Status and Predicted Performance of ESAs Flyeye Telescope

Status and Predicted Performance of ESA’s Flyeye Telescope Rüdiger Jehn 1, Detlef Koschny 1, Udo Kugel 1, Gunther Sessler 1, Lorenzo Cibin 2 1 European Space Agency; 2 OHB Italy 20/06/2018 ESA UNCLASSIFIED - For Official Use

Italy 35% Romania 13% Poland 13% Germany 13% Czech Republic 4% Spain 7% Norway 5% Luxembourg 9% Total ESA UNCLASSIFIED - For Official Use 8. 1 Million € Udo Kugel | ESOC | 30/06/2017 | Slide 2

ESA’s Fly-Eye Telescope Challenges Large field of view: 6. 7 x 6. 7 deg 2 instantaneous field of view - Conventional telescope design < 2. 5 x 2. 5 deg 2 (Schmidt) High sensitivity: detection of objects down to magnitude 21. 5 - 3 scans per night of sky area up to 100 x 100 deg 2 - CCD integration time around 40 s Object diameter detectable: 300 m at 1 AU (albedo 0. 05, 0 degree between sun-object-observer) CCD pixel size at 1 AU: 1000 x 1000 km 2 ESA UNCLASSIFIED - For Official Use Udo Kugel | ESOC | 30/06/2017 | Slide 3

ESA’s Fly-Eye Telescope Schmidt-type Telescope with Equatorial Mount Challenges Secondary Optics with 16 Optical Tubes/Camera Concrete Interface Central ring Design Primary Mirror Cradle Right Ascension Fork Declination Axis ESA UNCLASSIFIED - For Official Use Udo Kugel | ESOC | 30/06/2017 | Slide 4

ESA’s Fly-Eye Telescope Internal light path Challenges Aspherical lenses Beamsplitter Design ESA UNCLASSIFIED - For Official Use Udo Kugel | ESOC | 30/06/2017 | Slide 5

ESA’s Fly-Eye Telescope Features Challenges Design RA angular range +/-205° Primary mirror 1150 mm Dec angular range +/-75° Effect. focal length 2000 mm Max rate/acceleration 7°/s Field of view 6. 7 x 6. 7 deg 2 Pointing stability +/-0. 5” Optical throughput 80% Total mass 23200 kg Encircled energy 80% in 12µm Required dome size 14 -16 m Resolution per camera 16 Mpix Nominal exposure 40 s Pixel read-out 16 bit Magnitude 21. 5 Pixel size 15 x 15µm 2 Image size full FOV 4 GB/512 MB Pixel scale 1. 5”/pix Read-out noise 10 e @ 2 MHz 12°/s 2 Features ESA UNCLASSIFIED - For Official Use Udo Kugel | ESOC | 30/06/2017 | Slide 6

Optimized scan with 4 revisits ESA UNCLASSIFIED - For Official Use Udo Kugel | ESOC | 30/06/2017 | Slide 7

Seeing = 1 pixel ESA UNCLASSIFIED - For Official Use Udo Kugel | ESOC | 30/06/2017 | Slide 8

Seeing = 3 pixel ESA UNCLASSIFIED - For Official Use Udo Kugel | ESOC | 30/06/2017 | Slide 9

Challenges Design Features ESA UNCLASSIFIED - For Official Use Udo Kugel | ESOC | 30/06/2017 | Slide 10

ESA’s Fly-Eye Telescope location (#1) Challenges Design Features • Monte Mufara in Sicily • Altitude: 1845 m • Only a gravel road, not yet electricity & water. • Not yet an official answer to the preliminary building request Status ESA UNCLASSIFIED - For Official Use Udo Kugel | ESOC | 30/06/2017 | Slide 11

ESA’s Fly-Eye Telescope Challenges Design Features Status ESA UNCLASSIFIED - For Official Use Udo Kugel | ESOC | 30/06/2017 | Slide 12

ESA’s Fly-Eye Telescope Challenges Design Features • Manufacturing nearing completion • Integration & validation has started • Factory acceptance test in Q 1 2019 • Preparation of the site infrastructure • First light 2019 (seems a challenge given the delays in the camera and the site preparation) Status ESA UNCLASSIFIED - For Official Use Udo Kugel | ESOC | 30/06/2017 | Slide 13