Alighnment Discrepencies

Asked by Lee Spencer on 2017-03-21

Hi All
First I think the products great. Hopefully someone may be able to help me. I have a new Celestron 5SE. My laptop has version 11.2 connected via plugin. My wifes laptop has 15.1 via Stellarium Scope. My telescope is new XMAS so I,ve only had a few tries but last night I checked both versions and they were doing the same thing.
I first aligned mount and then connected to stellarium. Chose and slew to target. Scope did not quite reach target on all occasions seemed to be out by same amount on all selected. I then selected the same objects using the handset object list. Scope centered each time back forth ie Sirius to procyn to rigel back for no problem with mount. Stellarium did track movement but not quite centered on screen cross hairs.
I then centered same stairs with stellarium again they slew to objects but not centred(not centred means not in eyepiece but very near). I found that if I pick an object and slew to it in both versions of Stellarium I,m not centred or can just see object in eyepiece. If I the go to handset and pick the same object in handset this will then centre object showing the movement on screen crosshairs are out but object is now centered in eyepiece. So at the moment I can slew nearly to objects with stellarium but have to complete alighnment using handset object list to get object in eyepiece. Note: Final movement shown on screen crosshairs now not shown centered on target even though it is.
It seems that mount is accurate in alighnment both stand alone and connected to both versions of stellarium. Stellarium is accurate too, it is out by same amount all the time so mismatch between systems is constant not random, for some reason is not quite matching up with co ordinates of handset. Slightly out. It seems that handset knows were it is and where to goto and is accurate. Stellarium shows where the scope is and indicates position on screen as being slightly out. This tells me that information sent from handset is wrong or being slightly missinterpretated by stellarium. Stellarium is functioning correctly with information being given ie it thinks its in the right place.
Can anybody help me sync both handset and stellarium? I must be doing something wrong. Does date and time and location co-ordintes have to be exactly the same in both handset and stellarium to be accurate?
hopefully I will go out and try again tonight. Try changing J2000 settings, time location. Try cheating the system by moving lat/lon settings etc
Regards
Lee

Question information

Language:
English Edit question
Status:
Expired
For:
Stellarium Edit question
Assignee:
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Last query:
2017-04-06
Last reply:
2017-04-22
Lee Spencer (deeplake9) said : #1

Hi
I forgot to mention I am using ascom 6.1 platform and celestron plugin.Strange that both laptops out by same amount?
Regards
Lee

    On Tuesday, 21 March 2017, 11:52, Lee Spencer <email address hidden> wrote:

 New question #578544 on Stellarium:
https://answers.launchpad.net/stellarium/+question/578544

Hi All
First I think the products great. Hopefully someone may be able to help me. I have a new Celestron 5SE. My laptop has version 11.2 connected via plugin. My wifes laptop has 15.1 via Stellarium Scope. My telescope is new XMAS so I,ve only had a few tries but last night I checked both versions and they were doing the same thing.
I first aligned mount and then connected to stellarium. Chose and slew to target. Scope did not quite reach target on all occasions seemed to be out by same amount on all selected. I then selected the same objects using the handset object list. Scope centered each time back forth ie Sirius to procyn to rigel back for no problem with mount. Stellarium did track movement but not quite centered on screen cross hairs.
I then centered same stairs with stellarium again they slew to objects but not centred(not centred  means not in eyepiece but very near). I found that if I pick an object and slew to it in both versions of Stellarium I,m not centred or can just see object in eyepiece. If  I the go to handset and pick the same object in handset this will then centre object showing the movement on screen crosshairs are out but object is now centered in eyepiece. So at the moment I can slew nearly to objects with stellarium but have to complete alighnment using handset object list to get object in eyepiece. Note: Final movement shown on screen crosshairs now not shown centered on target even though it is.
It seems that mount is accurate in alighnment both stand alone and connected to both versions of stellarium. Stellarium is accurate too, it is out by same amount all the time so mismatch between systems is constant not random, for some reason is not quite matching up with co ordinates of handset. Slightly out. It seems that handset knows were it is and where to goto and is accurate. Stellarium shows where the scope is and indicates position on screen as being slightly out.  This tells me that information sent from handset is wrong or being slightly missinterpretated by stellarium. Stellarium is functioning correctly with information being given ie it thinks its in the right place.
Can anybody help me sync both handset and stellarium? I must be doing something wrong. Does date and time and location co-ordintes have to be exactly the same in both handset and stellarium to be accurate?
hopefully I will go out and try again tonight. Try changing J2000 settings, time location. Try cheating the system by moving lat/lon settings etc
Regards
Lee

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gzotti (georg-zotti) said : #2

I think I have answered exactly this in just the previous question.

https://answers.launchpad.net/stellarium/+question/576892

Lee Spencer (deeplake9) said : #3

Hi gzotti, I had read your previous answer before writing regarding j2000. I will try resetting handset handset tonight ect to sync both sytems. Handset/scope accurate when aligning but must be sending slightly wrong co-ordinates to stellarium?Can only check with stars. Can't simulate indoors.Thanks for reply. Will let you know how I get on.
Lee

    On Tuesday, 21 March 2017, 12:37, gzotti <email address hidden> wrote:

 Your question #578544 on Stellarium changed:
https://answers.launchpad.net/stellarium/+question/578544

    Status: Open => Answered

gzotti proposed the following answer:
I think I have answered exactly this in just the previous question.

https://answers.launchpad.net/stellarium/+question/576892

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Launchpad Janitor (janitor) said : #4

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

Lee Spencer (deeplake9) said : #5

Hi gzotti

Sorry for not replying earlier. I have been testing scope goto alignment on a standalone basis and together with 2 versions of Stellarium,11.2 via Nexremote/plugin and 15.1 via Stellarium scope and via Nextremote/plugin. I have also purchased a receptacle eyepiece so I can improve alignment accuracy. Due to climate I have not been able to test live recently only 3 nights viewing. I was going to reply when I had carried out more live viewing and had more test results. I have done loads of indoor testing though.
My results and conclusions so far are as follows:
1) I have take your previous advice change mode from (default) to Equinox of the date(now) modes. I have tested many times indoors. This does seem to have improved the accuracy on the screen. But the jury is still out for accuracy when viewing live.
Can you advise the difference in both above modes?
2) When indoors simulating I click on say Jupiter, then zoom in on object press ctrl 1 and watch crosshairs finishing position when target is obtained. I do the same using scope goto controls. Going say between Mars Venus Mercury many times. Checking all combinations ie versions/ J2000/Equinox ect.
I have never on screen in zoom got the cross hairs to directly centre on target either by scope goto or Stellarium control. It seems that both the scope and program cant exactly agree on co-ordinates. What I don’t understand is how Stellarium agrees with scope HC where target is. IE when scope is first aligned and ready for connection, I would have thought that the co-ordinates being sent out by HC are the basis that the object is centred so should at this point be shown dead centre of object(in zoom). This is not the case. Therefore stellarium disagrees with co-ordinates being sent from the start. When Stellarium is asked to centre on the same object you can see the crosshairs move to a different place in zoom. So in zoom you can move crosshairs to 2 different places by using scope goto and Stellarium goto commands both not centred though. So at this stage there seems to be no agreement between centre of object shown on screen scope goto and Stellarium crosshairs finishing positions in zoom.
3) When outdoors observing in eyepiece I have found that by carrying out a 2 star alignment/re-aligning for accuracy that if you goto say Jupiter/Moon Stellarium will get top/left of object. If you goto a deepsky object say M45 this may not quite be in eyepiece, but since I know that I will be top/left of target I can find target, since although not centred misalignment is always constant.

My Conclusion is that firstly I have no complaints regarding Stellarium. I have managed to find every object I’ve looked for. Being an old engineer I’m trying to understand how the programs work, am I doing something wrong with alignment times, location details etc ect. The programs seem complex. Maybe I’m looking for something I,m never going to achieve and should be happy that this is as accurate as you gonna get mate.

Please answer ques re modes:

Regards

Lee

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From: Launchpad Janitor
Sent: Thursday, April 6, 2017 11:04 AM
To: <email address hidden>
Subject: Re: [Question #578544]: Alighnment Discrepencies

Your question #578544 on Stellarium changed:
https://answers.launchpad.net/stellarium/+question/578544

    Status: Open => Expired

Launchpad Janitor expired the question:
This question was expired because it remained in the 'Open' state
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Launchpad Janitor (janitor) said : #6

This question was expired because it remained in the 'Open' state without activity for the last 15 days.