### OBSDATE ###
20110910

### LOGDATE ###
110911

### OBSERVERS ###
BAW

### WEATHER ###
Clear. High humidity.

### LOCATION ###
SUSI

### PROGRAM ###
Testing ark siderostat controllers.

### SIDEROSTATS ###
n1     s3 s4

### TARGETS ###
hr 8151 (no data)
hr 8425
hr 8728
hr 8425
hr 8728
hr 8425

### QUALITY ###
 Average 

### PROBLEMS ###
Very difficult finding star with S4's very narrow field of view. Also difficult to find a bright star that was not likely to be resolved. Nonetheless, I did get hr 8151 onto Pavo. I was unable to find fringes. I did not know it at the time, but the OPLC was probably out of position (see below). After several minutes, the star was lost on S4 and I was not able to reacquire it before I got frustrated.

Stars were easily acquired with S3. For a long time, I was not able to find fringes. After exhausting a large search space, I decided to re-"index" the cart. I discovered that it was many metres out. After fixing that, fringes were easily found. The targets are my two calibrators from the other night when testing n1 by itself. One should be partially resolved on the N1-S3 baseline, the other should not be resolved.

Interestingly, N1 was much better behaved in terms of "twitching." At no point did N1 "twitch" itself completely off Pavo although S3 did several times (and S4 did a couple of times as well). Is it possible that this is a matter of mechanical sticking (cold grease) on siderostats that have not been used for months? That is the only way I can explain N1 getting better on its own. Of course, it could be down to randomness.

S2 has not been tested on the sky due to a shortage of cables and the fact that I want to go to bed rather than swap cables around in the dark. Nonetheless, I declare the new siderostat controllers functional.