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  • 1
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    Execution of Parker Solar Probe's unprecedented flight to the Sun and early results (2021)
    Elsevier
    Details
    Publication Date: 2021-02-01
    Print ISSN: 0094-5765
    Electronic ISSN: 1879-2030
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Solar Probe Plus: Unique Navigation Modeling Challenges (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Solar Probe Plus (SPP) mission is preparing to launch in 2018, and will directly investigate the outer atmosphere of our star. At 9.86 solar radii, SPP must operate in an unexplored regime. The environment and aspects of the mission design present some unique challenges for navigation, particularly in terms of modeling the dynamics. Non-gravitational force models, unique to this mission, are given with analytical expressions. For each of these models (and error sources), a maximum bound on the force perturbation magnitude is quantified numerically. Additionally, the effect of charged particles on radiometric observables is discussed, along with methods being employed to pre-process the measurements. This survey is an overview of unique modeling employed by SPP navigation, but also a reference for future missions traveling near the Sun.
    Keywords: Solar Physics
    Type: JPL-CL-16-3710 , 2016 AIAA/AAS Astrodynamics Specialist Conference; Sep 12, 2016 - Sep 15, 2016; Long Beach, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Initial Navigation Analysis for the Europa Multiple Flyby Mission Concept (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Earth and spacecraft-based observations of the Jovian moon Europa have identified it as the most plausible habitat for extraterrestrial life in our solar system. Recently, NASA has formed a Europa Mission Concept to potentially explore this icy world with a sophisticated instrument suite operating from a spacecraft in orbit about Jupiter. Candidate trajectories have been designed that would use the Jovian moons to repeatedly bring the spacecraft near Europa, providing multiple observation opportunities over the mission duration. This paper describes navigation analyses associated with these trajectories that are being assessed for their operational feasibility. The analysis includes determination of the V requirements for the mission concept and notional spacecraft ephemeris knowledge capability.
    Keywords: Lunar and Planetary Science and Exploration
    Type: AAS 16-502 , JPL-CL-16-0488 , AAS/AIAA Space Flight Mechanics Meeting; Feb 14, 2016 - Feb 18, 2016; Napa, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Cassini Maneuver Experience Through the Last Icy Satellite Targeted Flybys of the Mission (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Cassini spacecraft will reach its spectacular end-of-mission in September 2017, after having spent a successful twenty years in space gathering invaluable scientific data about Saturn, its rings, and moons. Cassini has flown the most complex gravity-assist trajectory ever designed, which requires frequent maneuvering to achieve the desired targets. After so many years in operation the propellant is starting to dwindle, making it of paramount importance that the maneuvers be designed to prioritize preserving propellant. This paper highlights the strategies for 50 planned maneuvers during twelve Titan flybys and the last Dione and Enceladus flybys of the mission.
    Keywords: Lunar and Planetary Science and Exploration
    Type: AAS 16-243 , JPL-CL-16-0430 , AAS/AIAA Space Flight Mechanics Meeting; Feb 14, 2016 - Feb 18, 2016; Napa, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Navigational Challenges for a Europa Flyby Mission (2014)
    In:  Other Sources
    Details
    Publication Date: 2019-08-13
    Description: Jupiter's moon Europa is a prime candidate in the search for present-day habitable environments outside of the Earth. A number of missions have provided increasingly detailed images of the complex surface of Europa, including the Galileo mission, which also carried instruments that allowed for a limited investigation of the environment of Europa. A new mission to Europa is needed to pursue these exciting discoveries using close-up observations with modern instrumentation designed to address the habitability of Europa. In all likelihood the most cost effective way of doing this would be with a spacecraft carrying a comprehensive suite of instruments and performing multiple flybys of Europa. A number of notional trajectory designs have been investigated, utilizing gravity assists from other Galilean moons to decrease the period of the orbit and shape it in order to provide a globally distributed coverage of different regions of Europa. Navigation analyses are being performed on these candidate trajectories to assess the total Delta V that would be needed to complete the mission, to study how accurately the flybys could be executed, and to determine which assumptions most significantly affect the performance of the navigation system.
    Keywords: Astrodynamics; Lunar and Planetary Science and Exploration
    Type: International Symposium on Space Flight Dynamics; May 05, 2014 - May 09, 2014; Laurel, MD; United States
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    NASA TECHNICAL REPORTS
  • 6
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    Orbit Determination Covariance Analyses for the Parker Solar Probe Mission (2017)
    In:  Other Sources
    Details
    Publication Date: 2019-08-06
    Description: This paper details pre-launch navigation covariance analyses for the Parker Solar Probe mission. Baseline models and error assumptions are outlined. The results demonstrate how navigation will satisfy requirements and are used to define operational plans. A few sensitivities are identified and the accompanying investigations are described. Predicted state uncertainty results show that most requirements are met with substantial margin. Moreover, navigation sensitivities may be accommodated operationally and this has been incorporated into project planning. Detailed results are presented only for select launch dates, however twenty unique trajectories (one per launch opportunity) have been assessed.
    Keywords: Astrodynamics
    Type: AAS 17-576 , JPL-CL-CL#17-3920 , AAS/AIAA Astrodynamics Specialist Conference; Aug 20, 2017 - Aug 24, 2017; Stevenson, WA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Cassini Maneuver Experience for the Fourth Year of the Solstice Mission (2014)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: After sixteen years of successful mission operations and invaluable scientific discoveries, the Cassini orbiter continues to tour Saturn on the most complex gravity-assist trajectory ever flown. To ensure that the end-of-mission target of September 2017 is achieved, propellant preservation is highly prioritized over maneuver cycle minimization. Thus, the maneuver decision process, which includes determining whether a maneuver is performed or canceled, designing a targeting strategy and selecting the engine for execution, is being continuously re-evaluated. This paper summarizes the maneuver experience throughout the fourth year of the Solstice Mission highlighting 27 maneuvers targeted to nine Titan flybys.
    Keywords: Astrodynamics
    Type: AIAA Space 2014; Aug 05, 2014 - Aug 07, 2014; San Diego, CA; United States
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    NASA TECHNICAL REPORTS
  • 8
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    Orbit Determination Covariance Analysis for the Europa Clipper Mission (2014)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A new Jovian satellite tour is proposed by NASA, which would include numerous flybys of the moon Europa, and would explore its potential habitability by characterizing the existence of any water within and beneath Europa's ice shell. This paper describes the results of a covariance study that was undertaken on a sample tour to assess the navigational challenges and capabilities of such a mission from an orbit determination (OD) point of view, and to help establish a delta V budget for the maneuvers needed to keep the spacecraft on the reference trajectory. Additional parametric variations from the baseline case were also investigated. The success of the Europa Clipper mission will depend on the science measurements that it will enable. Meeting the requirements of the instruments onboard the spacecraft is an integral part of this analysis.
    Keywords: Astrodynamics; Lunar and Planetary Science and Exploration
    Type: AIAA Space 2014; Aug 05, 2014 - Aug 07, 2014; San Diego, CA; United States
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    NASA TECHNICAL REPORTS
  • 9
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    Updating the Reference Trajectory for the Cassini Solstice Mission (2014)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Cassini-Huygens deep-space probe has successfully completed a four-year prime tour and a two-year extended tour of the Saturnian system. Now in a second extended phase called the Solstice Mission, the Cassini spacecraft will continue to gather data as directed by the reference trajectory until 2017. This paper will describe the process of how a reference trajectory update is prepared and delivered to the project by the navigation team during Solstice Mission flight operations. This paper will also document the timeline of products released and utilized, as well as the study to include an Enceladus occultation observation that occurs in 2016.
    Keywords: Astrodynamics
    Type: International Conference on Space Operations (SpaceOps 2014); May 05, 2014 - May 09, 2014; Pasadena, CA; United States
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    NASA TECHNICAL REPORTS
  • 10
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    Cassini Solstice Mission Maneuver Experience: Year Three (2013)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Solstice Mission is the final extension of the Cassini spacecraft s tour of Saturn and its moons. To accommodate an end-of-mission in 2017, the maneuver decision process has been refined. For example, the Cassini Project now prioritizes saving propellant over minimizing maneuver cycles. This paper highlights 30 maneuvers planned from June 2012 through July 2013, targeted to nine Titan flybys and the final Rhea encounter in the mission. Of these maneuvers, 90% were performed to maintain the prescribed trajectory and preserve downstream delta V. Recent operational changes to maneuver executions based on execution-error modeling and analysis are also discussed.
    Keywords: Astrodynamics; Spacecraft Design, Testing and Performance; Lunar and Planetary Science and Exploration; Space Communications, Spacecraft Communications, Command and Tracking
    Type: AAS 13-717 , 2013 AAS/AIAA Astrodynamics Specialist Conference; Aug 11, 2013 - Aug 15, 2013; Hilton Head, SC; United States
    Format: text
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    NASA TECHNICAL REPORTS
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