Previously known as NOAA L
The APT system failed in Sep 2001 (once the antenna connection was switched
off, it couldn't be correctly re-connected after). Since 9 Oct 2001, the HRPT
frequency was changed at 1698 MHz and is operating at full power.
On 25 Nov 2015 debris were detected, raising the fear of an in-orbit breakup.
There was an explosion and over 130 debris found.
off after anomaly