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How to Diagnose Trailed Stars

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#1 Jerry Lodriguss

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Posted 23 October 2017 - 01:38 PM

I’ve just posted a fairly long article on Diagnosing Trailed Stars on my web site.

 

http://www.astropix....iled_Stars.html

 

Click on the link to see the article.

 

Trailed, or elongated stars in long-exposure astrophotographs are something that every astrophotographer runs into sooner or later. Usually sooner!

 

I’ve got a lot of tips here to help you diagnose and solve problems with trailed stars.

 

Let me know what you think!

 

Jerry

 

Trails_09.jpg



#2 DavM

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Posted 23 October 2017 - 03:29 PM

Great write up! Many thanks Jerry.

Regards Dave



#3 NorthField

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Posted 23 October 2017 - 03:37 PM

Good stuff Jerry!! fun and informative read

 

( my biggest causes are: #1 Aliens #2 Earthquakes #3 the dog ate my roundness )



#4 Jerry Lodriguss

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Posted 23 October 2017 - 06:54 PM

Great write up! Many thanks Jerry.

Regards Dave

Thanks Dave!

 

Jerry



#5 Jerry Lodriguss

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Posted 23 October 2017 - 06:54 PM

Good stuff Jerry!! fun and informative read

 

( my biggest causes are: #1 Aliens #2 Earthquakes #3 the dog ate my roundness )

I should add your number three, that's hilarious!

 

Jerry



#6 calypsob

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Posted 24 October 2017 - 12:58 AM

I’ve just posted a fairly long article on Diagnosing Trailed Stars on my web site.

 

http://www.astropix....iled_Stars.html

 

Click on the link to see the article.

 

Trailed, or elongated stars in long-exposure astrophotographs are something that every astrophotographer runs into sooner or later. Usually sooner!

 

I’ve got a lot of tips here to help you diagnose and solve problems with trailed stars.

 

Let me know what you think!

 

Jerry

 

attachicon.gifTrails_09.jpg

Good stuff Jerry, I wish I had known about how to diagnose polar drift a long time ago.  It took a while to get that figured out. Im sure that future green AP'ers will really benefit from your insight! 



#7 Jerry Lodriguss

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Posted 24 October 2017 - 03:50 PM

 

I’ve just posted a fairly long article on Diagnosing Trailed Stars on my web site.

 

http://www.astropix....iled_Stars.html

 

Click on the link to see the article.

 

Trailed, or elongated stars in long-exposure astrophotographs are something that every astrophotographer runs into sooner or later. Usually sooner!

 

I’ve got a lot of tips here to help you diagnose and solve problems with trailed stars.

 

Let me know what you think!

 

Jerry

 

attachicon.gifTrails_09.jpg

Good stuff Jerry, I wish I had known about how to diagnose polar drift a long time ago.  It took a while to get that figured out. Im sure that future green AP'ers will really benefit from your insight! 

 

Hi Wes,

 

Thanks for taking a look!

 

Jerry



#8 GoldSpider

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Posted 24 October 2017 - 03:59 PM

I wouldn't be surprised if some of my PHD2 challenges can be traced back to some cable-tug.  I bet you could make a whole article out of the subject of cable management.

 

Edit:  If only Jerry would write an article on the subject for Sky & Telescope...


Edited by GoldSpider, 25 October 2017 - 07:35 AM.


#9 Phil Sherman

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Posted 24 October 2017 - 04:42 PM

I think that very few of us can take exposures of a worm period or longer without saturating the image. The longest I can do at home is around one minute, a result of light pollution. An alternative to a long exposure is to stack, without alignment, a series of short exposures. I've done this using 30 second exposures with great success.

 

Periodic error is easy to measure doing this if you deliberately polar misalign a bit in azimuth and measure at the meridian on the celestial equator.



#10 Goofi

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Posted 24 October 2017 - 06:45 PM

Moderator Note:

 

I added this thread to our Best Threads in Beginning Imaging




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