Millenium Telescope.

Initial Meeting.

Format

Part 1 - Planning

Part 2 - Sample Designs

Part 3 - Discussion/what happens next

Objectives

Resolve location and usage issues

Agree design

Present detailed design/cost to Committee

Go/No Go?

Aperture Fever…!

Part 1 - Planning...

Location/usage

Most difficult part!

Dedicated effort

Some options Dome? Balcony? Downstairs? Elsewhere in school grounds

Design Goals

Ease of construction

Ease of assembly/disassembly

Ease of storage and transportation

Ease of collimation (repeatable)

Mirrors

Primary Mirror (Pyrex):– Diameter, 482 mm

– Edge thickness, 38 mm

– Focal length, 2165 mm (F/4.5)

– Calculated weight 15 Kg

Secondary Mirror (elliptical plate glass):– Major axis, 150 mm

– Minor axis, 106 mm

– Thickness, 14.5 mm

Part 2 - Sample Designs

Kriege and BerryObsession 20” F/5

Obsession 20” F/5Completed scope

Obsession 20” F/5 Unpacking truss tubes

Obsession 20” F/5Opening mirror box

Obsession 20” F/5Inserting mirror

Obsession 20” F/5 Setting mirror down

Obsession 20” F/5Install upper tube clamps

Obsession 20” F/5Mirror cell assembly

Obsession 20” F/5Truss tube clamps

Obsession 20” F/5Securing mirror

Dan Gray 16” F/3.75 String Telescope

16” F/3.75 String TelescopeCompleted scope

16” F/3.75 String TelescopeBase

16” F/3.75 String TelescopeClose-up of bearings

16” F/3.75 String TelescopeRocker

16” F/3.75 String TelescopeSquare tube support

16” F/3.75 String TelescopeString length adjustment

16” F/3.75 String TelescopeCollimation adjustment point

16” F/3.75 String TelescopeSecondary cage and spider

16” F/3.75 String TelescopeCollimating

16” F/3.75 String TelescopeDisassembled scope

16” F/3.75 String TelescopeIn car!

Greg Babcock 18” F/4.55

18” F4.55Completed scope

18” F4.55Gallery

Greg Babcock 24” F/4 Ultra-light

24” F/4 Ultra-LightCompleted and disassembled scope

24” F/4 Ultra-LightAltitude bearing and stand

24” F/4 Ultra-Light4” Mirror cell clearance for drive

24” F/4 Ultra-LightTrusses

24” F/4 Ultra-LightCage

24” F/4 Ultra-LightCompleted scope

24” F/4 Ultra-LightCompleted scope

24” F/4 Ultra-LightIn car!

Bruce Sayre 22” F4.05 Design

22” F4.05 DesignCompleted scope

22” F4.05 DesignBase

22” F4.05 DesignCutaway of bottom frame and drives

22” F4.05 DesignClose-up of bottom frame

22” F4.05 DesignBottom portion of telescope

22” F4.05 DesignSide view of rocker

22” F4.05 DesignRocker

22” F4.05 DesignMirror cell multipoint flotation assembly

22” F4.05 DesignMirror cell with flotation assembly underneath

22” F4.05 DesignDrive motor assembly

22” F4.05 DesignStrut attachment

22” F4.05 DesignTruss tube mounting

22” F4.05 DesignView above completed scope

22” F4.05 DesignSecondary cage and spider assembly with baffling

22” F4.05 DesignSecondary cage side view

Digital AstrophotographyC2020z - Planets with 20” Newtonian

Part 3 - Discussion

Team for location/storage Obtain 45 gal drum Consolidate designs/plans

– Contact designers (email)– Monitor bigdob discussion group

Contact FAS/other AS for feedback Possible visit(s) to other AS Agree next meeting