AO-73 : Funcube-1

Spin Period
07 Jun 2019 = 132.3 seconds (from averaged panel temperatures)
08 Jun 2019 = 144.3 seconds (from averaged panel temperatures)
09 Jun 2019 = 162.6 seconds (from averaged panel temperatures)
10 Jun 2019 = 151.6 seconds (from averaged panel temperatures)
11 Jun 2019 = 134.7 seconds (from averaged panel temperatures)
12 Jun 2019 = 143.6 seconds (from averaged panel temperatures)
13 Jun 2019 = 157.1 seconds (from averaged panel temperatures)

During the week Dave G4DPZ downloaded the last 3 weeks of WOD’s for me to analyse.
Having analysed each orbit for the 22nd, 23rd, 24th and 25th May and calculated the spin
period using the +X Panel Temperature I now “appreciate” what is happening during each
orbit of AO-73. The reasoning as to “why” it is happening requires further research.

73 de Colin VK5HI.

AO-73 : Funcube-1

Spin Period
24 May 2019 = 193.0 seconds (from averaged panel temperatures)
25 May 2019 = 160.7 seconds (from averaged panel temperatures)
26 May 2019 = 148.5 seconds (from averaged panel temperatures)
27 May 2019 = 137.3 seconds (from averaged panel temperatures)
28 May 2019 = 182.4 seconds (from averaged panel temperatures)
29 May 2019 = 162.6 seconds (from averaged panel temperatures)
30 May 2019 = 133.5 seconds (from averaged panel temperatures)

As AO-73 has gradually encountered greater eclipse periods it has developed a cyclic spin period.
Strongly suspect propeller effect and relative point of observation (time and location).
From previous analysis of WOD’s we know spin can vary throughout a 24 hour period.
Will investigate further.

73 de Colin VK5HI.

AO-73 : Funcube-1

Spin Period

17 May 2019 = 176.8seconds (from averaged panel temperatures)
18 May 2019 = 168.0 seconds (from averaged panel temperatures)
19 May 2019 = 148.5 seconds (from averaged panel temperatures)
20 May 2019 = 149.2 seconds (from averaged panel temperatures)
21 May 2019 = 147.0 seconds (from averaged panel temperatures)
22 May 2019 = 135.2 seconds (from averaged panel temperatures)
23 May 2019 = 190.5 seconds (from averaged panel temperatures)

Have no explanation for the sudden change in spin period on 23rd May.
Any commands issued over the last couple of days, abnormal high currents, whatever ??

As of today (23rd May) we now experiencing 18.0 minute eclipse periods per orbit.
Come early June we will stabilise at 20 minutes per orbit until early July when the
eclipse periods again shorten such that we again enter full sun on the 9th August.

73 de Colin VK5HI.

AO-73 – Funcube 1

Spin Period

10 May 2019 = 39.5 seconds (from averaged panel temperatures)
11 May 2019 = 60.6 seconds (from averaged panel temperatures)
12 May 2019 = 96.4 seconds (from averaged panel temperatures)
13 May 2019 = 166.5 seconds (from averaged panel temperatures)
14 May 2019 = 176.7 seconds (from averaged panel temperatures)
15 May 2019 = 178.0 seconds (from averaged panel temperatures)
16 May 2019 = 188.8 seconds (from averaged panel temperatures)

As of today (16th May) we now experiencing 15.5 minute eclipse periods per orbit.
Come early June we will stabilise at 20 minutes per orbit until early July when the
eclipse periods again shorten such that we again enter full sun on the 9th August.

In recent days AO-73 has achieved stable spin about the Z-Z axis with minimal Nutation.

73 de Colin VK5HI.

AO-73 : Funcube-1

Spin Period

03 May 2019 = 16.8 seconds (from averaged panel temperatures)
04 May 2019 = 18.8 seconds (from averaged panel temperatures)
05 May 2019 = 19.5 seconds (from averaged panel temperatures)
06 May 2019 = 20.0 seconds (from Sun Sensor Data)
07 May 2019 = 23.6 seconds (from averaged panel temperatures)
08 May 2019 = 26.7 seconds (from averaged panel temperatures)
09 May 2019 = 28.1 seconds (from averaged panel temperatures)

As of today (9th May) we are experiencing 12 minute eclipse periods per orbit.
Come early June we will stabilise at 20 minutes per orbit until early July when the
eclipse periods again shorten such that we again enter full sun on the 9th August.

73 de Colin VK5HI.

AO-73 : Funcube-1

Spin Period

26 Apr 2019 = 19.3 seconds (from averaged panel temperatures)
27 Apr 2019 = 18.2 seconds (from averaged panel temperatures)
28 Apr 2019 = 17.6 seconds (from averaged panel temperatures)
29 Apr 2019 = 16.9 seconds (from averaged panel temperatures)
30 Apr 2019 = 16.5 seconds (from averaged panel temperatures)
01 May 2019 = 15.8 seconds (from averaged panel temperatures)
02 May 2019 = 15.6 seconds (from averaged panel temperatures)

On the 28th April, AO-73 entered into eclipse periods once again.
As of today (3rd May) we are experiencing 8 minute eclipse periods per orbit.

73 de Colin VK5HI.

AO-73 Funcube-1

Spin Period

19 Apr 2019 = 27.8 seconds (from averaged panel temperatures)
20 Apr 2019 = 27.1 seconds (from averaged panel temperatures)
21 Apr 2019 = 25.8 seconds (from averaged panel temperatures)
22 Apr 2019 = 24.3 seconds (from averaged panel temperatures)
23 Apr 2019 = 22.7 seconds (from averaged panel temperatures)
24 Apr 2019 = 21.2 seconds (from averaged panel temperatures)
25 Apr 2019 = 20.0 seconds (from averaged panel temperatures)

73 de Colin VK5HI.

AO-73 spin period

Spin Period
5 Apr 2019 = 35.8 Seconds (from averaged panel temperatures)
6 Apr 2019 = 43.1 Seconds (from averaged panel temperatures)
7 Apr 2019 = 50.7 Seconds (from averaged panel temperatures)
8 Apr 2019 = 53.0 Seconds (from averaged panel temperatures)
9 Apr 2019 = 52.5 Seconds (from averaged panel temperatures)
10 Apr 2019 = 51.5 Seconds (from averaged panel temperatures)
11 Apr 2019 = 48.9 Seconds (from averaged panel temperatures)
73 de Terry for Colin VK5HI.

AO-73 : Funcube – 1

Spin Period

22 Mar 2019 = 34.8 seconds (from averaged panel temperatures)
23 Mar 2019 = 32.5 seconds (from averaged panel temperatures)
24 Mar 2019 = 30.2 seconds (from averaged panel temperatures)
25 Mar 2019 = 28.3 seconds (from averaged panel temperatures)
26 Mar 2019 = 26.1 seconds (from averaged panel temperatures)
27 Mar 2019 = 24.2 seconds (from averaged panel temperatures)
28 Mar 2019 = 22.7 seconds (from averaged panel temperatures)

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

73 de Colin VK5HI.

AO-73 : Funcube-1

Spin Period

15 Mar 2019 = 58.1 seconds (from averaged panel temperatures)
16 Mar 2019 = 54.2 seconds (from averaged panel temperatures)
17 Mar 2019 = 50.5 seconds (from averaged panel temperatures)
18 Mar 2019 = 46.8 seconds (from averaged panel temperatures)
19 Mar 2019 = 43.6 seconds (from averaged panel temperatures)
20 Mar 2019 = 40.5 seconds (from averaged panel temperatures)
21 Mar 2019 = 37.4 seconds (from averaged panel temperatures)

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

73 de Colin VK5HI.