Astrophotography – solar system

Lunar data mining and “Alexander’s beaded rim”

October’s “Sky at Night” magazine has quite a few lunar images. The regular “Moonwatch” article is about the crater “Alexander” and its environs. Alexander is a difficult to identify eroded crater. In particular it talks about “Alexander’s beaded rim” about which it says “The peaks that define Alexander’s western rim appear like tiny stars arranged in a beautiful arc”. I have to confess that from the images in the magazine, this clair-obscur effect totally eluded me.

So, as I now have quite an extensive set of window-sill based images (of varying quality!) of the Moon in a variety of phases a bit of data mining was indicated. I found the following image which I cropped and labelled the features to be approximately the same as that in the magazine;

Then, after a bit of contrast stretching in GIMP, we get this:

NOW I can see an effect, although whether it is the one they were talking about, I don’t know! It is pretty though.

While looking at this image set, nearby there was also a pretty good manifestation of the Lunar “V”.

Another attempt at Mons Rumker 11/09/2019

I have been trying for a long time to get a reasonable image of Mons Rumker to add to my lunar dome images. See https://roslistonastronomy.uk/more-lunar-dome-spotting-from-the-window-sill-25-07-2018

Rumker, being so close to the limb, is very tricky to get the terminator lighting and libration state right. Here is another go tonight. Slightly better than the last effort above, I fancy, but still not wonderful.

 

 

Planets – Voyager Grand Tour and More on 7 September

Spent last night using the ASI120MC with and without an x3 barlow on my 150PL. Who says it’s easy to find things with GOTO?

Neptune and Phi Aquari, the evening before they would have been much closer!
Neptune and Phi Aquari, the evening before they would have been much closer!
Uranus with x3 drizzle to reveal minute detail (not).
Uranus with x3 drizzle to reveal minute detail (not).
Surprisingly good Saturn for only a hundred and sixty or so frames.
Surprisingly good Saturn for only a hundred and sixty or so frames.
Soft Jupiter in bad seeing
Soft Jupiter in bad seeing
Pluto the tiny dot on the tiny arrow...
Pluto the tiny dot on the tiny arrow…
Appolo 17 landing site - Hadley rille is JUST visible - I managed amuch better image of this a few years ago, but with much better conditions.
Appolo 17 landing site – Hadley rille is JUST visible – I managed amuch better image of this a few years ago, but with much better conditions.

Re-processing Moon image in Registax

Roger has very kindly reprocessed my recent Moon image in Registax for me.

He comments: “I actually usually find “wavelets” in Registax more useful for sharpening, at least initially.”

QHY10 camera, Sky Watcher Equinox Pro 80mm OTA, TS OAG/flip mirror, Lichfield, August 2019, Andrew Thornett/extra processing by Roger Samworth.

Andy

This post follows on from my previous post:

Applying Lucy-Richardson sharpening in GIMP to my previous Moon image

My original Moon image:

Roger’s reprocessed image in Registax:

Settings Roger used on Registax:

Applying Lucy-Richardson sharpening in GIMP to my previous Moon image

Had a go at applying small amount of Lucy-Richardson sharpening in GIMP (in G’Mic plug-in) to my previous lunar image – let me know if you think it is an improvement or not…..

[How to find this filter: After installing G’Mic plug-in into GIMP, click on “Filters” in GIMP. GMIC should appear at the bottom of the drop-down list. Click on that.]

Andy

First images: Jupiter and Saturn

Prime focus with Canon 60D attached to SW200p last night when Saturn was at culmination (15 degrees) but still low enough to give a blurry image. My first photo of this planet. Jupiter was even lower but with iso800 the 4 Galilaen moons show up well but planet massively overexposed. The nearby full Moon also reduced the contrast. Attempted eyepiece projection but gave up trying to get the fast moving image in the camera lcd. Have an HEQ5 Pro for collection from RVO on Monday which should help track images and eventually get photos of some faint DSO’s. Thanks to Andy T for the demo of his HEQ5.