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The HETE ACS cameras are essentially copies of the
HETE-1 UV cameras: the primary differences are that the CCDs
are smaller (.5 sq. cm vs 4 sq. cm), they are not
UV sensitive (the filter will be optimized for R band),
and they are tilted 45 degrees from the spacecraft z-axis and
therefore will not make any scientific contribution to the
The image at left is of an engineering model ACS camera without any of the thermal shielding or struts which mount the camera to the spacecraft.
The HETE boresight cameras are a new set of optical cameras
devoted entirely to supplying good aspect for the SXC system.
The boresight cameras are mounted to the SXC baseplate, making
thermal variations in pointing negligible.
The boresight cameras use the same CCDs as the ACS cameras, but a lens with a longer focal length: the boresight camera field-of-view measures 5.5 degrees on a side, as opposed to the ACS cameras' 12.5 degrees on a side. The boresight cameras are optimized for the blue region of the spectrum to minimize the effect of scattered moonlight.
The image at left is of an engineering model boresight camera before it is mounted to the SXC baseplate .