Earth Rise” from the moon photographed




NASA has released a picture of the ‘rise’ of the Earth above the lunar horizon. The Lunar Reconnaissance Orbiter, or LRO took the picture, or rather photos. The LRO flew during the making of the picture 134km above the Compton-moon crater.

Making a snapshot of the earth is no sinecure with the LRO. The spacecraft must first tilt on its side, in this case at an angle of 67 degrees; thereafter, the LRO must rotate in the direction of flight in order to capture the moon horizon as wide as possible on the small sensitive plate of the camera angle of the vessel. All this while the device is traveling at 1600 meters per second or 5760 kilometers per hour compared to the lunar surface.

NASA earth moon The Earth, seen from above the Compton crater on the moon. Central to the earth 4,04ºN, 12,44ºW, just off the coast of Liberia. The photo sequence was started on October 12, 2015, 12: 18: 17 384 UTC Source: Arizona State University

The high resolution of the LRO camera has a lens with a small viewing angle and makes black and white photos. The camera with wide-angle lens makes color photos. For this data to be processed in a picture, some things had to be done, writes the Arizona State University on his LRO Camera-blog, where you can also find TIFF files with high resolution stills.

The black and white with the small angle camera is made only once. This picture has the high resolution. The wide-angle camera takes several pictures. The pixel scale of the small camera angle is 75 times smaller than that of the wide angle. By using different wide-angle shots, however, may be a sharp color version of the plate to be made. For each pixel wide, the earth was between twenty and fifty times in the picture put. The lunar surface looks as made with the small angle camera. The colors are approximate, because the spectrum perceives the wide-angle camera is a combination of the 604nm-, 556nm- and 415nm band, either orange, yellow-green and violet. This is converted into red, green and blue for a display that corresponds to the human perception.

Technically, the earth will never “stand up” when looking from the moon, because the moon with a fixed side is to the earth. If the earth to the moon is visible, it remains visible.


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