Cassini-Huygens Maneuver Experience: Second Year of Saturn Tour

Wagner, Sean V.; Gist, Emily M.; Goodson, Troy; Hahn, Yungsun; Stumpf, Paul W.; Williams, P.

doi:10.2514/6.2006-6663

Cited by 15 publications

(10 citation statements)

References 2 publications

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“…With the rate of cancellations increasing to 1 out of 3 maneuvers during the second year of the Cassini tour, and with an even higher rate of cancellation candidates, streamlining the maneuver cancellation process became a top priority for the Cassini-Huygens Project. 9 This led to the introduction of the maneuver cancellation presentation package by the maneuver team, a package designed to facilitate discussions of canceling a maneuver during navigation maneuver meetings. This package had later evolved to also be an avenue of exploring alternate maneuver strategies, such as delaying a maneuver to its backup location or performing another maneuver in lieu of the maneuver being designed.…”

Section: Maneuver Cancellation Discussionmentioning

confidence: 99%

Communicating Navigation Data Inside the Cassini-Huygens Project: Visualizations and Tools

Wagner

Gist

Goodson

et al. 2008

AIAA/AAS Astrodynamics Specialist Conference and Exhibit

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Section: Maneuver Cancellation Discussionmentioning

confidence: 99%

Communicating Navigation Data Inside the Cassini-Huygens Project: Visualizations and Tools

Wagner

Gist

Goodson

et al. 2008

AIAA/AAS Astrodynamics Specialist Conference and Exhibit

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“…Goodson et al [28], Standley [29], and Wagner et al [30] describe the engineering operations and maneuver experience during the mission. The Cassini primary mission ended in July 2008 [11], with an extended mission planned until June 2010 [12].…”

Section: Background Of the Cassini-huygens Missionmentioning

confidence: 99%

Saturn Impact Trajectories for Cassini End-of-Mission

Yam

Davis

Longuski

et al. 2009

Journal of Spacecraft and Rockets

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Potential end-of-mission scenarios to be considered for the Cassini spacecraft must satisfy planetary quarantine requirements designed to prevent contamination of a pristine environment, which could include Titan and the other Saturnian moons. One assumed acceptable option for safe disposal of the spacecraft includes Saturn impact trajectories. Two classes of impact trajectories are investigated: short-period orbits characterized by periods of 6-10 days and long-period orbits with periods greater than 850 days. To impact Saturn with short-period orbits, a series of successive Titan flybys is required to increase inclination and decrease periapsis to within Saturn's atmosphere, while simultaneously avoiding the rings and mitigating V expenditures. To ensure that the spacecraft is not prematurely damaged by material in the rings, Tisserand graphs are employed to determine when the ring-plane crossing distance is within the F-G ring gap: the necessary geometry for the penultimate transfer. For long-period impact trajectories, solar gravity is exploited to significantly lower periapsis. Depending on the size and orientation of the long-period orbit, a maneuver (<50 m=s) at apoapsis must be added to ensure impact. For sufficiently large orbits with favorable characteristics, solar gravity alone drops the spacecraft's periapsis into Saturn's atmosphere. No maneuver is necessary after the final Titan flyby, providing an attractive "flyby-and-forget" option. Nomenclature a = semimajor axis, km or R S e = eccentricity h = specific angular momentum, km 2 =s h p = flyby altitude, km i rel = inclination relative to the gravity-assist body's orbit, deg J 2 = Saturn's oblateness coefficient m = number of gravity-assist body orbits about the central body n = number of spacecraft orbits about the central body p = semilatus rectum, km or R S R S = Saturn's radius, km (R S 60; 268 km) R T = Titan's radius, km (R T 2575 km) r = position vector from the central body, km or R S r = radial distance from center of Saturn to spacecraft, km or R S r a = radius of apoapsis from central body, km or R S r enc = radial distance of encounter from central body, km or R S r p = radius of periapsis from central body, km or R S r vac = radial distance of vacant node from central body, km or R S T = orbital period, day V = velocity vector relative to the central body, km=s V 1 = hyperbolic excess velocity vector, km=s v = velocity magnitude relative to the central body, km=s v 1 = hyperbolic excess velocity magnitude, km=s = pump angle, deg = flight-path angle, deg V = change in velocity magnitude, km=s = flyby bending angle, deg = flyby B-plane angle, deg = crank angle, deg = gravitational parameter, km 3 =s 2 = orientation of the spacecraft orbit relative to the sunSaturn line, deg Subscripts ga = quantity for the gravity-assist body sc = quantity for the spacecraft

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“…Previously written papers describe maneuvers planned and performed during interplanetary cruise and the first three years of the Saturn tour. [5][6][7][8][9][10] The prime tour experiences were utilized for extended tour maneuver planning.…”

Section: Figure 1 Interaction Within Cassini Navigationmentioning

confidence: 99%

Orbit Control Operations for the Cassini-Huygens Mission

Williams

Gist

Goodson

et al. 2008

SpaceOps 2008 Conference

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The Cassini-Huygens spacecraft was launched in 1997 as an international and collaborative mission to study Saturn and its many moons. After a seven-year cruise, Cassini began orbiting Saturn for a four-year tour. This paper gives an overview of the maneuver operations component of Cassini navigation. Specifically, this paper reviews the orbit control and staffing strategies developed and executed as a result of these maneuver experiences. Examples of maneuver processing and analysis are also shown.

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Cassini-Huygens Maneuver Experience: Second Year of Saturn Tour

Cited by 15 publications

References 2 publications

Communicating Navigation Data Inside the Cassini-Huygens Project: Visualizations and Tools

Communicating Navigation Data Inside the Cassini-Huygens Project: Visualizations and Tools

Saturn Impact Trajectories for Cassini End-of-Mission

Orbit Control Operations for the Cassini-Huygens Mission

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