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A-L-E-X
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Asteroids, meteors, and meteorites

13 Dec 2020 00:23

https://www.dpreview.com/forums/post/64629918

Wow he got such an amazing Orion Nebula image with a Canon superzoom camera that can't do longer than 15 sec exposures at ISO 100.  He uses the same DSS freeware for stacking that I have, but the one difference is key, he has a tracking mount and I dont have that.  Cant even see Polaris here to do an alignment.  He did 41 frames 15 sec each at ISO 100.  I wonder if I can do 246 frames at 2.5 sec each at ISO 100....but since I have a M43 camera, I can actually use much higher ISO to achieve a similar result too....and I dont even have to use ISO 3200 like in my image!  I could do 31 frames at 2.5 sec each at ISO 800....or I could do 24 images at 2.5 sec each and ISO 3200 and let the stacking take care of the noise (but would nebular colors be blown out at that exposure level and high ISO?)  He said it's 184mm, is that EFL? If so mine is 150mm EFL. I dont think his can be actual focal length because that would be around 1000mm EFL which would nearly fill the frame with the Orion Nebula I think?
 
A-L-E-X
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Astrophotography

14 Dec 2020 04:20

I used DSS to stack 24 images (set to 80% best so it actually stacked 19) and according to the program at a 2% threshold it detected 6000 stars.  I didn't actually see 6000 stars though.  What I did see was only slightly more stars than each subframe and the nebulosity looked the same, the big improvement was an improvement in the SNR, the noise floor of the background sky was much much lower and looked silk smooth especially at ISO 3200.  But I'm disappointed that it didn't show a lot more stars or more of the nebulosity, especially since it's a 48 sec total exposure as opposed to each sub only being 2.5 sec....whats going on here?  Not going to post a 154 MB TIF file either lol.
 
vlad01
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Astrophotography

15 Dec 2020 01:35

First pic of the horse head nebula my friend and I took, only managed 2 exposures before clouds ruined the night.

Also yet to try stack the ones of M33


horse head.jpg
 
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midtskogen
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21 Dec 2020 07:42

Anyone getting a photo of Jupiter and Saturn tonight?  Fog and clouds here, and they're soon setting. :(
NIL DIFFICILE VOLENTI
 
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Watsisname
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Astrophotography

21 Dec 2020 16:21

midtskogen wrote:
Source of the post Anyone getting a photo of Jupiter and Saturn tonight?  Fog and clouds here, and they're soon setting.

No luck here, either. Have not had a clear sky all December, and now it's snowing.
 
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FastFourierTransform
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Astrophotography

22 Dec 2020 02:03

Watsisname wrote:
Source of the post No luck here, either. Have not had a clear sky all December, and now it's snowing.

Spain has also been covered in clouds all the week :(
Image
 
A-L-E-X
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Astrophotography

22 Dec 2020 08:04

It was cloudy here last night but tonight should be clear so I'm stoked!  I have heard that the best time to look is 45 min after sunset in the SW sky, but I hope it's not too close to the horizon because we have some tall buildings here!  In degrees, how far above the horizon will they be?

I also saw this post and wonder if it's true?

 Personally, I'm looking forward to the 'great conjunction', when Jupiter will pass directly in front of Saturn.  That will occur next on February 16, 7541 (seriously.)  I'm hoping that if I diet and exercise I can be around to see it happen.  By the way, if you're busy that day or if it is cloudy (does Accuweather's long range go out this far?), it happens again later that year on June 17th, 7541.

my response to that was this:

I didn't even know that could actually happen lol.  I'd settle for a nice lunar occultation of either Jupiter or Saturn or both in the same night ;-)

Do you have any numbers for when that might happen next?
 
A-L-E-X
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Astrophotography

22 Dec 2020 08:06

Watsisname wrote:
midtskogen wrote:
Source of the post Anyone getting a photo of Jupiter and Saturn tonight?  Fog and clouds here, and they're soon setting.

No luck here, either. Have not had a clear sky all December, and now it's snowing.

and this is one reason why we need climate engineering pronto.  For spectacular events like this (and for other reasons.)  We can develop a vaccine to a pandemic within a year and we can't suck some clouds out of the skies? lol
 
A-L-E-X
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Astrophotography

22 Dec 2020 09:29

There's a Venus–Jupiter mutual occultation coming up relatively soon... 2060s I think? But it's only going to be a few degrees from the sun and so either invisible or extremely difficult to see. A re-enactment of what happened in 2 BC?
 
vlad01
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Astrophotography

22 Dec 2020 18:30

midtskogen wrote:
Anyone getting a photo of Jupiter and Saturn tonight?  Fog and clouds here, and they're soon setting. :(

We having the best place to see it here in Australia... clouds
 
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midtskogen
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23 Dec 2020 00:56

A-L-E-X wrote:
Source of the post There's a Venus–Jupiter mutual occultation coming up relatively soon... 2060s I think?

22 November 2065, last one was in 1818.  Wikipedia.
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A-L-E-X
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Astrophotography

24 Dec 2020 23:22

Thanks!  I stacked some images of M42 and was wondering which was the best acceptable star trailing image (star trailing = 7 pixels or less) from these untracked stacks at 75mm using 4:3 (150mm EFL).  The first is 2.5 sec the second is 3.2 sec and the third one is 4 sec.  The fourth is 2 sec (but a different FOV) and the fifth one is 2.5 sec but processed slightly differently.

Autosave005x.jpg
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Autosave011x.jpg
Autosave011x.jpg (43.78 KiB) Viewed 1024 times

Autosave018x.jpg
Autosave018x.jpg (42.81 KiB) Viewed 1024 times

Autosave030x.jpg
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Autosave007x.jpg
Autosave007x.jpg (48.26 KiB) Viewed 1024 times
 
A-L-E-X
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Astrophotography

29 Dec 2020 22:43

Now I'm using different processing software which enhances stars a lot better.  It's called Sequator and it also processes the pictures a lot more quickly.  I think the 3.2 sec version came out the best what do you all think?

I posted them on an excellent astrophotography site called astrobin which also does astrometry and plate solving.

https://www.astrobin.com/full/vj01zt/0/?real=&mod=

3.2 sec version

https://www.astrobin.com/full/tsya6o/0/?real=&mod=

2.5 sec version

https://www.astrobin.com/full/5b81b4/0/?real=&mod=

4 sec version

https://www.astrobin.com/full/t6n9ez/0/?real=&mod=

2 sec version

So I looked for detail and number of stars close to the Orion Nebula and I found that the 3.2 sec version brought out the most stars.  The 2 sec version doesn't have M42 in the frame but I used stars below it to make the comparison.
 
A-L-E-X
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Astrophotography

29 Dec 2020 23:19

Alright one more set of four since someone just commented that they thought the JPG to JPG versions were better than the JPG to TIF versions.  So I'll post links to all four shutter speeds from that set also:

https://www.astrobin.com/full/73qqe2/0/?real=&mod=

2.5 sec

https://www.astrobin.com/full/s5l60i/0/?real=&mod=

3.2 sec

https://www.astrobin.com/full/sw9jcl/0/?real=&mod=

4 sec

https://www.astrobin.com/full/34pdgg/0/?real=&mod=
 
vlad01
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Astrophotography

30 Dec 2020 16:12

My friend just bought a ZWO ASI2600 colour camera and a ZWO advanced auto focuser. 

Should arrive next week.  We are going to have a bit of a learning curve to work out how to use it with Nina.

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