File:Earthrise over Compton crater -LRO full res.jpg

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Afrikaans: 'n Uitsig oor die oppervlak van die Maan met die Aarde teen die agtergrond, soos gesien vanaf die Lunar Reconnaissance Orbiter oor die Compton-krater op 12 Oktober 2015.
Français : Le desert du Sahara dans un lever de Terre par le Lunar Reconnaissance Orbiter.
Deutsch: Die Erde geht über dem Horizont des Mondes auf, aufgenommen vom Lunar Reconnaissance Orbiter 134 km über dem Compton-Mondkrater. Dem Betrachter zugewandt ist die Westküste Afrikas. Der sichtbare Teil des Mondes ist an der Tag-Nacht-Grenze, weshalb einige Berge sich noch vollständig im Schatten befinden und lediglich als Silhouette vor der Erde in Erscheinung treten.
English: The Earth straddling the limb of the Moon, as seen from Lunar Reconnaissance Orbiter above Compton crater. The shadow in the foreground is from the crater's central peaks, while the mountains just above it can be seen in the 10 o'clock position within the crater in this image or the 12 o'clock position in this image. The center of the Earth in this view is 4.04°N, 12.44°W, just off the coast of Liberia. The large tan area in the upper right is the Sahara desert, and just beyond is Saudia Arabia. The Atlantic and Pacific coasts of South America are visible to the left.

From the Earth, the daily Moonrise and Moonset are always inspiring moments. However, lunar astronauts will see something very different: viewed from the lunar surface, the Earth never rises or sets. Since the Moon is tidally locked, the Earth is always in the same spot above the horizon, varying only a small amount with the slight wobble of the Moon. The Earth may not move across the "sky", but the view is not static. Future astronauts will see the continents rotate in and out of view and the ever changing pattern of clouds will always catch one's eye. Well at least on the nearside, but what about the farside? The Earth is never visible from the farside, imagine a sky with no Earth or Moon - what will farside explorers think with no Earth overhead?

This image was taken when LRO was 134 km above the farside crater Compton (51.8°N, 124.1°E). Capturing an image of the Earth and Moon with LROC is a complicated task. First the spacecraft must be rolled to the side (in this case 67°), then the spacecraft slews with the direction of travel to maximize the width of the lunar horizon in the NAC image. All this takes place while LRO is traveling over 1600 meters per second (faster than 3580 mph) relative to the lunar surface below the spacecraft! As a result of these three motions and the fact that the Narrow Angle Camera is a line scanner the raw image geometry is distorted. Also, because the Moon and Earth are so far apart, the geometric correction is different for each body. Reconstruction of the Earth-Moon image is not a simple matter – and that is just to get the black and white image!

What about color? The WAC images the same scene repeatedly while the NAC scans across the scene just once. Since the NAC pixel scale is 75 times smaller than the WAC pixel scale, a straight Earth and Moon composite would show a very fuzzy Earth and a sharp Moon. The LROC team took advantage of the multiple WAC images of the Earth to create a sharpened WAC Earth. For each WAC pixel the Earth was imaged between 20 and 50 times (the WAC FOV moved only a small fraction of a pixel between each image), and these multiple looks were combined (for the Earth only, the Moon as shown is NAC). The colors are only approximately what an intrepid explorer would see from the Moon because the human eye is fully sensitive to all colors across the visible wavelength range, whereas the WAC sees through a set of narrow band filters (the view here combines the 604 nm (orange), 556 nm (yellow-green), and 415 nm (violet) bands displayed in red, green, and blue, respectively).

The Earth is much brighter (higher reflectance) than the Moon, especially from this angle; the Earth was captured near noon while the limb of the Moon was just appearing from the shadows of night, so the Moon was relatively dim. In the opening image the Moon and Earth were contrast-stretched separately to bring out details on the lunar surface. The two contrast stretch makes for a spectacular image, but it may be misleading in a purely scientific sense.

The sharp black outline across the bottom of the Earth is from mountains still on the night side of the lunar terminator.

A blog post by Emily Lakdawalla discusses the creation of this image.

The original NASA image was converted from TIFF to JPEG format by the uploader.
Español: Imagen de la Tierra captada por la sonda espacial Lunar Reconnaissance Orbiter al sobrevolar el cráter Compton en la cara oculta de la Luna en octubre de 2015.
Polski: Ziemia nad horyzontem Księżyca sfotografowana przez amerykańską sondę Lunar Reconnaissance Orbiter, która znajdowała się 134 km nad kraterem Compton. Środek Ziemi na tym widoku znajduje się na 4,04°N, 12,44°W, niedaleko wybrzeża Liberii. Ogromny, brązowy obszar u góry, po prawej stronie to SaharaArabią Saudyjską tuż obok. Natomiast po lewej stronie widoczne są atlantyckie oraz pacyficzne wybrzeża Ameryki Południowej.
Українська: Вид на Землю з зонду Lunar Reconnaissance Orbiter, на передньому плані — кратер Комптона на Місяці.
Čeština: Planeta Země pozorovaná přes obzor Měsíce americkou sondou Lunar Reconnaissance Orbiter nad kráterem Compton. Ve středu zemského kotouče leží pobřeží Libérie, výrazně barevně je odlišena plocha Saharské pouště.
Magyar: A Föld a Hold ölében, ahogy az a Lunar Reconnaissance Orbiterről a Compton-kráter fölött látszik. A földkorong középpontja ebben a nézetben északi szélesség 4,04 °, nyugati hosszúság 12,44 °, Libéria partjánál. A jobb felső részen a Szahara, mögötte Szaúd-Arábia, balra a jórészt felhőkkel takart Dél-Amerika
Italiano: La Terra sull'orizzonte della Luna, vista dal Lunar Reconnaissance Orbiter al di sopra del Cratere Compton. Il centro della terra in questa proiezione è 4.04°N, 12.44°W, subito al largo delle coste della Liberia. La grande area bruna nella parte superiore destra è il deserto del Sahara.
한국어: 의 가장자리에 올라앉은 지구콤프턴 크레이터 상공을 지나는 달 탐색 궤도선에서 바라본 모습. 그림에서 보이는 지구의 중앙은 북위 4.04°, 서경 12.44°로, 리베리아 해안에서 약간 떨어진 곳이다. 오른쪽 위로 햇볕에 탄 지역은 사하라 사막이며, 사우디 아라비아가 그 뒤에 위치한다. 남아메리카의 대서양과 태평양 해안선이 왼쪽으로 보인다.
Македонски: Земјата гледана од Вселенскиот извидувачки опкружувач (ЛРО) над кратерот Комптон на Месечината.
Nederlands: Op deze door de Lunar Reconnaissance Orbiter gemaakte foto komt de Aarde op boven de horizon van de Maan
Português: Imagem da Terra captada pela espaçonave robótica Lunar Reconnaissance Orbiter quando sobrevoava a cratera Compton, no lado oculto da Lua, em outubro de 2015.
Date
Source http://lroc.sese.asu.edu/posts/895
Author NASA / Goddard Space Flight Center / Arizona State University
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This image was selected as picture of the day on Bengali Wikipedia.
Picture of week on Czech Wikipedia
Čeština : Tento obrázek byl vybrán jako obrázek týdne na České Wikipedii pro 35. týden roku 2016.
Dansk: Dette billede har været valgt som ugens billede på den Tjekkiske Wikipedia i uge 35, 2016.
English: This image was selected as a picture of the week on the Czech Wikipedia for 35th week, 2016.
Français : Cette image est sélectionnée en tant qu’image de la semaine sur la Wikipédia Tchèque pour la 35e semaine de 2016.
Italiano : Questa immagine è stata selezionata come Immagine della settimana su Wikipedia in ceco per la XXXV settimana del 2016.
Magyar : Ezt a képet 2016 35. hetében a hét képének választották a cseh Wikipédián.
Svenska: Denna bild valdes som veckans bildtjeckiskspråkiga Wikipedia för vecka 35, 2016.
Македонски : Сликава е избрана за слика на неделата на чешката Википедија за XXXV недела од 2016 година.
Picture of the week on the Czech Wikipedia


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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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