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Measuring Absolute Thermospheric Densities And Accommodation Coefficients Using Paddlewheel Satellites: Past Findings, Present Uses, And Future Mission Concepts

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Abstract

The first absolute measurement of thermospheric density was made by combining simultaneous observations of spin and semimajor axis decay of Explorer VI. Providing two independent measures of the interaction with the airstream enabled the determination of both air density and drag coefficient. Then by using a realistic model of the gas-surface interaction, the energy accommodation coefficient was determined. Only four such measurements were made prior to the time of writing. In this paper, we review the history of paddlewheel measurements and explain their importance to ongoing work in satellite drag. Next, a novel concept for paddlewheel satellites based on the CubeSat platform is discussed along with the relevant design parameters. A rudimentary error analysis for paddlewheel measurements evaluated the feasibility of these designs and it was found that the drag torques generated on a three-kilogram paddlewheel are within the measurement capabilities of today’s technologies. For certain types of paddlewheel configurations, the use of direct simulation methods is important for accurately analyzing the data. This is because a paddlewheel with the spin axis oriented in the orbit normal direction undergoes significant flow-shadowing and this is not easily represented by analytical methods. Increasing the availability of accommodation measurements via the paddlewheel method represents an improvement in the accuracy of Earth’s total density models as well as the understanding of gas-surface interactions in low Earth orbit. This is of profound importance in the prediction of satellite orbits as well as the understanding of atmospheric phenomena.

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Authors and Affiliations

  1. Department of Aerospace Engineering Sciences, Boulder, CO, 80309-0429, USA

    Marcin D. Pilinski (Graduate Research Assistant)

  2. Space Environment Technologies, Irvine, CA, USA

    Kenneth Moe (Senior Research Scientist)

  3. Department of Aerospace Engineering Sciences, Colorado Center for Astrodynamics Research (CCAR), Research and Engineering Center for Unmanned Vehicles (RECUV), Boulder, CO, 80309-0429, USA

    Scott E. Palo (Associate Professor)

  4. Department of Aerospace Engineering Sciences, Boulder, CO, 80309-0422, USA

    Brian M. Argrow (Professor, Director Research and Engineering Center for Unmanned Vehicles (RECUV)

Authors
  1. Marcin D. Pilinski
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  2. Kenneth Moe
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  3. Scott E. Palo
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  4. Brian M. Argrow
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Pilinski, M.D., Moe, K., Palo, S.E. et al. Measuring Absolute Thermospheric Densities And Accommodation Coefficients Using Paddlewheel Satellites: Past Findings, Present Uses, And Future Mission Concepts. J of Astronaut Sci 58, 531–549 (2011). https://doi.org/10.1007/BF03321184

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