Waning Moon, 24th August 2019

Another clear night, another moonshot…

Pleased with this one. Copernicus seems to have come out well and there are plenty of hints of high peaks beyond the terminator. Lack of sleep means I can’t recall the exact circumstances at the time of imaging, however 😀 It would have been in the small hours of Friday morning, I think pretty much the last thing I did before stopping for the night.

40 of 100 frames of 1/500th @ ISO800, Canon 450D and 127Mak. Preprocessed with PIPP, stacked in AS!3, wavelets in Registax 6 and final tweaking in PS.

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Swimming, 23rd August 2019

Last swim of the week, and a new target time:

  • 400m f/c warm-up
  • 24 x 50m f/c, target time 49s, turnaround 75s
  • 200m swim down

I first failed on rep sixteen for this set, and finished with one additional failure. Hopefully next time will be better. My “fast fifty” was a mere 0.06s slower than yesterday, so I’m not unhappy with that.

USRPT distance this year: 172,900m
Total distance this year: 221,100m

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Waning Moon, 23rd August 2019

I’m such a martyr, I really am 😀

It was mostly cloudy last night so I’d abandoned all hope of imaging and got into some development work on oacapture/oalive. Time passed quickly, as it does, and before I knew it 2am had arrived. As I walked through the house to go upstairs to bed I looked out of the window and could see the sky clearing and the Moon in view. So, quick change into warmer clothes, open up the observatory, wait for the cloud to clear properly and get imaging. What else?

I did get caught by a bit more cloud halfway through the run, but that soon cleared and I had another go.

For processing I took the best 100 frames of 1/500th at ISO800 as ranked by PIPP, stacked them in AS!3 (which seems to have done something strange to the framing), used wavelets in Registax 6 and had a final tinker in PS.

I quite like the way the peaks of the Appenines show up way beyond the terminator, and the nice line of large craters along the terminator to the south.

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Swimming, 22 August 2019

Same session with the 49.5s target time today, and I made all the reps comfortably, so next time the target drops to 49s.

But… Big news of the day was doing another “fast fifty” at 39.17s! Frankly I’m astonished to have dropped so much time in one go. It suggests that more really ought to be possible.

USRPT distance this year: 171,100m
Total distance this year: 219,300m

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Waning Moon, 21st August 2019

Three nights on the bounce! But this one was a bit of an adventure. What was foreast as a few of hours of clear sky after the Moon rose stopped about two minutes after I kicked off the run to collect my subs at 1:15am and I ended up with about thirty that were ok and many more that were varying shades of dark. I decided to hang around for a while on the off-chance I might get another go and just before 2am clear sky reappeared, allowing me to complete another run. In the end I had 135 passable subs and threw away 65 without even considering processing them.

1/500th subs at ISO800, preprocessed with PIPP, stacked in AS!3, wavelets in Registax 6 and finished off with PS.

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Swimming, 20th August 2019

A repeat of yesterday’s session, but today I made all the reps. One more time and I’ll drop the target time again. No “fast fifty” at the end today though.

USRPT distance this year: 169,300m
Total distance this year: 217,500m

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Waning Moon, 20th August 2019

Two nights in a row clear enough to get an image of the Moon! Best 45 of 100 frames from the 450D and 127 Mak again, but this time 1/500th sec exposure to try to reduce the effects of wobbly seeing, and I had to bump the ISO setting up to 800 as a result. Preprocessed with PIPP, then stacked in AS!3, wavelets in Registax 6 and a final bit of fiddling about and conversion to PNG in PS.

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Swimming, 19th August 2019

The pool has cooled a little now, so I have decided to go back to proper USRPT sessions, with a target time of 49.5 seconds:

  • 400m f/c warm-up
  • 24 x 50m f/c, target time 49.5s, turnaround 75s
  • 200m swim down

Unfortunately I had a couple of fails, demonstrating my lack of practice, but it’s good to be back on the horse again.

I also did a “fast fifty” at the end of the set, with the stopwatch reading 40.36 when I hit the wall. I guess I can’t get faster every time 🙂

USRPT distance this year: 167,500m
Total distance this year: 215,700m

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Waning Moon, 19th August 2019

So, a newly-aligned mount and just past full Moon, what’s a chap to do? Well, when the sky gives you moons, make moon images!

I broke out the 127 Mak and 450D and dropped them on top of the HEQ5. It doesn’t really know where the Moon is yet because I don’t have a sufficiently good sky model, but with a little nudging I was on-target and the tracking was certainly ok.

I captured 100 frames of 1/200th at ISO200 for this image, and then had a devil of a job getting them to stack in Registax (after preprocessing with PIPP), which kept locking up during stacking. I gave up and tried stackistry. Whilst that did a mostly good job, it fouled up the limb. AutoStakkert!3 came to my rescue and gave me a stacked image that I pulled into Registax for wavelets and then finished off in Photoshop.

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Telescope Polar Alignment, Part Three — The Return of PHD2

As mentioned in an earlier post, the last mount in my observatory cannot be polar aligned directly as it has no view of the celestial pole. After giving things a bit of time I decided I’d just have to bite the bullet and return to drift aligning using PHD2. This time however, though I’m sure it makes little difference, I used PHD2 on the same Linux laptop I’d already used to align the other two mounts.

The process is identical to that in the Windows version, but I think having had a bit of practice with the easier plate-solving alignment system in Ekos, I felt a bit more confident about what I was doing. I used Kstars to pick alignment targets as close to the “ideal” positions as possible and this time I really didn’t struggle that much with the adjustments. The azimuth adjustment was actually relatively straightforward and whilst the adjusters again make the alt adjustment more tricky, after three or four iterations I still got to within about one arcminute of the pole. The obvious thing to take from this would seem to be that “practice counts”.

I do now feel quite happy with the idea of taking the HEQ5 on holiday, say, and setting it up from scratch using either method. I think that’s a good step forward.

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