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  • 1
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    The orbit of Lageos and solar eclipses (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An eclipse of the sun by the moon as seen by the Lageos satellite can affect the orbital semimajor axis at the centimeter level. The weakened radiation pressure acting on Lageos perturbs the orbit differently from that due to full sunlight. This difference amounted to less than 2 mm in the semimajor axis for 23 of the 30 eclipses Lageos experienced between launch in 1976 and the end of 1983. However, it was 17.6 mm for the eclipses on 28 March 1979 and 11.2 mm for the one on 15 December 1982. Differences such as these generate large enough along-track errors to make it worthwhile to include eclipses in complex orbit determination programs such as GEODYN which integrate the orbit. Eclipses cannot explain the presently unmolded variations in along-track acceleration which have a magnitude of about 3 x 10(-12) ms(-2).
    Keywords: ASTRODYNAMICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 9399-940
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Earth Albedo and the orbit of LAGEOS (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The long-period perturbations in the orbit of the Lageos satellite due to the Earth's albedo have been found using a new analytical formalism. The Earth is assumed to be a sphere whose surface diffusely reflects sunlight according to Lambert's law. Specular reflection is not considered. The formalism is based on spherical harmonics; it produces equations which hold regardless of whether the terminator is seen by the satellite or not. Specializing to the case of a realistic zonal albedo shows that Lageos' orbital semimajor axis changes periodically by only the a few millimeters and the eccentricity by one part in 100,000. The longitude of the node increases secularly. The effect considered here can explain neither the secular decay of 1.1 mm/day in the semimajor axis nor the observed along-track variations in acceleration of order 2 x 10 to the minus 12 power/sq ms.
    Keywords: ASTRODYNAMICS
    Type: NASA-TM-86210 , REPT-85B0381 , NAS 1.15:86210
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    The orbit of Lageos and solar eclipses (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An eclipse of the Sun by the Moon as seen by the Lageos satellite can affect the orbital semimajor axis at the centimeter level. The weakened radiation pressure acting on Lageos perturbs the orbit differently from that due to full sunlight. This difference amounted to less than 2 mm in the semimajor axis for 23 of the 30 eclipses Lageos experienced between launch in 1976 and the end of 1983. However, it was 17.6 mm for the eclipses on 28 March 1979 and 11.2 mm for the one on 15 December 1982. Differences such as these generate large enough along-track errors to make it worthwhile to include eclipses in complex orbit determination programs such as GEODYN which integrate the orbit. Eclipses cannot explain the presently unmolded variations in along-track acceleration which have a magnitude of about 3 x 10(-12) ms(-2).
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-86076 , NAS 1.15:86076
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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