1. First Light at Prompt7 (Chart32) Chilean Advanced Remote Telescope 32“ operating at Cerro Tololo/Chile (CTIO)
March 04, Johannes Schedler

2. Content Team Selection of Location Project history Enclosure/Dome
Telescope Setup
Control philosophy and software
First results
Links

3. Our Chart32 Team Philipp Keller UNC (host) http://unc.edu/
Dan Reichart
Joshua Haislip
Aaron LaCluyze
Justin Moore
Konstantin Buchhold Johannes Schedler
Bernd Flach-Wilken
Volker Wendel

4. Selection of Location at CTIO
Geographical location > 30° south
Elevation > high
Sky conditions ++
Darkness ++
Humidity > low
Seeing ++
Clear nights ++
Infrastructure ++
Costs > shared

5. Decision for CTIO/UNC Chile
Reliable infrastructure
Optimal sky conditions at 2200 m
Continuous support available
Dome construction done by UNC
Operating costs taken by UNC
Shared use between UNC and us
Dark time for our team Bright time for UNC
Override by UNC any time by UNC in case of special events (GRB)
Place of Chart32
4 m Blanco Telescope

6. Weather conditions clear nights at CTIO

7. Sky conditions at CTIO typical mag 21.5-22

8. Project History
First contacts in Chile with support of Daniel Verschatse: Cerro Armazones, then CTIO (Cerro Tololo Inter-American Observatory)
„Go“ from UNC (University of North Carolina) at CTIO
Contract signed with UNC in March, fund raising dome construction plans prepared
Final drawings ready, start of bid process
Erection of dome building (March-April)

9. Project History March: shipment of telescope equipment to Chile
2012 November: commissioning (Philipp and Konstantin) >first light!
2013 February: CCD camera back from repair, optimization full remote operation and control possible

10. Enclosure Dome Diameter 5 m
Avoid ground seeing: Telescope height 4.5 m from floor
Avoid dome seeing: Forced ventilation up to 5 m³/sec

11. Optics designed by Philipp Keller
Classical cassegrain
Mirror: 0.81m Sitall
Focal length: 5.6 m
3-lens Wynne corrector
Corrected field: 150 mm (diffraction limited)

12. OTA Open truss design Robotic dust cover (mirror + baffle)
Focusing by secondary mirror
Lasalle mirror support
Remote collimation

13. Mount Equatorial fork mount Torque motors 200 Nm both axes
Encoder resolution 0.01 arc sec
Pointing accuracy <5 arc sec
Tracking accuracy <0.1 arc sec (5min)
All cables through mount

14. CCD Imager: FLI-16803 Proline 4096x4096 at 9 um
8-pos FLI 50x50mm Filter wheel
Resolution: 0.33“/pixel
Field: 22.3‘ x 22.3‘
Guider: Lodestar at 49mm off axis

15. Data & Power Connections in CHART32
Dome Rails
and Shutter
Internet
ScopeDome
Controller
CCD Powerstrip
Telescope
Controller
CTIO Firewall
Wireless
Router
Dome Fans
Datacenter
Le Serena
PC2
Backup
Scope Covers
PC1
Control
Microwave
Antenna
110V 60Hz
Ethernet
Dome Light
WiFi Antenna
Microwave
Antenna
IP Webcam
IP Boot Manager
Datacenter
CTIO
FX/TX Converter
Ethernet
switch
IP Power switch
Fibre Optic Link

16. Software Sequence Autoslew Pinpoint Maxim DL The Sky CCD Auxiliaries:
Scopedome
Watchdog
SMS alert
The Sky
optional

17. Control via Autoslew/Pinpoint
Developed by Philipp Keller
Includes safety, dome and ventilation control
All sky pointing model
Scheduler for automated imaging
MLPT tracking allows unguided tracking up to 20 min
Deviation before MLPT

18. Control via Autoslew/Pinpoint
All sky pointing model included
Scheduler for automated imaging

19. First light image (Nov 2012)
NGC253
10 min L
3 min RGB
100% crop

20. NGC3372 NB 460 min

21. Future High resolution planetary imaging with moveable pick-up mirror
Cooperation with professional astronomers
Very long deep exposures

22. Links Chart32 Homepage http://chart32.de
Philipp Keller Homepage
ASA Astrosysteme Austria (Partnership with Philipp Keller)
Cerro Tololo Inter-American Observatory (CTIO)
Johannes Schedler Homepage
Bernd Flach-Wilken/Volker Wendel Homepage
Konstantin Buchhold Homepage