AO-73 : Funcube 1

Spin Period

08 Feb 2019 = 17.4 seconds (from averaged panel temperatures)
09 Feb 2019 = 16.5 seconds (from averaged panel temperatures)
10 Feb 2019 = 17.4 seconds (from averaged panel temperatures)
11 Feb 2019 = 17.0 seconds (from averaged panel temperatures)
12 Feb 2019 = 17.6 seconds (from averaged panel temperatures)
13 Feb 2019 = 18.6 seconds (from averaged panel temperatures)
14 Feb 2019 = 21.3 seconds (from averaged panel temperatures)

On the 12th February AO-73 started to tumble.
It is now tumbling in a complex rotational sequence suggesting “spin reversal” but that is not actually occurring.

73 de Colin VK5HI.

AO-73 : Funcube 1

Spin Period

Thanks to Terry VK5GU for download and analysis and Colin VK3HBF for his download support to Terry while I was on holidays.

25 Jan 2019 = 36.5 seconds (from averaged panel temperatures)
26 Jan 2019 = 34.1 seconds (from averaged panel temperatures)
27 Jan 2019 = 32.4 seconds (from averaged panel temperatures)
28 Jan 2019 = 30.4 seconds (from averaged panel temperatures)
29 Jan 2019 = 28.1 seconds (from averaged panel temperatures)
30 Jan 2019 = 26.4 seconds (from averaged panel temperatures)
31 Jan 2019 = 24.7 seconds (from averaged panel temperatures)

AO-73 is spinning about the Z-Z axis with minimal Nutation.

73 de Colin VK5HI.

AO-73 Funcube-1

Spin Period

04 Jan 2019 = 31.5 seconds (from sun sensors)
05 Jan 2019 = 45.0 seconds (from sun sensors)
06 Jan 2019 = 90.0 seconds (from sun sensors)
07 Jan 2019 = 96.5 seconds (from sun sensors)
08 Jan 2019 = 120.2 seconds (from sun sensors)
09 Jan 2019 = 176.3 seconds (from averaged panel temperatures)
10 Jan 2019 = 114.8 seconds (from averaged panel temperatures)

This week’s change back to Educational Mode has seen a marked change in the Spin Period.
AO-73 is spinning about the Z-Z axis with minimal Nutation.

73 de Colin VK5HI.

AO-73 Funcube-1

Spin Period

28 Dec 2018 = 25.5 seconds (from sun sensors)
29 Dec 2018 = 27.5 seconds (from sun sensors)
30 Dec 2018 = 28.5 seconds (from sun sensors)
31 Dec 2018 = 34.0 seconds (from sun sensors)
01 Jan 2019 = 39.5 seconds (from sun sensors)
02 Jan 2019 = 40.8 seconds (from sun sensors) Tnx Colin VK3HBF.
03 Jan 2019 = 36.0 seconds (from sun sensors)

For the first three days AO-73 continued to take turns rotating about a different axis.
It then commenced rotating about the normal Z-Z axis, with Nutation.
Over VK it has been rotating with short term reversed spin from the flip cycle.
Due to the aliasing noted in previous analysis of the WOD’s and the gaps in the current WOD
uploads I have been unable to quantify how far into the pass the reverse spin continues.

73 de Colin VK5HI.

AO-73 Funcube-1

Spin Period

21 Dec 2018 = 16.2 seconds (from sun sensors)
22 Dec 2018 = 17.5 seconds (from sun sensors)
23 Dec 2018 = 19.6 seconds (from sun sensors)
24 Dec 2018 = 21.3 seconds (from sun sensors)
25 Dec 2018 = 21.0 seconds (from sun sensors)
26 Dec 2018 = 24.7 seconds (from sun sensors)
27 Dec 2018 = 23.5 seconds (from sun sensors) Tnx Colin VK3HBF.

AO-73 has been taking turn to rotate about a different axis each day this week.
It has not as yet commenced to tumble.

Wishing you all a Prosperous and Safe New Year

73 de Colin VK5HI.

AO-73 Funcube-1

Spin Period

14 Dec 2018 = 16.6 seconds (from averaged panel temperatures)
15 Dec 2018 = 16.1 seconds (from averaged panel temperatures)
16 Dec 2018 = 15.7 seconds (from averaged panel temperatures)
17 Dec 2018 = 14.6 seconds (from averaged panel temperatures) lowest recorded
18 Dec 2018 = 15.1 seconds (from averaged panel temperatures)
19 Dec 2018 = 14.8 seconds (from sun sensors)
20 Dec 2018 = 15.7 seconds (from sun sensors) Tnx Colin VK3HBF.

AO-73’s Nutation has increased significantly this week.
It would now appear that AO-73 is “maintaining” a minimum spin period.
It has not as yet commenced to tumble.

A Very Merry Christmas to All.

73 de Colin VK5HI.

AO-73 Funcube-1


Spin Period

07 Dec 2018 = 21.5 seconds (from averaged panel temperatures)
08 Dec 2018 = 20.3 seconds (from averaged panel temperatures)
09 Dec 2018 = 19.6 seconds (from averaged panel temperatures)
10 Dec 2018 = 19.2 seconds (from averaged panel temperatures)
11 Dec 2018 = 18.7 seconds (from averaged panel temperatures)
12 Dec 2018 = 17.9 seconds (from averaged panel temperatures)
13 Dec 2018 = 17.4 seconds (from averaged panel temperatures)

The spin period of AO-73 has slowed markedly this last week and the Nutation has increased significantly.
This behaviour was predicted in a previous note some weeks back.
The flip at the magnetic poles, Moment Of Inertia plus higher speed.
Valuable data collected from the educational phase.
Thanks to the AMSAT-UK team, it was worth the effort.
Back to Transponder Mode later today.
Interesting weeks ahead.

73 Colin VK5HI.

AO-73 Funcube 1

Spin Period

23 Nov 2018 = 49.1 seconds (from averaged panel temperatures)
24 Nov 2018 = 46.4 seconds (from averaged panel temperatures)
25 Nov 2018 = 43.6 seconds (from averaged panel temperatures)
26 Nov 2018 = 41.5 seconds (from averaged panel temperatures)
27 Nov 2018 = 39.0 seconds (from averaged panel temperatures)
28 Nov 2018 = 36.8 seconds (from averaged panel temperatures)
29 Nov 2018 = 34.5 seconds (from averaged panel temperatures)

AO-73 continues to slowly increase in speed albeit with increasing Nutation.

73. Colin VK5HI.

AO-73 Funcube-1

Spin Period

09 Nov 2018 = 111.6 seconds (from averaged panel temperatures)
10 Nov 2018 = 105.6 seconds (from averaged panel temperatures)
11 Nov 2018 = 98.8 seconds (from averaged panel temperatures)
12 Nov 2018 = 92.7 seconds (from averaged panel temperatures)
13 Nov 2018 = 86.4 seconds (from averaged panel temperatures)
14 Nov 2018 = 81.7 seconds (from averaged panel temperatures)
15 Nov 2018 = 77.6 seconds (from averaged panel temperatures)

73. Colin VK5HI.

AO-73 Funcube-1


Spin Period

01 Nov 2018 = 152.8 seconds (from averaged panel temperatures)
02 Nov 2018 = 181.6 seconds (from averaged panel temperatures)
03 Nov 2018 = 194.7 seconds (from averaged panel temperatures)
04 Nov 2018 = 149.1 seconds (from averaged panel temperatures)
05 Nov 2018 = 132.3 seconds (from averaged panel temperatures)
06 Nov 2018 = 144.3 seconds (from averaged panel temperatures)
07 Nov 2018 = 127.3 seconds (from averaged panel temperatures)
08 Nov 2018 = 127.3 seconds (from averaged panel temperatures)

This week I have been researching the significant variance in daily spin rates.
At this point I have not settled on any conclusions, but am in the process of investigating a number of new theories.
73. Colin VK5HI.