Useful WFI facts
1. WFI is oriented with E up and N right.
2. Pixel size=0.2295"
3. WFI has a plate scale of ~15"/mm.If you have to manually set a star into each chip, the following set of APOFF values can be used:
Chip: X Y
------------------
1 +15.00 +45.00
2 +15.00 +15.00
3 +15.00 -15.00
4 +15.00 -45.00
5 -15.00 -45.00
6 -15.00 -15.00
7 -15.00 +15.00
8 -15.00 +45.00
APOFFs +X moves telescope to W +Y moves telescope to N but see Steve Lee's Possibly Useful Information pages from where I stole this table for a different opinion on these appoffs
Before Observing
1. Run CICADA from aatssx. Run PFU and TEL CONTROL from xterm next to it.
2. Cleanup CICADA
3. Start up CICADA
4. Initialise Controllers.
5. Set temperature (Nominally 183K, After crash 177K).
6. Initialise and read filters from PFU.
7. Update filter table in CICADA.
8. Do biases. Should be around 3000, 4000.
After Four o' Clock
1. Turn out the lights (in the dome!)
2. Do darks. Similar exposure times to science frames. If guiding you want the darks with the guide CCDs on as they glow!
3. Do dome flats - with bright lamp, and short exposures. Aim for around 30000 e/adu.
Whilst observing
1. Get twilight flats - bluer ones when it is brighter. Don't go shorter than 5s. Don't go longer than 120s. Aim for around 30,000 e/adu.
2. Focus the telescope in V. Get relative offsets from scripts. V=40.15 10/8/04.
3. Exposures around 450s, except in U, can be around 1800s.
4. Guiding with WFI