The plot shows the time interval between consecutive TLEs (in days) for the HST in space-track.org. The blue line is all points and the black line is a rolling average of 100 points. It seems to suddenly jump from about 0.7 day to 2 days between TLEs in May 2009 (JD ~ 2,454,960) , then slowly increase in frequency, until August 2015 when it drops back down to about 0.7 days (JD ~ 2,457,285).
Do these changes (and this pattern) reflect anything of significance? Budget cuts? Shifts in Observing Program requirements? USSTRATCOM busy?
Data from 2000-01-01 to present:
These plots are intervals (days) between successive TLEs, not TLEs/day
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