Tuesday, August 29, 2017

4k wallpaper - Partial Moon

Want some high resolution moon wallpaper? This image is free for noncommercial use.

This picture is a composite from video, taken with a 127SLT and ZWO ASI290MC taken at prime focus. The video was composited with Microsoft's Image Composite Editor (ICE), edited in Gimp to place it on a black background of the right proportions, sharpened with Registax Wavelets, and level adjusted in Gimp.

Download the full resolution image from my Dropbox. In the upper right corner, you'll find a button with two dots. Click it and a dropdown box will open - an option there will let you download the full resolution file.

If you want a similar shot with a fuller moon, I have one here. I personally prefer this one, since it shows features in 3D a bit better due to the more oblique lighting.

Lunar 100 Target 4: Apennine Mountain Range

Image Details: 127SLT w/ 1.5x Barlow and ASI290MC, stacked from one minute of video

Somewhere around 3.75 billion years ago, during the Late Heavy Bombardment, a large asteroid or protoplanet hit the northern hemisphere of the moon. The impact caused an enormous impact crater known as the Imbrium Basin, bordered by high steep walls of rock.

Later lava partially filled in the basin, and hardened to a smooth dark surface known as Mare Imbrium (sea of showers). The Mare Imbrium The Apennine mountains are part of the remainder of the high crater edges. Even though partially buried by lava, the highest peaks are 5 km / 3.1 m high.

The mountain range is about 600 km / 370 m long. It is easily visible with binoculars and is a pretty stunning sight when the terminator line is near it, bringing the 3 dimensional structure into view.

The Apollo 15 mission landed here - the position is marked on the photograph.

Lunar 100 Target 2: Earthshine

Photo Details: 127SLT with SLR at prime focus, stacked from video

Shortly after sunrise or before sunset, when the moon is just a bright sliver, you can sometimes see the dark portion illuminated with a soft, dim glow. To photograph it you have to overexpose the lit portion, resulting in the loss of most detail there.

This dim light is sunlight that has first been reflected from the lit portion of the day side of earth, bounced of the part of the near side of the moon that is not directly lit, and then back down to your retina or camera. Cool, huh?

This diagram from Wikipedia demonstrates the concept very well.