What is this block of long, skinny rectangles in this New Horizons trajectory/operations simulation?

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This answer to What do all these vectors point to in this New Horizons trajectory/operations simulation? begins:

The software is definitely AGI's STK (notice the font and the states at the left top corner). There seem to be two or maybe three frames attached to the spacecraft.

Also shown are a block of long, skinny rectangles drawn against the celestial sphere, and these move around as the spacecraft's attitude changes.

Question: What is this block of long, skinny rectangles in this New Horizons trajectory/operations simulation?

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Video cued at 02:30; there is loud music at this point

@Fred whatever it is, it seems to be opposite the RTG and rotate along with the spacecraft. It also turns out that LORRI is opposite the RTG and rotates along with the spacecraft. Coincidence? — uhoh, Aug 01 '21 at 11:18
My system is having problems with that link: *The connection has timed out
The server at pluto.jhuapl.edu is taking too long to respond*. — Fred, Aug 01 '21 at 11:25
@Fred ya it's timing out for me also now, but it worked fine an hour ago. update: it's suddenly working for me now, but here's an image https://i.stack.imgur.com/Wv0om.jpg — uhoh, Aug 01 '21 at 11:47

score 2 · Accepted Answer · answered Aug 05 '21 at 22:30

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Those look like the instrument fields-of-view (FOVs).

Figure 7 of The New Horizons Spacecraft, Fountain et al. looks quite similar:

answered Aug 05 '21 at 22:30

BrendanLuke15

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They sure do! The instruments can't independently point themselves; their FOVs are permanently glued to the spacecraft's attitude. – uhoh Aug 05 '21 at 22:48

What is this block of long, skinny rectangles in this New Horizons trajectory/operations simulation?

Lower your volume before playing!

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