Orbit determination strategy and accuracy for a Comet Rendezvous mission

Miller, James; Wood, Lincoln J.; Week, Connie J.

doi:10.2514/3.25402

Cited by 17 publications

(7 citation statements)

References 2 publications

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“…The differences in the moments of inertia may be determined from the gravity harmonic coefficients, but a particular moment of inertia about any axis cannot be determined from this difference alone (Miller et al 1990). In the PCODP, the joint solution for both the gravity and rotational motion of Eros permits a determination of the principal moments of inertia provided the angular acceleration (or wobble about the principal axes) can be detected by the orbit determination filter.…”

Section: Orbit Determination Strategymentioning

confidence: 99%

“…The second technique uses an independent software set, the Orbit Determination Program (ODP), to process spacecraft Doppler and range data arcs that can include the entire orbital phase of the NEAR spacecraft. PCODP was developed specifically for a mission in orbit about an asteroid or comet (Miller et al 1990). For this approach, the data types used for determining NEAR's orbit are radiometric Xband (8.4-GHz downlink) Doppler and range and optical imaging of landmarks.…”

Section: Orbit Determination Strategymentioning

confidence: 99%

See 1 more Smart Citation

Determination of Shape, Gravity, and Rotational State of Asteroid 433 Eros

Miller¹,

Konopliv²,

Antreasian³

et al. 2002

Icarus

247

122

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Section: Orbit Determination Strategymentioning

confidence: 99%

Section: Orbit Determination Strategymentioning

confidence: 99%

Determination of Shape, Gravity, and Rotational State of Asteroid 433 Eros

Miller¹,

Konopliv²,

Antreasian³

et al. 2002

Icarus

247

122

View full text Add to dashboard Cite

“…The data in the final solution included the groundbased Doppler and range tracking of the macecraft and the Eros landmark observations. These data were combined into one orbit determination solution that solved for the estimated parameters by making a weighted least squares fit to the observational data (6). The dynamic model used in the orbit determination process incorporates the gravity (including relativistic effects) of the sun, the moon, and all nine planets.…”

mentioning

confidence: 99%

Radio Science Results During the NEAR-Shoemaker Spacecraft Rendezvous with Eros

Yeomans

Antreasian

Barriot

et al. 2000

Science

188

102

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We determined the mass of asteroid 433 Eros, its lower order gravitational harmonics, and rotation state, using ground-based Doppler and range tracking of the Near Earth Asteroid Rendezvous (NEAR)-Shoemaker spacecraft and images of the asteroid's surface landmarks. The mass of Eros is (6.687 +/- 0.003) x 10(18) grams, which, coupled with our volume estimate, implies a bulk density of 2. 67 +/- 0.03 grams per cubic centimeter. The asteroid appears to have a uniform density distribution. The right ascension and declination of the rotation pole are 11.37 +/- 0.05 and 17.22 +/- 0.05 degrees, respectively, and at least over the short term, the rotation state of Eros is stable with no measurable free precession of the spin pole. Escape velocities on the surface vary from 3.1 to 17.2 meters per second. The dynamical environment of Eros suggests that it is covered with regolith and that one might expect material transport toward the deepest potential wells in the saddle and 5.5-kilometer crater regions.

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“…Because asteroid Eros is not well approximated by a sphere and may not be homogeneous in composition, gravity field analyses other than the spherical harmonic approach may be important for NEAR. Miller [1988] and Miller et al [1989Miller et al [ , 1990 have completed detailed studies of the orbit determination process while a spacecraft is in orbit about a small solar system body, and they have concluded that the addition of mass concentrations (mascons) to the asteroid's gravity modeling may be necessary to represent the object's gravity field. Miller also noted that while the spacecraft is in orbit about an asteroid, its position in space as a function of time as well as the asteroid's orientation, gravity field, moments of inertia, and rotation state are all intimately tied together.…”

Section: V= (Gm/r) 1 + • • (R/r) L /=2 Rn=0 ß [•Lrn Cos (M•) Q-•lrn Smentioning

confidence: 99%

The NEAR Radio Science investigations

Yeomans¹,

Konopliv²,

Barriot³

1997

J. Geophys. Res.

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Abstract. The science objectives for the Near-Earth Asteroid Rendezvous (NEAR) Radio Science team include determining the masses of asteroids 253 Mathilde (to within 10%) and 433 Eros (<0.1%). While the NEAR spacecraft is in orbit about Eros, the radiometric spacecraft tracking data, the optical landmark tracking data, and the lidar altimetry measurements will be used to determine the gravity field of Eros. Comparisons of this gravity field with one determined from Eros shape models (assuming constant density) will provide constraints upon the internal structure of this asteroid. In addition, the spin state, principal axes, and moments of inertia will be determined as part of the Radio Science activities. A campaign to meet the radio science objectives will require the close cooperation of the NEAR Navigation, Imaging, and Lidar teams.

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Orbit determination strategy and accuracy for a Comet Rendezvous mission

Cited by 17 publications

References 2 publications

Determination of Shape, Gravity, and Rotational State of Asteroid 433 Eros

Determination of Shape, Gravity, and Rotational State of Asteroid 433 Eros

Radio Science Results During the NEAR-Shoemaker Spacecraft Rendezvous with Eros

The NEAR Radio Science investigations

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