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FORUMS Photography Talk by Genre Astronomy & Celestial Talk 
Thread started 30 Oct 2017 (Monday) 15:48
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polar alignment in Southern Hemisphere

 
ctvu
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Oct 30, 2017 15:48 |  #1

Hi all,

I just bought a tracker (iOptron) and iOptron app as well, currently I am struggling with polar alignment since I am in Southern Hemisphere, the Polaris Australis is very dim, I could see the Southern Cross. I wanted to do 2-3 min long exposure.
Any tip/ help would be appreciated.
Cheers




  
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Nighthound
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Nov 17, 2017 11:34 |  #2

I have no experience with the iOptron but make sure you have it set for Southern Hemisphere. The switch marked N/S should be set to "S".

This might be helpful:
https://www.youtube.co​m/watch?v=iXVVBlvlhbE (external link)


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andyjensen
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Dec 19, 2017 23:43 |  #3

I'm not familiar with the southern sky at all (alas), but from what I've read and what I'm seeing on Stellarium, you can use the Southern Cross as a rough pointer, to get you in the vicinity. It'll kind of point to Chameleon, then you can move anti-clockwise to Octans, which looks like an almost-right triangle. South of Octans (toward the true pole) you'll find four stars in sort of a trapezoid shape; the pole star is the top left star of the trapezoid, if the wider end opens down toward the horizon.

You could also try just pointing it due south (make sure to account for your local magnetic declination) and set the angle to the local latitude (tripod level, of course), and you'll probably be close enough for round stars and 2-3 minute exposures at reasonable focal lengths. At this point, you may be able to pick out the star in the polar alignment scope; not sure how it behaves optically though.

I know your post was quite a while ago; if you haven't gotten it working to your satisfaction yet, I hope it's helpful.


Some clicking occurred, a few lenses were involved, that's about all I know ...

  
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ctvu
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Mar 11, 2018 17:13 as a reply to  @ andyjensen's post |  #4

Hi All,
Thanks for taking time to respond to my post. I have been trying other different methods from different forums, Facebook groups, etc. it is quite challenging to find the Sigma Octantis since it is so faint.
To my understanding, if I really wanted to spot on the Polaris Australis, I would need to have software (sharpcape,etc) and hardware (polemaster, telescope, etc) which I think it is one or two level up (deep sky, stars etc). At the moment I focus on the Milky way and widefield, imaging in the field, dark sky, sometimes you need to hike for a few Kms, and carry small laptop, I am not up to there yet.
once again really appreciated your posts you both.

Cheers




  
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legoman_iac
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Apr 22, 2018 19:30 as a reply to  @ ctvu's post |  #5

Any luck with this? What's the longest exposure you can take before drifting? Also might help if you can share a pic of a non-aligned image?

(Though I'm not familiar with the ioptron, so won't be able to help too much)


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polar alignment in Southern Hemisphere
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