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Goto Optical Coelostat

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#1 Steve_M_M

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Posted 18 September 2012 - 09:09 PM

Arriving today, 2 GIANT boxes-One measuring 62x18x18 and weighing in at 41 lbs. The other measuring 34x18x18 and also weighing 41lbs. Inside each of these boxes was 1/3 Goto Coelostat and 2/3 packing material. By the time it was over, there was enough peanuts to fill the 62x18x18 box and approximately 125 ft of bubble wrap. There was 22 individual boxes, each packed just a carefully as everything around it.

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#2 Steve_M_M

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Posted 18 September 2012 - 09:10 PM

It took forever to unpack the Coelostat, but when I was done it was clear there was absolutely no damage. Next up was removal of surface rust, cleaning the mirrors, lubrication, and finally set up. Here it is fully set up. It's huge! That's a 6 ft table it is on.

Almost 40 years old and it is basically perfect. Not even a scratch on the wood :)

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#3 Steve_M_M

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Posted 18 September 2012 - 09:11 PM

Without telescope. Showing just Coelostat. 5" primary mirror, 4" secondary.

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#4 Steve_M_M

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Posted 18 September 2012 - 09:16 PM

I bought this late night. I had no idea if the motors were working or even if the mirrors existed. The next day, the seller and I spoke often. He had not tested the drives and had no idea there were mirrors under the covers. We determined that the mirrors were in great condition and the motors worked perfectly. Today I confirmed that. Yeah!!!

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#5 Steve_M_M

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Posted 18 September 2012 - 09:18 PM

Typical Goto. Ridiculously over-built in every area. Nifty little covers on everything.

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#6 Steve_M_M

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Posted 18 September 2012 - 09:22 PM

Came with an great selection of optical goodies. The diagonal is a herschel wedge. The eyepieces appear unused. 2 solar filters, and a projection system. There was no mold damage as stated in the ad.

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#7 Steve_M_M

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Posted 18 September 2012 - 09:27 PM

Two issues....

One, the only missing piece is the focus tube to ocular holder adapter. I have tons of Goto parts, but not this one. I even have a very nice homemade adapter machined from aluminum...but the output is 1.25".

Two, the seller said it came with instructions. The instructions are on how to use the 80mm f15 scope for astronomical use on an EQ mount. No instructions for the Coelostat. I have only intuition to go on and I sure could use some help intuitizing :question: Here is an article to get started.. Coelostat

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#8 mustgobigger

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Posted 18 September 2012 - 10:14 PM

Very nice Steve.
Keep us posted on how
it works.
Never seen one in person.
:bow:

#9 Steve_M_M

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Posted 18 September 2012 - 10:34 PM

Figured out the mirror alignment. Also, forgot to mention the great condition of the case and support.

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#10 Dan /schechter

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Posted 18 September 2012 - 10:38 PM

Fabulous acquisition Steve!! Can`t wait to look thru it.

Dan

#11 Ducky62

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Posted 19 September 2012 - 12:05 AM

I can't figure how to download or read that coelostat article.

Have you cleaned/de-fungused the objective yet?

#12 Steve_M_M

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Posted 19 September 2012 - 12:11 AM

I have not removed the objective yet. Maybe this weekend.

I fixed the link. If you click on "print this page", it brings up a pdf that is easier to read.

#13 Mr Magoo

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Posted 19 September 2012 - 04:40 AM

Very interesting Steve. Is this something that an individual would have owned, a professional astronomer, or learning institution?

#14 Rich (RLTYS)

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Posted 19 September 2012 - 05:11 AM

That is so cool. :cool: :cool: :cool: :cool: :cool:

Rich (RLYS)

#15 sgorton99

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Posted 19 September 2012 - 06:13 AM

Most excellent! Looking forward to more pics.

#16 clintwhitman

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Posted 19 September 2012 - 07:58 AM

Ubber cool Steve thats one for the one of a kind list!

#17 tim53

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Posted 19 September 2012 - 08:32 AM

Awesome acquisition, Steve! I'll bet viewing with it will be amazing, since you won't have to worry about the image moving while you focus!

-Tim.

#18 DAVIDG

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Posted 19 September 2012 - 09:36 AM

Steve,
Great find. You now need to find the GOTO prominence attachment to go with it.
A couple of tips since I'm restoring a Hale spectrohelioscope that will soon be installed at Stellafane and (See ATM-1 for the design) it uses the same Coelostat configuration. First the flats need to be very good optically and at least 1/10 wave or better or they will introduce astigmatism into the image.
The rail system for the second mirror which reflects the light into the telescope is used to compensate for the changing DEC of the Sun through the year, so every few days you'll need to adjust it either closer to or farther away from the objective depending on the time of year. Also there needs to be a way to relocate the tracking mirror from the East side of the bracket to the West side or you won't be able to track the Sun after it passes thru the meridian at Noon In the morning the tracking mirror is on the West side and in the afternoon it is moved to the East side. The tracking motor is turning at 1 rev in 48 hours. The system is aligned North/South with the eyepiece located at the northern end and polar axis of the tracking mirror is polar aligned.
You said the motors work. Are they DC or AC ? If AC are they for 60HZ and 120 Volts operation ?

- Dave

#19 Steve_M_M

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Posted 19 September 2012 - 12:22 PM

David,

Very helpful. Thank you! The Coelostat does the ability to move the mirror to the other side to compensate meridian crossing. I suspect the mirrors will easily be 1/10 wave based on what I have seen from Goto in the past. The motors are AC and run on 125v (yes, that is what they say) 60 hz.

I wrote to my contact at Goto last night at 11pm and got an immediate response. They are so awesome! The contact had never seen one of these before. They are looking for a manual. I am also going to see if they have the solar prominence viewer, projection attachment, and my little missing piece.

Steve

#20 DAVIDG

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Posted 19 September 2012 - 01:31 PM

Steve,
The beauty of this system would be to use it with a modern day H-alpha filter, either Lunt or a Daystar.
If you can find a GOTO prominence viewer, the issue will be the narrow band interference filter since the odds are very good that it will be bad. The technology used to make them back 15 years caused them to have a useful life of no more then 10 years. The good news is that you can get replacements. If you want to build your own, here is a link to instructions for an unit I designed and built. http://www.considine...oski/promscope/
I also understand the GOTO made a solar spectrum projector which projected the solar spectrum onto a screen. That would also be a neat accessory to have.

- Dave

#21 Steve_M_M

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Posted 19 September 2012 - 04:09 PM

It works! Unfortunately, I can't use any of the Goto fancy accessories until I have the adapter I need. But, it is tracking out there right now. It's very nice to have the motor on the 2nd mirror for minor corrections.

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#22 Steve_M_M

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Posted 19 September 2012 - 04:13 PM

Since I had to swith the primary mirror to west side, it gave a nice photo op for the Goto plate.

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#23 DAVIDG

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Posted 19 September 2012 - 04:59 PM

Steve,
Since the flats are coated, there is nothing stoping you from using it at night to observe the Moon and the planets since they are on the ecliptic as well as the Sun. Along with viewing the Moon with an eyepiece it will also project onto the screen pretty well especially when it is near full. You can also look at a bright star at high mag. and see how round it is, since that is great test of the quality of the flats.

- Dave

#24 rfic1

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Posted 19 September 2012 - 05:24 PM

Dave,
I'm not sure there would be a benefit for the intended solar use but is the lens cell marked semi-apo? The OTA and focuser look identical to my 80mm fl 1000mm Goto semi-apo

Bob

#25 Steve_M_M

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Posted 20 September 2012 - 12:47 AM

David,

I do intend to try it out on the moon and planets. Thanks for the tip about checking the flats. I will try it on a star, and then on the moon this weekend.

Rob, the scope is an achromat. Not a semi apo .


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