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25 Jul 2018
Glad to announce of release of INDI Library v1.7.4 on 2018-07-25. A few drivers were added in this release as we continue to improve & stabilize existing drivers.
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TOPIC: How to update telescope coordinates?

How to update telescope coordinates? 4 months 4 weeks ago #25326

I don't know, do you run INDI Web Manager as root?

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Jasem Mutlaq
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How to update telescope coordinates? 4 months 4 weeks ago #25331

  • xsnrg
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@knro, I am running 1.7.1 from this package: indi-eqmod-bleeding-1.7.1-3.2.x86_64 I can get the git hash if it helps. I think I still had full logs on, so will send them your way.

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12" pier with HDX110 using EQMod
ASI 1600 mono/color mains with ASI290MM in off-axis
ASI filter wheel
Moonlite focusers for the sharpening
AT115EDT and 8" Newt for the light
Fedora Linux, 100% INDI

How to update telescope coordinates? 4 months 3 weeks ago #25473

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Some questions coming up last night...

- I am using the AZ EQ5, which is equipped with encoders. Do the encoders have any relevance in the context of alignment, plate solving, parking position? When is set the parking position in the EQMod driver to default (NCP) - is this position also linked to the encoder values?

- Polaris - upon start up, being in Munich (UTC+2), should the telescope position be RA approx. 2h and DE = 90 degrees? Leaving aside the difference between Polaris and NCP. I am asking since not sure what to expect as outcome of solver and telescope coordinates.

Many thanks, Helge

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How to update telescope coordinates? 4 months 3 weeks ago #25476

- I have a HEQ5-Pro and an AZEQ6 and both have encoders. If I recall correctly, Ekos disables the encoders of the mount. Parking the telescope will not save the state in the mount, at least not in case of the HEQ5-Pro and I think because it doesn't support it. I know this because I parked the scope with my laptop and then connected my RPi3 and it showed that the telescope was unparked.

- With the counter weights of the telescope down and the telescope above pointing at the north pole, the mount should report that it is pointing at +90 degrees Dec and the RA of the meridian, which goes from the north pole through the zenith south. This corresponds to the local sidereal time at your location.
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Modded Canon EOS 700D with a WO ZS 71 ED on a SW HEQ5-Pro /
QHY9 CCD and filter wheel with an 8" RC on a SW EQ6-R

Re:How to update telescope coordinates? 4 months 3 weeks ago #25530

@wvreeven could you clarify what you call encoders? My understanding is that HEQ5 and EQ6 know when one gear step passes by, therefore can count that and report the gear position, in order for a software to relate RA/DEC using a reference origin. But they do not know what the absolute position of the mount is.

-Eric

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Re:How to update telescope coordinates? 4 months 3 weeks ago #25534

Eric, sorry I was confused with the AZEQ6 which does have them. Indeed, the HEQ5-Pro doesn't.


Wouter

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Modded Canon EOS 700D with a WO ZS 71 ED on a SW HEQ5-Pro /
QHY9 CCD and filter wheel with an 8" RC on a SW EQ6-R
Last Edit: by wvreeven.

Re:How to update telescope coordinates? 4 months 3 weeks ago #25536

Now I am thoroughly confused. How can a mount know where it is pointing to if it doesn't have encoders?

That being said, I am always seeing my Atlas Pro mount, which I gather is essentially an HEQ6, being off target by 2-3 degrees upon the first slew and then again after a meridian flip, whereas my low end iOptron SmartEQPro+ always nails the intended target almost exactly on the first try. I have the suspicion that one of my settings on the Atlas Pro is off, but can't figure out which one that is supposed to be.

Perhaps someone can weigh in on that.

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Re:How to update telescope coordinates? 4 months 3 weeks ago #25537

When the EQ5 is switched on, it assumes it is pointed at the north pole (RA == local sidereal time, DE == +90 degrees). Then it needs alignment with at least 1 star in order to be able to know where it really is pointing at. Typically a 2 or 3 star alignment improves this knowledge considerably. If I then would disengage the locks on the axes, the mount would lose alignment and not know where it is pointing at. The AZEQ6 does have encoders which make sure that the mount does not lose alignment in such a case. As soon as the mount is switched off again, it loses all knowledge of where it was pointing at, hence the assumption that it is pointing at the north pole when it is switched back on.

There are mounts that can store the alignement model and where it was pointing at when switched off but the EQ5 is not one of them.
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Modded Canon EOS 700D with a WO ZS 71 ED on a SW HEQ5-Pro /
QHY9 CCD and filter wheel with an 8" RC on a SW EQ6-R

Re:How to update telescope coordinates? 4 months 3 weeks ago #25540

El Corazon wrote: Now I am thoroughly confused. How can a mount know where it is pointing to if it doesn't have encoders?

That being said, I am always seeing my Atlas Pro mount, which I gather is essentially an HEQ6, being off target by 2-3 degrees upon the first slew and then again after a meridian flip, whereas my low end iOptron SmartEQPro+ always nails the intended target almost exactly on the first try. I have the suspicion that one of my settings on the Atlas Pro is off, but can't figure out which one that is supposed to be.

Perhaps someone can weigh in on that.


They all have encoders. The earlier models have "relative encoders" and the later models have "absolute encoders". So the mounts like the EQ5 lose their position if you unlock the AZ or DEC axis. However, those like the AZ-EQ5 will not.

My friend has the Atlas Pro as well and he was having trouble with his pointing too. I think your issue is the time of year. The stars its selecting for 3 star alignment is not good enough. Its only covering half the sky. The 3 star alignment will only compensate for targets within the alignment triangle and for some reason the Atlas pro - synscan controller - is choosing the wrong stars for this time of year. You can add stars to your alignment - check your manual. Or select 3 stars that surround the whole sky you will be working in.
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Re:RE: Re:How to update telescope coordinates? 4 months 3 weeks ago #25541

El Corazon wrote: Now I am thoroughly confused. How can a mount know where it is pointing to if it doesn't have encoders?


I'd say that's a difference between absolute positioning and relative positioning, depending on the ability of encoders to provide offset as displacement from a fixed position on the gears, or from the last gear position. In the relative case, you don't know what direction the mount is in when starting up, because there is no fixed -absolute- reference.

But other things can have an impact on optimal slew, cone error for instance.

-Eric
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Re:How to update telescope coordinates? 4 months 3 weeks ago #25543

gbeaton wrote:

El Corazon wrote:
My friend has the Atlas Pro as well and he was having trouble with his pointing too. I think your issue is the time of year. The stars its selecting for 3 star alignment is not good enough. Its only covering half the sky. The 3 star alignment will only compensate for targets within the alignment triangle and for some reason the Atlas pro - synscan controller - is choosing the wrong stars for this time of year. You can add stars to your alignment - check your manual. Or select 3 stars that surround the whole sky you will be working in.


I am not even using the hand controller. The mount is directly connected to my computer.

But Eric may have put his finger on the button: I may be dealing with a rather large cone error. That might explain it. After polar alignment Polaris is not within the FOV of my telescope(s), not even the guide scope, which I have adjusted to be coaxial with the observing scope. I have not figured out yet how to correct for that on my mount, though. If anyone knows how one can make corrections to the Atlas Pro mount to get rid of cone error, please let me know as well.

Thanks!

Jo

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Re:How to update telescope coordinates? 4 months 3 weeks ago #25544

To get rid of cône error you have to physically adjust the seating or your scope in the mount. Check your manual for more. But a good 3 star alignment will help a lot.

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