Posts Made By: Stefan Lammel

Hi all,

Here's an image from January taken in good seeing. The lighting was just about ideal for the ridges on the eastern part of Mare Humorum and the many intriguing rilles in the area.

http://www.pbase.com/image/115613331/original (x0.9)
http://www.pbase.com/image/115582547/original (x1.3)

10in f4.8 Newtonian, Infinity 2-1M, 5x Powermate, green filter, Avistack, Registax v.5, PSE5, Focus Magic, mosaic of 2 images

Regards,
Stefan

Hi all,

Another late arrival, this one is from last October when the seeing was fairly good. It's looking like there could be an unlisted dome to the south east of Geminus G (Rukl 16, long 49.39° E lat 30.34° N). There was a bit of a time difference between the two AVIs that make up the mosaic so the lower section needed rotating to match up.

http://www.pbase.com/slammel/image/115961180/original (x1.1)
http://www.pbase.com/slammel/image/115960763/original (x1.3)

possible dome - http://www.pbase.com/slammel/image/115998537

I thought it might be interesting to show the librations from the 2 AVIs (1 hr 42 mins apart) with an animated GIF http://www.pbase.com/image/115999010/original (aligned at the center). I didn't expect the difference in libration to be quite so obvious but it just shows that when it is mid-wobble it can shift quite a bit. There's a slightly odd looking (but logical) visual effect where one of the shadow tips stays put (due to the libration and shadow lengthening effects being equal) and the the peak (right side of image half way up) creating the shadow moves to the left.

10in f4.8 Newtonian, Infinity 2-1M, 4x Powermate, green filter, Avistack, Registax v.5, PSE5, Focus Magic, 2 image mosaic.

Regards,
Stefan

Hi all,

Here is a recent image taken in the early hours of Wednesday, August 12th.

It was about half an hour after dawn and I was reluctantly about to pack up, the
seeing was still good but I'd just used up all the available disk space on my
laptop (my external disk had packed up a few days earlier). So I thought I would
take one last look at the part of the terminator that I had so far ignored, then
I saw this view and I knew I had to catch it whatever it took! But how?
Eventually it dawned on me I could try recording to the 1GB flash card from my
camera and fortunately it worked, it was only 8 fps rate but I was so relieved!

It was a great moment as I saw this scene coming into view. I was scanning just
above where I had started that morning and there it was, the Hadley Rille
perfectly placed in the top left corner and the peaks of the Haemus mountains
catching the evening sun in a diagonal to the bottom right. Everything I knew of
that I would want to catch in this lighting was there... the Conon Rille, Ina,
the 'Pi' symbol (whatever it's called!), the domes (I think). The dramatic
lighting here was new to me and despite the daylight recording and high gain I
am really pleased with the way it has turned out, especially the portrait view.
I was only able to refill the card once more then the seeing went.

I don't know if this has been discussed before but I see a pattern in the flow
of ejecta from the Imbrium impact beyond the Apennines. It's great to see this
splurge of debris, I'm not sure I had fully recognized this one overlapping the
more obvious one below it before, it looks so fresh as if it's been captured mid
flow. I wonder if this is a recognized type of flow pattern where you get these
separate flow fingers splaying out from the main thrust, perhaps seen in
avalanches or mud or rock slides on Earth? Why did it splay out unlike the other
one? Something to do with flow dynamics and the comparative speed? Or maybe a
secondary impact during the flow, but the fingers further back would not fit
with that. So perhaps a stream of debris (similar to that which caused the
Copernicus secondary crater chains) landing on top would do it, perhaps even
explain the deep crevice along the center of the flow and the slightly S curved
shape?

Pure speculation of course but it just invites so many questions! :S

http://www.pbase.com/slammel/image/116182186/original x1.2 West up
http://www.pbase.com/slammel/image/116182182/original 0.9x North up

http://www.pbase.com/slammel/image/116256120/original Imbrium ejecta flows
http://www.pbase.com/slammel/image/116256122/original ejecta flow pattern


10in f4.8 Newtonian, Infinity 2-1M, 5x Powermate, green filter, Avistack, Registax v.5, PSE5, Focus Magic


Regards,
Stefan

Hi all,

This one is from the early hours of 12th August when the seeing was quite good
and fairly consistent for the 3 AVIs in this mosaic. The libration was
particularly favorable for Bailly and the two craters Drygalski and Hausen on
the limb.

This is the first image that I have done with the occasional help of reading
glasses, which has made me realize that the enlargements that I have been so
fond of may well be pretty pointless for people with better close up vision! I
like the way the x0.9 version has turned out due to the extra sharpening that
the size reduction allowed.

The image below is a heavily jpeg'd version of the x0.9, the linked images are
much clearer -

http://www.pbase.com/slammel/image/116915200/original x1.1
http://www.pbase.com/slammel/image/116916592/original x0.9
http://www.pbase.com/slammel/image/116916531/original x1.3


10in f4.8 Newtonian, Infinity 2-1M, 5x Powermate, green filter, Avistack,
Registax v.5, PSE5, Focus Magic, 3 image mosaic

exposure 26 ms, gain 5.5-6.7, 100-200/2500 frames

Regards,
Stefan

Hi all,

It's been a while but at last I have something to post. This mosaic is from 12-Aug-09 02:35-03:25UT and comprises 7 sections so it's a bit of a monster. I think I've spent more time on this than I can remember spending on almost any other image! There were a lot of ringing artifacts to deal with in the shadows, after a while even the slightest sign of ringing seemed to stand out like a sore thumb! The seeing was fairly good but a little inconsistent so the resolution varies a bit between the sections.

http://www.pbase.com/slammel/image/121154441/original 110% resize, north up
http://www.pbase.com/slammel/image/121779991/original 60%, down lit, west up
http://www.pbase.com/slammel/image/121780341/original 90%, south up

Apart from the down lighting which I always think works well visually along the central regions (maybe not so much towards the poles) there's something about reducing the size and condensing the detail in the smallest version that seems to look more 'realistic' somehow, at least to my eyes.

10in f4.8 Newtonian, Infinity 2-1M, 5x Powermate, green filter, 150/3000 frames per image, 7 image mosaic processed with Avistack, Registax v.5, PSE5, Focus Magic

Regards,
Stefan

Hi all,

Here is one from some old data from 2008. At the time I struggled with the processing due to the low illumination and rather high gain (10.2
in Lucam Recorder) and eventually gave up on several AVIs. Fortunately this time around the processing went ok and so now I have an
image - better late than never I suppose! (the image below is resized to x0.8)

http://www.pbase.com/slammel/image/121118070/original x1.2

http://www.pbase.com/slammel/image/121118139/original x0.9

10in f4.8 Newtonian, Infinity 2-1M, 5x Powermate, green filter, Lucam Recorder, 300/2500, Avistack, Registax, PSE5, Focus Magic

Regards,
Stefan

Hi All,

Here is another mosaic from 12th August '09, a bit further in from the terminator this time.

http://www.pbase.com/slammel/image/122040536/original x0.9

http://www.pbase.com/slammel/image/122040535/original x0.7

http://www.pbase.com/slammel/image/122087423/original x0.9 downlit crop of Ptolemaeus, Alphonsus & Arzachel


10in f4.8 Newtonian, Infinity 2-1M, 5x Powermate, green filter, 150/3000, Avistack, Registax, PSE5, Focus Magic

Regards,
Stefan

Hi all,

Here's one from last Sunday 21st, a rare clear night. The seeing was just about ok while I grabbed this...

http://www.pbase.com/slammel/image/123016010/original

(the version below is x0.8.)

10in f4.8 Newtonian, Infinity 2-1M, 5x PowerMate, green filter, 400/1600, Avistack, Registax, PSE 5, Focus Magic

Regards,
Stefan

Hi all,

Here are a couple of images from 23rd April. The seeing started off nicely but became more variable.
I am still getting used to how things look on a new lcd display (finally ditched the venerable CRT!)
so hopefully they aren't too far off!

Plato and the Alpes
http://www.pbase.com/slammel/image/124021048/original reduced size
http://www.pbase.com/slammel/image/124023906/original x1.1

Copernicus
http://www.pbase.com/slammel/image/124026038/original x1.2
http://www.pbase.com/slammel/image/124026094/original x0.9

I had a problem with the laptop which restricted capture to around 8fps, so as the seeing looked to
be quite good I thought I could get away with capturing just 1500 frames per AVI but now I am not so
convinced. I think most of them could have benefited from the usual 2500+ frames, I suspect the
difference would probably be slight but worthwhile. It could also be that the blue filter I was
using was not such a good idea after all, I had a theory that even if the seeing was not great a
blue could be used but maybe this is the result, hard to tell. So maybe back to the green as a
default next time. Anyway, enough excuses! ;o)

10in f4.8 Newtonian, Infinity 2-1M, 5x Powermate, Baader blue filter, 150/1500 frames, Avistack,
Registax v.5, PSE5, Focus Magic

Regards,
Stefan

Here's another from 23rd April, the libration was good for the north. It's about time I got a decent shot of the North Pole, the south usually gets all the attention!

http://www.pbase.com/slammel/image/124098965/original x0.85
http://www.pbase.com/slammel/image/124098706/original x1.1

10in f4.8 Newtonian, Infinity 2-1M, 5x Powermate, Baader blue filter, 150/1500-1900 frames, Avistack, Registax v.5, PSE5, Focus Magic, 3 image mosaic

Regards,
Stefan