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Page 1: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Millennium TelescopeProject

Page 2: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Aperture Fever…!

Page 3: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Objectives

• Build large aperture portable telescope

• Maximise light gathering ability

• Lightweight open tube design

• Transportable to deep sky locations

Page 4: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Obsession 20” F/5Completed scope

Page 5: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Babcock 24 inch

Page 6: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Design Goals

• Ease of construction

• Ease of assembly/disassembly

• Ease of storage and transportation

• Ease of collimation (repeatable)

Page 7: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

MMT Activities...

Page 8: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Mirrors

Primary Mirror (Pyrex):– Diameter, 482 mm (19”)

– Edge thickness, 38 mm (1.5”)

– Focal length, 2165 mm (F/4.5)

– Calculated weight 15.6 kg (34 lb)

Secondary Mirror (elliptical plate glass):– Major axis, 150 mm (5.9”)

– Minor axis, 106 mm (4.2”)

– Thickness, 14.5 mm (0.6”)

Page 9: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Component Weights

Primary Mirror 15.39 kg (33.9lb)

Mirror cell base 5.48 kg (12.1lb)

Wiffletree 1.79 kg (3.9lb)

Rocker bearing (x2) 3.62kg (8.0lb)

Al bearing runner (x2) 0.80 kg (1.8lb) (optional)

Strut blocks (x8) 0.78kg (1.7lb)

Cross bars (x2) 1.38kg (3.0lb)

Base total = 28.43 kg (62.7lb)

(excluding Al runners)

8 x Struts (total) 4.11kg (9.1lb)

Cage ring 1.10 kg (2.4lb)

Secondary mirror 0.4 kg (0.9lb)

Focuser (est) 0.24kg (0.5lb)

Spider (est) 1.30kg (2.9lb)

Viewfinder (est) 0.45kg (1.0lb)

Telescope total 36.5kg (80.5lb)

Page 10: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Mirror Cell

Page 11: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube
Page 12: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube
Page 13: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Obsession 20” F/5Mirror cell assembly

Page 14: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube
Page 15: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube
Page 16: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube
Page 17: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube
Page 18: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube
Page 19: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Babcock 24” F/4

Page 20: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

22” F4.05 DesignSecondary cage and spider assembly with

baffling

Page 21: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Obsession 20” F/5Truss tube clamps

Page 22: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Obsession 20” F/5Inserting mirror

Page 23: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

16” F/3.75 String Telescope

Base

Page 24: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

22” F4.05 DesignCutaway of bottom frame and drives

Page 25: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

16” F/3.75 String Telescope

In car!

Page 26: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Extras - Other Designs

• Internet a great source of information providing inspiration!

• Ultra-light designs evolving from more traditional Obsession

• MMT uses best features of all these designs

Page 27: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Sayre 22 inchCAD drawings

Page 28: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Dan Gray 16” F/3.75 Completed scope

Page 29: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

16” F/3.75 String Telescope

Disassembled scope (fits in a hatchback!)

Page 30: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Gary Wolanski, USA16” F/5 Dobsonian, 40 Pound, all-metal construction

Page 31: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Jaques Civetta, France465mm Dobsonian, fibreglass construction

Page 32: Millennium Telescope Project. Aperture Fever…! Objectives Build large aperture portable telescope Maximise light gathering ability Lightweight open tube

Doug Tanaka, USA12.5” F/6 String-Truss Dobsonian


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