Long-periodic and secular perturbations to the orbits of Explorer 19 and Lageos due to direct solar radiation pressure

Harwood, N. M.; Swinerd, G.G.

doi:10.1007/bf00692070

Cited by 7 publications

(7 citation statements)

References 5 publications

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“…The difference between these two vectors contains information regarding the mismodelling of the long-period perturbations within the SATAN code. The full method has been described previously and will not be repeated here (Harwood and Swinerd, 1995).…”

Section: Methodsmentioning

confidence: 99%

“…The results showed some significant discrepancies in the recovered parameter values when compared with the results from short-arc analyses. Another long-term analysis by Harwood and Swinerd (1996) over a 2-year period utilized a novel long-period analysis technique (Harwood and Swinerd (1995) in order to determine the ocean tidal coefficients.…”

Section: Introductionmentioning

confidence: 99%

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Ocean-tide parameters from the simultaneous long-period analysis of the orbits of Starlette and Stella

Harwood

Swinerd

1997

Ann. Geophys.

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Abstract. The orbits of two geodetic satellites, Starlette and Stella, have been analysed in order to determine ocean-tide parameters. The orbit of Starlette has been determined over a three-year period and Stella over a one-year period. Long-period analysis techniques have been used to determine the evolutions of the orbital inclination, eccentricity and right ascension of the ascending node for each satellite due to ocean tides. The ocean-tide parameters have been determined in a simultaneous fitting of the theoretical orbital variations to the observed variations. The results are compared with ocean-tide models.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ocean-tide parameters from the simultaneous long-period analysis of the orbits of Starlette and Stella

Harwood

Swinerd

1997

Ann. Geophys.

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“…Due to the presence of the Earth"s shadow, the increase in energy that the spacecraft gains over the half of the orbit while moving away from the Sun is not balanced by the energy loss when moving towards the Sun. This effect is greater the more marked is the asymmetry of the orbit geometry with respect to the Sun-line (i.e., (19) in which the Sun-synchronous condition is satisfied and only one variation, either semi-major axis or eccentricity is zero. These solutions are shown in Fig.…”

Section:  mentioning

confidence: 98%

“…(18) and Eq. (19). According to this definition we define the sections of long-lived orbits surface as:…”

Section: Long-term Orbit Evolutionmentioning

confidence: 99%

Orbital Dynamics of "Smart-Dust" Devices with Solar Radiation Pressure and Drag

Colombo

McInnes

2011

Journal of Guidance, Control, and Dynamics

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This paper investigates how perturbations due to asymmetric solar radiation pressure, in the presence of Earth shadow, and atmospheric drag can be balanced to obtain long-lived Earth centered orbits for swarms of micro-scale "smart dust" devices, without the use of active control. The secular variation of Keplerian elements is expressed analytically through an averaging technique. Families of solutions are then identified where Sun-synchronous apse-line precession is achieved passively to maintain asymmetric solar radiation pressure. The long-term orbit evolution is characterized by librational motion, progressively decaying due to the non-conservative effect of atmospheric drag. Long-lived orbits can then be designed through the interaction of energy gain from asymmetric solar radiation pressure and energy dissipation due to drag. In this way, the usual short drag lifetime of such high area-to-mass spacecraft can be greatly extended (and indeed selected). In addition, the effect of atmospheric drag can be exploited to ensure the rapid end-of-life decay of such devices, thus preventing long-lived orbit debris.

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“…However, it has been shown from analysis (Afonso, 1985;Harwood, 1995) of LAGEOS data that atmospheric drag still has a measurable effect at 6000 km. For the current analysis of the needles orbits the CIRA72 model atmosphere (COSPAR, 1972;Jacchia, 1970) was selected for use in the drag computations.…”

Section: Atmospheric Drag Perturbationmentioning

confidence: 99%

Orbit perturbation analysis of West Ford needles clusters

Bowman

Barker²,

Schick³

2000

Astrodynamics Specialist Conference

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Abstract. The West Ford package placed in orbit in 1963 contained almost 500 million copper dipoles. Due to a delay in releasing the needles in orbit a number of clusters of needles formed. Analysis of 34 years of mean orbital elements of 20 different clusters has revealed perturbations of 10 km or more in the semimajor axis due to direct solar radiation pressure, atmospheric drag, and Earth albedo pressure. The orbits have perigee heights ranging from 1500 km to 3600 km. A simplified Earth albedo model has been adopted to account for the long periodic perturbations observed in the semi-major axis. The periodic terms are a function of the sun and cluster nodal longitude angles. The atmospheric drag perturbation was modeled by extending the CIRA72 model atmosphere to heights above 2000 km. Cluster area-to-mass ratios were determined from fitting direct solar radiation pressure coefficients over 25 to 30 year data spans. Twenty to thirty year semi-major axis fits produced mean atmospheric density factors for hydrogen and helium for each cluster. These factors show a very high correlation with average perigee height. The results show that average hydrogen concentrations are from 3 to 5 times greater than given by the CIRA72 model. Helium concentrations also are from 1.5 to 4 times greater than predicted for these heights.

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Long-periodic and secular perturbations to the orbits of Explorer 19 and Lageos due to direct solar radiation pressure

Cited by 7 publications

References 5 publications

Ocean-tide parameters from the simultaneous long-period analysis of the orbits of Starlette and Stella

Ocean-tide parameters from the simultaneous long-period analysis of the orbits of Starlette and Stella

Orbital Dynamics of "Smart-Dust" Devices with Solar Radiation Pressure and Drag

Orbit perturbation analysis of West Ford needles clusters

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