The Moon

On this page, you will find a selection of some of my images of our Moon.

July 27th 2018 Total lunar eclipse

Total lunar eclipses are always very anticipated phenomena by the astronomers. But contrary to total solar eclipses that happen on a narrow path on the Earth, total lunar eclipse can be seen from more than half of the Earth. The total lunar eclipse of July 27th 2018 was of the rare type of central lunar eclipses, ie eclipses during which the Moon glides through the center of Earth’s shadow.

I was in Réunion island, in the Indian Ocean to observe the Eclipse. The Eclipsed Moon was accompanied by Mars located about 5° from the Moon. Mars was in a nearby opposition, shining brightly around magnitude -3. During the maximum part of the Eclipse, Mars seemed brighter than the Moon, which means the full moon’s light was dimmed by a factor probably larger than 5000 by the Earth shadow.

Below are different images that I have acquired during the eclipse. they have been taken with a 100mm diameter apochromatic refractor and Sony A7SII.

all_stages.pngHDR image showing different stages of the 2018 lunar eclipse (high res here). All the images have been processed together to have homogeneous and realistic rendering. One can see that the bluish rim of the Earth’s umbra, and the deep red color of the center of the umbra.

 

totality stars.pngThe beginning, maximum and end of the total phase of the lunar eclipse (high res here). 

 

partial + total.pngPartial and total phases of the lunar eclipse (high res here). 

 

max_TLE.pngDuring the 2018 lunar eclipse, the moon went directly through the center of Earth shadow (higher resolution here).

 

earth_shadow.pngComposite image showing the shape and color of Earth shadow (high res here). 

 

Below is a mosaic image composed of 5×3 panels, made with modded Sony A7S + Sigma Art 85mm f/1.4 lens, used at f/2.8, during the totality of the lunar eclipse. Making this mosaic was a real challenge due to the relatively short time available during the totality and the quite large number of panels.

TLE2018_websiteMosaic image of the Eclipsed Moon with Mars, the Milky way and its nebulaes. The Gegenshein is weakly visible as a glow located between Mars and the Moon. You can try to spot Helix Nebula and comet C/2018 N1 NEOWISE in the higher resolution image here. It was acquired with modded Sony A7S and Sigma Art 85mm f/1.4 used at f/2.8.

 

August 21st 2017: Sun-Eclipsing Moon

Total Solar Eclipse are not only the occasion to observe the sun corona, but also to observe the Earthshine of the Moon’s surface. In such circumstances, the Moon can have a higher elevation above the horizon, resulting in conditions that can be more favorable to see the details of the lunar surface than the usual Earthshine at dusk or dawn. Indeed, very small details on the moon were visible during the total solar eclipse, for instance on my recognize Rima Hyginus, the walls of Copernicus crater, Vallis Alpes, etc…

The pinkish color spots of color on the right hand side of the lunar limb are due to the the bright prominences that scattered around some of their colored light.

earthshine_okThe Earthshine (high res here) shows the well-known lunar details. It comes from solar light scattered by Earth clouds, ocean and land, dimly litting the Moon surface. The image was acquired with 100mm diameter apochromatic refractor and Sony A7RII

Color-Full Moon

The time of the full moon is generally considered to be uninteresting due to the lack of contrast and details on the lunar surface. However, it is a good time to try to catch other low contrast details, like the colors of the Moon.

This image of the Moon was created using similar algorithms to the ones of the solar eclipse, but applied to the colors of the moon. Unlike a simple saturation boost, the color boost applied is dependent on the scale of the details: for instance the boost of lunar mares is lower than the boost of craters in order to avoid large scale color feature to hide smaller scale color features. This allows to obtain an image showing more nuances of the color variations across the moon surface.

I was not expecting to me to see so many colors and details, and everywhere over the whole surface of the moon. Some craters have rim with a different color than their center!

The colors on the moon surface are linked to composition variations. Thus crater colors depends on both impactor composition and underneath lunar terrain composition. That explains why crater colors are not all the same. But more complex impact physics must play a role for the mixing of the impactor composition with the one of the lunar terrain to explain that some craters have several colors!

fullmoon12Color enhanced image of the full moon (high res here). This image has been shortlisted for the 2018 Astronomy Photographer of the year award. It was acquired with 100mm diameter apochromatic refractor and Sony A7SII.

 

closeupHigher contrast, full scale detail of the image (high res here). The lunar surface is really not gray but extremely rich in colors everywhere!

Earthshine

The Earthshine is the weak bluish glow on the dark side of the moon that is visible when the moon is a small crescent. It is caused by the blue Earth illuminating the moon. The huge contrast difference between the crescent and the dark side makes Earthshine pretty difficult to photograph, and to process to obtain a natural aspect. I spent some time on this image to obtain an appearance that rendered what one can see visually.

This image of the Earthshine is pretty well resolved, with small details like Vallis Alpes visible. It was acquired with a 100mm diameter apochromatic refractor and Sony A7SII.

earthshineThe Earthshine glow makes the whole moon surface visible at crescent phase (high res here). It was acquired with 100mm diameter apochromatic refractor and Sony A7SII.

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