Enjoy the sky,
Nytecam 51N 0.1W Meade 30cm LX200 astrograph+C8+Ha+CaK PSTs+spectrographs SX M9+Lodestar-C+M CCDs/Canon 1100D DSLR My Meade astrograph-colour deepsky My supernova discovery My dome build/spectroscopes/DSO images/Lodestar colour images & videos
Quote:Do ensure, before the pier is encased, that there is no solid contact with adjoining house structure - any such close points better wrapped in insulation quilt to ensure no solid falling debris get trapped there to transfer house vibration to the pier.
What scope have you in mind - for visual or imaging ? Good luck
Quote:I'm still going to have to try to convince the wife that we need to add a dome to the house when we build it. She keeps saying, "But you have your observatory now!", but it's just not the same!
Quote: The structural engineer for the project designed the pier - and it was a first for her - just as it was for me. The pier is very slender (16" diameter) as you say - but I found that its extreme height gives it so much volume and mass that it takes a lot to make it move. I would like a bigger diameter but there is now a darn house in the way
Dark Arts Observatory - Brockport, NY - Skyshed POD XL5 with iOptron iEQ45 Mount
Scopes: C8, C5, SV110 ED, EON-72 ED, ST 80, ATRC6, Megrez 90
Quote:I used the PME2 diemsion of 9-1/2 inches for the distance from the axes intersection to the versaplate. My quicky calcs indicate that in the extreme horizontal orientation I am left with a distance of about 12" to represent an OTA aperture that is not obstructed by the dome wall. This is a first dome for me - can anyone tell me if there is more to the max OTA calculation?
I lost count of my scopes. Now I just want mobility. I came, I saw, I bought some interesting accessories, and put names to faces: NEAF 2012, ASAE 2012, SWAP 2013, ASAE 2013.
Quote:Yes, any sensible dome control software will allow for the offset of the OTA from the Ra and Dec axes, also any offset of the Ra and Dec axis interscetion from the centre of the dome. I'm updating the ASCOM software to do this at the moment.Chris
Quote:Here are my quicky calcs for finishing off the pier. I hope this pic is legible. Its the first time I've done this so I appreciate any corrections/additions or practical advice. Starting from the floor and working up:
20" concrete pier
3/4" plywood transition
1" pier top plate
11" steel pier extension
16-1/2" to the insection of the RA/DEC axes for the mount (PME2). 43-1/4" to bottom of dome opening.
That should do it for height. The steel pier extension gives me a fudge factor and flexibility to make future changes. It also reduces the horizontal dimension from 16" to 11" to minimize chances of counterweight collisions and allow me to set the mount with the desired offset for zenith viewing.
I used the PME2 diemsion of 9-1/2 inches for the distance from the axes intersection to the versaplate. My quicky calcs indicate that in the extreme horizontal orientation I am left with a distance of about 12" to represent an OTA aperture that is not obstructed by the dome wall. This is a first dome for me - can anyone tell me if there is more to the max OTA calculation? Thank for any input.
Remember, if the women don't find you handsome, they should at least find you handy.
I don't know how old I was when I was one.
Quote:Don't quite understand relationship between sketch and dome height eg where scopes axes intersect relative to lowest portion of dome shutter. My dome sketch below for my 12"SCT LX200 shows axes intersect ON the lowest section of shutter and central on the vertical axis through the dome so the scope is 50% obstructed when aimed horizontally. I've a fork mount with scope a constant distance from the dome itself. A GEM will offset the scope and clearances must be allowed for. I find it useful for daytime testing to aim scope horizontally on distant objects for cam focus, finder alignment, effect of Barlow and focal reducers on image scale etc and not waste night set-up time. Also even with partial obstruction of scope aperture very lowly objects like Mercury, a comet or nova etc can be observed, depending on your horizon. Alternatively if the scope[s] are set way below the shutter and horizon unobservable perhaps a well located window in the obsy walls could serve for daytime set-up. Hope these comments help.
Quote:That's a big beautiful house! When it's finished, are you going to move permanently to Idaho or will you still winter in Arizona?
Quote:....And of course at the same I'm making these decisions many are imaging a comet near the horizon....
Stan Meade ETX-60AT-BB (60mm Achromatic Refractor)01-30-08
NW Mass, inches from Vermont
(well....it used to say that.....)
Quote:Looks like it's coming along nicely! Just wondering ... you have some unique design elements in the house structure, framing, etc. Did you have any trouble getting any of it by the building inspector?
Quote:My compliments, Sir! I've been pounding nails for a lot of years, and yours is about the finest owner-builder work I've ever seen. Well done!Russ