|
Year ending June 30 ->
|
2000 | 2001 | 2002 | 2003 | 2004 | 2005 |
|---|---|---|---|---|---|---|
|
Nights scheduled
|
294
|
315
|
332
|
332
|
315
|
349
|
|
Nights used
|
151
|
168
|
198
|
210
|
186
|
199
|
|
Night number efficiency
|
51%
|
53%
|
60%
|
63%
|
59%
|
57%
|
|
Hours used
|
888
|
986
|
1121
|
1317
|
1090
|
1334
|
|
Hours eff. (max 3459h)
|
26%
|
28%
|
32%
|
38%
|
32%
|
39%
|
|
Mean night duration (h)
|
5.9
|
5.9
|
5.7
|
6.3
|
5.9
|
6.7
|
The main loss of time: The gearbox failure in February 2000 (37 nights); fire in the generator room in October 2001 (8 nights), painting of the dome in July 1999 (4 nights); failure of the original Thomson CCD detector in September 2003 and instalation difficulties with its replacements (#2 & #3) and with the JY#1 detector system in the period October 2003 to October 2004 (about 50 nights); aluminizing of the main mirror each year in September/October (5 nights each year); the rest are vacations, holidays and other staff related reasons.
Update: Slavek Rucinski (with contribution of Jim Thomson), Nov.1,2005