AO-73 – Funcube-1

Rotation Period

26 Jun 2020 = 31.4 seconds (from averaged panel temperatures)
27 Jun 2020 = 29.9 seconds (from averaged panel temperatures)
28 Jun 2020 = 29.1 seconds (from averaged panel temperatures)
29 Jun 2020 = 28.5 seconds (from averaged panel temperatures)
30 Jun 2020 = 27.5 seconds (from averaged panel temperatures)
01 Jul 2020 = 26.4 seconds (from averaged panel temperatures)
02 Jul 2020 = 25.7 seconds (from averaged panel temperatures)

AO-73 continues to rotate in the reverse of its normal spin direction with a high level of Nutation.

73 de Colin VK5HI.

AO-73 : Funcube-1

Rotation Period

19 Jun 2020 = 24.8 seconds (from averaged panel temperatures)
20 Jun 2020 = 26.0 seconds (from averaged panel temperatures)
21 Jun 2020 = 29.3 seconds (from averaged panel temperatures)
22 Jun 2020 = 29.3 seconds (from averaged panel temperatures)
23 Jun 2020 = 29.7 seconds (from averaged panel temperatures)
24 Jun 2020 = 32.1 seconds (from averaged panel temperatures)
25 Jun 2020 = 31.7 seconds (from averaged panel temperatures)

AO-73 continues to rotate in the reverse of its normal spin direction with a high level of Nutation.

73 de Colin VK5HI.

AO-73 : Funcube – 1

Rotation Period

12 Jun 2020 = 17.2 seconds (from averaged panel temperatures)
13 Jun 2020 = 20.3 seconds (from averaged panel temperatures)
14 Jun 2020 = 21.5 seconds (from averaged panel temperatures)
15 Jun 2020 = 22.1 seconds (from averaged panel temperatures)
16 Jun 2020 = 22.7 seconds (from averaged panel temperatures)
17 Jun 2020 = 23.9 seconds (from averaged panel temperatures)
18 Jun 2020 = 24.9 seconds (from averaged panel temperatures)

AO-73 was noted on the 14th June to have reversed its spin direction.
On all the early morning passes over VK AO-73 exhibit reverse spin.
On a random audit of the evening passes over VK, AO-73 has been observed doing what is known as The Dzhanibekov Effect ( changing rotation direction during the pass).
It is interesting to note that the evening passes over VK have just come out of eclipse prior to AOS, whereas the morning passes are now entering eclipse mid pass.

73 de Colin VK5HI.

AO-73 : Funcube – 1

Rotation Period

05 Jun 2020 = 20.4 seconds (from averaged panel temperatures)
06 Jun 2020 = 20.1 seconds (from averaged panel temperatures)
07 Jun 2020 = 19.2 seconds (from averaged panel temperatures)
08 Jun 2020 = 18.6 seconds (from averaged panel temperatures)
09 Jun 2020 = 17.8 seconds (from averaged panel temperatures)
10 Jun 2020 = 17.9 seconds (from averaged panel temperatures)
11 Jun 2020 = 16.5 seconds (from averaged panel temperatures)

AO-73 continues to maintain its tumbling phase due to its non-central Moment of Inertia.

73 de Colin VK5HI.

AO-73 : Funcube-1

Rotation Period

29 May 2020 = 20.9 seconds (from averaged panel temperatures)
30 May 2020 = 20.3 seconds (from averaged panel temperatures)
31 May 2020 = 20.0 seconds (from averaged panel temperatures)
01 Jun 2020 = 20.8 seconds (from averaged panel temperatures)
02 Jun 2020 = 21.2 seconds (from averaged panel temperatures)
03 Jun 2020 = 21.5 seconds (from averaged panel temperatures)
04 Jun 2020 = 21.1 seconds (from averaged panel temperatures)

This week AO-73 has commenced its complex tumbling phase due to its non-central Moment of Inertia.

73 de Colin VK5HI.

AO-73 : Funcube-1

Rotation Period

22 May 2020 = 30.5 seconds (from averaged panel temperatures)
23 May 2020 = 28.9 seconds (from averaged panel temperatures)
24 May 2020 = 26.8 seconds (from averaged panel temperatures)
25 May 2020 = 25.4 seconds (from averaged panel temperatures)
26 May 2020 = 23.8 seconds (from averaged panel temperatures)
27 May 2020 = 22.2 seconds (from averaged panel temperatures)
28 May 2020 = 21.5 seconds (from averaged panel temperatures)

AO-73 over the last week has exhibited increased Nutation with increasing rotational spin (reduced spin period).
This week we may see AO-73 commence tumbling due to its non-central Moment of Inertia.

73 de Colin VK5HI.

AO-73 : Funcube-1

Rotation Period

08 May 2020 = 89.9 seconds (from averaged panel temperatures)
09 May 2020 = 79.9 seconds (from averaged panel temperatures)
10 May 2020 = 72.1 seconds (from averaged panel temperatures)
11 May 2020 = 67.7 seconds (from averaged panel temperatures)
12 May 2020 = 62.3 seconds (from averaged panel temperatures)
13 May 2020 = 57.4 seconds (from averaged panel temperatures)
14 May 2020 = 53.4 seconds (from averaged panel temperatures)

AO-73 continues to maintain a very stable attitude and is spinning about the Z-Z axis with increasing Nutation.

73 de Colin VK5HI.

AO-73 : Funcube-1

Rotation Period

01 May 2020 = 139.3 seconds (from averaged panel temperatures)
02 May 2020 = 145.5 seconds (from averaged panel temperatures)
03 May 2020 = 127.3 seconds (from averaged panel temperatures)
04 May 2020 = 142.0 seconds (from averaged panel temperatures)
05 May 2020 = 113.6 seconds (from averaged panel temperatures)
06 May 2020 = 105.4 seconds (from averaged panel temperatures)
07 May 2020 = 95.5 seconds (from averaged panel temperatures)

AO-73 continues to maintain a very stable attitude and is spinning about the Z-Z axis with increasing Nutation.
On May 7th at 1650utc AO-73 again commenced eclipse periods with an eclipse of 12 seconds.
By May 14th they will have increased to 12 minutes per orbit.

73 de Colin VK5HI.

AO-73 : Funcube-1

Rotation Period

24 Apr 2020 = 315.0 seconds (from averaged panel temperatures)
25 Apr 2020 = 268.3 seconds (from averaged panel temperatures)
26 Apr 2020 = 230.0 seconds (from averaged panel temperatures)
27 Apr 2020 = 200.5 seconds (from averaged panel temperatures)
28 Apr 2020 = 176.0 seconds (from averaged panel temperatures)
29 Apr 2020 = 165.0 seconds (from averaged panel temperatures)
30 Apr 2020 = 161.0 seconds (from averaged panel temperatures)

AO-73 continues to maintain a very stable attitude and is spinning about the Z-Z axis with minimal Nutation.
On May 7th at 1650utc AO-73 will again experience eclipse periods with an eclipse of 12 seconds.
By May 14th they will have increased to 12 minutes per orbit.

73 de Colin VK5HI.