All,
Detailed doppler measurements show that AMSAT-OSCAR 91 (AO 91)
is object 43017, 2017-073E.
There is a small frequency drift on the downlink of OSCAR 91. During
ascending passes, i.e. early afternoon passes from south to north, with
the satellite in full sunlight, the downlink shows a frequency drift of
about -19 Hz per minute.
73,
Nico PA0DLO