Location: Surrounding Cassegrain focus on back of mirror cell assembly

Mass/Weight of Cassegrain Assembly:

Cassegrain rotator: 2.0 Metric tonnes/2.2 US Tons

Cable Wrap: 3.0 Metric tonnes/3.3 US Tons

Instrument Support Structure: 2.5 Metric tonnes/2.8 US Tons

Mass/Weight of Facility Instruments:

Adaptive Optics Unit (Altair): 0.9 Metric tonnes/0.99 US Tons

Calibration Unit: 0.9 Metric tonnes/0.99 US Tons

Acquisition and Guiding Unit: 1.8 Metric tonnes/2.0 US Tons

Total Weight of 3 Science Instruments: 6 Metric tonnes/6.6 US Tons

Total Weight of Cassegrain Assembly and all Instruments: 17.1 Metric tonnes/18.9 US

Tons

Number/Length of Cables in Cassegrain Wrap: 34 cables with total length of

0.85km/0.5miles

Number/Length of Helium, Glycol & Compressed Air Lines in Cassegrain Wrap: 14 with

total length of 0.35km/0.2miles

Total Length of Cables and Supply Lines to Telescope: 14.5km/8.9miles

Total Rotation Capacity of Cassegrain Rotator: +/- 270 degrees (540 degrees total)

Minimum Time for Cassegrain Rotator to Complete one Rotation: 108 seconds

(5 degrees/second)