Re: [ap-gto] Re: 1100GTO star trailing


Aug 20, 2016

 


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#53626 Aug 20, 2016

Your stars are drifting which means polar alignment is not correct. There is no 3 star alignment procedure that eliminates star drift. The best way to eliminate star drift is to do a drift alignment, or use a polar scope to nail down the polar alignment. Rolando  -----Original Message-----

From: carlos49gib@... [ap-gto] ap-gto@yahoogroups.com>

To: ap-gto ap-gto@yahoogroups.com>

Sent: Sat, Aug 20, 2016 5:33 pm

Subject: [ap-gto] 1100GTO star trailing





Hi , I been all week trying to solve the star trailing using the APGTO1100, I done a few polar alignment and it fine ( did three stars alignment) but every time that I taken images, the stars tails are in every stars.



The Keypad config :no 5 S:600no 6 B:600no 7 A:1no 8 T:Side



On my PC: AP V2 ASCOM Tracking Rate: siderealGuiding R:1.00xMove R:1.00xSlew R:600x



On my PC : AP V2 ASCOM Under Mount InfomThe TZ (Time Zone) is at -2 hrsIn the Keypad it has Time Zone (Europe Spain) +1, and summer time number 1.



Can someone check this out and see if I have it correctly setup.

p>

Thanks



Charles



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#53627 Aug 20, 2016

Hi, i did a polar alignment with three star, prior i already used the Right Angle Polar Alignment. Also i parked the mount in position 1 and its with perfectly balance. Can it be the TZ -2 hours, as mentioned below i live in Europe Spain time zone +1, at summer period. The TZ -2 is not correct.

Thanks

Sent from my iPhone

On 21 Aug 2016, at 1:44 AM, chris1011@... [ap-gto] ap-gto@yahoogroups.com> wrote:



 

Your stars are drifting which means polar alignment is not correct. There is no 3 star alignment procedure that eliminates star drift. The best way to eliminate star drift is to do a drift alignment, or use a polar scope to nail down the polar alignment. Rolando  -----Original Message-----

From: carlos49gib@... [ap-gto] ap-gto@yahoogroups.com>

To: ap-gto ap-gto@yahoogroups.com>

Sent: Sat, Aug 20, 2016 5:33 pm

Subject: [ap-gto] 1100GTO star trailing





Hi , I been all week trying to solve the star trailing using the APGTO1100, I done a few polar alignment and it fine ( did three stars alignment) but every time that I taken images, the stars tails are in every stars.



The Keypad config :no 5 S:600no 6 B:600no 7 A:1no 8 T:Side



On my PC: AP V2 ASCOM Tracking Rate: siderealGuiding R:1.00xMove R:1.00xSlew R:600x



On my PC : AP V2 ASCOM Under Mount InfomThe TZ (Time Zone) is at -2 hrsIn the Keypad it has Time Zone (Europe Spain) +1, and summer time number 1.



Can someone check this out and see if I have it correctly setup.

p>

Thanks



Charles



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#53629 Aug 21, 2016

Charles, 

Roland, who responded here,  owns Astro-Physics. I would take his advice on how to use his products. :)



Sent from my Verizon, Samsung Galaxy smartphone



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#53718 Aug 27, 2016

Thanks steven

I have a permanent setup now for two year using the AP1100gto without major issues, the tail star started around the time i updated the hand control software, i am mot saying this is the course of the problem, but things started to go wrong after that. 

My setup consist of a takahashi 106ed, sx694, reducer 0.73, and tak60 for guiding. Last night , i did a balancing procedure and test the three parking 1,2,3 with perfect balancing. This time i did a polar alignment (1st option) using three stars and adjusting the polaris in the centre of the eye piece with the azimuth adjusting knobs, when i thought that it was polar alignment i target a star and was out again, but a lot but still out. I do astrophotography now for a bit and i like having object centered, even with solve plating. 

I mentioned about the time zone, because i feel that its important that the mount and the thesxyx / maxim dl do has equal location and time, and found it unusual that the AP ascom had -2 when actually should be +1 in summer hours. Is this an issue to make the star tails , i donot know.

Tonight i will repeat this polar alignment again and  try what Roland suggested

 Thanks

Sent from my iPhone



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#53719 Aug 27, 2016

Charles,  My reply was way late getting to the forum. I replied the same day of the inquiry but Yahoo has a way of delaying some posts for days it seems. Roland is your best bet on getting to the bottom of this. I.m sure Roland suggested this but I would eliminate everything you can and work from basic up to find the offending issue. I just went through a ton of troubleshooting with my objects not being where they should be in the image and after a long process finally found it was due to the ASCOM driver having an incorrect focal length which conflicted with what was in another program. I had corrected the other programs entry but didn.t realize the one in the driver was wrong as well. So things like that mask the issue. Eliminate what you can and work from there. If you are using a computer program to slew the telescope disconnect the hand controller. I have my AP1200 setup in my observatory and keep the hand controller on the shelf, disconnected. The mount is controlled via my imaging software and the latest ASCOM AP driver. I don.t connect the telescope to TheSkyX unless I really need to, in fact I don.t connect the mount to any program I don.t really need to but if I do I.m using APCC and the virtual port that.s created.  Bottom line, start basic, make sure it works, and then add programs to trouble shoot. For drift alignment I use Ray.s PEMPro and it works very well but make adjustments after a period of time between each adjustment and follow Roland.s suggestions.  .From the link below: Here are some drift alignment do's and dont's:DO level the equatorial head before you start. This isn't essential but it means that azimuth adjustments won't affect elevation adjustments (or vice-versa).DO make sure that the optical train is not flexing. Mirror flop, bendy focusers etc will ruin your attempts at polar alignment.DO make the azimuth adjustment first. It isn't significantly affected by refraction since stars are moving parallel to the horizon as they cross the meridian, so you can take time to get this as accurate as you wish.DO use the polar drift method at least for the elevation adjustment if you have a view of the pole. This is quicker and more accurate than the standard declination drift method above the horizon.DO use a star in the eastern half of the sky for the elevation adjustment if you can, when using the standard method. The effects of refraction will decrease as it rises higher in the sky. Avoid anything much below about 30 degrees altitude where the effect of refraction becomes more severe.DO use a star in the same region of sky each time for the elevation adjustment when using the standard method, if you are iterating between azimuth and elevation adjustments. Otherwise you will find a different elevation adjustment each time you do it.DO approach the pole from below for the elevation adjustment - you are raising the polar axis against gravity which may give fewer problems with backlash.DON'T expect perfection - there will always be drift in hour angle and declination as a consequence of atmospheric refraction - and we need the atmosphere to breathe!DON'T fiddle on all night - an important part of drift aligning is knowing when to stop. Remember to take some images before the clouds roll in! canburytech.net/DriftAlign/DriftAlign_3.html Rolando.        Steve          From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com] Sent: Saturday, August 27, 2016 9:45 AMTo: ap-gto@yahoogroups.comSubject: Re: [ap-gto] 1100GTO star trailing







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#53789 Aug 30, 2016

Just to thanks Roland and Steve for your advise, followed all suggestion and have a prefect alignment, took an image of 750 sec, prefect round stars

Thanks again

Charles, from Spain



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#53791 Aug 30, 2016

Woah! Great!! Glad we could be of help. Rolando -----Original Message-----

From: carlos49gib@... [ap-gto] ap-gto@yahoogroups.com>

To: ap-gto ap-gto@yahoogroups.com>

Sent: Tue, Aug 30, 2016 4:51 pm

Subject: [ap-gto] Re: 1100GTO star trailing

Just to thanks Roland and Steve for your advise, followed all suggestion and have a prefect alignment, took an image of 750 sec, prefect round stars

Thanks again

Charles, from Spain


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