Star Tracker Mounting PointsMechanical
Interface Drawing
Dimensions with No Baffle
Dimensions with Short Rigid Baffle
Mass Properties
Star Tracker Mass with No Baffle (-0-), including dust cap
| 85.0 g ± 1.0
| Star Tracker Mass with Short Rigid Baffle (-1-)
| 157.5 g ± 1.0
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The mass does not include any connector saver, mating connector, or mounting hardware.
Star Tracker Mounting Points
The star tracker attaches to the host spacecraft with a stable three-point mount. Three through-hole mounting points are provided. These are 3.1 mm in diameter, and are intended to accept M3 hardware. #4 hardware is also acceptable if preferred by the customer. Washers or screw heads should be no more than 8 mm in diameter. The use of soft plastic washers is recommended for non-flight mounting to avoid marring the star tracker surface.
The body of the star tracker is made from aluminum. The bulk of it is black anodized, but the bottoms of the three mounting feet have yellow chemical conversion coating. This material is electrically conductive, and is used as the grounding path for the device. Note that the mounting screws will bear on the anodized top surface, and so the screws are not guaranteed to be grounded on the star tracker side.
In addition to the three screws there is provision to accept two alignment pins. These pins should be precision M2. The flat mounting surface on the spacecraft defines a plane, and the pins then constrain the rotation of the star tracker within this plane.
The star tracker structure is a snug fit on the pins, as is necessary for tight tolerance. The pins may cause some marring of the anodize coating in the star tracker alignment grooves. This is normal. When removing the star tracker from a pinned mounting be careful to withdraw it without any rotation which could cause it to bind. When building GSE mounting plates it may be useful to add holes to the bottom to allow the star tracker to be gently ejected.
Date: 2015-12-17; view: 709
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