Crater Langrenus - an LRGB image (Niall MacNeill)

Contains: Solar system body or event

Crater Langrenus - an LRGB image

Acquisition type: Lucky imaging

Crater Langrenus - an LRGB image

Acquisition type: Lucky imaging

With the new moon just 4 days old, I wanted to image the impressive crater Langrenus (132kms diameter). It must be imaged when the moon is quite new to have the crater in relief as you see it here, given it is on the eastern limb of the moon at the eastern edge of Mare Fecunditatis. The seeing was reasonably good and certainly better than for my previous capture of Crater Petavius.

I made 5 minute RGB and IR 642nm BP captures.

Most interestingly the IR image was the highest in quality, then the Red, Green and Blue in sequence. Previously I have seen the red image being of the highest quality when the seeing is better and this confirms that when the seeing is not as good, the IR images give better clarity due to their being less affected by the seeing.

After processing in the normal way, I did the RGB combination in Photoshop. It was nice to see the subtle colours of this lunar landscape, but I felt the inclusion of the IR capture as a Luminance image would be beneficial and it certainly has added definition, particularly to the disrupted northern part of the crater floor (bottom in this image which is south up).

The smaller crater immediately below Langrenus is crater Acosta (13kms). To its right are three beautiful craters: Atwood (top left 29kms), Bilharz (top right, 43kms) & Naonobu (bottom left, 35kms). The myriad of small craters around these three craters is reminiscent of shrapnel scars, although their elongation doesn't suggest they came from crater Langrenus.

I love the terraced walls of this crater and on the eastern wall (left) there looks to be a dark depression like a cave.

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Crater Langrenus - an LRGB image

Crater Langrenus - an LRGB image

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Crater Langrenus - an LRGB image

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