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Additional resources for A Short Period Cepheid with Variable Spectrum (1916)(en)(5s)

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In the preliminary design phases of a project. the moments of inertia are estimated from the larger elements of the spacecraft (for example the equipment module). In the later phases. the moments will be calculated at the box level (for example a battery). The moments of inertia of some useful shell shapes are summarized in Fig. 11. In the figure. moment of inertia is represented by I. surface area by S. radius by R. and mass by W. Uniform density is assumed. 11 is only a sample of the data available for shells and solids.

Data from the payload may be handled by CDS or handled directly by the payload. Receive commands from the ground communication facility and transmit to the CDS system (uplink). Transmit payload and engineering data to the ground facility (downlink). Receive and re-transmit signals for navigation and tracking. Establish the general arrangement for all spacecraft equipment I) in the launch configuration and 2) in the mission configuration. Provide mechanisms to com'en the spacecrafl from one configuration to the other.

It includes propellants. gases. and the launch vehicle adapter. Cruise mass is the wet or dry mass in interplanetary cruise configuration. It is the" launch mass minus the launch vehicle adapter mass. (All spacecraft with multiple configurations have a mass statement for each). On-orbit dry mass consists of two major parts. the mass of the science instruments plus the platform or bus mass. Propellant and gas masses are not included (hence dry mass). When spacecraft mass is specified. discussed.

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A Short Period Cepheid with Variable Spectrum (1916)(en)(5s) by Shapley H.


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