Konrad Guhl (IOTA/ES) A portable 20 telescope for IOTA/ES
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1 Guhl ESOP 2016 "a portable 20" telescope for IOTA/ES Konrad Guhl (IOTA/ES) A portable 20 telescope for IOTA/ES Abstract: The observational work of IOTA is spread out observation sites around the world. Due to focusing on occultation astronomy of TNO s and moons of the outer planets, the sizes of necessary telescopes have increased over the years. The standard traveling observatory for many years the C8 telescope (8 inch diameter) doesn t fit the requirements of these observations any more. The signal to noise ratio of these rather small instruments cannot keep up with faint objects (up to 20th magnitude), even if highly sensitive CCD (or EMCCD) cameras are used for detection. An instrument with a diameter of 20 would solve this problem: on a dark observation site, with an exposure time of 1 second, an instrument of this size is able to detect occultation of stars fainter than 18th magnitude. Therefore, IOTA/ES decided to buy a used 20 Dobson telescope in order to adapt it to the requirements of occultation work. An instrument of this size balances research capability and transportability well. The presentation will show the different stages of the project and the instrument in the final design. The first presentation about the instrument was given at ESOP XXXIII in Prague (2014). Within the last two years, the telescope was finished and improved. A first expedition was undertaken to the Alps for an occultation of a star by Pluto on July 19, The instrument will be based in Hannover (Germany, headquarter of IOTA/ES) and will be available for IOTA/ES members on request.
2 Guhl ESOP 2016 "a portable 20" telescope for IOTA/ES how it starts: The telescope presented to the IOTO/ES member on the anual meeting 2013 April.
3 Guhl ESOP 2016 "a portable 20" telescope for IOTA/ES Plan for the first observation: 2013 May 28 Uranus occults a star in southern Italy
4 Guhl ESOP 2014 "a portable 20" telescope for IOTA/ES Transport in a car Hannover Marwitz and tests in Marwitz and Comthurey
5 Guhl ESOP 2016 "a portable 20" telescope for IOTA/ES Tests of moving weight and Balance is not o.k. Urgent call to Michael Busse
6 Guhl ESOP 2016 "a portable 20" telescope for IOTA/ES First aid: A new tubus:
7 Guhl 2016 "a portable 20" telescope for IOTA/ES We learned: - Ballance is not all -Visual view is not a must - optimism is all On May 18 ready for May 28
8 Guhl 2016 "a portable 20" telescope for IOTA/ES We learned: - Ballance is not all -Visual view is not a must - optimism is all On May 18 ready for May 28 Travelling to Lecce but break of due to heavy rain
9 Guhl 2014 "a portable 20" telescope for IOTA/ES After so much bad experience General re-design by Micheal Busse. Some reason for delay A new goal PLUTO Status March 2016 (again problem with ballance)
10 New mirror carrier was used as center of weight Guhl 2014 "a portable 20" telescope for IOTA/ES
11 Guhl 2014 "a portable 20" telescope for IOTA/ES Test the balance! Head too heavy 2.5 kg! Shift mirror (29kg) for 250mm to have the fork arms on the ballance point
12 Shift the mirror 250mm Finding telescope out of center Counterbalance Guhl 2014 "a portable 20" telescope for IOTA/ES
13 June 2 Guhl 2014 "a portable 20" telescope for IOTA/ES
14 First light June 6 Moving balance weight on tube n.o.k. Guhl 2014 "a portable 20" telescope for IOTA/ES
15 The second father: Michael Dohrmann Guhl 2014 "a portable 20" telescope for IOTA/ES
16 second test night June 23 Guhl 2014 "a portable 20" telescope for IOTA/ES
17 Start July km south Guhl 2014 "a portable 20" telescope for IOTA/ES
18 Start July km south Guhl 2014 "a portable 20" telescope for IOTA/ES
19 After the first real observation under expedition conditions - cowling against light - stabilizing the forc arms - don t make alignment over the whole sky - anti-reflection - surface - create some boxes for air transportation - we will held a training afternoon in Berlin in autumn 2017 Guhl 2014 "a portable 20" telescope for IOTA/ES
20 Some telescopes do have a name. We learned the telecope has two father, Michael Busse and Michael Dohrmann. So lets call is M 2! Thanks! Guhl 2014 "a portable 20" telescope for IOTA/ES
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