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Navy Prototype Optical Interferometer observations of geosynchronous satellites.

Robert B Hindsley1, J Thomas Armstrong, Henrique R Schmitt

  • 1Remote Sensing Division, Naval Research Laboratory, 4555 Overlook Avenue NW, Washington, DC 20375, USA. hindsley@nrl.navy.mil

Applied Optics
|June 16, 2011
PubMed
Summary
This summary is machine-generated.

Astronomers used the Navy Prototype Optical Interferometer (NPOI) to detect interferometric fringes from the geosynchronous satellite DirecTV-9S. This study analyzed satellite glints, revealing insights into their surface properties and scattering behavior.

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Area of Science:

  • Optical Interferometry
  • Satellite Observation
  • Astrophysics

Background:

  • Geosynchronous satellites (geosats) present unique observational challenges.
  • Optical interferometry offers high-resolution capabilities for studying celestial and artificial objects.

Purpose of the Study:

  • To detect interferometric fringes from a geosynchronous satellite using the NPOI.
  • To characterize the glinting surfaces of the geosynchronous satellite DirecTV-9S.

Main Methods:

  • Utilized a 15.9-meter baseline at the Navy Prototype Optical Interferometer (NPOI).
  • Observed the geosynchronous satellite DirecTV-9S during glint events in March 2009.
  • Modeled fringe visibilities using a two-component model (resolved and unresolved).

Main Results:

  • Successfully detected interferometric fringes from DirecTV-9S.
  • The glinting surface model indicated a resolved component (≳3.7 m) and an unresolved component (∼1.1 m).
  • Glint length and specular albedos suggest non-flat surfaces scattering light over ~15°.

Conclusions:

  • The study demonstrates the feasibility of using optical interferometry to study geosynchronous satellites.
  • Satellite glint characteristics provide information about surface properties and reflectivity.
  • Proposed NPOI enhancements (infrared capability, larger telescopes) could improve future geosat observations.