HST SM4 RSU / Gyroscope Replacement EVA
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Hubble was designed to use three of six onboard gyroscopes to meet its very precise pointing requirements, with the other three held as spares. Gyros have limited lifetimes, and three of the six (all installed in late-1999) are currently working. Following a thorough analysis and testing by engineers, it was determined that Hubble could operate productively on two gyros. After the implementation of three new control modes in Hubble's main computer, and major changes to Hubble's planning and scheduling system at the Space Telescope Science Institute, two-gyro operations began in 2005. By operating on two gyros, with the other gyro turned off (until needed), it is expected that Hubble can continue science operations through the end of 2008. With SM4 scheduled for mid-2008, a fresh set of six new gyros is needed to make the most of Hubble's new science instruments and lifetime peak performance through 2013. Each Rate Sensing Unit (RSU) contains two gyroscopes. Astronauts will replace all three RSUs giving Hubble a full compliment of six new gyroscopes.
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HST SM4 RSU / Gyroscope Replacement EVA completed and edited animation sequence.
Duration: 17.0 seconds
Available formats:
512x288 (29.97 fps)
MPEG-4
25 MB
320x180
PNG
224 KB
160x80
PNG
57 KB
80x40
PNG
15 KB
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Animated sequence depicts the replacement of three Rate Sensing Units (RSU) containing gyroscopes during Hubble Space Telescope Servicing Mission 4.
Duration: 6.0 seconds
Available formats:
1920x1080 (60 fps)
Frames
(Inst Trk A)
320x180
PNG
246 KB
640x360 (29.97 fps)
MPEG-1
1 MB
How to play our movies
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Animated sequence depicts the replacement of three Rate Sensing Units (RSU) containing gyroscopes during Hubble Space Telescope Servicing Mission 4.
Duration: 8.0 seconds
Available formats:
320x180
PNG
296 KB
640x360 (29.97 fps)
MPEG-1
2 MB
1920x1080 (60 fps)
Frames
(RSU Install Cable)
How to play our movies
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Animated sequence depicts the replacement of three Rate Sensing Units (RSU) containing gyroscopes during Hubble Space Telescope Servicing Mission 4.
Duration: 3.0 seconds
Available formats:
1920x1080 (60 fps)
Frames
(RSU Hold)
512x288 (30 fps)
MPEG-1
2 MB
320x180
PNG
230 KB
How to play our movies
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Animated sequence depicts the replacement of three Rate Sensing Units (RSU) containing gyroscopes during Hubble Space Telescope Servicing Mission 4.
Duration: 5.0 seconds
Available formats:
1920x1080 (60 fps)
Frames
(RSU Box)
512x288 (30 fps)
MPEG-1
5 MB
320x180
PNG
221 KB
How to play our movies
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