Filters (AAS 99-341), Aiyueh Kwan, Nazareth Bedrossian, Jiann-Woei Jang and Karolos Grigoriadis    623

Disturbance Identification and Rejection Experiments on an Ultra Quiet Platform (AAS 99-342), Stephen G. Edwards, Brij N. Agrawal, Minh Q. Phan and Richard W. Longman    633

The Optimized Interaction Forces in Minimum Time Control of Elbow and SCARA Robots (AAS 99-343), Guido Giese, Richard W. Longman and H. Georg Bock    653

Subtleties in the Use of Zero-Phase Low-Pass Filtering and Cliff Filtering in Learning Control (AAS 99-344), Aaron M. Plotnik and Richard W. Longman    673

Spaceflight Dynamics Support for the MightySat II.1 Hyperspectral Payload Operations (AAS 99-345), Scott Carter, Craig McLaughlin, Chris Sabol and Megan Bir    693

Development of a BAPTA Mechanism for Small Satellites (AAS 99-346), Mário César Ricci and Sebastião E. C. Varotto     711

LAUNCH AND MISSION SUPPORT TOOLS    727

Trajectory Development and Optimization of an RBCC-Based Launch Vehicle (AAS 99-347), Kurt J. Hack and John P. Riehl     729

Aquarius: A Low-Cost, Low-Reliability Launch Vehicle for Carrying Consumables (AAS 99-348), Andrew E. Turner    749

Orbit Analysis Tools Software (Version 1 for Windows^TM) (AAS 99-349), Jenna L. Cox, Jay W. Middour and Robin K. Llewellyn    769

Collision Vision: Covariance Modeling and Intersection Detection for Spacecraft Situational Awareness (AAS 99-351), R. G. Gist and D. L. Oltrogge    783

INTERPLANETARY MISSIONS    797

SpaceTime—A MIDEX Proposal to Test Einstein’s Equivalence Principle (AAS 99-354), Steve Matousek    799

A Light-Weight Inflatable Hypersonic Drag Device for Venus Entry (AAS 99-355), Angus McRonald    819

Venus Surface Sample Return: A Weighty High-Pressure Challenge (AAS 99-356), Ted Sweetser, Jonathan Cameron, Gun-Shing Chen, Jim Cutts, Bob Gershman, Martha S. Gilmore, Jeffrey L. Hall, Viktor Kerzhanovich, Angus McRonald, Erik Nilsen, Walt Petrick, David Rodgers, Carl Sauer, Brian Wilcox, Andre Yavrouian, Wayne Zimmerman, and the Advanced Projects Design Team of the Jet Propulsion Laboratory    831

 Venus and Beyond Using the Ariane ASAP Launch Capability (AAS 99-357), Paul A. Penzo    845

Aerobraking at Venus and Mars: A Comparison of the Magellan and Mars Global Surveyor Aerobraking Phases (AAS 99-358), Daniel T. Lyons    859

The GEM Extension Satellite Tour: Galileo’s Mission Across the Millennium (AAS 99-359), R. J. Haw, J. R. Johannesen, C. A. Halsell, M. G. Wilson and J. L. Pojman    879

Europa Orbiter Mission Trajectory Design (AAS 99-360), Jennie R. Johannesen and Louis A. D’Amario    895

Automated Design of Aerogravity-Assist Trajectories (AAS 99-361), Eugene P. Bonfiglio, James M. Longuski and N. X. Vinh    909
 
 

ORBIT DETERMINATTION    929

Analysis for the Selection of Data Source in the Orbit Determination Process (AAS 99-362), Megan Bir, Scott Carter and Chris Sabol    931

A Fresh Look at Angles-Only Orbit Determination (AAS 99-363), Chris Sabol, Scott Carter and David Vallado    951

Low Orbits Estimation From a Single Ground Station (AAS 99-364), F. Curti and M. Parisse    967

Performance of a Dynamic Algorithm for Processing Uncorrelated Tracks (AAS 99-365), Kyle T. Alfriend and Jong-Il Lim    979

The Naval Space Command Automatic Differential Correction Process (AAS 99-366), D. A. Danielson, David Canright, Deborah N. Perini and Paul W. Schumacher, Jr.    991

A New Approach to GPS Carrier Phase Ambiguity Resolution (AAS 99-367), Michael J. Gabor and R. Steven Nerem    1009

Automated Tuning of an Extended Kalman Filter Using the Downhill Simplex Algorithm (AAS 99-368), Thomas D. Powell     1029

Altitude Effects on Autonomous Orbit Determination (AAS 99-369), Craig A. McLaughlin, Kenn Gold and George H. Born     1041

ATTITUDE DYNAMICS AND CONTROL: APPLICATIONS    1061

Flight Control Overview of STS-88, The First Space Station Assembly Flight (AAS 99-371), Robert Hall, Kim Kirchwey, Michael Martin, Gene Rosch and Doug Zimpfer    1063

Space Station Attitude Control During Payload Operations (AAS 99-372), Nazareth Bedrossian and Edward McCants    1083

GOES On-Orbit Storage Mode Attitude Dynamics and Control (AAS 99-373), Edwin Harvie, Andre Dress and Milt Phenneger     1095

ICESat Attitude Algorithm For Maintained Reference Groundtrack Pointing (AAS 99-374), Daniel G. Kubitschek, Kenneth Gold, Michael Ondrey, Penina Axelrad and George H. Born    1115

Autonomous Control of the PROBA Spacecraft (AAS 99-375), Jean de Lafontaine, Pierrik Vuilleumier and Pieter Van den Braembussche    1131

Integrated Structural and Control Optimization of a Large  Space Structure Using Analytical Sensitivity Analysis (AAS 99-376), Ijar M. Fonseca and Peter M. Bainum    1145

Comparison of Melnikov’s Method and Numerical Simulation for Predicting Nonlinear Dynamics in the Pitch Motion of Actively Controlled Satellites in a Gravity Gradient Field (AAS 99-377), Matthew D. Toniolo, Mokin Lee and Gary L. Gray     1159

ATTDES - Generalized Equations of Motion (AAS 99-378), Donald L. Mackison    1179

ATMOSPHERIC MODELING    1191

Solar Cycle Effects on Thermospheric Density and Satellite Drag (AAS 99-379), Rodney Viereck and JoAnn Joselyn    1193

Atmospheric Density, Solar Activity, and Spacecraft/Satellite Characteristics: An Integrated Relationship for Orbital Lifetime Prediction Assessment (AAS 99-380), J. K. Owens, W. W. Vaughan, K. O. Niehuss and Joseph Minow    1209

Satellite Drag Accuracy Improvements From Neutral Density Model Calibration (AAS 99-381), F. A. Marcos, J. O. Wise, M. J. Kendra, J. N. Bass, D. R. Larson and J. J. Liu    1227

A Methodology for Using Optimal MSIS Parameters Retrieved From SSULI Data to Compute Satellite Drag on LEO Objects (AAS 99-382), A. C. Nicholas, J. M. Picone and S. E. Thonnard     1241

Neutral Atmosphere Density Monitoring Based on Space Surveillance System Orbital Data (AAS 99-383), Paul J. Cefola, Andrey I. Nazarenko, Ronald J. Proulx and Vasiliy Yurasov    1257

Calibration of Semi-Empirical Atmosphere Models Through the Orbital Decay of Spherical Satellites (AAS 99-384), C. Pardini and L. Anselmo    1293

Satellite Drag Accuracy Improvements Estimated From Orbital Energy Dissipation Rates (AAS 99-385), Mark Storz    1307

Utilization of Mars Global Surveyor Accelerometer Data for Atmospheric Modeling (AAS 99-386), R. H. Tolson, G. M. Keating, S. N. Noll, D. T. Baird and T. J. Shellenberg    1329

STATIONKEEPING AND PROXIMITY OPERATIONS     1347

An Operational Approach for Generating Near-Optimal Station Keeping Strategies Via Parallel Genetic Algorithms (AAS 99-387), James E. Smith, Ronald J. Proulx, Paul J. Cefola and John E. Draim    1349

A Practical Stationkeeping Method for Modular Geosynchronous Satellites With Xenon Propulsion System (AAS 99-388), Ahmed Kamel, Walter Gelon and Keith Reckdahl     1371

Impact of Eccentricity on East-West Stationkeeping for the GPS Class of Orbits (AAS 99-389), Todd A. Ely    1391

Earth-Centered Angle Station-Keeping in Low-Earth Orbits With Yaw-Steering Constraints (AAS 99-390), Vincent Martinot and David Vignaux    1409

Maintenance of the ICEsat Exact Repeat Ground Track (AAS 99-391), Peter Demarest and Bob E. Schutz    1419

Close Approach Spacecraft Maneuver Criterion (AAS 99-393), James R Wright    1435

Contingency ISS Rendezvous Recovery Planning by Houston and  Moscow Control Centers (AAS 99-394), Daniel R. Adamo    1449

MISSION DESIGN: NEAR EARTH, EARTH/MOON, AND LIBRATION POINTS    1467

Mission Planning for the CHANDRA X-Ray Observatory (AAS 99-395), Larry D. Mullins, Russell L. Stone and Steven W. Evans    1469

System Design Considerations for a Formosa-X Microsatellite (AAS 99-396), Jeng-Shing Chern    1499

The Lunar Prospector Mission: Results of Trajectory Design, Quasi-Frozen Orbits, Extended Mission Targeting, and Lunar Topography and Potential Models (AAS 99-397), David Folta, Mark Beckman, David Lozier and Ken Galal    1505

Genesis Trajectory Design (AAS 99-398), Julia L. Bell, Martin W. Lo and Roby S. Wilson     1525

Maneuver Design and Calibration for the Genesis Spacecraft (AAS 99-399), Kenneth E. Williams, Philip E. Hong and Dongsuk Han    1539

Triana Mission Design (AAS 99-400), M. Beckman and J. J. Guzman    1549

Optimization of Insertion Cost for Transfer Trajectories to Libration Point Orbits (AAS 99-401), R. S. Wilson, K. C. Howell and M. W. Lo    1569

TRAJECTORY OPTIMIZATION    1587

Numerical Research in Non-Coplanar Orbital Maneuvers (AAS 99-402), Maria Matilde Netto dos Santos Paulo, Antonio Fernando Bertachini de Almeida Prado and Marcelo Lopes Oliveira e Souza    1589

Thrust Programming in Aeroassisted Maneuvers (AAS 99-404), I. Michael Ross    1607

The Optimization of Continuous Constant Acceleration Transfer Trajectories in the Presence of the J₂ Perturbation (AAS 99-405), Jean Albert Kechichian    1627

Necessary and Sufficient Conditions for Optimal Impulsive Rendezvous and Linear Equations of Motions (AAS 99-406), Thomas E. Carter    1649

Optimal, Low-Thrust LEO to GEO/HEO Trajectories (AAS 99-408), A. L. Herman and D. B. Spencer    1663

Optimal DV-Earth-gravity-Assist Trajectories in the Restricted Three-Body Problem (AAS 99-409), Guido Colasurdo and Lorenzo Casalino    1681

Low-Thrust Control Law Development for Transfer From Low Earth Orbits to High Energy Elliptical Parking Orbits (AAS 99-410), Leon P. Gefert and Kurt J. Hack    1695

TETHERS    1713

Altitude Control of a Tethered Lifting Probe for Atmospheric Research (AAS 99-411), Brian L. Biswell and Jordi Puig-Suari    1715

Improved Tether Aerobraking Maneuvers Using a Lifting Probe (AAS 99-412), Brian L. Biswell and Jordi Puig-Suari    1739

Advanced Tether Experiment Deployment Failure (AAS 99-413), Stephen S. Gates, Stephen M. Koss and Michael F. Zedd    1761

A Study of the Planar Deployment Dynamics of the ASTOR Tethered Satellite System (AAS 99-414), Andre P. Mazzoleni and Ryan L. Coles    1781

A Look at Tethered Satellite Identification Using Ridge-Type  Estimation Methods (AAS 99-415), D. A. Cicci, C. Qualls and T. A. Lovell    1801

Modeling Tethered Satellite Systems for Detection and Orbit Determination (AAS 99-416), J. E. Cochran, Jr., S. Cho, T. A. Lovell and D. A. Cicci    1821

Tracking of the TiPS Tethered Satellite System (AAS 99-417), William J. Barnds and Shannon L. Coffey    1843
 
 

PREDICTION/UNCERTAINTY    1855

Nonlinear Methods for the Propagation of Orbital Uncertainty (AAS 99-418), Steven R. Chesley and Andrea Milani    1857

Satellite Drag Error Growth Estimation (AAS 99-419), Felix R. Hoots and Richard G. France    1871

Improved Space Surveillance Network Observation Error Modeling and Techniques for Force Model Error Mitigation (AAS 99-420), William N. Barker, Stephen J. Casali and Cheryl A. H. Walker    1881

Covariance as an Estimator of Orbit Prediction Error Growth for Geosynchronous Orbits (AAS 99-421), Kyle T. Alfriend and Sokwon Paik    1903

Covariance as an Estimator of Orbit Prediction Error Growth in the Presence of Unknown Sensor Biases (AAS 99-422), Kyle T. Alfriend and Matthew P. Wilkins    1913

Monte-Carlo Analysis of Nonimpulsive Orbital Transfers Under Thrust Errors, 1 (AAS 99-424), Antônio Delson Conceição de Jesus, Marcelo Lopes de Oliveira e Souza and Antônio Fernando Bertachini de Almeida Prado    1923

Element Set Prediction Accuracy Assessment (AAS 99-425), Denise A. Kaya and Daniel E. Snow    1937

ATTITUDE ESTIMATION    1957

Spacecraft Angular Velocity Estimation Using Sequential Observations of a Single Vector (AAS 99-426), Yaakov Oshman and François Dellus    1959

How to Estimate Attitude From Vector Observations (AAS 99-427), F. Landis Markley and Daniele Mortari    1979

A Fully-Redundant Set of Single-Axis Accelerometers (AAS 99-429), David Schaechter    1997

Mass-Properties Estimation for Spacecraft With Powerful Damping (AAS 99-430), Mason A. Peck    2005

DIGISTAR II Micro-Star Tracker: Autonomous On-Orbit Calibration and Attitude Estimation (AAS 99-431), Gwanghyoek Ju, Tom Pollock and John L. Junkins     2025

Multiple Approaches for GYRO Calibration of INTELSAT Satellites (AAS 99-432), Kidambi V. Raman    2039

Precision Attitude Estimation With Star Trackers: Experience, Error Models and Their Interpretation (AAS 99-433), David R. Haley    2055

Landsat-4 Attitude Recovery and Other Experiences With Aging Landsat Spacecraft (AAS 99-434), Prafulla K. Misra, Joseph Sedlak, Jim Gregory, Sonny Jones, Ron Smilek, Dave Lorenz, William N. Stewart and Robert Bowser    2067

GUIDANCE AND NAVIGATION    2083

Image Navigation Based on Landmark and Earth Edge Measurements (AAS 99-435), Kwok M. Ong and Ahmed A. Kamel      2085

Low Cost Spacecraft Attitude Determination by Magnetic Orbital Gyrocompassing (AAS 99-436), Jeff Wesley Fisher     2107

SP-Search Star Pattern Recognition for Multiple Fields of View Star Trackers (AAS 99-437), Daniele Mortari and John L. Junkins    2127

Earth-Sun Attitude Sensor: Hardware Design and Ground Tests (AAS 99-438), Daniele Mortari and Stefano Gigli    2145

Autonomous Navigation Using Celestial Objects (AAS 99-439), David C. Folta, Cheryl J. Gramling, Anne C. Long, Dominic S. P. Leung and Sheela V. Belur    2161

Calibration of Radiometric Data for General Relativity and Solar Plasma During the Near-Earth Asteroid Rendezvous Spacecraft Solar Conjunction (AAS 99-440), Connie J. Weeks, James K. Miller and Bobby G. Williams    2179

Navigation Strategy for the Mars 2001 Lander Mission (AAS 99-441), Robert A. Mase, David A. Spencer, John C. Smith and Robert D. Braun    2193

Navigation of Mars Mission - NOZOMI (AAS 99-442), Tsutomu Ichikawa and Takaji Kato    2209

Navigating Mars Global Surveyor Through the Martian Atmosphere: Aerobraking 2 (AAS 99-443), P. B. Esposito, V. Alwar, P. D. Burkhart, S. W. Demcak, E. J. Graat, M. D. Johnston and B. M. Portock     2217

ORBIT DYNAMICS    2237

Troubles With Lambert (AAS 99-444), David Sonnabend    2239

Velocity Distribution of Satellite Breakups (AAS 99-445), James G. Miller    2257

Third Body Short Period Terms in Analytic Orbit Prediction (AAS 99-447), Calina C. Seybold    2265

Relation Between Osculating and Mean Orbital Elements in the Case of the Second Order Theory (AAS 99-448), Edwin Wnuk     2279

On the Improved Orbit Stability Criterion Around an Irregularly Shaped Body (AAS 99-449), Jun’ichiro Kawaguchi and Shoji Yoshikawa    2293

Dynamical Issues Associated With Relative Configurations of Multiple Spacecraft Near the Sun-Earth/Moon L₁ Point (AAS 99-450), B. T. Barden and K. C. Howell    2307

The Genesis Trajectory and Heteroclinic Connections (AAS 99-451), Wang Sang Koon, Martin W. Lo, Jerrold E. Marsden and Shane D. Ross    2327

ATTITUDE DYNAMICS    2345

Velocity Pointing Errors Associated With Spinning Thrusting Spacecraft (AAS 99-452), Daniel Javorsek II and James M. Longuski    2347

Periodic Solutions for a Spinning Asymmetric Rigid Body With Constant Principal Axis Torque (AAS 99-453), R. Anne Gick, Marc H. Williams and James M. Longuski    2365

Object-Oriented Modeling of the Dynamics of Flexible Multibody Systems (AAS 99-454), B. Min, A. K. Misra, X. Cyril, V. J. Modi and C. W. de Silva    2385

Rotational Motions of a Satellite in a Circular Orbit (AAS 99-455), Shuh-Jing (Benjamin) Ying    2405

 Translational Motion of Gravity Gradient Stabilized Satellite Due to Attitude Oscillation (AAS 99-456), Seiya Ueno    2415

Attitude Dynamics of Spinning Bodies With Substantial Mass Loss (AAS 99-457), F. O. Eke and T.-C. Mao    2429

Nonlinear Dynamics of a Viscously Damped Spacecraft With a Flexible Appendage and Time-Dependent Forcing (AAS 99-458), Andrew J. Miller, Gary L. Gray and Andre P. Mazzoleni    2453

Relative Equilibria of Orbiting Gyrostats (AAS 99-459), Christopher D. Hall and Jeffrey A. Beck    2473

A Simplified Variation of Parameters Solution for the Motion of an Arbitrarily-Torqued Asymmetric Rigid Body (AAS 99-460), Jason W. Mitchell and David L. Richardson    2489

ASTEROIDS AND COMETS    2513

Asteroid Close Encounters With Earth: Risk Assessment (AAS 99-461), Andrea Milani, Steven R. Chesley and Giovanni B. Valsecchi    2515

Predicting Close Approaches and Estimating Impact Probabilities for Near Earth Objects (AAS 99-462), Paul W. Chodas and Donald K. Yeomans    2531

Determination of EROS Physical Parameters for Near Earth Asteroid Rendezvous Orbit Phase Navigation (AAS 99-463), J. K. Miller, P. J. Antreasian, R. W. Gaskell, J. Giorgini, C. E. Helfrich, W. M. Owen, B. G. Williams and D. K. Yeomans     2551

Near Earth Asteroid Rendezvous (NEAR) Revised Orbit Phase Trajectory Design (AAS 99-464), C. E. Helfrich, J. K. Miller, P. G. Antreasian, E. Carranza, B. G. Williams, D. W. Dunham, R. W. Farquhar and J. V. McAdams    2569

Preliminary Planning for Near’s Low-Altitude Operations at 433 EROS (AAS 99-465), P. G. Antreasian, C. E. Helfrich, J. K. Miller, W. M. Owen, B. G. Williams, D. K. Yeomans, J. D. Giorgini, D. J. Scheeres, D. W. Dunham, R. W. Farquhar, J. V. McAdams, A. G. Santo and G. A. Heyler    2583

Rendezvous Mission to a First-Apparition Comet (AAS 99-466), Alan Friedlander and John Niehoff    2601

How Much Thrust, Energy, or Propellant Does it Take to Guide a Natural Celestial Body? (AAS 99-467), Nikos Markopoulos     2623

Entry Dispersion Analysis for the Genesis Sample Return Capsule (AAS 99-469), Prasun N. Desai and F. McNeil Cheatwood    2639

APPENDICES    2657

Publications of the American Astronautical Society    2659

Advances in the Astronautical Sciences     2660
Science and Technology Series    2667
AAS History Series    2674

INDEX    2677

Numerical Index    2679

Author Index    2689