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Re: [rasc-memlist] RASC Dark Sky Event - Carp Star Party Saturday Sept 17th

 

Everyone,



I have already received a ? dozen e-mails from the public inquiring if the
star party will go ahead. We can expect a huge turn-out.



We have also started advertising the Carp star parties in some of the weekly
newspapers – EMC, Metro. This is on top of the promotion that Gary Boyle
does. He pings his TV & Radio contacts (50+ contacts).



Weather-permitting, we’ll see a lot of people.



Mike

RASC, Ottawa Centre, Public Outreach







From: rasc-memlist-bounces@...
[mailto:rasc-memlist-bounces@...] On Behalf Of Stephen J
McIntyre
Sent: Wednesday, September 14, 2011 3:40 PM
To: zz_OAFsMailingList; zz_RASCMailingList; zz_RASCMailingList
Subject: [rasc-memlist] RASC Dark Sky Event - Carp Star Party Saturday Sept
17th



The September RASC Dark Sky Star Party is planned for this Saturday Sept
17th at the Carp Library. More info and final go-noGo status at:


ies_for_2011



Those bringing telescopes should plan to be setup and ready to go for 8:30pm
and we'll run until 1am.



Sunset is about 7:28pm while astronomical twilight starts at about 9:08pm
(basically as dark as its going to get). However, it will be dark enough to
see some bright stars and pick out constellations at about 8:30pm.



Venus sets at 7:35pm and is only 8deg behind the Sun. But at mag 3.91 you
might have a chance to see it a few minutes after sunset. Saturn, mag 0.8,
sets at 8:08pm so is basically gone for the season. But the Saturn Nebula
(NGC7009) is high in the sky at 11pm. As is Neptune.



The moon does rise at a little after 9pm but shouldn't interfere with Dark
Sky Objects (DSOs) until well after midnight. At that time Jupiter will also
be low in the east.



Comet Garradd (2009/p1) is high in the east between Aquila and Hercules
(j2000 RA 18h 37m 19s, Dec 19d 52' 08"). At an estimated magnitude of 8, the
core is quite visible although the tail is not.



No green laser points please.

The Carp Airport is just a few kilometers south of the Carp Library. The
Transport Canada regulations and RASC policy is not use green laser pointers
this close to an airport. So please leave the green lasers at home.



Stephen <>

, <mailto:%20smcintyre@...> mailto: smcintyre@...

Astro photos: www.flickr.com/McIntyre_SJ

Astronomy Info: <>
www.DenholmObservatory.ca



[Non-text portions of this message have been removed]
Re: Jupiter Sept 11 2011 - good seeing

 

Really nice.

What camera are you using these days? (And acquisition software, etc.)

Thanks,

Andre

--- In OAFs@..., "Rr" <cometwatch@...> wrote:

Here's another one from a little earlier, and the colours not quite as saturated:



-Rolf



--- In OAFs@..., "Rr" <cometwatch@> wrote:

Seeing wasn't quite as good as advertised, but not too bad. Here is Jupiter from this morning. I took many captures, this being the last one. I don't know if it will be the best.



-Rolf
Re: Monichrome version of Jupiter with 4 moons

 

Nice image!

--- In OAFs@..., "Stephen" <mcintyre_sj@...> wrote:

Here's my best yet Jupiter - despite the lack of colour.


This was taken at 5:43am on 2011-09-11. I just happened to be up and noticed that Jupiter was still high in the sky. And knowing the seeing was supposed to be excellent, i decided to try imaging Jupiter.
Re: RASC Dark Sky Event - Carp Star Party Saturday Sept 17th

 

Hi Stephen,

The weather is looking great for this. I was just looking at the weather models and there's virtually no chance of cloud cover for the entire weekend!

I hope to see a big crowd on Saturday night!!!

- Pierre

--- In OAFs@..., Stephen J McIntyre <mcintyre_sj@...> wrote:

The September RASC Dark Sky Star Party is planned for this Saturday Sept 17th at the Carp Library. More info?and final go-noGo status at:

?
Those bringing telescopes should plan to be setup and ready to go for 8:30pm and we'll run until 1am. ?
?
Sunset is about 7:28pm while astronomical twilight starts at about 9:08pm (basically as dark as its going to get). However, it will be dark enough to see some bright stars and pick out constellations at about 8:30pm.
?
Venus sets at 7:35pm and is only 8deg behind the Sun. But at mag 3.91 you might have a chance to see it?a few minutes?after sunset. Saturn, mag 0.8, sets?at 8:08pm?so is basically gone for the season.?But the Saturn Nebula (NGC7009) is high in the sky at 11pm. As is Neptune.
?
The moon does rise at a little after 9pm but shouldn't interfere with Dark Sky Objects (DSOs) until well after midnight. At that time Jupiter will also be low in the east.
?
Comet Garradd (2009/p1) is high in the east between Aquila and Hercules (j2000 RA 18h 37m 19s, Dec 19d 52' 08"). At an estimated magnitude of 8, the core is quite visible although the tail is not.
?
No green laser points please.
The Carp Airport is just a few kilometers south of the Carp Library. The Transport Canada regulations and RASC policy is not use green laser pointers this close to an airport. So please leave the green lasers at home.
Stephen
,mailto: smcintyre@...
Astro photos: www.flickr.com/McIntyre_SJ
Astronomy Info: www.DenholmObservatory.ca

[Non-text portions of this message have been removed]
RASC Dark Sky Event - Carp Star Party Saturday Sept 17th

 

The September RASC Dark Sky Star Party is planned for this Saturday Sept 17th at the Carp Library. More info?and final go-noGo status at:

?
Those bringing telescopes should plan to be setup and ready to go for 8:30pm and we'll run until 1am. ?
?
Sunset is about 7:28pm while astronomical twilight starts at about 9:08pm (basically as dark as its going to get). However, it will be dark enough to see some bright stars and pick out constellations at about 8:30pm.
?
Venus sets at 7:35pm and is only 8deg behind the Sun. But at mag 3.91 you might have a chance to see it?a few minutes?after sunset. Saturn, mag 0.8, sets?at 8:08pm?so is basically gone for the season.?But the Saturn Nebula (NGC7009) is high in the sky at 11pm. As is Neptune.
?
The moon does rise at a little after 9pm but shouldn't interfere with Dark Sky Objects (DSOs) until well after midnight. At that time Jupiter will also be low in the east.
?
Comet Garradd (2009/p1) is high in the east between Aquila and Hercules (j2000 RA 18h 37m 19s, Dec 19d 52' 08"). At an estimated magnitude of 8, the core is quite visible although the tail is not.
?
No green laser points please.
The Carp Airport is just a few kilometers south of the Carp Library. The Transport Canada regulations and RASC policy is not use green laser pointers this close to an airport. So please leave the green lasers at home.
Stephen
,mailto: smcintyre@...
Astro photos: www.flickr.com/McIntyre_SJ
Astronomy Info: www.DenholmObservatory.ca

[Non-text portions of this message have been removed]
Re: Jupiter Sept 11 2011 - good seeing

 

Here's another one from a little earlier, and the colours not quite as saturated:



-Rolf

--- In OAFs@..., "Rr" <cometwatch@...> wrote:

Seeing wasn't quite as good as advertised, but not too bad. Here is Jupiter from this morning. I took many captures, this being the last one. I don't know if it will be the best.



-Rolf
Re: Monichrome version of Jupiter with 4 moons

Bruce
 

On September 12, 2011 04:03:33 PM you wrote:
Here's my best yet Jupiter - despite the lack of colour.


This was taken at 5:43am on 2011-09-11. I just happened to be up and
noticed that Jupiter was still high in the sky. And knowing the seeing was
supposed to be excellent, i decided to try imaging Jupiter.
Very nice. Colour is not always required to appreciate a good picture.

--
Bruce
Member: IEEE, SPIE, IACR
Faintfuzzies.ca
Re: Collimation & cooling

balticbirch
 

Thanks, Bob. Attilla was kind enough to offer to help me as well.

-Tony.

--- In OAFs@..., "Bob Olson" <r.olson@...> wrote:

Hi Tony,

A 20 inch Starmaster!! I am not too jealous. I suppose you have a complete set of Ethos eyepieces to go with it!

There are many members of this list who can help you with collimation but Attilla gave me my lessons and explained all the steps clearly and without too much sarcasm about my lack of knowledge. See if you can con him into a collimation demonstration.

Have a great day.
Bob

[Non-text portions of this message have been removed]
Re: Collimation & cooling

balticbirch
 

Thanks for the great info, Attilla. I'll try to make it to Carp on the 17th.

-Tony.

--- In OAFs@..., "Attilla" <attilladanko@...> wrote:

Idiot at the keyboard. Right. Here are some corrected sentences:

--- In OAFs@..., "Attilla" <attilladanko@> wrote:

But I can use a sight-tube.
But I *can't use a sight-tube.




If you're sucking air out of the tube, I suggest a big a fan (or as >many fans) as you can get. The key in this case is to seal the >bottom of the tube so the fan(s) dosent(dont) use suction.
bottom of the tube so the fans don't *loose* suction.


And I should have added:

You need to suck a heck of a lot of air out of the bottom of a tube to have same affect against blowing at the back of the mirror.

However, sucking cools the mirror without distorting its figure. (Back-blowing fans can cause a local cool spot). Also, enough suction will suck some of the turbulent boundary layer off the front of the mirror making them almost as good as boundry-layer fans.



It hink filtering is especially important in this case.
I *think* filtering is especially important int his case (of boundary layer fans blowing across the mirror face).

I need to hire a proof reader
Re: Monichrome version of Jupiter with 4 moons

 

Beautiful.

--- In OAFs@..., "Stephen" <mcintyre_sj@...> wrote:

Here's my best yet Jupiter - despite the lack of colour.


This was taken at 5:43am on 2011-09-11. I just happened to be up and noticed that Jupiter was still high in the sky. And knowing the seeing was supposed to be excellent, i decided to try imaging Jupiter.
Re: pier construction

 

If anyone in the Ottawa area is thinking of making a concrete telescope pier, I have a 6 foot length of high quality 14 inch diameter concrete form to go to a good home. I had to buy a twelve foot length and cut in in half.

If anyone is amused by the efforts and results of amateur construction, I put a photo blog on my website:



Tony

astrophotography and fine mineral photography:
Re: Collimation & cooling

 

.....at least you didn't type "poop reader"....LOL
On 2011-09-12, at 7:16 PM, "Attilla" <attilladanko@...> wrote:

Idiot at the keyboard. Right. Here are some corrected sentences

I need to hire a proof reader


[Non-text portions of this message have been removed]
Re: Collimation & cooling

 

Hmmmmmmm.....who is the guy with the $gazzillion Astro-Physics mount? I can't remember his name BOB.
On 2011-09-12, at 5:46 PM, "Bob Olson" <r.olson@...> wrote:

Hi Tony,

A 20 inch Starmaster!! I am not too jealous. I suppose you have a complete set of Ethos eyepieces to go with it!

There are many members of this list who can help you with collimation but Attilla gave me my lessons and explained all the steps clearly and without too much sarcasm about my lack of knowledge. See if you can con him into a collimation demonstration.

Have a great day.
Bob




[Non-text portions of this message have been removed]
Re: Monichrome version of Jupiter with 4 moons

Attilla Danko
 

Nice detail. And little spherical gallean moons. Tasty.

On Mon, Sep 12, 2011 at 16:03, Stephen <mcintyre_sj@...> wrote:

**


Here's my best yet Jupiter - despite the lack of colour.


This was taken at 5:43am on 2011-09-11. I just happened to be up and
noticed that Jupiter was still high in the sky. And knowing the seeing was
supposed to be excellent, i decided to try imaging Jupiter.




--
attilla danko, danko@...,


[Non-text portions of this message have been removed]
Re: Collimation & cooling

Attilla
 

Idiot at the keyboard. Right. Here are some corrected sentences:

--- In OAFs@..., "Attilla" <attilladanko@...> wrote:

But I can use a sight-tube.
But I *can't use a sight-tube.




If you're sucking air out of the tube, I suggest a big a fan (or as >many fans) as you can get. The key in this case is to seal the >bottom of the tube so the fan(s) dosent(dont) use suction.
bottom of the tube so the fans don't *loose* suction.


And I should have added:

You need to suck a heck of a lot of air out of the bottom of a tube to have same affect against blowing at the back of the mirror.

However, sucking cools the mirror without distorting its figure. (Back-blowing fans can cause a local cool spot). Also, enough suction will suck some of the turbulent boundary layer off the front of the mirror making them almost as good as boundry-layer fans.



It hink filtering is especially important in this case.
I *think* filtering is especially important int his case (of boundary layer fans blowing across the mirror face).

I need to hire a proof reader
Re: Collimation & cooling

Attilla
 

I collimate my scope every time I set it up. So i've had lots of practice.

But I can use a sight-tube. My eyes cant focus on the mirror and the cross hairs at the same time. I've used a chesire, but i find them to be a pain. I have an auto collimator, but I don't use it. It's extremely sensitive to focuser tilt, which for a visual scope is not a critical adjustment.

I can however show you how to collimate with a barlowed laser (mine). It's the quickest method I know. I've compared it to cheshire collimation and find the barlowed laser to be just as accurate.

Come to the next Carp star party. And I'll show you how I collimate my scope and you can try the method with yours.



As for fan cooling:

if you're blowing against the back of the mirror a 120mm computer fan will suffice. But you should turn it off when doing planetary observations. I would also recommend filtering the fan intake. (You will be amazed how quickly the filter gets filthy.)

If you're sucking air out of the tube, I suggest a big a fan (or as many fans) as you can get. The key in this case is to seal the bottom of the tube so the fan(s) dosent(dont) use suction.

If you have a choice sucking is probably better than blowing. But it it is harder.

The very best fan arangement is fans that blow straigh across the front of the mirror. This is the mist effective arrangement as it produced instant results (the key is to thermaly-homogenize the air infront of hte mirror. do that, and you dont actually need to cool the mirror). However it's the hardest to mechanically implement. It hink filtering is especially important in this case.

I use a filtered-back blowing fan on my 25" because I havent figured out how to arrange surface scrubbing fans on my 25" whithout hacking the nice wood to bits.

-ad

--- In OAFs@..., "balticbirch" <tonykourlas@...> wrote:

Hi folks,

I recently picked up a Starmaster 20" f3.7 and was hoping to get some advice re collimation and cooling:

Collimation: I have a 1.25" sighttube/chesire, a 1.25" non-barlowed laser and a 2" auto-collimator and use them in that order. I've read many how-to docs on the internet but have little practical experience using them. If there is an experienced hand that wouldn't mind spending 10 minutes or so with me at the next starparty to validate my technique, I'd greatly appreciate it. Collimation seems quite critical at this f ratio.

Cooling: Any idea what size fan I need attach to my tailgate to cool a mirror of this size?

Thanks,
Tony.
Re: Collimation & cooling

Bob Olson
 

Hi Tony,

A 20 inch Starmaster!! I am not too jealous. I suppose you have a complete set of Ethos eyepieces to go with it!

There are many members of this list who can help you with collimation but Attilla gave me my lessons and explained all the steps clearly and without too much sarcasm about my lack of knowledge. See if you can con him into a collimation demonstration.

Have a great day.
Bob
Monichrome version of Jupiter with 4 moons

 

Here's my best yet Jupiter - despite the lack of colour.


This was taken at 5:43am on 2011-09-11. I just happened to be up and noticed that Jupiter was still high in the sky. And knowing the seeing was supposed to be excellent, i decided to try imaging Jupiter.
Collimation & cooling

balticbirch
 

Hi folks,

I recently picked up a Starmaster 20" f3.7 and was hoping to get some advice re collimation and cooling:

Collimation: I have a 1.25" sighttube/chesire, a 1.25" non-barlowed laser and a 2" auto-collimator and use them in that order. I've read many how-to docs on the internet but have little practical experience using them. If there is an experienced hand that wouldn't mind spending 10 minutes or so with me at the next starparty to validate my technique, I'd greatly appreciate it. Collimation seems quite critical at this f ratio.

Cooling: Any idea what size fan I need attach to my tailgate to cool a mirror of this size?

Thanks,
Tony.
Re: Jupiter Sept 11 2011 - good seeing

 

Rolf,
Sweet image. Lots and lots of detail. Nicely processed!

Last weekend while canoe camping at Charleston lake...I got up at 3 or 4am (2 many beer...2 actually :) ) and marveled at how high Jupiter was in the sky. I can't wait to get a look through the eyepiece (yes I still have a few of those). Does anyone remember (or lookup) when the last time it was so high in the sky for us?

cheers,
Albert.

--- In OAFs@..., "Rr" <cometwatch@...> wrote:

Seeing wasn't quite as good as advertised, but not too bad. Here is Jupiter from this morning. I took many captures, this being the last one. I don't know if it will be the best.



-Rolf
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