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On the HiRISE map, you can display the footprints of prior observations. What is the size in kilometers of these footprints?

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HiRISE uses "pushbroom" imaging so the length of the footprint is variable depending on the length of "Time Delay and Integration" (TDI) used in a given observation.

However, the latest MRO HiRISE instrument SPICE kernel (ik) from NAIF (v12) suggests:

At the nominal 300 km MRO orbital altitude the instrument can acquire image swaths of approximately 6 kilometers cross-orbit and 20 kilometers along-orbit.

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