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| Joint Astronomy Centre |
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THE UNITED KINGDOM INFRARED TELESCOPE
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| Semester | 01A | 01B | 02A | 02B |
| Total Number of Nights | 184.4 | 183.5 | 157.7 | 181.0 |
| Eng. and Commissioning Time | 28.3 | 30.8 | 13.2 | 32.0 |
| Science Nights | 156.1 | 152.7 | 144.5 | 149.1 |
| Science Nights Observed | 79.5% | 71.6% | 66.5% | 75.3% |
| Science Nights Lost to Faults | 2.6% | 1.5% | 5.0% | 6.3% |
| Science Nights Lost to Weather | 20.5% | 26.9% | 30.0% | 19.7% |
The fault rate was unusually high in 2002. In semester 02A an entire night was lost to a fault with the UFTI controller, complicated by communication problems. This semester also suffered losses associated with MICHELLE (which was still in shared-risk mode) and IRPOL. In semester 02B two complete nights were lost to two separate telescope faults -- a drive connector and a mirror support valve failed. There were also faults associated with MICHELLE, UFTI and UIST (in shared-risk mode), in UFTI's case again compounded by communication problems.