Optical navigation during the Voyager Neptune encounter

Riedel, Joseph E.; Owen, W. M.; Stuve, J. A.; Synnott, S. P.

doi:10.2514/6.1990-2877

Cited by 29 publications

(17 citation statements)

References 2 publications

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“…These OpNavs were prorecomputing the total radiation pressure actcessed with the Jet Propulsion Laboratory's ing on a model of the NEAR spacecraft. Optical Navigation Program (8).…”

Section: Orbit Of Earthmentioning

confidence: 99%

Estimating the Mass of Asteroid 433 Eros During the NEAR Spacecraft Flyby

Yeomans

Antreasian

Cheng

et al. 1999

Science

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The Near Earth Asteroid Rendezvous (NEAR) spacecraft flew within 3830 kilometers of asteroid 433 Eros on 23 December 1998. The gravitational perturbation on NEAR was evident in the spacecraft tracking data. Ground-based Doppler and range tracking of the spacecraft as well as spacecraft images of the asteroid's center of figure and surface features were used to determine the mass and rotation pole of Eros. The mass of Eros is (7.2 +/- 1.8) x 10(18) grams and, coupled with a volume estimate provided by the NEAR imaging team, this mass suggests a bulk density of 2.5 +/- 0.8 grams per cubic centimeter. The rotation pole position is 15.6 (+/-3.7) degrees in right ascension and 16.4 (+/-1.8) degrees in declination, which is consistent with ground-based and NEAR imaging team observations.

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“…These OpNavs were prorecomputing the total radiation pressure actcessed with the Jet Propulsion Laboratory's ing on a model of the NEAR spacecraft. Optical Navigation Program (8).…”

Section: Orbit Of Earthmentioning

confidence: 99%

Estimating the Mass of Asteroid 433 Eros During the NEAR Spacecraft Flyby

Yeomans

Antreasian

Cheng

et al. 1999

Science

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“…In order to meet these constraints, Optical Navigation (OpNav) images taken from visible-light camera(s) onboard the carrier spacecraft 4 will be used to supplement traditional radiometric tracking in the navigation solution [21]. OpNav is a common data type for interplanetary and small body rendezvous [22] [23] [24], and was recently used for the New Horizons encounter at Pluto [25]. OpNav image processing begins shortly after acquisition of the Saturn system.…”

Section: Tops Optical Navigationmentioning

confidence: 99%

Aerocapture design study for a Titan polar orbiter

Nixon

Kirchman

Esper

et al. 2016

2016 IEEE Aerospace Conference

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In 2014 a team at NASA Goddard Space Flight Center (GSFC) studied the feasibility of using active aerocapture to reduce the chemical ΔV requirements for inserting a small scientific satellite into Titan polar orbit. The scientific goals of the mission would be multi-spectral imaging and active radar mapping of Titan's surface and subsurface. The study objectives were to: (i) identify and select from launch window opportunities and refine the trajectory to Titan; (ii) study the aerocapture flight path and refine the entry corridor; (iii) design a carrier spacecraft and systems architecture; (iv) develop a scientific and engineering plan for the orbital portion of the mission. Study results include: (i) a launch in October 2021 on an Atlas V vehicle, using gravity assists from Earth and Venus to arrive at Titan in January 2031; (ii) initial aerocapture via an 8-km wide entry corridor to reach an initial 350×6000 km orbit, followed by aerobraking to reach a 350×1500 km orbit, and a periapse raise maneuver to reach a final 1500 km circular orbit; (iii) a three-part spacecraft system consisting of a cruise stage, radiator module, and orbiter inside a heat shield; (iv) a 22-month mission including station keeping to prevent orbital decay due to Saturn perturbations, with 240 Gb of compressed data returned. High-level issues identified include: (i) downlink capability-realistic downlink rates preclude the desired multispectral, global coverage of Titan's surface; (ii) power-demise of the NASA ASRG (Advanced Stirling Radioisotope Generator) program, and limited availability at present of MMRTGs (Multi-Mission Radioisotope Generators) needed for competed outer planet missions; (iii) thermal-external radiators must be carried to remove 4 kW of waste heat from MMRTGs inside the aeroshell, requiring heat pipes that pass through the aeroshell lid, compromising shielding ability; (iv) optical navigation to reach the entry corridor; (v) the NASA requirement of continuous critical event coverage for the orbiter, especially during the peak heating of the aerocapture when the radio link will be broken. In conclusion, although Titan aerocapture allows for considerable savings in propellant mass, this comes at a cost of increased mission complexity. Further architecture study and refinement is required to reduce high-level mission risks and to elucidate the optimum architecture.

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“…Data partial derivatives of such observations are purely geometrical (Refs. 5,6), and are easily and reliably computed onboard a spacecraft. Calibrations for such observables are readily made by taking images of star fields and calibrating the distortion in the camera.…”

Section: Observable Modelingmentioning

confidence: 99%

AutoNav Mark3: Engineering the Next Generation of Autonomous Onboard Navigation and Guidance

Riedel

Bhaskaran

Eldred

et al. 2006

AIAA Guidance, Navigation, and Control Conference and Exhibit

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, demonstrated the power of autonomous navigation technology for the Deep Impact Mission. This software is being planned for use as the onboard navigation, tracking and rendezvous system for a Mars Sample Return Mission technology demonstration, and several mission proposals are evaluating its use for rendezvous with, and landing on asteroids. Before this however, extensive re-engineering of AutoNav will take place. This paper describes the AutoNav systems-engineering effort in several areas: extending the capabilities, improving operability, utilizing new hardware elements, and demonstrating the new possibilities of AutoNav in simulations.

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Optical navigation during the Voyager Neptune encounter

Cited by 29 publications

References 2 publications

Estimating the Mass of Asteroid 433 Eros During the NEAR Spacecraft Flyby

Estimating the Mass of Asteroid 433 Eros During the NEAR Spacecraft Flyby

Aerocapture design study for a Titan polar orbiter

AutoNav Mark3: Engineering the Next Generation of Autonomous Onboard Navigation and Guidance

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