디오네 : 토성의 빛을 받아 빛나는 디오네의 지표

Image Credit: NASA/JPL-Caltech/Space Science Institute

이 사진에는 Saturnshine이라 불리는 토성의 빛을 반사해내며 빛나고 있는 디오네의 지형이 담겨있다.

 

화상화를 담당하고 있는 과학자들은 이 사진을 만들어내기 위해, 그리고 빠르게 디오네를 통과하는 카시니호가 찍은 사진에 얼룩이 지는 것을 예방하기 위해  상대적으로 짧은 노출 시간(10밀리초)을 설정하였다.

이처럼 짧은 노출 시간에도 불구하고 토성의 빛은 디오네 야간 반구의 모습을 선명히 드러낼만큼 충분히 빛나고 있다.

 

이 사진은 2015년 8월 17일, 카시니 호가 디오네를 마지막으로 근접통과하는 동안 광각 카메라를 이용하여 촬영한 것이다.

 

사진을 촬영할 당시 디오네까지의 거리는 970킬로미터였으며 사진의 해상도는 픽셀당 58미터이다.

출처 : NASA 제트추진연구소(JPL, Jet Propulsion Laboratory) Photo Journal
         http://photojournal.jpl.nasa.gov/catalog/PIA19652

 

참고 : 토성과 다양한 토성의 달에 대한 각종 포스팅은 아래 링크를 통해 조회할 수 있습니다.   
           https://big-crunch.tistory.com/12346948        

 

원문>

PIA19652: Dione's Saturn-lit Surface

Original Caption Released with Image:

This view from NASA's Cassini spacecraft shows terrain on Saturn's moon Dione that is entirely lit by reflected light from Saturn, called Saturnshine.

Imaging scientists set a relatively short exposure time (10 milliseconds) for this and other views obtained during this fast flyby in order to avoid smearing the images. Despite the short exposure time, the light from Saturn was sufficient to provide a good look at features on the moon's night side.

The image was acquired in visible light with the Cassini spacecraft wide-angle camera during a close flyby of the icy moon on Aug. 17, 2015. The view was acquired at an altitude of approximately 600 miles (970 kilometers) above Dione and has an image scale of about 190 feet (58 meters) per pixel. North on Dione is toward lower left.

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.

For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov and http://www.nasa.gov/cassini. The Cassini imaging team homepage is at http://ciclops.org.

Image Credit: NASA/JPL-Caltech/Space Science Institute
Image Addition Date: 2015-08-20