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Satellite Drag Atmospheric Density Values


Availability: Data Accessible Elsewhere

Time span: 1964-01-31 to 1969-06-05


Atmospheric density values computed from Echo 2 drag data are contained in the Smithsonian Institution Astrophysical Observatory (SAO) Special Report no. 348. These density values were computed for a standard height of 1130 km and cover the time period between January 31, 1964, and June 5, 1969. The data are primarily in tabular form, with some summary graphs for comparing changes in density as a function of temperature (diurnal and semiannual means), 10.7-cm solar flux, and daily geomagnetic index. The tabulated density values are listed chronologically. Also included in these tables are the observed rate of change of anomalistic period, acceleration due to solar radiation pressure, perigee height, the difference in right ascension between spacecraft at perigee and the sun, the difference in declination between perigee and the sun, and the nighttime temperature computed from the perigee value by use of Jacchia's model of diurnal temperature variation.

Alternate Names

  • Atmospheric Drag Density Tables


  • Earth Science: None assigned


  • 64-004A-03A

Additional Information



Questions and comments about this data collection can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. Luigi G. JacchiaData ProviderSmithsonian Astrophysical Observatory
Dr. Jack W. SloweyGeneral ContactSmithsonian Astrophysical Observatory
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