2011 AAS/AIAA Astrodynamics Specialist Conference, August 2011

• "Toroidal Path Filter," Paper No. AAS 11-438, AAS/AIAA Astrodynamics Specialist Conference,
  Salvatore Alfano - July 31-August 4, Girdwood, AK.
• Curvilinear Coordinates for Covariance and Relative Motion Operations. Paper AAS 11-464 presented at the AAS/AIAA Astrodynamics Specialist Conference.
  Vallado, David A. and Salvatore Alfano - July 31-August 4, Girdwood, AK.
• Verifying Observational Data for Real World Space Situational Awareness. Paper AAS 11-439 presented at the AAS/AIAA Astrodynamics Specialist Conference.
  Vallado, David A. - July 31-August 4, Girdwood, AK.
• Simulating Space Surveillance Networks. Paper AAS 11-580 presented at the AAS/AIAA Astrodynamics Specialist Conference.
  Vallado, David A. and Jacob D. Griesbach - July 31-August 4, Girdwood, AK.
• Earth Orientation Parameter Considerations for Precise Spacecraft operations. Paper AAS 11-529 presented at the AAS/AIAA Astrodynamics Specialist Conference.
  Bradley, Ben K., and David A. Vallado, Aurore Sibois, and Penina Axelrad - July 31-August 4, Girdwood, AK.

• Sequential Orbit-Estimation with Sparse Tracking. Paper AAS 11-123 presented at the AAS/AIAA Space Flight Mechanics Conference.
  Seago, John H., Jacob Griesbach, James W. Woodburn, and David A. Vallado - February 17-20. New Orleans, LA.

• Advances in Satellite Conjunction Analysis - AMOS 2010 by Robert Hall, Dr. Sal Alfano, and Alan Ocampo

• GOODNESS-OF-FIT TESTS FOR SEQUENTIAL ORBIT DETERMINATION by John H. Seago and David A. Vallado

2010 US Russian Space Surveillance Workshop, Apr 2010

• Evaluating Gooding Angles-only Orbit Determination of Space Based Space Surveillance Measurements by David A. Vallado

2010 International Conference for Astrodynamic Tools and techniques, May 2010

• Orbit Determination Using ODTK Version 6 by David A. Vallado, Richard S. Hujsak, Thomas M. Johnson, John H. Seago, James W. Woodburn
• Orbit Determination Results from Optical Measurements by David A. Vallado, Vladimir Agapov

2010 AAS Born Symposium, May 2010

• Evaluating Gooding Angles-only Orbit Determination of Space Based Space Surveillance Measurements by David A. Vallado

2010 AAS/AIAA Astrodynamics Specialist Conference, August 2010

• Orbit Determination Results from Optical Measurements by David A. Vallado, Vladimir Agapov

2009 AMOS Technical Conference, September 2009

• Analysis of the Iridium 33-Cosmos 2251 Collision by T.S. Kelso

2009 AIAA/AAS Astrodynamics Specialist Conference, August 2009

• Anti-Satellite Engagement Vulnerability by Salvatore Alfano
• Analysis of the Iridium 33-Cosmos 2251 Collision by T.S. Kelso
• Covariance Realism by David A. Vallado and John H. Seago

Fifth European Conference on Space Debris, March-April 2009

• Orbit Determination Issues and Results to Incorporate Optical Measurements in Conjunction Operations by David A. Vallado, T.S. Kelso, Vladimir Agapov, and Igor Molotov
• Improved Conjunction Analysis via Collaborative Space Situational Awareness by T.S. Kelso, David A. Vallado, Joseph Chan, and Bjorn Buckwalter

2009 AAS/AIAA Space Flight Mechanics Meeting, February 2009

• Satellite Conjunction Monte Carlo Analysis by Salvatore Alfano
• The IAU 2000A and IAU 2006 Precession-Nutation Theories and Their Implementation by Vincent Coppola, John H. Seago, and David A. Vallado

3rd International Association for the Advancement of Space Safety Conference, October 2008

• Improved Conjunction Analysis via Collaborative Space Situational Awareness by T.S. Kelso, David A. Vallado, Joseph Chan, and Bjorn Buckwalter

2008 AMOS Technical Conference, September 2008

• Improved Conjunction Analysis via Collaborative Space Situational Awareness by T.S. Kelso, David A. Vallado, Joseph Chan, and Bjorn Buckwalter

2008 AIAA/AAS Astrodynamics Specialist Conference, August 2008

• SGP4 Orbit Determination by David A. Vallado
• SGP4 Orbit Determination Code

2008 AGI User Conference

• A Critical Assessment of Satellite Drag and Atmospheric Density Modeling by David A. Vallado,David Finkleman

2007 US-Russian Space Surveillance Workshop, October 2007

• An Analysis of State Vector Prediction Accuracy by David A. Vallado

2007 AMOS Technical Conference, September 2007

• Analysis of the 2007 Chinese ASAT Test and the Impact of its Debris on the Space Environment by T.S. Kelso

2007 AAS/AIAA Astrodynamics Specialist Conference, August 2007

• A Preliminary Analysis of State Vector Prediction Accuracy by David A. Vallado
• Beta Conjunction Analysis Tool by Salvatore Alfano

2007 AAS/AIAA Space Flight Mechanics Meeting, February 2007

• Review of Conjunction Probability Methods for Short-term Encounters by Salvatore Alfano
• Validation of SGP4 and IS-GPS-200D Against GPS Precision Ephemerides by T.S. Kelso

2006 AMOS Technical Conference, September 2006

• Proximity Operations for Space Situational Awareness by Timothy Carrico, Travis Langster, John Carrico, David Vallado, Mike Loucks, and Salvatore Alfano

2006 AIAA/AAS Astrodynamics Specialist Conference, August 2006

• Revisiting Spacetrack Report #3 by David A. Vallado, Paul Crawford, Richard Hujsak, and T.S. Kelso
• SGP4 Code
• Addressing Nonlinear Relative Motion For Spacecraft Collision Probability by Salvatore Alfano

2006 AAS/AIAA Space Flight Mechanics Meeting, January 2006

• Implementation Issues Surrounding the New IAU Reference Systems for Astrodynamics by David A. Vallado, John H. Seago, and P. Kenneth Seidelmann
• Progress in International Space and Astrodynamics Standards by David Finkleman and Daniel Oltrogge

Eighth Annual Directed Energy Symposium, November 2005

• Contribution of Physical Layer Uncertainties To Directed Energy Applications by Salvatore Alfano, Christopher T. Kucera, and David Finkleman

The Journal of the Astronautical Sciences, Vol. 53, No. 1, January-March 2005

• A Numerical Implementation of Spherical Object Collision Probability by Salvatore Alfano

2005 AAS/AIAA Astrodynamics Specialist Conference, August 2005

• Collision Avoidance Maneuver Planning Tool by Salvatore Alfano
• Using EOP and Solar Weather Data for Real-time Operations by David A. Vallado and T.S. Kelso

2005 AAS/AIAA Space Flight Mechanics Conference, Open Astrodynamics Session, January 2005

Satellite Orbital Conjunction Reports Assessing Threatening Encounters in Space (SOCRATES) by T.S. Kelso and Salvatore Alfano

(PDF 1.17 MB)

(PPT 605 kB)

Standards, Rules, Innovation, and Inhibition by Dr. David Finkleman

(PDF 119 kB)

(PPT 626 kB)

An Analysis of State Vector Propagation Using Differing Flight Dynamics Programs by David A. Vallado

(PDF 639 kB)	(PPT 706 kB)
Download Supporting Data
Revision 2 of original paper

Transforming Space Surveillance to Meet Today’s Space Superiority Needs by David Derocher

(PDF 248 kB)

(PPT 1.93 MB)

An Independent Technical Review Process for Government Developed Models by Michael J. Gabor

(PDF 60 kB)

(PPT 32 kB)

Trust Risk and Aerospace Software - Balance and Optimization by Dr. Sally Baron

(PDF 59 kB)

(PPT 40 kB)

Salvatore Alfano

• Toroidal Path Filter—August 2011 (PDF 524 KB)
• Anti-Satellite Engagement Vulnerability—August 2009 (PDF 1.35 MB)
• Satellite Conjunction Monte Carlo Analysis—February 2009 (PDF 386 kB)
• Beta Conjunction Analysis Tool—August 2007 (PDF 310 kB)
• Review of Conjunction Probability Methods for Short-term Encounters—February 2007 (PDF 1.51 MB)
• Proximity Operations for Space Situational Awareness—September 2006 (PDF 2.41 MB)
• Addressing Nonlinear Relative Motion For Spacecraft Collision Probability—August 2006 (PDF 471 kB)
• Satellite Collision Probability Enhancements—May 2006 (PDF 561 kB)
• Contribution of Physical Layer Uncertainties To Directed Energy Applications—November 2005 (PDF 683 kB)
• Collision Avoidance Maneuver Planning Tool—August 2005 (PDF 704 kB)
• Relating Position Uncertainty to Maximum Conjunction Probability—June 2005 (PDF 1.35 MB)
• Satellite Orbital Conjunction Reports Assessing Threatening Encounters in Space (SOCRATES)—January 2005 (PDF 1.14 MB)
• A Numerical Implementation of Spherical Object Collision Probability—January 2005 (PDF 308 kB)
• Orbital Covariance Interpolation—February 2004 (PDF 130 kB)
• Assessing the Instantaneous Risk of Direct Laser Impingement—September 2003 (PDF 328 kB)
• Determining If Two Solid Ellipsoids Intersect—February 2003 (PDF 240 kB)
• Predictive Avoidance for Ground-Based Laser Illumination—February 2000 (PDF 208 kB)
• A Future Look at Space Surveillance and Operations—February 1999 (PDF 135 kB)
• Determining Satellite Close Approaches, Part II—April 1994 (PDF 1.02 MB)
• Circle-to-Circle Constant-Thrust Orbit Raising—January 1994 (PDF 1.07 MB)
• Rapid Generation of Site/Satellite Timetables—November 1993 (PDF 905 kB)
• Complete Method of Ratios—May 1993 (PDF 1.28 MB)
• Two Variations of Certainty Control—July 1992 (PDF 685kB)
• The Methods of Ratios—April 1992 (PDF 1.11 MB)
• Rapid Determination of Satellite Visibility Periods—April 1992 (PDF 1.22 MB)
• Hypervelocity Orbital Intercept Guidance Using Certainty Control—May 1991 (PDF 1.40 MB)

David Finkleman

• A Critical Assessment of Satellite Drag and Atmospheric Density Modeling—September 2008 (PDF 1 MB)
• A Critical Assessment of Satellite Drag and Atmospheric Density Modeling—August 2008 (PDF 871 kB)
• Progress in International Space and Astrodynamics Standards—January 2006 (PDF 494 kB)
• Contribution of Physical Layer Uncertainties To Directed Energy Applications—November 2005 (PDF 683 kB)
• Space Standards, Rules, Innovation, and Inhibition—January 2005 (PDF 118 kB)

T.S. Kelso

• Analysis of the Iridium 33-Cosmos 2251 Collision—September 2009 (PDF 3.13 MB)
• Analysis of the Iridium 33-Cosmos 2251 Collision—August 2009 (PDF 2.91 MB)
• Improved Conjunction Analysis via Collaborative Space Situational Awareness—April 2009 (PDF 609 kB)
• Orbit Determination Issues and Results to Incorporate Optical Measurements in Conjunction Operations—April 2009 (PDF 1.38 MB)
• Improved Conjunction Analysis via Collaborative Space Situational Awareness—October 2008 (PDF 491 kB)
• Improved Conjunction Analysis via Collaborative Space Situational Awareness—September 2008 (PDF 789 kB)
• Analysis of the 2007 Chinese ASAT Test and the Impact of its Debris on the Space Environment—September 2007 (PDF 1.24 MB)
• Validation of SGP4 and IS-GPS-200D Against GPS Precision Ephemerides—February 2007 (PDF 710 kB)
• Revisiting Spacetrack Report #3—August 2006 (PDF 1.12 MB)
• Using EOP and Space Weather Data for Satellite Operations—August 2005 (PDF 803 kB)
• Satellite Orbital Conjunction Reports Assessing Threatening Encounters in Space (SOCRATES)—January 2005 (PDF 1.14 MB)
• Space Surveillance Contributions to the STS 107 Accident Investigation—February 2004 (PDF 148 kB)
• Articles by T.S. Kelso in Satellite Times
• Temporal Clustering in the Multi-Target Tracking Environment—July 1988 (PDF 1.65 MB)

David A. Vallado

• Orbit Determination Results from Optical Measurements—August 2010 (PDF 2 MB)
• Orbit Determination Results from Optical Measurements—May 2010 (PDF 567 KB)
• Evaluating Gooding Angles-only Orbit Determination of Space Based Space Surveillance Measurements—May 2010 (PDF 2 MB)
• Orbit Determination Using ODTK Version 6—May 2010 (PDF 2 MB)
• Evaluating Gooding Angles-only Orbit Determination of Space Based Space Surveillance Measurements—April 2010 (PDF 2 MB)
• GOODNESS-OF-FIT TESTS FOR SEQUENTIAL ORBIT DETERMINATION—February 2010 (PDF 739 KB)
• Covariance Realism—August 2009 (PDF 436 kB)
• Improved Conjunction Analysis via Collaborative Space Situational Awareness—April 2009 (PDF 609 kB)
• Orbit Determination Issues and Results to Incorporate Optical Measurements in Conjunction Operations—April 2009 (PDF 1.38 MB)
• The IAU 2000A and IAU 2006 Precession-Nutation Theories and Their Implementation—February 2009 (PDF 562 kB)
• Improved Conjunction Analysis via Collaborative Space Situational Awareness—October 2008 (PDF 491 kB)
• A Critical Assessment of Satellite Drag and Atmospheric Density Modeling—September 2008 (PDF 1 MB)
• Improved Conjunction Analysis via Collaborative Space Situational Awareness—September 2008 (PDF 789 kB)
• A Critical Assessment of Satellite Drag and Atmospheric Density Modeling—August 2008 (PDF 871 kB)
• SGP4 Orbit Determination—August 2008 (PDF 461 kB)
• An Analysis of State Vector Prediction Accuracy—October 2007 (PDF 685 kB)
• A Preliminary Analysis of State Vector Prediction Accuracy—August 2007 (PDF 746 kB)
• Proximity Operations for Space Situational Awareness—September 2006 (PDF 2.41 MB)
• Revisiting Spacetrack Report #3—August 2006 (PDF 1.12 MB)
• Implementation Issues Surrounding the New IAU Reference Systems for Astrodynamics—January 2006 (PDF 343 kB)
• Using EOP and Space Weather Data for Satellite Operations—August 2005 (PDF 803 kB)
• An Analysis of State Vector Propagation Using Differing Flight Dynamics Programs—January 2005 (PDF 639 kB)
• Covariance Transformations for Satellite Flight Dynamics Operations—August 2003 (PDF 333 kB)
• A Summary of Astrodynamic Standards—August 2001 (PDF 111 kB)
• The Coordinate Frames of the US Space Object Catalogs—August 2000 (PDF 111 kB)
• A Fresh Look at Angles-Only Orbit Determination—August 1999 (PDF 1.11 MB)
• A Future Look at Space Surveillance and Operations—February 1999 (PDF 135 kB)
• Software for Astrodynamics—February 1999 (PDF 94 kB)
• An Analysis of the Behavior of the J2000 Reduction Matrices—February 1998 (PDF 355 kB)
• Accurate Orbit Determination from Short-arc Dense Observational Data—August 1997 (PDF 328 kB)
• Satellite Ephemeris Error Model (SEEM) Implementation/Validation on Government Micro-Computers—January 1989 (PDF 802 kB)