Imaging Photopolarimeter on Pioneer Saturn

@article{Gehrels1980ImagingPO,
  title={Imaging Photopolarimeter on Pioneer Saturn},
  author={Thomas Gehrels and Laurence R. I. Baker and Edward C. Beshore and C. Blenman and James J. Burke and N. D. Castillo and B Dacosta and Johan Degewij and Lyn Doose and Jane W. Fountain and Julian Gotobed and Charles Elman Kenknight and R. Kingston and G. McLaughlin and Robert S. McMillan and R Murphy and P. H. Smith and C. P. Stoll and Robin N. Strickland and Martin George Tomasko and Mahendra P. Wijesinghe and David Lee Coffeen and Larry W. Esposito},
  journal={Science},
  year={1980},
  volume={207},
  pages={434 - 439}
}
An imaging photopolarimeter aboard Pioneer 11, including a 2.5-centimeter telescope, was used for 2 weeks continuously in August and September 1979 for imaging, photometry, and polarimetry observations of Saturn, its rings, and Titan. A new ring of optical depth < 2 x 10–3 was discovered at 2.33 Saturn radii and is provisionally named the F ring; it is separated from the A ring by the provisionally named Pioneer division. A division between the B and C rings, a gap near the center of the… Expand
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References

SHOWING 1-10 OF 24 REFERENCES
Pioneer imaging photopolarimeter optical system.
TLDR
The imaging photopolarimeter aboard the Pioneer 10 spacecraft en route to the vicinity of Jupiter is described, and some performance characteristics and preliminary flight results are presented. Expand
Pioneer Saturn Celestial Mechanics Experiment
TLDR
New theoretical calculations for the Saturn interior are described which use the latest observational data, including Pioneer Saturn, and state-of-the-art physics for the internal composition. Expand
Saturn's rings. I. Optical thickness of rings A, B, D and structure of ring B
Abstract A photometric study of high-resolution (∼0″.3) plates of Saturn taken at the Lowell Observatory in 1943 and 1945 is presented. N-S scans were taken over both the planet and rings. The excessExpand
The Imaging Photopolarimeter Experiment on Pioneer 11
TLDR
One of the highest resolution images obtained is presented here along with a comparison of a sample of the authors' photometric and polarimetric data with a simple model, which seem consistent with increased molecular scattering at high latitudes. Expand
Photometric confirmation of the Encke division in Saturn's ring A
APPROXIMATELY once every 15 yr, it is possible to observe Saturn's satellite lapetus passing through the shadow of the rings. Observations of such events are of great value to studies of the opticalExpand
On a suspected ring external to the visible rings of Saturn
Abstract Reexamination of a photograph of Saturn taken on 15 November 1966, when the earth was nearly in the ring plane, indicates that ring material may exist outside the visible rings, extending toExpand
Trapped Radiation Belts of Saturn: First Look
TLDR
The discovery of a new ring, called the F ring, a new division, the Pioneer division, and a moon, called 1979 S 2, is confirmed and Cosmic-ray albedo neutron decay should be looked into as a source of energetic particles in the inner magnetosphere of Saturn. Expand
Photometry and polarimetry of Jupiter at large phase angles: I. Analysis of imaging data of a prominent belt and a zone from pioneer 10
Limb-darkening curves are derived from Pioneer 10 imaging data for Jupiter's STrZ (−18 to −21° latitude) and SEBn (−5 to −8° latitude) in red and blue light at phase angles of 12, 23, 34, 109, 120,Expand
Saturnian Trapped Radiation and Its Absorption by Satellites and Rings: The First Results from Pioneer 11
TLDR
The inner Saturn magnetosphere, because of its near-axial symmetry and the many discrete radiation absorption regions, offers a unique opportunity to study the acceleration and transport of charged particles in a planetary magnetic field. Expand
Saturn's ring and nearby faint satellites
Abstract Observations of Saturn's rings during passage of the Earth through the ring plane, coupled with those of others, suggest a ring thickness of 1.3 ± 0.3 km. The wide disparity in the opticalExpand
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