Date   

C/2007 E1 (Garradd)

Dennis Persyk <dpersyk@...>
 

This comet is ideally positioned for imaging from the Midwest USA as
it high (57 degrees elevation) and transits at a "reasonable" hour –
that is, at astronomical darkness. At magnitude 13.0 it is an easy
target.

It has a relatively fast motion relative to the star field, 6.2 arc
seconds per minute. I imaged it in one-minute frames with at 5.0
arc seconds per pixel.

The fast relative motion lends itself to a nice animated GIF. I have
a small (422 kB) video of 1 hour of the comet traversing 6.2 arc
minutes of Leo. Take a look. The comet is really racing along!

Images, associated data and imaging notes at
http://home.att.net/~dpersyk/new.htm

This is my first image of 2007. I've been spending time on another
hobby – an indoor, non-weather-dependent hobby <G>. See
http://home.att.net/~dpersyk/horr.htm

Thank you for visiting my site.

Clear skies,

Dennis Persyk
Igloo Observatory Home Page http://dpersyk.home.att.net
Hampshire, IL


Re: Mach 1 GTO load capacity

Bob Holzer <b.holzer@...>
 

Hi Bruce:

I have no idea about the load ability, but the resolution is a
wide-field 3.5 asp so you won't need much tracking accuracy. Sounds
like it should work fine to me.

Bob



--- In ap-gto@yahoogroups.com, chris1011@... wrote:

In a message dated 4/15/2007 9:38:41 AM Central Daylight Time,
Skyloverz@... writes:


Do you believe the Mach 1 gto can hold ~ 55 lbs and maintain it's
tracking accuracy ?
Weight won't change the tracking accuracy. It is more a matter of
stability
in the wind with heavy weights and large tubes catching the breeze.


I'm dreaming of a SMALLER set-up than I have right now to include
a uhhh mmm Takahaachoo E 180 ED and IMG 6303 cam with 78 mm guide
scope...pretty compact but with rings,plates, cams..
is about 55 lbs.
Won't really know until you try it. For that you would need to come
over and
bring the equipment.

Rolando


**************************************
See what's free at
http://www.aol.com.


[Non-text portions of this message have been removed]


Re: C/2007 E1 (Garradd)

Roland Christen
 

In a message dated 4/16/2007 1:56:56 PM Central Daylight Time,
dpersyk@att.net writes:


Images, associated data and imaging notes at
http://home.att.net/~dpersyk/new.htm
Thanks for posting these images. If it's clear I might try imaging this
object in the next couple days.


This is my first image of 2007. I've been spending time on another
hobby – an indoor, non-weather-dependent hobby <G>. See
http://home.att.net/~dpersyk/horr.htm
Cool indeed!

Rolando


**************************************
See what's free at
http://www.aol.com.


[Non-text portions of this message have been removed]


Re: Mach 1 GTO load capacity

Roland Christen
 

In a message dated 4/15/2007 9:38:41 AM Central Daylight Time,
Skyloverz@aol.com writes:


Do you believe the Mach 1 gto can hold ~ 55 lbs and maintain it's
tracking accuracy ?
Weight won't change the tracking accuracy. It is more a matter of stability
in the wind with heavy weights and large tubes catching the breeze.


I'm dreaming of a SMALLER set-up than I have right now to include
a uhhh mmm Takahaachoo E 180 ED and IMG 6303 cam with 78 mm guide
scope...pretty compact but with rings,plates, cams..
is about 55 lbs.
Won't really know until you try it. For that you would need to come over and
bring the equipment.

Rolando


**************************************
See what's free at
http://www.aol.com.


Re: Appropriate dec backlash setting?

Roland Christen
 

In a message dated 4/15/2007 2:32:56 PM Central Daylight Time,
brian_clever@yahoo.com writes:


Hello friends. I'm getting my AP900 with 12" LX200R tuned up
nicely finally. I found that setting my dec backlash to 7
achieved the best results.
That is very high and indicates that you need to put the Dec worm into mesh.
You should also check to make sure that the final spurgear is tight on the
worm shaft and is not rotating slightly when it reverses. If it id not tight,
then tighten the setscrew that holds it onto the worm shaft.

Roland Christen


**************************************
See what's free at
http://www.aol.com.


Re: mirror flop on a celestron c 9.25

lupodima <lupo.di.mare@...>
 

Hi Georgio,

Is there any chance that the weight of the Pentax is causing the OTA to
sag or shift , depending on the mount position? If you use an
autoguider, on a
different finder than the OTA, it might try to compensate the sag,
incorrectly. Everything on the plate has to be tight, flex free.

Joe

------------------------------------------------------------------------

Hi Joe
I think about and had removed the Pentax sdhf 75 from the c9 but i
still have this problem.
Anyway the rings and the losmandy dovetail on the Pentax was firmly
blocked.
at this point i hope who i have only an error of orthogonality of the
OTA in one direction ( i mean up and down so i can fight with shimming
the ota) and not in right left
cheers
Giorgio


Re: mirror flop on a celestron c 9.25

Joe Zeglinski
 

Hi Georgio,

Is there any chance that the weight of the Pentax is causing the OTA to
sag or shift , depending on the mount position? If you use an autoguider, on a
different finder than the OTA, it might try to compensate the sag,
incorrectly. Everything on the plate has to be tight, flex free.

Joe

----- Original Message -----
From: "lupodima" <lupo.di.mare@virgilio.it>
To: <ap-gto@yahoogroups.com>
Sent: Sunday, April 15, 2007 3:12 PM
Subject: [ap-gto] Re: mirror flop on a celestron c 9.25


Hi Tom thanks for your input
Sorry to all the users here but i make a error i post on the group
rather than send a email to Mr John .
Anyway , Tom , is intresting the focuser and i will check it !
The mount 900 gto is perfectly orthogonal but this commercial OTA have
some problems.... first of all i have measured whit a digital calliper
the thickness of the corrector ring and the rear cell ring ( primary
mirror ) and the difference is almost 2 mm (0,079 inch )...i have
shimmed the ota with some piece of soda can (coca cola) .But following
the istruction for check the orthogonality issue from the 900 gto
manual t(the meridian delay) i have still a noticeable error and of
course the quality of goto is very low ...
For focusing i have a Microfocuser analog pc who is very precise and
is fully controllable remotely from my PC thru ascom driver
I have 2 losmandy dovetail one for match the OTA to the 900 gto and
another (the equal model) as accessory tray (now i have on a Pentax
sdhf 75 with 2 rings to grab it).
The advice of mr John is very intresting ,because is possible to do it
without disassemble the c9 totally ....you can find it here :
http://tech.groups.yahoo.com/group/ap-gto/message/5619

thanks again
Cheers
Giorgio



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see http://groups.yahoo.com/group/ap-gto
Yahoo! Groups Links




Appropriate dec backlash setting?

brian_clever <brian_clever@...>
 

Hello friends. I'm getting my AP900 with 12" LX200R tuned up
nicely finally. I found that setting my dec backlash to 7
achieved the best results. Is that high or is that about right?
To get an idea of the load on my system I needed 64 lbs of
counterweights to balance the OTA, guide scope, TCF-S focuser and
STL-11K.

Regards,
Brian C.


Re: mirror flop on a celestron c 9.25

lupodima <lupo.di.mare@...>
 

Hi Tom thanks for your input
Sorry to all the users here but i make a error i post on the group
rather than send a email to Mr John .
Anyway , Tom , is intresting the focuser and i will check it !
The mount 900 gto is perfectly orthogonal but this commercial OTA have
some problems.... first of all i have measured whit a digital calliper
the thickness of the corrector ring and the rear cell ring ( primary
mirror ) and the difference is almost 2 mm (0,079 inch )...i have
shimmed the ota with some piece of soda can (coca cola) .But following
the istruction for check the orthogonality issue from the 900 gto
manual t(the meridian delay) i have still a noticeable error and of
course the quality of goto is very low ...
For focusing i have a Microfocuser analog pc who is very precise and
is fully controllable remotely from my PC thru ascom driver
I have 2 losmandy dovetail one for match the OTA to the 900 gto and
another (the equal model) as accessory tray (now i have on a Pentax
sdhf 75 with 2 rings to grab it).
The advice of mr John is very intresting ,because is possible to do it
without disassemble the c9 totally ....you can find it here :
http://tech.groups.yahoo.com/group/ap-gto/message/5619

thanks again
Cheers
Giorgio


Re: mirror flop on a celestron c 9.25

T.A. Meneghini <t.tamen@...>
 

Giorgio,

I am also an owner of a C9.25. Most of your problem is, obviously,
orthogonality of the telescope and mount. If you believe there is a residual
problem from mirror flop, there is a product that will help minimize (but
not eliminate entirely) the effect. It is a Hutech focuser lock. This is not
a mirror lock, but a mechanism that replaces your SCT focus knob. It employs
a long set screw through the knob that is used to lock the internal focus
mechanism. I've found that it removes about 80% of the mirror flop in my
C9.25. The unit sells for about $55.00 US.

Best regards,
Tom Meneghini

-----Original Message-----
From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com] On Behalf Of
lupodima
Sent: Sunday, April 15, 2007 8:38 AM
To: ap-gto@yahoogroups.com
Subject: [ap-gto] mirror flop on a celestron c 9.25



Hello John
i read the your post on astrophysics yahoo group regarding the
adjustment of your Celestron c11 mirror flop
here the link were i read your intresting advice
http://tech.
<http://tech.groups.yahoo.com/group/ap-gto/messages/5619?threaded=1&m=e&var=
1&tidx=1>
groups.yahoo.com/group/ap-gto/messages/5619?threaded=1&m=e&var=1&tidx=1

I have 900 gto cp3 from astrophysics and my Celestron c9.25 have a
very large error in orthogonality as well mirror flop
i read also your pdf downloaded from your site
and i will try your advice (seem to be not to much difficult)
Have you upgraded this advice or i can follow your pdf litterally ?
i have to dissassemble my c9.25 and i think is the same way of a c 11 ...
when i told about the orthogonality error i mean if i point to Vega
and then point on a star on the other side of the meridian i notice
the error also in the finderscope ( 9x60 )who is attached on the main
OTA c9.25
i have shimmed it but with a lot of piece soda can i havent get the
good result

thanks for your precious advice
im waiting for your responce
my best regards
Giorgio Ospici
Italy

my email address is
lupo.di.mare@ <mailto:lupo.di.mare%40virgilio.it> virgilio.it


Re: Photos of dueling AP900GTOs

primeclash
 

--- In ap-gto@yahoogroups.com, "Joseph Zeglinski" <J.Zeglinski@...> wrote:

Hi Louis,
If so, I did download JAVA form Sun, and have been running it
with a lot
of website scripts, without this error. I believe Microsoft withdrew
their
JAVA in XP SP1A.
Anyway, the SUN JAVA processor seems to work fine, even in IE7 -
but this
one website seems different.
That's because Java is NOT JavaScript. JavaScript is a client-side
language which runs in your browser and is not from Sun. Java is a
full-blown programming language which can create applets that run in a
browser, but that's not the same thing.

Microsoft withdrew their "version" of the Java runtime after they, you
guessed it, got sued by Sun for changing the way Java works to suit them.

I hope this is helpful.

Regards,
Louis Marchesi


Re: Safely installing a heavy OTA onto an AP900

blandp11
 

I have an AP 900GTO mount on the 54" pier and use it (mostly) with my
TEC APO180FL refractor. The 180FL weighs in at 36.5lbs. I first put
the rings on the mount without the scope in the rings with the rings
open. I then carefully place the OTA in the rings, and close the
rings one handed one at a time with the other hand on the OTA, just in
case. Works well for me.

This OTA is the limit of what I would want to comfortably lift alone,
but it is not hard to do. My 160EDF at 28lbs was, by comparison,
easier to manage. The difference is that with the 180FL I have to be
thinking about nothing but putting the OTA on the mount, while the
160EDF didn't require ones "full" attention to do the same.


Philip


Mach 1 GTO load capacity

Bruce Karbal <Skyloverz@...>
 

Rolland,

Do you believe the Mach 1 gto can hold ~ 55 lbs and maintain it's
tracking accuracy ?

I'm dreaming of a SMALLER set-up than I have right now to include
a uhhh mmm Takahaachoo E 180 ED and IMG 6303 cam with 78 mm guide
scope...pretty compact but with rings,plates, cams..
is about 55 lbs.

Vhat do you tink ?

Brooze


Re: Photos of dueling AP900GTOs

Joe Zeglinski
 

Hi Louis,
If so, I did download JAVA form Sun, and have been running it with a lot
of website scripts, without this error. I believe Microsoft withdrew their
JAVA in XP SP1A.
Anyway, the SUN JAVA processor seems to work fine, even in IE7 - but this
one website seems different.

Oh well, I'm glad to finally see the scopes an the sky sheds.

Joe

----- Original Message -----
From: "Louis Marchesi" <lmarchesi@yahoo.com>
To: <ap-gto@yahoogroups.com>
Sent: Saturday, April 14, 2007 9:01 PM
Subject: [ap-gto] Re: Photos of dueling AP900GTOs


--- In ap-gto@yahoogroups.com, "Joseph Zeglinski" <J.Zeglinski@...> wrote:

Something else: every time I click on any selection on your pages,
IE7 gives
me a warning:
"Click to run an ActiveX Control on this page".
It doesn't matter what I click on. I haven't had this happen before.
Perhaps you can look into that problem.
Microsoft was sued, and lost, by a company named Eolas that patented
the technology used by your browser to render media players and the
like (in any web page). Microsoft refused to pay the royalties, and
instead went with a workaround, wherein the necessary HTML is added
not directly to the web page, but by using external Javascript.

I think that's detailed enough for an astronomy forum :-) We now
resume our regularly scheduled overcast evening ...

Regards,
Louis Marchesi




To UNSUBSCRIBE, or for general information on the ap-gto list
see http://groups.yahoo.com/group/ap-gto
Yahoo! Groups Links




Re: Photos of dueling AP900GTOs

primeclash
 

--- In ap-gto@yahoogroups.com, "Joseph Zeglinski" <J.Zeglinski@...> wrote:

Something else: every time I click on any selection on your pages,
IE7 gives
me a warning:
"Click to run an ActiveX Control on this page".
It doesn't matter what I click on. I haven't had this happen before.
Perhaps you can look into that problem.
Microsoft was sued, and lost, by a company named Eolas that patented
the technology used by your browser to render media players and the
like (in any web page). Microsoft refused to pay the royalties, and
instead went with a workaround, wherein the necessary HTML is added
not directly to the web page, but by using external Javascript.

I think that's detailed enough for an astronomy forum :-) We now
resume our regularly scheduled overcast evening ...

Regards,
Louis Marchesi


Re: Photos of dueling AP900GTOs

Joe Zeglinski
 

Thanks Ruben,

The blue background works. Now I can read your info.
Something else: every time I click on any selection on your pages, IE7 gives
me a warning:
"Click to run an ActiveX Control on this page".
It doesn't matter what I click on. I haven't had this happen before.
Perhaps you can look into that problem.
What browser are you running? Some of the code may be missing a default, or
gets called too often.

Joe

----- Original Message -----
From: "stardoctor5" <stardoctor5@yahoo.com>
To: <ap-gto@yahoogroups.com>
Sent: Saturday, April 14, 2007 4:02 PM
Subject: [ap-gto] Re: Photos of dueling AP900GTOs


Dear Joe and Murry,
I found this line in the help section of my web software:
"Some web browsers can understand only hexadecimal colors. If you're
using an unusual color that your browser can't decode, your browser
will replace your background color with a color it does understand."
So, I have changed to a simpler color, that I hope now allows for
better reading. If you can confirm that the dark blue background is
now visible, I can begin the tedious task of updating my hundred or
so web pages.

Ruben

--- In ap-gto@yahoogroups.com, "Joseph Zeglinski" <J.Zeglinski@...>
wrote:

Nice pics,

But the text at bottom of first image is yellow - unreadable

Joe
----- Original Message -----

Dear Group,

I have updated my images on my Observatory web page. Scroll down
to
the bottom and you can see my dual AP900s.

http://www.stardoctor.org/lake.html

Latest images accessible from my home page

http://www.stardoctor.org/index.html

Ruben



To UNSUBSCRIBE, or for general information on the ap-gto list
see http://groups.yahoo.com/group/ap-gto
Yahoo! Groups Links




Re: Photos of dueling AP900GTOs

Robin Kerr
 

Dear Joe and Murry,
I found this line in the help section of my web software:
"Some web browsers can understand only hexadecimal colors. If you're
using an unusual color that your browser can't decode, your browser
will replace your background color with a color it does understand."
So, I have changed to a simpler color, that I hope now allows for
better reading. If you can confirm that the dark blue background is
now visible, I can begin the tedious task of updating my hundred or
so web pages.

Ruben

--- In ap-gto@yahoogroups.com, "Joseph Zeglinski" <J.Zeglinski@...>
wrote:

Nice pics,

But the text at bottom of first image is yellow - unreadable

Joe
----- Original Message -----

Dear Group,

I have updated my images on my Observatory web page. Scroll down
to
the bottom and you can see my dual AP900s.

http://www.stardoctor.org/lake.html

Latest images accessible from my home page

http://www.stardoctor.org/index.html

Ruben


Re: Photos of dueling AP900GTOs

Woodwind
 

I had the same problem with the text - and we are on the fastest DSL as well. I got around the problem by highlighting the text with the cursor and reading white on blue - not ideal but it worked.

Murray

Joseph Zeglinski <J.Zeglinski@rogers.com> wrote: Ruben,
Everything is fine - even the music. I was trying to read the paragraph at
the bottom, but "yellow text" on the white background, made it unreadable.

I'm using high speed internet cable, and IE7, with no AOL connection.
Maybe Netscape or other browsers don't have a problem here?

Just a head up.

Joe

----- Original Message -----
From: "stardoctor5" <stardoctor5@yahoo.com>
To: <ap-gto@yahoogroups.com>
Sent: Friday, April 13, 2007 10:35 PM
Subject: [ap-gto] Re: Photos of dueling AP900GTOs

> Joe,
> some internet portals employ data compression that eliminates
> backgrounds, especially with dialup services or slower DSL lines. My
> background is blue swirl. So, you may be in a compression mode.
> AOL blocks my music and sometimes even my background if you use the
> AOL for login, but you can hear the music if you go directly to the
> internet.
>
> Ruben-






---------------------------------
Ahhh...imagining that irresistible "new car" smell?
Check outnew cars at Yahoo! Autos.


Re: Photos of dueling AP900GTOs

Joe Zeglinski
 

Ruben,
Everything is fine - even the music. I was trying to read the paragraph at
the bottom, but "yellow text" on the white background, made it unreadable.

I'm using high speed internet cable, and IE7, with no AOL connection.
Maybe Netscape or other browsers don't have a problem here?

Just a head up.

Joe

----- Original Message -----
From: "stardoctor5" <stardoctor5@yahoo.com>
To: <ap-gto@yahoogroups.com>
Sent: Friday, April 13, 2007 10:35 PM
Subject: [ap-gto] Re: Photos of dueling AP900GTOs


Joe,
some internet portals employ data compression that eliminates
backgrounds, especially with dialup services or slower DSL lines. My
background is blue swirl. So, you may be in a compression mode.
AOL blocks my music and sometimes even my background if you use the
AOL for login, but you can hear the music if you go directly to the
internet.

Ruben-


Re: Safely installing a heavy OTA onto an AP900

Joe Zeglinski
 

Hi Mal,

Thanks for the info,

I went through the AP accessory list, and came across Roland's
justification, as you describe. The DOVEM2 is a nice design because as you
say - simply set the dovetail horizontal and flip the matching plate into it's
bottom edge, lock the knobs. However, I think there is also a "design flaw"
in the manufacture.

O.K. - please forgive this bravado, from a total newbie, however, I have
just attached the DOVEM2 dovetail and noticed what seems a bit of a problem -
not a deal breaker, but certainly an inconvenience.

I attached the DOVEM2 with the "offset hole pattern", such that it sits
higher up on the face of the DEC end face, so that the approx. one inch of
excess moment will be "towards the front of the MAK/SCT OTA (which is mirror
end heavy). If I were to flip the DOVEM2 around 180 degrees, the off centre
hole patter, would be towards the back of an SCT,, making the mirror end
moment even worse, and thus decreasing the adjustment range of the mating
plate, before it slips out of the bottom end, lock knob. I know, it could be
moved to a centre hole, but that would make the DOVEM2 effectively half
length, and the OTA "rocky".

I hope I am being clear, so far. Surely, those with SCT's must be aware of
this situation.
Please bear with me.

The bad news, if the DOVEM2 is bolted in, high up, as I started to
describe, and you then set it horizontal in preparation to receive your SCT
and plate, the lock knobs are now along the bottom edge. Also, the bottom
V-groove where you will drop the plate into for first contact is actually a
shallow, milled down channel (not a full notch, like the other side). So
basically, the SCT's mating plate edge is initially resting on just two
points - the two brass locking pins. As you then tip the horizontal SCT up, to
be fully inside the DOVEM2 channels, you must now screw the two locking knobs
"upward" against the entire weight of the SCT.
Note: I am intentionally not talking about a "refractor", here. This is an
awkward way of installing a mirror end heavy SCT or a MAK like a Questar-7,
correct?

The only other way to make this still viable, is to rotate the DOVEM2
"counter clockwise" instead, so that the knobs will be along the top, and you
will dip the SCT plate into the other, FULL V-groove, which now is along the
bottom edge. This is almost perfect, since after you tip the SCT into the
DOVEM2 surface, the lock knobs are loose, and can easily be screwed downward,
into a full lock, while the SCT's dovetail plate fully occupies the full
V-groove.

Perfect ... right?

Not quite. The problem in making this compromise - rotating the high
bolted DOVEM2 counter clockwise, is that you first have to remove your very
heavy SCT (C9) or a MAK (like my Q7), from the transport case, and flip it
around "hand over hand" (end to end), so it is facing now LEFT.

Problem is - my Q7 sits in it's case "facing right", and I suspect that
all telescopes, are placed in their travel cases with the objective or
corrector lens facing to the RIGHT. The alternative, to avoid hand over hand
flipping of a heavy scope, is to bend over from behind and over, the case lid,
and lift it out that way, backwards - back killer!

The solution:
Roland should have drilled a third "4-hole pattern", in the opposite
direction, relative to DOVEM2 centre. That way, everything I have meticulously
described above, will work correctly, with the lock knobs at the top, and the
SCT lifted from it's case, facing to the right, as you install it, and the
DOVEM2 dovetail will no longer be back end heavy, giving you more room to
shift the SCT balance in the saddle. We can't sacrifice any loss of adjustment
position for SCT's, because there will also be heavy eyepieces, and possibly
cameras, making things even worse for loss of adjustment range.

Looks like I am going to need a machine shop to drill 4 more holes in the
standard DOVEM2, for use with SCT's and MAK's.

I think that Roland may have chosen the "current direction" for the offset
hole pattern, is because he was thinking of AP "refractors", which are lens
end, forward heavy, and the DOVEM2 being eyepiece end heavy, provided more
latitude for adjusting a refractor's balance point.

As I said - I may be WAY OFF on this, since I haven't had my AP900 fully
configured, but at this point, the DOVEM2 seems not to be particularly made
very well for it. Certainly, it makes mounting an SCT inconvenient.

Fortunately, this can be easily remedied on future DOVEM2 production, by
simply drilling one more 4-hole mount pattern, on the opposite side of centre.

Perhaps, you or someone else in the group can explain if I am totally
mistaken. Your experience with the DOVEM2 will be much better than mine.
Certainly, after an evening of playing with the DOVEM2, to see how it will
seat itself on the end of the DEC axis, and how I would lift up my heavy MAK
OTA, I can see no easy procedure.

Please comment, and save me a trip to a machine shop. I hope I have explained
myself fairly clearly, above. Sorry for such a long post.

Thanks,
Joe

----- Original Message -----
From: "Mal Speer" <mal@malcoprecision.com>
To: <ap-gto@yahoogroups.com>
Sent: Friday, April 13, 2007 10:02 PM
Subject: [ap-gto] Re: Safely installing a heavy OTA onto an AP900


AP and Cassidy both make newer upgraded saddles with a much better
locking system using two large knobs. The reason for only a dovetail
on one side is that that is a tip in saddle. You don't have to slide
a heavy scope in from the end, just tip the scope into the dovetail
drop it down and lock it in.
Mal