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pio11_v_c_o_TPMBK (AC79-9111.4)**

This Pioneer 11 photograph of Saturn’s rings, supposedly taken on August 31, 1979, at a distance of 943,000 km (585,950 miles) from the planet, revealed amazing detail (for that time). Although now crude & primitive, this historic photograph revealed a new feature in the Cassini Division (commonly referred to as the ‘Cassini Gap’ previously), new features in the A-Ring, the discovery of the F-Ring, and a new moon, then designated 1979-S1. Although some uncertainty exists, the moon was likely/possibly Epimetheus, named so in 1983, following higher resolution imaging by the Voyager 1 spacecraft, along with more refined orbital calculations. However, caveat to the above is a reference to Epimetheus (at an ‘official’ NASA website mind you) as 1980-S3, so call it whatever you want. Tethys is to the upper left.

 

I clearly remember this photograph and its revelatory significance, so I naively expected a Google image search to reveal a JPL photo ID number…accompanied by a well-written & informative description.

NOPE. Nothing. Nada. Squat. Zip. Zilch. Zed. ZERO. What the hell was I thinking? The Ames Research Center photo ID hand-written on the verso also yields nothing.

 

So, the above is my take from the content available at the following. Better than nothing:

 

On page 123:

 

atmos.nmsu.edu/data_and_services/atmospheres_data/SATURN/...

 

And:

 

www.nasa.gov/image-feature/45-years-ago-pioneer-11-launch...

 

Specifically:

 

www.nasa.gov/sites/default/files/thumbnails/image/ac79-91...

 

Finally:

 

www.fossilhunters.xyz/saturn-ring-system/encounters-with-...

Credit: Dennis Larson/"Fossil Hunters" blogsite

 

en.wikipedia.org/wiki/Epimetheus_(moon)

Credit: Wikipedia

 

solarsystem.nasa.gov/moons/saturn-moons/epimetheus/in-dep...

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Uploaded on April 27, 2021