AO-73 : Funvube-1

Rotation Period

18 Dec 2020 = 948 seconds (from WOD panel temperatures)
19 Dec 2020 = 880 seconds (from WOD panel temperatures)
20 Dec 2020 = 842 seconds (from WOD panel temperatures)
21 Dec 2020 = 812 seconds (from WOD panel temperatures)
22 Dec 2020 = 824 seconds (from WOD panel temperatures)
23 Dec 2020 = 827 seconds (from WOD panel temperatures)
24 Dec 2020 = 814 seconds (from WOD panel temperatures)

For the last week AO-73 has been spinning about the Z-Z axis with minimal Nutation.

73 de Colin VK5HI.

ARISS SSTV event

An ARISS Slow Scan TV (SSTV) event is scheduled from the International Space Station (ISS). This will be a special SSTV event to celebrate the 20th anniversary of ARISS onboard the International Space Station. The event is scheduled to begin on December 24 at 16:40 UTC and continue through December 31 ending at 18:15 UTC. Dates are subject to change due to ISS operational adjustments.

Images will be downlinked at 145.8 MHz +/- 3 KHz for Doppler shift and the expected SSTV mode of operation is PD 120. Radio enthusiasts participating in the event can post images they receive at the ARISS SSTV Gallery at https://www.spaceflightsoftware.com/ARISS_SSTV/ .

After your image is posted at the gallery, you can acquire a special award by linking to https://ariss.pzk.org.pl/sstv/ and follow directions for submitting a digital copy of your received image.

PSAT-1 digipeater enabled

just switched the APRS digipeater ON

1:Fm PSAT-1 To APOFF Via ARISS [UTC:10:10:18R]
T#045,822,069,866,606,723,00011100
1:Fm PSAT-1 To APOFF Via ARISS
[UTC:10:10:49R]
s#016958,0z001
1:Fm PSAT-1 To APOFF Via ARISS
[UTC:10:11:19R]
T#046,831,073,868,604,723,00011100
1:Fm PSAT-1 To APOFF Via ARISS
[UTC:10:11:48R]
s#016959,0z001
1:Fm PSAT-1 To APOFF Via ARISS
[UTC:10:11:50R]
Hi!
1:Fm PSAT-1 To APOFF Via ARISS
[UTC:10:11:53R]
PS=0
1:Fm PSAT To APRSON Via ARISS [UTC:10:11:55R]
T#047,817,083,870,600,379,00011000

1:Fm PSAT To APRSON Via ARISS
[UTC:10:12:51R]
S#016960,0z000
1:Fm PSAT To APRSON Via ARISS
[UTC:10:12:56R]
T#048,819,085,871,597,379,00011000

AO-73 : Funcube-1

Rotation Period

11 Dec 2020 = 1837 seconds (from WOD panel temperatures)
12 Dec 2020 = 2021 seconds (from WOD panel temperatures)
13 Dec 2020 = 1661 seconds (from WOD panel temperatures)
14 Dec 2020 = 1550 seconds (from WOD panel temperatures)
15 Dec 2020 = 1267 seconds (from WOD panel temperatures)
16 Dec 2020 = 1136 seconds (from WOD panel temperatures)
17 Dec 2020 = 1020 seconds (from WOD panel temperatures)

For the last five days AO-73 has been spinning about the Z-Z axis with minimal Nutation and the spin rate has increased steadily each day.

73 de Colin VK5HI.

AO-73 : Funcube-1

Rotation Period

04 Dec 2020 = 2655 seconds (from WOD panel temperatures)
05 Dec 2020 = 2760 seconds (from WOD panel temperatures) Reverse Spin
06 Dec 2020 = 3735 seconds (from WOD panel temperatures) Reverse Spin
07 Dec 2020 = 4500 seconds (from WOD panel temperatures) Best Estimate
08 Dec 2020 = 4200 seconds (from WOD panel temperatures) Best Estimate
09 Dec 2020 = 3300 seconds (from WOD panel temperatures) Best Estimate
10 Dec 2020 = 2153 seconds (from WOD panel temperatures)

This week’s analysis has indeed been very interesting.
For December 4th to 6th I used 24hour WOD’s supplied by Dave from the Warehouse Data to ascertain what was occurring with AO-73.
Late on the UTC day of the 4th AO-73 went into an attitude that indicated it was rotating about the Z-Z axis but the Z-Z axis was inclined at an angle to the normal direction of travel such that the -X and +Y planes were more illuminated than the +x and -Y planes. (Supposition on my part. Alternate theories welcome.)
Then later on the UTC day of the 5th December AO-73 resumed a more normal attitude but with reverse spin. Refer graphic below.

For the 7th to 9th December I have only had the retrieved WOD’s from the real-time telemetry to work with, hence my theoretical best estimates as AO-73 appears to have been in this complex attitude.
Fortunately the download over VK for the 10th December shows AO-73 has again stabilised with normal spin about the Z-Z axis. (Graphic below)

73 de Colin VK5HI.