Very interesting, Alex! Thank you for sharing that video. 73,
Mark N8MH At 08:37 PM 7/14/2010 +0200, Alexandru Csete wrote: >Greetings, > >I ran a simulation using the Celestia space simulator and could indeed >observe a partial solar eclipse as seen from AO-51 :) >I have recorded the simulation to a video and you can watch it on >Youtube: >http://www.youtube.com/watch?v=7ET8BhbqmVk > >I couldn't find any 3d model of AO-51 so I used a model of AO-7 - sorry >for that. Also note that I used TLEs from today to generate orbital >data for Celestia so the time and may not be scientifically accurate. > >If you want to run the simulation for yourself, watch from other >angles, etc., you can get Celestia for free from >http://shatters.net/celestia/ >You'll need to add the data files for AO-51 in the "extras" folder; >you can use mine to begin with. There is a .zip file here: >http://files.oz9aec.net/video/SolarEclipse/ > >You'll also find the H.264 encoded video there that you are free to >download (~100MB). > >73 >Alex Oz9AEC > > >On Tue, 13 Jul 2010 13:10:41 -0400 >"Mark L. Hammond" <[email protected]> wrote: > >> Hello Masahiro, >> >> Thank you for your message! You have made a great observation, and I >> think you are exactly right about the cause of the observed "glitches" >> in the telemetry. Usually at this point in its orbit we would observe >> AO-51 charging its batteries at a steady rate from fully illuminated >> panels. >> >> >From what I've read from page 43 here: >> http://eclipse.gsfc.nasa.gov/SEpubs/2010/TP214171a.pdf the eclipse >> was from 18:15 to 20:52 UTC. Look also at the areas experiencing >> eclipse. >> >> Please be aware that the "clock" on AO-51 runs fast. It is now about >> 3 minutes fast, so look at telemetry timestamped from about 18:18 >> until 20:55 UTC. >> >> Since the duration of the solar eclipse was 2 hrs 39 min (or 159 mins) >> and AO-51 orbits every 100 minutes or so, it could have been affected >> two times. >> >> I've plotted some of the telemetry collected from that period >> (telemetry from 1800-2130utc) and posted it here: >> http://www.amsat.org/amsat/ftp/telemetry/ao51/2010WOD/July2010/Wd071100_1800to2130utc_solar_eclipse.xls >> >> And here's a screenshot of AO-51 at the time: >> http://www.amsat.org/amsat/ftp/telemetry/ao51/2010WOD/July2010/ao51_11July2010_2045utc_solar_eclipse.jpg >> >> 73! >> >> Mark N8MH >> >> >> >> 2010/7/13 Masahiro Arai <[email protected]>: >> > >> > Total solar eclipse was observed in southern Pacific Ocean at 11th >> > July. I checked AO-51 WOD file. Total Array I shows glitch at >> > 2043-2045z. AO-51 was located on east of Argentina at the time. Is >> > this glitch made with solar eclipse?? >> > >> > >> > AO-51 Wd071100 >> > 2010/7/11 >> > UTC   Total Array I [mA] >> > 20:35  -2.111 >> > 20:36  -0.323 >> > 20:37  -0.323 >> > 20:38   1.465 >> > 20:39  -0.323 >> > 20:40  528.851 >> > 20:41  321.472 >> > 20:42  307.170 >> > 20:43  183.815 >> > 20:44  190.966 >> > 20:45  176.664 >> > 20:46  249.962 >> > 20:47  300.019 >> > 20:48  396.557 >> > 20:49  498.459 >> > 20:50  519.912 >> > 20:51  729.079 >> > 20:52  634.328 >> > 20:53  936.458 >> > 20:54  843.495 >> > 20:55  948.972 >> > >> > >> > WOD file >> > ftp://ftp.amsat.org/pub/amsat/telemetry/ao51/2010WOD/July2010/Wd071100 >> > >> > AO-51 WOD decoder >> > http://tinyurl.com/DK3WNsoftware >> > >> > >> > 73 >> > >> > Masa  JN1GKZ   Tokyo Japan >> > >> > >> > >> > _______________________________________________ >> > Sent via [email protected]. Opinions expressed are those of the >> > author. Not an AMSAT-NA member? Join now to support the amateur >> > satellite program! Subscription settings: >> > http://amsat.org/mailman/listinfo/amsat-bb >> > >> >> >> Mark L. Hammond [N8MH] _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
