Date   

Re: How to Raise AP1600 Height

Roland Christen
 

I think you can safely put the heaviest weights at the bottom of the shaft and eliminate the lighter weight and the shaft extension. You don't have to go overboard trying to get the lowest possible inertia. It won't make that much difference really.

Roland



-----Original Message-----
From: Jack Huerkamp <Mallincamusa@...>
To: main <main@ap-gto.groups.io>
Sent: Wed, Mar 18, 2020 9:11 am
Subject: Re: [ap-gto] How to Raise AP1600 Height

Rolando,

I was going to get some of those foam, colored swimming pool noogles to place around the shaft.  I am also going to re-order the weights on the shaft to see if I can eliminate the shaft extension.  I have the 30# weights closest to the RA Axis with the 24# and 10# below them.  The shaft extension joint is under the 10# weight and I need to remove this weight to be able to put the safety know on the shaft.  With the weights re-ordered, I should be able to eliminate the shaft extension - that is what I normally bump into.


Re: Keypad Upgrade for Using Mach2

Dean Jacobsen
 

When I use the mount for visual [not often] I use Sky Safari on my iPad.  The iPad is connected to the mount with something they called "Sky Wire".  It works beautifully.   No computer required.  I initialize the mount with the keypad and then start Sky Safari on the iPad.
--
Dean Jacobsen
http://astrophoto.net/wp/ 
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Re: Keypad Upgrade for Using Mach2

Terri Zittritsch
 

On Sat, Mar 14, 2020 at 08:21 PM, Robert Berta wrote:
Terri Zittritsch You can run Sky Safari on Windows 10 platform..
Robert, thank you for the response.. just seeing it now.
I currently have ski safari pro on my macbook and my IOS devices (IPAD and iphone) so will likely not purchase another platform license.    I've been suffering with Cartes du ciel on my PC, but it is stable, and I like stable over just about everything else.  Suffering is the wrong word given it's free, and quite powerful (just slow and not very pretty).    Stellarium is prettier, much faster and nicer interface, but isn't as stable with it's add on connectivity program.   I was hopeful that the wireless sky-safari connection would work reliably, so not good to hear that you experience ethernet wifi drop outs.     But, I also have a skyfi module (one of the early units).    When it comes to tech-things, I tend to be an early adopter, and suffer for it.     It connected into the handsets of my meade or atlas mounts.  I wonder if there's a way to connect via the serial ports of the CP5 controller??


Terri




Re: How to Raise AP1600 Height

Jack Huerkamp
 
Edited

Rolando,

I was going to get some of those foam, colored swimming pool noogles to place around the shaft.  I am also going to re-order the weights on the shaft to see if I can eliminate the shaft extension.  I have the 30# weights closest to the RA Axis with the 24# and 10# below them.  The shaft extension joint is under the 10# weight and I need to remove this weight to be able to put the safety knob on the shaft.  With the weights re-ordered, I should be able to eliminate the shaft extension - that is what I normally bump into.


Re: Mach2 and APCC last night

Dominique Durand
 

I'm also excited ...keypad routines ... then modeling with APPM.


Re: Mach2 and APCC last night

Wayne Hixson
 

Really looking forward to trying that modeling out


On Mar 17, 2020, at 5:19 PM, uncarollo2 <chris1011@...> via Groups.Io <chris1011@...> wrote:


I have a 1600 mount with a 1200mm fl 175EDF refractor in Hawaii. I just spent 2 weeks testing keypad software using this setup. The 1600 has encoders and is a sweet mount that is dead nuts accurate. On my first night the trade winds were blowing strong and my star excursions were up to +- 3 arc seconds from one exposure to the next. Overall tracking results were on the order of 1.2 to 1.5 arc sec rms. Even so, each 10 minute exposure had perfectly round stars of 7 arc sec FWHM.

When the trades stopped blowing a couple of nights later, the rms tracking values dropped to 0.25 and less. One night I had .09 rms tracking in a 20 minute exposure. Stars never moved more than 1/4 arc sec from the zero line.

Now, to make it even more interesting, I never used a guider for the entire 2 weeks that I was imaging. Rather I was testing the pure tracking ability of the encoder mount with a tracking model. I took hundreds of exposures with almost no rejects. I had only a couple of exposures with slight oval stars which were caused by 30mph wind gusts.

The encoders eliminate periodic error and make it possible to drive both axes at very precise custom rates that are created in a tracking model. The model I was testing happens to be the one we are adding to the new keypad software, but it applies equally to the APCC-APPM tracking model. Once you have modeled the sky, and you don't move the mount or scope, you can indeed eliminate guiding. I spent the early part of one night creating the tracking model and used it for 2 weeks. Worked perfectly every night.

If you don't have a permanent setup with good polar alignment, then guiding works fine too - as long as you have good parameters dialed in.

Rolando



-----Original Message-----
From: Cheng-Yang Tan via Groups.Io <cytan299@...>
To: main <main@ap-gto.groups.io>
Sent: Tue, Mar 17, 2020 8:43 am
Subject: Re: [ap-gto] Mach2 and APCC last night

Hi Terry,

FYI, although I don't have a Mach2, I have an AP1100 with absolute encoders. For me, the PHD2 rms guide errors are *strongly* dependent on seeing conditions. Last week on 06 March, when the seeing was terrible around here, even with encoders, the guiding was ~0.9 arcsec rms! But on Sunday night, 15 Mar, guiding was very good ~0.3 arc sec rms because the seeing was good. So although encoders help with getting rid of PE, don't expect miracles if seeing is bad.

YMMV

cytan

On Tuesday, March 17, 2020, 08:05:34 AM CDT, Terri Zittritsch <theresamarie11@...> wrote:


On Mon, Mar 16, 2020 at 10:22 PM, Allen Ruckle wrote:
Terry, 
    I am surprised to see the tracking you report as being .5 arc Sec. 35° above the Southern Horizon and .8 seconds of arc at 23° above the Horizon.
It would seem to me that if the Mach II mount with the encoders that almost completely eliminates all periodic error would have that much tracking error.

   Does the atmosphere produce that much error?  I share an observatory with a friend who has a 14.25" Newtonian f5.6, fork mounted with a 11" Byers gear on the RA and a SiTech II drive corrector. We  have gotten guiding with PHD-2 of .21 RA and .27 Dec  rms. using the Tik management feature.  The Observatory is located at the SDAA dark sky site in Tierra Del Sol about 60 miles east of San Diego at about 3600' elevation.

   I am waiting to be notified that the AP Mach2 I ordered last year.   I have been thinking it would have more accurate tracking than what I already have access to.   am I going to be disappointed?
Allen, The atmosphere creates significant star movement in my less exotic locale (at 155M in Vermont under the jet stream).      And what I'm reporting is guiding (i'm actively guiding), not tracking.  So your .21 and .27 results in around .34 arc seconds total (root of sum of squares).   What I report you should compare to the .34.    I think almost all of what i see is the atmosphere and some due to my lack of precision in setting the right guiding parameters and some over-correction, that which then needs to be corrected.   Plus, I am a portable mount, and about the best polar alignment I get is around an arc minute, maybe a bit less, but this will result in some drift that needs correction.  

Since I've never owned another A-P mount, it's hard for me to compare.   Comparing to my old mount, it's significantly more controlled.. to where I feel I can start honing my guiding and A-P skills rather than continually account for idiosyncrasies of the mount.


Terri


 


Re: Mach2 and APCC last night

Roland Christen
 

I have a 1600 mount with a 1200mm fl 175EDF refractor in Hawaii. I just spent 2 weeks testing keypad software using this setup. The 1600 has encoders and is a sweet mount that is dead nuts accurate. On my first night the trade winds were blowing strong and my star excursions were up to +- 3 arc seconds from one exposure to the next. Overall tracking results were on the order of 1.2 to 1.5 arc sec rms. Even so, each 10 minute exposure had perfectly round stars of 7 arc sec FWHM.

When the trades stopped blowing a couple of nights later, the rms tracking values dropped to 0.25 and less. One night I had .09 rms tracking in a 20 minute exposure. Stars never moved more than 1/4 arc sec from the zero line.

Now, to make it even more interesting, I never used a guider for the entire 2 weeks that I was imaging. Rather I was testing the pure tracking ability of the encoder mount with a tracking model. I took hundreds of exposures with almost no rejects. I had only a couple of exposures with slight oval stars which were caused by 30mph wind gusts.

The encoders eliminate periodic error and make it possible to drive both axes at very precise custom rates that are created in a tracking model. The model I was testing happens to be the one we are adding to the new keypad software, but it applies equally to the APCC-APPM tracking model. Once you have modeled the sky, and you don't move the mount or scope, you can indeed eliminate guiding. I spent the early part of one night creating the tracking model and used it for 2 weeks. Worked perfectly every night.

If you don't have a permanent setup with good polar alignment, then guiding works fine too - as long as you have good parameters dialed in.

Rolando



-----Original Message-----
From: Cheng-Yang Tan via Groups.Io <cytan299@...>
To: main <main@ap-gto.groups.io>
Sent: Tue, Mar 17, 2020 8:43 am
Subject: Re: [ap-gto] Mach2 and APCC last night

Hi Terry,

FYI, although I don't have a Mach2, I have an AP1100 with absolute encoders. For me, the PHD2 rms guide errors are *strongly* dependent on seeing conditions. Last week on 06 March, when the seeing was terrible around here, even with encoders, the guiding was ~0.9 arcsec rms! But on Sunday night, 15 Mar, guiding was very good ~0.3 arc sec rms because the seeing was good. So although encoders help with getting rid of PE, don't expect miracles if seeing is bad.

YMMV

cytan

On Tuesday, March 17, 2020, 08:05:34 AM CDT, Terri Zittritsch <theresamarie11@...> wrote:


On Mon, Mar 16, 2020 at 10:22 PM, Allen Ruckle wrote:
Terry, 
    I am surprised to see the tracking you report as being .5 arc Sec. 35° above the Southern Horizon and .8 seconds of arc at 23° above the Horizon.
It would seem to me that if the Mach II mount with the encoders that almost completely eliminates all periodic error would have that much tracking error.

   Does the atmosphere produce that much error?  I share an observatory with a friend who has a 14.25" Newtonian f5.6, fork mounted with a 11" Byers gear on the RA and a SiTech II drive corrector. We  have gotten guiding with PHD-2 of .21 RA and .27 Dec  rms. using the Tik management feature.  The Observatory is located at the SDAA dark sky site in Tierra Del Sol about 60 miles east of San Diego at about 3600' elevation.

   I am waiting to be notified that the AP Mach2 I ordered last year.   I have been thinking it would have more accurate tracking than what I already have access to.   am I going to be disappointed?
Allen, The atmosphere creates significant star movement in my less exotic locale (at 155M in Vermont under the jet stream).      And what I'm reporting is guiding (i'm actively guiding), not tracking.  So your .21 and .27 results in around .34 arc seconds total (root of sum of squares).   What I report you should compare to the .34.    I think almost all of what i see is the atmosphere and some due to my lack of precision in setting the right guiding parameters and some over-correction, that which then needs to be corrected.   Plus, I am a portable mount, and about the best polar alignment I get is around an arc minute, maybe a bit less, but this will result in some drift that needs correction.  

Since I've never owned another A-P mount, it's hard for me to compare.   Comparing to my old mount, it's significantly more controlled.. to where I feel I can start honing my guiding and A-P skills rather than continually account for idiosyncrasies of the mount.


Terri


 


Re: Mach2 and APCC last night

Roland Christen
 


I am surprised to see the tracking you report as being .5 arc Sec. 35° above the Southern Horizon and .8 seconds of arc at 23° above the Horizon.
I think people misunderstand what is a tracking error coming from a mount and an atmospheric seeing error caused by random motions of a star.

Certainly a star will bounce around more when it is low in the atmosphere, but that is NOT a tracking error. That is atmospheric motion which is easily enough measured simply by looking at the moment to moment position of a guide star in Declination when the guiding is turned off. As soon as you turn guiding off, the reported position of the guide star is exactly that of the atmospheric motion, and has zero to do with any king of tracking. That motion will also be present in the same amount on RA whether you are simply tracking or actively guiding. That amount is the floor below which you cannot go.

Rolando


-----Original Message-----
From: Allen Ruckle <aruckle@...>
To: main <main@ap-gto.groups.io>
Sent: Mon, Mar 16, 2020 9:22 pm
Subject: Re: [ap-gto] Mach2 and APCC last night

Terry, 
    I am surprised to see the tracking you report as being .5 arc Sec. 35° above the Southern Horizon and .8 seconds of arc at 23° above the Horizon.
It would seem to me that if the Mach II mount with the encoders that almost completely eliminates all periodic error would have that much tracking error.

   Does the atmosphere produce that much error?  I share an observatory with a friend who has a 14.25" Newtonian f5.6, fork mounted with a 11" Byers gear on the RA and a SiTech II drive corrector. We  have gotten guiding with PHD-2 of .21 RA and .27 Dec  rms. using the Tik management feature.  The Observatory is located at the SDAA dark sky site in Tierra Del Sol about 60 miles east of San Diego at about 3600' elevation.

   I am waiting to be notified that the AP Mach2 I ordered last year.   I have been thinking it would have more accurate tracking than what I already have access to.   am I going to be disappointed?

aruckle


Re: How to Raise AP1600 Height

Roland Christen
 


I have inadvertently walked into them in the darkness of the observatory  on far too many occasions.
On my observatory mounts both here and in Hawaii I have wrapped the counterweights in heavy foam shipping material. It has saved my noggin many times.

Rolando


-----Original Message-----
From: Jack Huerkamp <Mallincamusa@...>
To: main <main@ap-gto.groups.io>
Sent: Mon, Mar 16, 2020 3:33 pm
Subject: [ap-gto] How to Raise AP1600 Height

I currently have an Astro-Physics Flat Surface Adapter for 1200GTO or 1600GTO Mounts attached to a 3/4" steel plate that is bolted to a dual lifting column system I made.  When extended to their maximum height and aimed toward the south, the counterweights and shaft are right at head height, and I have inadvertently walked into them in the darkness of the observatory  on far too many occasions.  I would like to raise the mount 8" to 12".  Does AP sell an extension cylinder that will drop into the flat surface adapter and that will receive the base of the AP1600 mount?  If so, I have not found it on the AP website and I would appreciate receiving the link to it.

Yours truly,

Jack Huerkamp


APCC Pro issue with the "Move Scope" speeds

Duncan Hanford
 

I just updated APCC Pro to version 1.8.0.5 and now when I go to the "Move Scope" box the slowest speed offered is 12x sidereal. If I use the APv2 driver I can still get to 1 x,  0.5 x, and 0.25 x sidereal. This was always available in the "Move Scope" box before. What could I have set incorrectly? In case it matters I am using APCC Pro with a 1600 GTO with the CP 4 box. By the way I just bought the CP 4. I had also tried this version of APCC Pro with my old CP 3 and it had the same problem. I expected when I connected the CP 4 the problem would go away but it did not.
    Thanks in advance for any ideas,
       Duncan


moderated Re: Time to enjoy astronomy and nature

Michael Hambrick <mike.hambrick@...>
 

Besides the clouds I hope the pollen subsides a little bit. I just got home from a several week long trip and found a very heavy layer of yellow pine pollen on everything outside. From what I could estimate, the accumulation was heavy enough that it would have started to degrade images after just a few nights of viewing.

What is the conventional wisdom on pollen ? We had a similar discussion on the forum last year at this time and some members commented that they didn't do any observing during the peak pollen season.

Has anyone had any luck in preventing pollen from getting to the lens or mirror ?

What about removal ? At what point does it need to be removed ? I have heard that pollen can be very abrasive. Is there a risk of damaging the surface of the lens ? What is an acceptable technique for getting it off of the lens surface ?


Best Regards

Michael Hambrick
ARLANXEO
TSR Global Manufacturing Support
PO Box 2000
Orange, TX 77631-2000
Phone: +1 (409) 882-2799
email: mike.hambrick@...


moderated Re: Time to enjoy astronomy and nature

Dean Jacobsen
 

On Sat, Mar 14, 2020 at 08:38 PM, Marj Christen wrote:

As events and activities are cancelled and stressful news abounds, you may wish to consider indulging yourself in activities that you enjoy – hikes in the woods, preparing your garden beds for Spring, bird watching, astronomy, etc. Get up off the couch and enjoy a night under the stars and finally process those images that you have been capturing. Be sure to share your observing experiences and images with our group.

 

Marj, good advice... but can you do something about the rain around here?  :-)  I'm willing but the weather won't cooperate.  Rain and snow up at the observatory for the last week and more forecast for the next week.
 
--
Dean Jacobsen
http://astrophoto.net/wp/ 
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


moderated Re: Time to enjoy astronomy and nature

Dominique Durand
 

Here we are, in France, in general confinement.
Fortunately we still have, to us, astram, if our domicile and the weather allows it, to travel in the sky, but without sharing this pleasure with our friends.
Good sky to all of you in these difficult times and be careful for yourself and your loved ones.

Dominique


Re: Mach2 and APCC last night

Terri Zittritsch
 

On Tue, Mar 17, 2020 at 09:43 AM, Cheng-Yang Tan wrote:
Hi Terry,
 
FYI, although I don't have a Mach2, I have an AP1100 with absolute encoders. For me, the PHD2 rms guide errors are *strongly* dependent on seeing conditions. Last week on 06 March, when the seeing was terrible around here, even with encoders, the guiding was ~0.9 arcsec rms! But on Sunday night, 15 Mar, guiding was very good ~0.3 arc sec rms because the seeing was good. So although encoders help with getting rid of PE, don't expect miracles if seeing is bad.
 
YMMV
 
cytan
Cheng-Yang,  Thank you for agreeing with my feedback,  I am pretty pleased with the results on the Mach2 operation so far.. I think some others are questioning the results and I'm providing the best answers that I can.     But others, like yourself, with more experience can provide better answers.

Terri


Re: Mach2 and APCC last night

Cheng-Yang Tan
 

Hi Terry,

FYI, although I don't have a Mach2, I have an AP1100 with absolute encoders. For me, the PHD2 rms guide errors are *strongly* dependent on seeing conditions. Last week on 06 March, when the seeing was terrible around here, even with encoders, the guiding was ~0.9 arcsec rms! But on Sunday night, 15 Mar, guiding was very good ~0.3 arc sec rms because the seeing was good. So although encoders help with getting rid of PE, don't expect miracles if seeing is bad.

YMMV

cytan

On Tuesday, March 17, 2020, 08:05:34 AM CDT, Terri Zittritsch <theresamarie11@...> wrote:


On Mon, Mar 16, 2020 at 10:22 PM, Allen Ruckle wrote:
Terry, 
    I am surprised to see the tracking you report as being .5 arc Sec. 35° above the Southern Horizon and .8 seconds of arc at 23° above the Horizon.
It would seem to me that if the Mach II mount with the encoders that almost completely eliminates all periodic error would have that much tracking error.

   Does the atmosphere produce that much error?  I share an observatory with a friend who has a 14.25" Newtonian f5.6, fork mounted with a 11" Byers gear on the RA and a SiTech II drive corrector. We  have gotten guiding with PHD-2 of .21 RA and .27 Dec  rms. using the Tik management feature.  The Observatory is located at the SDAA dark sky site in Tierra Del Sol about 60 miles east of San Diego at about 3600' elevation.

   I am waiting to be notified that the AP Mach2 I ordered last year.   I have been thinking it would have more accurate tracking than what I already have access to.   am I going to be disappointed?
Allen, The atmosphere creates significant star movement in my less exotic locale (at 155M in Vermont under the jet stream).      And what I'm reporting is guiding (i'm actively guiding), not tracking.  So your .21 and .27 results in around .34 arc seconds total (root of sum of squares).   What I report you should compare to the .34.    I think almost all of what i see is the atmosphere and some due to my lack of precision in setting the right guiding parameters and some over-correction, that which then needs to be corrected.   Plus, I am a portable mount, and about the best polar alignment I get is around an arc minute, maybe a bit less, but this will result in some drift that needs correction.  

Since I've never owned another A-P mount, it's hard for me to compare.   Comparing to my old mount, it's significantly more controlled.. to where I feel I can start honing my guiding and A-P skills rather than continually account for idiosyncrasies of the mount.


Terri


 


Re: Mach2 and APCC last night

Dean Jacobsen
 

On Tue, Mar 17, 2020 at 06:05 AM, Terri Zittritsch wrote:
Comparing to my old mount, it's significantly more controlled.. to where I feel I can start honing my guiding and A-P skills rather than continually account for idiosyncrasies of the mount.
That is why we pay the big bucks for a premium mount. :-)

Now you can stop worrying about the mount.  It fades into the background and reliably does its thing.
 
--
Dean Jacobsen
http://astrophoto.net/wp/ 
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Re: Mach2 and APCC last night

Terri Zittritsch
 

On Mon, Mar 16, 2020 at 10:22 PM, Allen Ruckle wrote:
Terry, 
    I am surprised to see the tracking you report as being .5 arc Sec. 35° above the Southern Horizon and .8 seconds of arc at 23° above the Horizon.
It would seem to me that if the Mach II mount with the encoders that almost completely eliminates all periodic error would have that much tracking error.

   Does the atmosphere produce that much error?  I share an observatory with a friend who has a 14.25" Newtonian f5.6, fork mounted with a 11" Byers gear on the RA and a SiTech II drive corrector. We  have gotten guiding with PHD-2 of .21 RA and .27 Dec  rms. using the Tik management feature.  The Observatory is located at the SDAA dark sky site in Tierra Del Sol about 60 miles east of San Diego at about 3600' elevation.

   I am waiting to be notified that the AP Mach2 I ordered last year.   I have been thinking it would have more accurate tracking than what I already have access to.   am I going to be disappointed?
Allen, The atmosphere creates significant star movement in my less exotic locale (at 155M in Vermont under the jet stream).      And what I'm reporting is guiding (i'm actively guiding), not tracking.  So your .21 and .27 results in around .34 arc seconds total (root of sum of squares).   What I report you should compare to the .34.    I think almost all of what i see is the atmosphere and some due to my lack of precision in setting the right guiding parameters and some over-correction, that which then needs to be corrected.   Plus, I am a portable mount, and about the best polar alignment I get is around an arc minute, maybe a bit less, but this will result in some drift that needs correction.  

Since I've never owned another A-P mount, it's hard for me to compare.   Comparing to my old mount, it's significantly more controlled.. to where I feel I can start honing my guiding and A-P skills rather than continually account for idiosyncrasies of the mount.


Terri


 


Re: Mach2 and APCC last night

Ray Gralak
 

I am surprised to see the tracking you report as being .5 arc Sec. 35° above the Southern Horizon and .8
seconds of arc at 23° above the Horizon.
It would seem to me that if the Mach II mount with the encoders that almost completely eliminates all periodic error
would have that much tracking error.

Does the atmosphere produce that much error? I share an observatory with a friend who has a 14.25"
Newtonian f5.6, fork mounted with a 11" Byers gear on the RA and a SiTech II drive corrector. We have gotten
guiding with PHD-2 of .21 RA and .27 Dec rms. using the Tik management feature. The Observatory is located at
the SDAA dark sky site in Tierra Del Sol about 60 miles east of San Diego at about 3600' elevation.
Periodic error is completely corrected by the encoders but there are other sources of tracking error that must be minimized.

The level of tracking error will depend on the amount of uncorrected drift from polar alignment error, refraction, equipment flexure, tube currents, etc. Even with a good pointing model tracking quality is of course still dependent on the quality of local seeing and guiding algorithms.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver


-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Allen Ruckle
Sent: Monday, March 16, 2020 7:22 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Mach2 and APCC last night

Terry,
I am surprised to see the tracking you report as being .5 arc Sec. 35° above the Southern Horizon and .8
seconds of arc at 23° above the Horizon.
It would seem to me that if the Mach II mount with the encoders that almost completely eliminates all periodic error
would have that much tracking error.

Does the atmosphere produce that much error? I share an observatory with a friend who has a 14.25"
Newtonian f5.6, fork mounted with a 11" Byers gear on the RA and a SiTech II drive corrector. We have gotten
guiding with PHD-2 of .21 RA and .27 Dec rms. using the Tik management feature. The Observatory is located at
the SDAA dark sky site in Tierra Del Sol about 60 miles east of San Diego at about 3600' elevation.

I am waiting to be notified that the AP Mach2 I ordered last year. I have been thinking it would have more
accurate tracking than what I already have access to. am I going to be disappointed?

aruckle


Re: Mach2 and APCC last night

Allen Ruckle
 

Terry, 
    I am surprised to see the tracking you report as being .5 arc Sec. 35° above the Southern Horizon and .8 seconds of arc at 23° above the Horizon.
It would seem to me that if the Mach II mount with the encoders that almost completely eliminates all periodic error would have that much tracking error.

   Does the atmosphere produce that much error?  I share an observatory with a friend who has a 14.25" Newtonian f5.6, fork mounted with a 11" Byers gear on the RA and a SiTech II drive corrector. We  have gotten guiding with PHD-2 of .21 RA and .27 Dec  rms. using the Tik management feature.  The Observatory is located at the SDAA dark sky site in Tierra Del Sol about 60 miles east of San Diego at about 3600' elevation.

   I am waiting to be notified that the AP Mach2 I ordered last year.   I have been thinking it would have more accurate tracking than what I already have access to.   am I going to be disappointed?

aruckle


moderated Re: Time to enjoy astronomy and nature

Karen Christen
 

Hello everyone,

While we have an appreciation for reasoned debate, this topic has strayed.  I haven't cut it off, but will be moderating every post on this thread.  If your post is not about enjoying astronomy or nature, or otherwise entertaining yourself during these interesting times, please expect that I will delete it.  Thanks for your understanding.  
-- 
Karen Christen
Astro-Physics

 


--
Karen Christen
Astro-Physics

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