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Re: Polar Alignment Scope /G-11


Apr 20, 2006

 


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

#29515 Apr 20, 2006

Recently purchased a 3 year old G-11. Use it with a TEC 140 and SV80 w/

SBIG STV autoguider. I can get all 3 stars in the polarscope and don't

touch the mount. After 30 min I you look in the polarscope again-

should you be able to still align all 3 stars by rotating the

polarscope. When I do this, polaris is on but the other 2 stars are

off?



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

#29518 Apr 20, 2006

There's 2 possibilities: First, the scope may not be orthagonal with the polar axis.

Second, you may be slightly off target. 10-15 arc minutes of error is not uncommon in a polar scope, although with practice you should be able to get within 5 minutes.



Either of these situations will probably result in the results you got when you rotated the tube. I personally almost always do ccd so I find that the polar scope just isn't enough.



Tom P.



-------------- Original message --------------

From: "kroral" kroral@...>

Recently purchased a 3 year old G-11. Use it with a TEC 140 and SV80 w/

SBIG STV autoguider. I can get all 3 stars in the polarscope and don't

touch the mount. After 30 min I you look in the polarscope again-

should you be able to still align all 3 stars by rotating the

polarscope. When I do this, polaris is on but the other 2 stars are

off?











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

#29522 Apr 20, 2006

--- In Losmandy_users@yahoogroups.com, "kroral" kroral@...> wrote: >

> Recently purchased a 3 year old G-11. Use it with a TEC 140 and SV80

w/ > SBIG STV autoguider. I can get all 3 stars in the polarscope and

don't > touch the mount. After 30 min I you look in the polarscope again-

> should you be able to still align all 3 stars by rotating the

> polarscope. When I do this, polaris is on but the other 2 stars are

> off?

>

Thanks for the info.



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

#29527 Apr 20, 2006

--- In Losmandy_users@yahoogroups.com, tpicciani@... wrote: >

> There's 2 possibilities: First, the scope may not be orthagonal

with the polar axis.



I assume you're referring to the scope dec axis when you say "scope

axis" but actually, it's totally irrelevant whether or not the dec

axis is orthogonal to the polar axis when doing a polar alignment.

The scope itself doesn't even need to be mounted.

> Second, you may be slightly off target. 10-15 arc minutes of error

is not uncommon in a polar scope, although with practice you should

be able to get within 5 minutes.



Yes, it's possible that you may not be closely polar aligned to

start with, or that you've lost polar alignment after using the

mount. You could start with checking to see of the mount is sinking

into the ground, or that the G11 head is tightly screwed to the

pier, etc.



Bryan

>

> Either of these situations will probably result in the results you

got when you rotated the tube. I personally almost always do ccd so

I find that the polar scope just isn't enough. >

> Tom P.

>

> -------------- Original message --------------

> From: "kroral" kroral@...>

> Recently purchased a 3 year old G-11. Use it with a TEC 140 and

SV80 w/ > SBIG STV autoguider. I can get all 3 stars in the polarscope and

don't > touch the mount. After 30 min I you look in the polarscope again-

> should you be able to still align all 3 stars by rotating the

> polarscope. When I do this, polaris is on but the other 2 stars

are > off?

>

>

>

>

>

> SPONSORED LINKS Astronomy telescope Tube assembly

>

>

>

> YAHOO! GROUPS LINKS

>

> Visit your group "Losmandy_users" on the web.

>

> To unsubscribe from this group, send an email to:

> Losmandy_users-unsubscribe@yahoogroups.com

>

> Your use of Yahoo! Groups is subject to the Yahoo! Terms of

Service. >

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

>



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

#29530 Apr 21, 2006

--- In Losmandy_users@yahoogroups.com, "ttoadler2000" bputnam@...>

wrote: >

> --- In Losmandy_users@yahoogroups.com, tpicciani@ wrote:

> >

> > There's 2 possibilities: First, the scope may not be orthagonal

> with the polar axis.

>

> I assume you're referring to the scope dec axis when you say "scope

> axis" but actually, it's totally irrelevant whether or not the dec

> axis is orthogonal to the polar axis when doing a polar alignment.

> The scope itself doesn't even need to be mounted.

>

> > Second, you may be slightly off target. 10-15 arc minutes of

error > is not uncommon in a polar scope, although with practice you should

> be able to get within 5 minutes.

>

> Yes, it's possible that you may not be closely polar aligned to

> start with, or that you've lost polar alignment after using the

> mount. You could start with checking to see of the mount is sinking

> into the ground, or that the G11 head is tightly screwed to the

> pier, etc.

>

> Bryan

>

> >

> > Either of these situations will probably result in the results

you > got when you rotated the tube. I personally almost always do ccd so

> I find that the polar scope just isn't enough.

> >

> > Tom P.

> > Well- The mount is on concrete and the head was screwed on tight.

The dec axis was also adjusted from the bottom up-so the play in the

dec axis adjustment would not drop.

Bruce R. > > -------------- Original message --------------

> > From: "kroral" kroral@>

> > Recently purchased a 3 year old G-11. Use it with a TEC 140 and

> SV80 w/

> > SBIG STV autoguider. I can get all 3 stars in the polarscope and

> don't

> > touch the mount. After 30 min I you look in the polarscope again-

> > should you be able to still align all 3 stars by rotating the

> > polarscope. When I do this, polaris is on but the other 2 stars

> are

> > off?

> >

> >

> >

> >

> >

> > SPONSORED LINKS Astronomy telescope Tube assembly

> >

> >

> >

> > YAHOO! GROUPS LINKS

> >

> > Visit your group "Losmandy_users" on the web.

> >

> > To unsubscribe from this group, send an email to:

> > Losmandy_users-unsubscribe@yahoogroups.com

> >

> > Your use of Yahoo! Groups is subject to the Yahoo! Terms of

> Service.

> >

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

> >

>







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