Wednesday, April 17, 2024

Aurora Borealis

This is not exactly astronomical, but then it's still a result of extra-terrestial stream of high energy particles.  This is probably the first time I captured some but it's not visible in the light polluted front yard.

It's only taken handheld from my home with a mobile phone. 



It was just before I sleep, otherwise, it should worth a short travel to darker site.



Tuesday, April 16, 2024

20240415 Sun

Very windy, again on the new pier.  Faster setup time, and the pier is very stable! 


Taken with the 1.6x Baader barlows, poorly mosaic of four frames from 1632 to 1637 (UT+1), cloud  moving quickly making mosaic very difficult, more like testing the setup.


Friday, April 12, 2024

20240411 New fixed pier, new Ranger tube rings and the Baader Q Barlows

Prominence only, merged by two frames, not stitched perfectly so it was made dimmer to hide the artifacts, 0948 and 0949 (UT+1)



Next up is the close up of the active regions

0954 (UT+1)


0955 (UT+1)


All taken with ASI 462mm with the Baader 1.6x Q barlows and here is my new setup:

The pier is fixed on the floor, the mount is removable and stored inside the house.

Wednesday, March 27, 2024

20240322 12P Comet

 



Less than perfect sky, captured a few short exposures, probably below 10s each, stacked together to form the above before the comet sinked below neighbour's roof.  Just a record.

Canon FD 300mm f2.8L DIY modified to fit on my Canon 70D, tracked but unguided.

Saturday, March 16, 2024

20240316 Sun by ASI 462mm

New monochromatic camera arrived, much faster frame rate and slightly cleaner images.

Seeing 6/10, transparency 6/10.

Full disc at 1023 (GMT), reducer still required for full disc:


Insert 2x barlows, oversampling.


10:26 (GMT)


10:27 (GMT)


Quite delicate detail, love the quality of frames produced.


10:30 (GMT), I have confident that it should be a closed loop but the dynamic range is not enough to show the darker part, maybe I shall take another shot with longer exposure to form a HDR image?



Tuesday, January 16, 2024

20240116 ASI 662MC

The new baby arrived, gonna test it despite the poor sky condition, I would say seeing 3/10 with transparency 5/10.

I am adjusting myself on the transparency rating, and if I were still in Hong Kong, I would say it's 6//10 and if I were to compare with the previous clear nights, I would say it's more like 3-4/10, even Orion was not too visible to the naked eyes.

With the strong tripod, the mount was steady enough for the Meade 8" SCT.  Focusing was tricky anyway, the mirror shift worsen the problem further but that was doable with patience.  Patience is cool weather came with a price, especially when you couldn't use the glove.

Anyway, here were the results.  First up were prime focus shots on the moon, given the pixel size of 2.9um, the optimal sampling would be like f/14.5 so f/10 is a bit under sampled.




Next up was the Jupiter, I've to adjust my Rigel Quik Finder in order to point at the Jupiter properly, the flip mirror did help but still requires some effort.  Adding a 2x barlows means oversampling.

First up is a f/10 shot, but with the flip mirror, I expect it works longer than f/10.


The Jovian satellites were smeared by the wind current.  Pushing up with a 2x barlows did not reveal any more detail but worsen actually.




I will try to attach the barlows lens cell to different locations of the optical chain to find an optimal one when weather permits again.


Monday, January 15, 2024

20240114 M45

 


Transparency dropped, cloud rolled in before getting more signal, yet another test shot, no dark no flat.