Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Hubble Space Telescope wikipedia , lookup
Arecibo Observatory wikipedia , lookup
Allen Telescope Array wikipedia , lookup
Spitzer Space Telescope wikipedia , lookup
Lovell Telescope wikipedia , lookup
International Ultraviolet Explorer wikipedia , lookup
Optical telescope wikipedia , lookup
Very Large Telescope wikipedia , lookup
James Webb Space Telescope wikipedia , lookup
Millennium Telescope Meeting 2 Requirements and Design Goals Requirements... Portability The telescope unlikely to be used in dome or on balcony- so must be portable. This also implies it must be de-mountable and easily assembled. Mirror The mirror spec is fixed; the cell must be designed to support the 'thin' 19" mirror without significantly degrading optical performance. Height Primarily fixed by mirror focal length and diameter- otherwise the lower the better, minimises the climb up a ladder. Will be approx 7 feet. Footprint The disassembled telescope should fit into a hatchback- e.g. Golf or Focus. Must be easily stored at OASI e.g. in storage area at bottom of dome steps. Weight All de-mounted components should be capable of unaided lifting and manoeuvring by two (unexceptional) persons; imposes an upper limit of about 60 pounds per component. Open Structure Avoids fans and promotes rapid cooling of the primary. Less prone to wind vibration. Minimises weight. Struts/Truss-Tubes Short enough to fit into a hatchback; look into multi-section struts; struts cannot exceed a certain length (subject to design). Can we use 6 struts rather than 8; this simplifies telescope balance and reduces weight? Stiffness Minimise flexure with rigid structures. Rocker/Mirror Box Rocker may be more elegant, simpler to make and achieve weight targets - but design is more speculative. Mirror box is proven design but much heavier- and may not meet design requirements. Secondary Cage Keep as light as possible- consistent with mechanical rigidity. Design should consider (optically) best available eyepieces- probably 2". Secondary mirror pre-alignment should be designed-in. Design needs to be safe for transportation. Optical System Mechanical assembly must be repeatable such that telescope is approximately prealigned. Telescope must be capable of easy remote- site fine-alignment. Baffling Upper cage and primary mirror baffles need to be de-mountable and easily installed. Drive System Although initially envisioned to be manually tracking, it would be highly desirable to be capable of upgrading to automatic tracking, at a later date. Economy of Materials Minimise costs by keeping material weight down. Use plywood + steel where possible and standard components if available. Economy of Machining Design as many non-standard components as possible that can be produced "in-house". Consider use of plywood, for rocker or mirror box, etc; and Martin's metal working expertise for other components. FAS Website Trawl... John Cross, Bristol AS 14” F/4.5 Dobsonian Jim Brace, Wadhurst AS 18” F/5 Dobsonian Gary Poyner, Heart of Eng AS 18” F/4.4 Dobsonian Wadhurst AS, Norfolk Other Designs… Alternative materials Gary Wolanski, USA 16” F/5 Dobsonian, 40 Pound, all-metal construction Gary Wolanski, USA 16” F/5 Dobsonian, 40 Pound, all-metal construction Gary Wolanski, USA 16” F/5 Dobsonian, 40 Pound, all-metal construction Charlie Wicks, USA 20” F/4.5 Dobsonian - all-metal construction Jaques Civetta, France 465mm Dobsonian, fibreglass construction Doug Tanaka, USA 12.5” F/6 String-Truss Dobsonian Michael Koch, Germany 8” F/4 “Folding Ruler” Airline Travel Scope