Other
Scientific paper
Jan 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974saosr.356.....s&link_type=abstract
SAO Special Report #356 (1974)
Other
6
Scientific paper
Computed orbits of the balloon satellite 1963 30D are given every 2 days over an interval of 456 days near the beginning of the satellite's lifetime and an interval of 824 days near the end of its lifetime. The effects of radiation pressure on the satellite are examined in some detail. It is found that the variations in all the elements can be represented by use of a single parameter to specify the effect of diffuse reflection from the satellite's surface, and that this parameter remains constant, or nearly so, during the entire 7-year lifetime. Success in obtaining a consistent representation of the radiation-pressure effects is ascribed to the inclusion of the effects of terrestrial radiation pressure, using a model for the earth's albedo that includes seasonal and latitudinal variations. "Anomalous" effects in the orbital acceleration, as well as in the other elements, are represented quite well by including a small force at right angles to the solar direction and by allowing this to rotate about the solar direction. This implies that the satellite is aspherical, that it is rotating, and that the axis of rotation precesses. While the period of precession decreases considerably over the lifetime, the magnitude of the right -angle force. remains essentially constant at about 3% of the total force. The effects of atmospheric drag are also examined, and atmospheric densities are derived in several intervals and compared with the J71 model atmosphere. Intervals are included where hydrogen is expected to be the dominant constituent and where helium is expected to be dominant. A revised model of the hydrogen concentration is given for use with the J71 model. Densities indicative of helium are in good agreement with the model, as are densities obtained near the end of the lifetime. The densities near the end vary by about 2.5 orders of magnitude, since the satellite's perigee traverses over 400 km in height in about 200 days; the total range of the density data is over 5.5 orders of magnitude, since the effective height of the density determinations goes from over 3600 km near the beginning to about 360 km near the end of the lifetime.
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