The STELLA control system 2 nd workshop on

The STELLA control system 2 nd workshop on robotic telescopes, Torremolinos, Spain, June 7 th, 2011 T. Granzer, M. Weber, K. G. Strassmeier, et al.

What is STELLA? ØTwo robotic 1. 2 m, f/8 and f/8. 4 Alt/Az telescopes to study STELLar Activity. ØObserving in fully unattended mode, including safe modes during bad-weather periods. ØIt is intended for long-term observations spanning years, not for short programs. ØA single instrument per telescope – not a multi-purpose telescope.

Where is it? ØTenerife / Teide Ø 2400 m Altitude ØAIP/IAC STELLA

Which instruments? Two telescopes, two instruments. SES ØEchelle Spectrograph, fiberfed, R 55000 Ø 380 -860 nm, fixed format Wi. FSIP ØWide-field imager, 22’ Fo. V, Strømgren, Johnson, and Sloan filters plus H Ø 4 kx 4 k STA chip, 0. 32 arcsec/pixel

Currentp, status? GRB 110402, co-added 60 x 20 sec HAT 12 r’=12. 5 m, 23. 4. 2011 texp=40 min STELLA 1&2: üSimultaneous high-res spectra (R~55000) and widefield imager (22’x 22’, full Johnson, Strömgren and Sloan filter set + H ). üExtreme long-term and fast-reaction modes. üExclusive access. üFully reduced data (plus data products) …lots of experience & algorithms (java) HD 1, V=7 m 43, combined spectrum

How? Generic publisher/subscriber schema. Events are generated in the publisher and passed to registered subscribers. Advantages: ØSubscribers may be introduced as needed. They can be incorporated into the running system. ØBugs in this new software will not back-react on the core system as they run on a different virtual machine.

Network-layout

Carry out the command submission SCS, the core Yields actual command sequence by filling target data into template Picks target with currently highest priority Commands are sent to communication handlers Target defines observing template All observable targets, user supplied

Work-flow ØSplit into parallel and sequential tasks. ØAdd a watchdog for execution hangs. ØAllow errors to alter the sequence. We use an XML-based sequence definition

Reference to target type 2 8 Requirement " src="https://present5.com/presentation/38367e97346f7fab5e3d42e2dc2e8537/image-10.jpg" alt="Parallel/sequential 1 Reference to target type 2 8 Requirement " /> Parallel/sequential 1 Reference to target type 2 8 Requirement 9 to commence Task_open ∧ telescope_finished MOVE_TELESCOPE task 10 Pure 11 DONE_MOVE_TELESCOPE: main sequential 12 Parallel execution What to do 13 execution 14 on_group ∧ adapter_finished allowed 15 FIND_ADAPTER 16 DONE_FIND_ADAPTER: main 17 From target This 18 task is definition finished 19 20 DONE_MOVE_TELESCOPE: main ∧ DONE_FIND_ADAPTER: main+1000 21 22 ACQUIRE_ADAPTER 23 DONE_ACQUIRE_ADAPTER: main 24 25

Defining targets ØXML-based target description. ØAstrometric target data and field-of-view are filled in from the (local) UCAC-2 catalogue or using SOAP on Vizie. R. ØInstrumentation requirements must be specified by user. ØUser might add supplementary observing constraints.

2 3 Exposure. Time 4" src="https://present5.com/presentation/38367e97346f7fab5e3d42e2dc2e8537/image-12.jpg" alt="Run-time resolved 1 2 3 Exposure. Time 4" /> Run-time resolved 1 2 3 Exposure. Time 4 3600. 0 Unique 5 reference for sequencer 6 22