Date   

Re: Celestial Whale

Roland Christen
 

MaximDL has no way to tell. However it has a nifty tool that I developed to get the drift to zero in just a few minutes.

Rolando



-----Original Message-----
From: Jeff B <mnebula946@...>
To: main@ap-gto.groups.io
Sent: Fri, May 14, 2021 2:02 pm
Subject: Re: [ap-gto] Celestial Whale

Yeah I'm curious too but I also imagine the software can tell you too.

On Fri, May 14, 2021 at 2:51 PM Worsel via groups.io <bryancashion=yahoo.com@groups.io> wrote:
Roland

That's amazing performance.  Do you have an idea how polar mis-aligned the setup was, even qualitatively?

Bryan

--
Roland Christen
Astro-Physics


Re: Dual scope setup question

Emilio J. Robau, P.E.
 

I would say coordinated dithering and coordinated focusing are the issues.  However, the latter is less of an issue.

 

From: Emilio J. Robau, P.E.
Sent: Friday, May 14, 2021 3:15 PM
To: main@ap-gto.groups.io
Subject: RE: [ap-gto] Dual scope setup question

 

I guess running one at a time would be okay, but what is the sense?   With the cheap Chinese cameras you could get lucky and get a good camera and run both cameras at one time.  Why not?

 

NINA, SGP, APT, and Voyager can deal with multiple instances with no issues.  I have run the QHY 294 and a ASI 1600 along with a Moravian 16200 with no issues.  I have run all the aforementioned applications with an array.   I ran the 294 in 1 bin mode and it produced 92 meg subs.   That is the largest size sub I have encountered.  No issues.

 

The main issue is coordinated dithering.  APT can’t focus embedded in a sequence so that one is not very useful due to that lack of functionality.

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Christopher Erickson
Sent: Friday, May 14, 2021 3:09 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Dual scope setup question

 

If you are only running one at a time, having a NUC for each cam and OTA works fine.

 

In fact I don't know of any capturing software that can handle two big cams at once and be able to handle automated scheduling.


-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

 

On Fri, May 14, 2021, 4:45 AM Emilio J. Robau, P.E. <ejr@...> wrote:

I run three scopes on one AP1600 mount with one computer.   I don’t know how you would get coordinated dithering if you place a computer on each scope and think that having multiple computers on one mount is not the solution.   The only challenge I have besides and occasional flexure of one of the scopes which misaligns it is coordinated dithering.  I just trash a sub or two when dithering interferes.   NINA has coordinated dithering, but I have not tried it yet.  I find it somewhat efficient to just lose a sub or two due to dithering.

 

Emilio

 

Chris,

 

I never thought about this, it is a great idea to use 2 computers to make two systems independent. 

 

Yanzhe

 

On Wed, May 12, 2021 at 11:44 PM Christopher Erickson <christopher.k.erickson@...> wrote:

Personally if I were doing a dual scope setup on one mount I would put a NUC on top of each OTA and have two serial cords going down to the two serial ports on the CP3/4/5. SO MUCH EASIER to get the software bits to all work correctly when each NUC only sees one cam, one filter wheel, one mount, one focuser, one autoguider, etc.

 

Or MUCH BETTER yet, give each OTA it's own AP mount.

 

And just like I always say...


"My advice is free and worth every penny!"

 

-Christopher Erickson

Observatory Engineer

Summit Kinetics

Waikoloa, Hawaii

 

 

Virus-free. www.avg.com

 

On Wed, May 12, 2021 at 6:02 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:

If each gas it's own OAG, no problem.

I can't advise on 'wiring' as I use an AP1200 which doesn't have
thru the mount access. I would say just minimize and carefully
route the cables, bundle and cord wrap.


Kent Kirkley

 

 

 

-----Original Message-----
From: yanzhe liu <liuyanzhe@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 7:16 pm
Subject: Re: [ap-gto] Dual scope setup question

Yes, Imaging.

 

When you say both can work, are you talking about "piggy back" and "side by side"?

How about power supply and USB?

 

Each will have its own OAG to eliminate flexure.

 

Yanzhe

 

On Wed, May 12, 2021 at 2:09 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:

By 'one at a time", are you referring to imaging?
Either way can work, I've done both.
The biggest issue will be the possibility of flexure between
components depending on how you will be guiding.
If you intend to use an off axis guider on both scopes, no problem.
If you intend to use a guide scope of some sort, be wary of how it's
mounted. Scopes are usually mounted in rings which have felt, cork or
some other material lining them. If a guide scope is mounted on the rings,
the main scope can move slightly within the rings which the guider won't

know about. The result, oval or trailed stars.

 

To prevent this, mount the guide scope directly on the primary instrument, not
on the rings.
This also applies to a side by side set up where you mount the guide scope
on the side by side plate.

Kent Kirkley

 

 

 

-----Original Message-----
From: yanzhe liu <liuyanzhe@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 3:53 pm
Subject: [ap-gto] Dual scope setup question

Have been thinking of setting up two scopes (4" and 5") on AP1100, only 1 scope will be used at any time.

A few questions on exactly how it should be configured/connected.

- Piggy back vs side by side? Which is the preferred way.

- I am thinking of having 3 110v/12V power adapters, and 3 USB ports.

One power adapter and one USB port are for connecting GTOCP3.

Each telescope will have a power adapter and a USB port, which provide power and communication for all gears eg, CCD/focuser/dew controller/USB hub etc.

 

I am not too sure whether there are any potential issues with this setup:

- Can all 4 cables (2 powers and 2 USB2 cables) go through AP1100?

- Is there any concern on the electrical side, e.g. USB ground loop or something similar?

- Or is it possible to have 2 scopes sharing the same power and USB? Then I need a IP controller 12v power switch?

 

Yanzhe

 

 


Re: How important is THUM? #APCC

John Chakel
 

PegasusAstro had also posted this today as well.
"Price range will be close to 350-400 USD and yes, we aim to provide the gps coord / temp and abs pressure to 10micron interface.
"


Re: Dual scope setup question

Emilio J. Robau, P.E.
 

I guess running one at a time would be okay, but what is the sense?   With the cheap Chinese cameras you could get lucky and get a good camera and run both cameras at one time.  Why not?

 

NINA, SGP, APT, and Voyager can deal with multiple instances with no issues.  I have run the QHY 294 and a ASI 1600 along with a Moravian 16200 with no issues.  I have run all the aforementioned applications with an array.   I ran the 294 in 1 bin mode and it produced 92 meg subs.   That is the largest size sub I have encountered.  No issues.

 

The main issue is coordinated dithering.  APT can’t focus embedded in a sequence so that one is not very useful due to that lack of functionality.

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Christopher Erickson
Sent: Friday, May 14, 2021 3:09 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Dual scope setup question

 

If you are only running one at a time, having a NUC for each cam and OTA works fine.

 

In fact I don't know of any capturing software that can handle two big cams at once and be able to handle automated scheduling.


-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

 

On Fri, May 14, 2021, 4:45 AM Emilio J. Robau, P.E. <ejr@...> wrote:

I run three scopes on one AP1600 mount with one computer.   I don’t know how you would get coordinated dithering if you place a computer on each scope and think that having multiple computers on one mount is not the solution.   The only challenge I have besides and occasional flexure of one of the scopes which misaligns it is coordinated dithering.  I just trash a sub or two when dithering interferes.   NINA has coordinated dithering, but I have not tried it yet.  I find it somewhat efficient to just lose a sub or two due to dithering.

 

Emilio

 

Chris,

 

I never thought about this, it is a great idea to use 2 computers to make two systems independent. 

 

Yanzhe

 

On Wed, May 12, 2021 at 11:44 PM Christopher Erickson <christopher.k.erickson@...> wrote:

Personally if I were doing a dual scope setup on one mount I would put a NUC on top of each OTA and have two serial cords going down to the two serial ports on the CP3/4/5. SO MUCH EASIER to get the software bits to all work correctly when each NUC only sees one cam, one filter wheel, one mount, one focuser, one autoguider, etc.

 

Or MUCH BETTER yet, give each OTA it's own AP mount.

 

And just like I always say...


"My advice is free and worth every penny!"

 

-Christopher Erickson

Observatory Engineer

Summit Kinetics

Waikoloa, Hawaii

 

 

Virus-free. www.avg.com

 

On Wed, May 12, 2021 at 6:02 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:

If each gas it's own OAG, no problem.

I can't advise on 'wiring' as I use an AP1200 which doesn't have
thru the mount access. I would say just minimize and carefully
route the cables, bundle and cord wrap.


Kent Kirkley

 

 

 

-----Original Message-----
From: yanzhe liu <liuyanzhe@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 7:16 pm
Subject: Re: [ap-gto] Dual scope setup question

Yes, Imaging.

 

When you say both can work, are you talking about "piggy back" and "side by side"?

How about power supply and USB?

 

Each will have its own OAG to eliminate flexure.

 

Yanzhe

 

On Wed, May 12, 2021 at 2:09 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:

By 'one at a time", are you referring to imaging?
Either way can work, I've done both.
The biggest issue will be the possibility of flexure between
components depending on how you will be guiding.
If you intend to use an off axis guider on both scopes, no problem.
If you intend to use a guide scope of some sort, be wary of how it's
mounted. Scopes are usually mounted in rings which have felt, cork or
some other material lining them. If a guide scope is mounted on the rings,
the main scope can move slightly within the rings which the guider won't

know about. The result, oval or trailed stars.

 

To prevent this, mount the guide scope directly on the primary instrument, not
on the rings.
This also applies to a side by side set up where you mount the guide scope
on the side by side plate.

Kent Kirkley

 

 

 

-----Original Message-----
From: yanzhe liu <liuyanzhe@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 3:53 pm
Subject: [ap-gto] Dual scope setup question

Have been thinking of setting up two scopes (4" and 5") on AP1100, only 1 scope will be used at any time.

A few questions on exactly how it should be configured/connected.

- Piggy back vs side by side? Which is the preferred way.

- I am thinking of having 3 110v/12V power adapters, and 3 USB ports.

One power adapter and one USB port are for connecting GTOCP3.

Each telescope will have a power adapter and a USB port, which provide power and communication for all gears eg, CCD/focuser/dew controller/USB hub etc.

 

I am not too sure whether there are any potential issues with this setup:

- Can all 4 cables (2 powers and 2 USB2 cables) go through AP1100?

- Is there any concern on the electrical side, e.g. USB ground loop or something similar?

- Or is it possible to have 2 scopes sharing the same power and USB? Then I need a IP controller 12v power switch?

 

Yanzhe

 

 


Re: Counterweight Shaft Travel Storage

John A. Sillasen
 

Very good & solid (grin) advice,  Fernando, thank you. In fact,  I have threaded caps for both ends.  I think I plan to have the case and its contents,  lying under my bad and between the ScopeGuard case with the Mach 1 and a bunch of eyepiece cases or the Stowaway case.  The Mach 1 tends to ride with me even if the 1100 is to be the primary mount. 

I think,  at least at this point,  the Eagle Pier will come out so the ATS Pier can be strapped against the wall in the same location that held the Eagle. Not that any of that has to do with the counterweight shaft and its carry case, just free association for space management.  I gain very little taking the ScopeGuard case out and it does a good job keeping things on the bed in the van where I left them for travel.

Good advice,  thank you.  I do hate the thought of buying a special tool for cutting the PVC pipe to size for this one time job, though. I've got the purple goo to put the male thread cap on the pipe.  Maybe just a Iittle Teflon tape over the threads will help keep the end caps on better. 

Thanks for all the advice!  Exactly what the purpose of this group is and it does it well.



John A. Sillasen



Re: Dual scope setup question

Christopher Erickson
 

If you are only running one at a time, having a NUC for each cam and OTA works fine.

In fact I don't know of any capturing software that can handle two big cams at once and be able to handle automated scheduling.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   


On Fri, May 14, 2021, 4:45 AM Emilio J. Robau, P.E. <ejr@...> wrote:

I run three scopes on one AP1600 mount with one computer.   I don’t know how you would get coordinated dithering if you place a computer on each scope and think that having multiple computers on one mount is not the solution.   The only challenge I have besides and occasional flexure of one of the scopes which misaligns it is coordinated dithering.  I just trash a sub or two when dithering interferes.   NINA has coordinated dithering, but I have not tried it yet.  I find it somewhat efficient to just lose a sub or two due to dithering.

 

Emilio

 

Chris,

 

I never thought about this, it is a great idea to use 2 computers to make two systems independent. 

 

Yanzhe

 

On Wed, May 12, 2021 at 11:44 PM Christopher Erickson <christopher.k.erickson@...> wrote:

Personally if I were doing a dual scope setup on one mount I would put a NUC on top of each OTA and have two serial cords going down to the two serial ports on the CP3/4/5. SO MUCH EASIER to get the software bits to all work correctly when each NUC only sees one cam, one filter wheel, one mount, one focuser, one autoguider, etc.

 

Or MUCH BETTER yet, give each OTA it's own AP mount.

 

And just like I always say...


"My advice is free and worth every penny!"

 

-Christopher Erickson

Observatory Engineer

Summit Kinetics

Waikoloa, Hawaii

 

 

Virus-free. www.avg.com

 

On Wed, May 12, 2021 at 6:02 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:

If each gas it's own OAG, no problem.

I can't advise on 'wiring' as I use an AP1200 which doesn't have
thru the mount access. I would say just minimize and carefully
route the cables, bundle and cord wrap.


Kent Kirkley

 

 

 

-----Original Message-----
From: yanzhe liu <liuyanzhe@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 7:16 pm
Subject: Re: [ap-gto] Dual scope setup question

Yes, Imaging.

 

When you say both can work, are you talking about "piggy back" and "side by side"?

How about power supply and USB?

 

Each will have its own OAG to eliminate flexure.

 

Yanzhe

 

On Wed, May 12, 2021 at 2:09 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:

By 'one at a time", are you referring to imaging?
Either way can work, I've done both.
The biggest issue will be the possibility of flexure between
components depending on how you will be guiding.
If you intend to use an off axis guider on both scopes, no problem.
If you intend to use a guide scope of some sort, be wary of how it's
mounted. Scopes are usually mounted in rings which have felt, cork or
some other material lining them. If a guide scope is mounted on the rings,
the main scope can move slightly within the rings which the guider won't

know about. The result, oval or trailed stars.

 

To prevent this, mount the guide scope directly on the primary instrument, not
on the rings.
This also applies to a side by side set up where you mount the guide scope
on the side by side plate.

Kent Kirkley

 

 

 

-----Original Message-----
From: yanzhe liu <liuyanzhe@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 3:53 pm
Subject: [ap-gto] Dual scope setup question

Have been thinking of setting up two scopes (4" and 5") on AP1100, only 1 scope will be used at any time.

A few questions on exactly how it should be configured/connected.

- Piggy back vs side by side? Which is the preferred way.

- I am thinking of having 3 110v/12V power adapters, and 3 USB ports.

One power adapter and one USB port are for connecting GTOCP3.

Each telescope will have a power adapter and a USB port, which provide power and communication for all gears eg, CCD/focuser/dew controller/USB hub etc.

 

I am not too sure whether there are any potential issues with this setup:

- Can all 4 cables (2 powers and 2 USB2 cables) go through AP1100?

- Is there any concern on the electrical side, e.g. USB ground loop or something similar?

- Or is it possible to have 2 scopes sharing the same power and USB? Then I need a IP controller 12v power switch?

 

Yanzhe

 

 


Re: Celestial Whale

Jeff B
 

Yeah I'm curious too but I also imagine the software can tell you too.


On Fri, May 14, 2021 at 2:51 PM Worsel via groups.io <bryancashion=yahoo.com@groups.io> wrote:
Roland

That's amazing performance.  Do you have an idea how polar mis-aligned the setup was, even qualitatively?

Bryan


Re: Celestial Whale

Roland Christen
 

I can't quantify it in terms of polar misalignment, but the Dec drift was about 2 arc sec per minute. That's about 10 times higher than what I would normally want.

Rolando

-----Original Message-----
From: Worsel via groups.io <bryancashion@...>
To: main@ap-gto.groups.io
Sent: Fri, May 14, 2021 1:49 pm
Subject: Re: [ap-gto] Celestial Whale

Roland

That's amazing performance.  Do you have an idea how polar mis-aligned the setup was, even qualitatively?

Bryan

--
Roland Christen
Astro-Physics


Re: How important is THUM? #APCC

Worsel
 

PegasusAstro posted this May 13 on their forum in response to a query about availability.  Nothing on cost.


"Unfortunately it will take more than 2 months due to shortage of electronic components in the market."


Bryan


Re: Celestial Whale

Worsel
 

Roland

That's amazing performance.  Do you have an idea how polar mis-aligned the setup was, even qualitatively?

Bryan


Re: Celestial Whale

Roland Christen
 

It's really simple. And it's a keypad thing, for the most part for people who set up in the field and don't want to spend a lot of time polar aligning.

So basically you pick your object at the beginning of your session, start guiding and start taking images. Just as you would normally do. Then, as the mount is guiding, you start the drift model and press Enter. Wait 5 to 10 minutes and press Enter again. Then exit the model and turn the model compensation on. Your drift model will begin adjusting the sidereal and Dec tracking rate so that the guide star basically stays put and all you need are occasional steering bumps with your guiding software. You can turn down the aggressiveness to around 3 or 4 and take longish guide exposures to avoid chasing the seeing.

After an hour or so you can repeat the process. Use "Add To Model" to establish another model term and just continue to image while the mount is gathering data for the model. You can add any number of points for any other objects during the night or during subsequent sessions as long as you don't disturb the mount setup.

Bump guiding is simply another way you can use the model tool.

Rolando



-----Original Message-----
From: Dean Jacobsen <deanjacobsen@...>
To: main@ap-gto.groups.io
Sent: Fri, May 14, 2021 11:06 am
Subject: Re: [ap-gto] Celestial Whale

Roland, I know that you have discussed nudge guiding here several times but have you posted a write up on your method somewhere on the AP site that we can copy and use as a reference?
--
Dean Jacobsen
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/

--
Roland Christen
Astro-Physics


Re: How important is THUM? #APCC

Bill Long
 

Not clue yet. Its also been postponed quite a bit. 


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Chris White <chris.white@...>
Sent: Friday, May 14, 2021 7:48 AM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] How important is THUM? #APCC
 
That looks great Bill.  Any rumors on cost?  


Re: Celestial Whale

Dean Jacobsen
 

Roland, I know that you have discussed nudge guiding here several times but have you posted a write up on your method somewhere on the AP site that we can copy and use as a reference?
--
Dean Jacobsen
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/


Re: Dual scope setup question

Emilio J. Robau, P.E.
 

I think the big issue is coordinated dithering if you are so inclined to not loose subs to another issue besides satellites, wind gusts and so on and so forth.

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Frank Widmann via groups.io
Sent: Friday, May 14, 2021 11:44 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Dual scope setup question

One computer can handle all of the equipment for two scopes with no problem. Other than camera downloads, most of the interfaces are low data rate. I considered mounting a computer on the declination axis, but computers have limited USB ports so you have to add a hub. Once you add a hub, why expose your computer to the elements? It is also hard to change computer connections in a cable rich environment. Instead I run two 7-port powered hubs and keep the computer in the cabinet.

One other thing I didn’t mention previously is that I download images directly to One Drive on the capture computer. They are stored on the computer’s hard drive, but are immediately available to my image processing system. Once the images are in the processing system I can remove them from the capture drive to make room for more. I image automatically all night, and I can wake up at any time and do a quick progress check by opening One Drive on my iPad and confirming that files are being added.

Frank


Re: Dual scope setup question

Frank Widmann
 

One computer can handle all of the equipment for two scopes with no problem. Other than camera downloads, most of the interfaces are low data rate. I considered mounting a computer on the declination axis, but computers have limited USB ports so you have to add a hub. Once you add a hub, why expose your computer to the elements? It is also hard to change computer connections in a cable rich environment. Instead I run two 7-port powered hubs and keep the computer in the cabinet.

One other thing I didn’t mention previously is that I download images directly to One Drive on the capture computer. They are stored on the computer’s hard drive, but are immediately available to my image processing system. Once the images are in the processing system I can remove them from the capture drive to make room for more. I image automatically all night, and I can wake up at any time and do a quick progress check by opening One Drive on my iPad and confirming that files are being added.

Frank


Re: How important is THUM? #APCC

Chris White
 

That looks great Bill.  Any rumors on cost?  


Re: Dual scope setup question

Emilio J. Robau, P.E.
 

I run three scopes on one AP1600 mount with one computer.   I don’t know how you would get coordinated dithering if you place a computer on each scope and think that having multiple computers on one mount is not the solution.   The only challenge I have besides and occasional flexure of one of the scopes which misaligns it is coordinated dithering.  I just trash a sub or two when dithering interferes.   NINA has coordinated dithering, but I have not tried it yet.  I find it somewhat efficient to just lose a sub or two due to dithering.

 

Emilio

 

Chris,

 

I never thought about this, it is a great idea to use 2 computers to make two systems independent. 

 

Yanzhe

 

On Wed, May 12, 2021 at 11:44 PM Christopher Erickson <christopher.k.erickson@...> wrote:

Personally if I were doing a dual scope setup on one mount I would put a NUC on top of each OTA and have two serial cords going down to the two serial ports on the CP3/4/5. SO MUCH EASIER to get the software bits to all work correctly when each NUC only sees one cam, one filter wheel, one mount, one focuser, one autoguider, etc.

 

Or MUCH BETTER yet, give each OTA it's own AP mount.

 

And just like I always say...


"My advice is free and worth every penny!"

 

-Christopher Erickson

Observatory Engineer

Summit Kinetics

Waikoloa, Hawaii

 

 

Virus-free. www.avg.com

 

On Wed, May 12, 2021 at 6:02 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:

If each gas it's own OAG, no problem.

I can't advise on 'wiring' as I use an AP1200 which doesn't have
thru the mount access. I would say just minimize and carefully
route the cables, bundle and cord wrap.


Kent Kirkley

 

 

 

-----Original Message-----
From: yanzhe liu <liuyanzhe@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 7:16 pm
Subject: Re: [ap-gto] Dual scope setup question

Yes, Imaging.

 

When you say both can work, are you talking about "piggy back" and "side by side"?

How about power supply and USB?

 

Each will have its own OAG to eliminate flexure.

 

Yanzhe

 

On Wed, May 12, 2021 at 2:09 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:

By 'one at a time", are you referring to imaging?
Either way can work, I've done both.
The biggest issue will be the possibility of flexure between
components depending on how you will be guiding.
If you intend to use an off axis guider on both scopes, no problem.
If you intend to use a guide scope of some sort, be wary of how it's
mounted. Scopes are usually mounted in rings which have felt, cork or
some other material lining them. If a guide scope is mounted on the rings,
the main scope can move slightly within the rings which the guider won't

know about. The result, oval or trailed stars.

 

To prevent this, mount the guide scope directly on the primary instrument, not
on the rings.
This also applies to a side by side set up where you mount the guide scope
on the side by side plate.

Kent Kirkley

 

 

 

-----Original Message-----
From: yanzhe liu <liuyanzhe@...>
To: main@ap-gto.groups.io
Sent: Wed, May 12, 2021 3:53 pm
Subject: [ap-gto] Dual scope setup question

Have been thinking of setting up two scopes (4" and 5") on AP1100, only 1 scope will be used at any time.

A few questions on exactly how it should be configured/connected.

- Piggy back vs side by side? Which is the preferred way.

- I am thinking of having 3 110v/12V power adapters, and 3 USB ports.

One power adapter and one USB port are for connecting GTOCP3.

Each telescope will have a power adapter and a USB port, which provide power and communication for all gears eg, CCD/focuser/dew controller/USB hub etc.

 

I am not too sure whether there are any potential issues with this setup:

- Can all 4 cables (2 powers and 2 USB2 cables) go through AP1100?

- Is there any concern on the electrical side, e.g. USB ground loop or something similar?

- Or is it possible to have 2 scopes sharing the same power and USB? Then I need a IP controller 12v power switch?

 

Yanzhe

 

 


Re: Celestial Whale

Roland Christen
 

Well, not totally unguided, rather it is nudge guided Smile It's like a horse that follows the trail but every once in a while you have to spur it along when it stops to eat grass off the side of the trail.

Rolando



-----Original Message-----
From: Edward Beshore via groups.io <ebeshore@...>
To: main@ap-gto.groups.io
Sent: Fri, May 14, 2021 8:02 am
Subject: Re: [ap-gto] Celestial Whale

This is quite impressive at only 70” across, resolving stars at the edge of the galaxy. Unguided! 
I  put my name on the list for a Mach 2 a couple of months ago. I’m going to have to start exercising to make sure I’m around to enjoy it… 

--
Roland Christen
Astro-Physics


Re: Celestial Whale

Edward Beshore
 

This is quite impressive at only 70” across, resolving stars at the edge of the galaxy. Unguided! 

I  put my name on the list for a Mach 2 a couple of months ago. I’m going to have to start exercising to make sure I’m around to enjoy it… 


Re: How important is THUM? #APCC

Bill Long
 

Well whenever this starts shipping, I'll get one:


https://pegasusastro.com/products/uranus-meteo-sensor/


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Chris White <chris.white@...>
Sent: Friday, May 14, 2021 4:25 AM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] How important is THUM? #APCC
 
On Thu, May 13, 2021 at 10:14 PM, Seb@stro wrote:
You're welcome Chris. Let me know if I have overlooked some crucial step. Hope this helps.
I'm all set.  Installed the Pegasus Observing driver, and got the API for pressure... everything is installed, activated and working!  Appreciate the help.  Love not needing to get a new device.  :-)

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