{"id":484,"date":"2018-01-12T09:52:51","date_gmt":"2018-01-12T00:52:51","guid":{"rendered":"http:\/\/cassini.kyoto-svp.com\/?p=484"},"modified":"2018-04-14T11:25:43","modified_gmt":"2018-04-14T02:25:43","slug":"2018-01-12%ef%bc%9a%e5%9c%9f%e6%98%9f%e3%81%ae%e5%8d%b0%e8%b1%a1%e7%9a%84%e3%81%aa%e7%94%bb%e5%83%8f","status":"publish","type":"post","link":"https:\/\/cassini.kyoto-svp.com\/?p=484","title":{"rendered":"2018.01.12\uff1a\u571f\u661f\u306e\u5370\u8c61\u7684\u306a\u753b\u50cf"},"content":{"rendered":"

\u300c2018.01.10\uff1a\u300c\u30b9\u30d4\u30eb\u30ab\u30fc\u304c\u8a9e\u308b\u571f\u661f\u306e\u8b0e\u300d\u3067\u82f1\u8a9e\u30d2\u30a2\u30ea\u30f3\u30b0\u7279\u8a13\uff01<\/a>\u300d\u3067\u3082\u5f15\u7528\u3055\u308c\u3066\u3044\u305f\u571f\u661f\u306e\u753b\u50cf\u3067\u3059\u3002<\/span><\/p>\n

\u3053\u308c\u306f\u300cPIA17172: The Day the Earth Smiled<\/a>\u300d\u3068\u3044\u3046\u3082\u306e\u3067\u592a\u967d\u3092\u80cc\u306b\u3057\u305f\u571f\u661f\u3092\u53cd\u5bfe\u5074\u3067\u64ae\u5f71\u3057\u305f\u3082\u306e\u3067\u3059\u3002<\/span><\/p>\n

\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u753b\u50cf\u306f\u8d85\u9ad8\u89e3\u50cf\u5ea6\u3067\u5927\u304d\u306a\u3082\u306e\u306a\u306e\u3067\u4ee5\u4e0b\u306b\u63b2\u8f09\u3057\u307e\u3059\u3002<\/span><\/p>\n

PC\u306e\u58c1\u7d19\u306a\u3069\u306b\u3044\u304b\u304c\u3067\u3057\u3087\u3046\u304b\u3002<\/span><\/p>\n

A brightened version with contrast and color enhanced (Figure 1)<\/h3>\n

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\"\"<\/a>

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A version with just the planets annotated (Figure 2)<\/h3>\n

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\"\"<\/a>

\u753b\u50cf\u30af\u30ea\u30c3\u30af\u3067\u62e1\u5927\u8868\u793a\uff089000 \u00d7 3500\uff09\u3057\u307e\u3059<\/p><\/div>\n

An annotated version (Figure 3)<\/h3>\n

\u6ce8\u91c8\u4ed8\u304d\u30d0\u30fc\u30b8\u30e7\u30f3\uff08\u56f33\uff09<\/span><\/p>\n

\"\"<\/a>

\u753b\u50cf\u30af\u30ea\u30c3\u30af\u3067\u62e1\u5927\u8868\u793a\uff084500 \u00d7 1750\uff09\u3057\u307e\u3059<\/p><\/div>\n

PIA17172: The Day the Earth Smiled<\/h2>\n

With the sun’s powerful and potentially damaging rays eclipsed by Saturn itself, Cassini’s onboard cameras were able to take advantage of this unique viewing geometry. They acquired a panoramic mosaic of the Saturn system that allows scientists to see details in the rings and throughout the system as they are backlit by the sun. This mosaic is special as it marks the third time our home planet was imaged from the outer solar system; the second time it was imaged by Cassini from Saturn’s orbit; and the first time ever that inhabitants of Earth were made aware in advance that their photo would be taken from such a great distance.
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With both Cassini’s wide-angle and narrow-angle cameras aimed at Saturn, Cassini was able to capture 323 images in just over four hours. This final mosaic uses 141 of those wide-angle images. Images taken using the red, green and blue spectral filters of the wide-angle camera were combined and mosaicked together to create this natural-color view. A brightened version with contrast and color enhanced (Figure 1), a version with just the planets annotated (Figure 2), and an annotated version (Figure 3) are shown above.
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This image spans about 404,880 miles (651,591 kilometers) across.
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This view looks toward the unlit side of the rings from about 17 degrees below the ring plane. Cassini was approximately 746,000 miles (1.2 million kilometers) from Saturn when the images in this mosaic were taken. Image scale on Saturn is about 45 miles (72 kilometers) per pixel.
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This mosaic was made from pictures taken over a span of more than four hours while the planets, moons and stars were all moving relative to Cassini. Thus, due to spacecraft motion, these objects in the locations shown here were not in these specific places over the entire duration of the imaging campaign. Note also that Venus appears far from Earth, as does Mars, because they were on the opposite side of the sun from Earth.
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