[amsat-bb] Juno: http://www.jpl.nasa.gov/hijuno/
Sounds like fun! Tom KJ4EAW ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: Thought experiment ... Rockets and balloons
Easy to check to a first order estimate - just calculate total energy by calculating payload mass raised to orbital height (potential energy) and accelerated to orbital velocity (kinetic), then figure what fraction of that is associated with raising the 37km fraction of the way. Because of the v**2 term in the velocity, the height contribution probably wouldn't be much. Tom On Sep 18, 2013, at 1:01 PM, Rob pabut...@gmail.com wrote: I'm not a rocket scientist but I have an active imagination . Thinking of a recent XKCD to achieve orbit the hard part isn't the altitude it's the velocity Would there be any advantage (cost effective) carrying a launch vehicle say to 37KM ... think Red Bull Stratos and firing the engines there??? So you're already 37KM up there's a lot less atmospheric drag This would be like a drop from a plane ... but even higher Thoughts??? de KA2PBT ___ Sent via AMSAT-BB@amsat.org. 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 ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: SpaceX / Falcon 9 Dragon sighting
Solar array covers? http://nasatech.net/ntF9DRAGON-COTS2-3_PAGE.html Tom KJ4EAW On May 22, 2012, at 2:55 AM, Armando Mercado am25...@triton.net wrote: Hello, Falcon 9/Dragon was sighted from West Michigan. It (they) were about 15 mins behind the ISS. There were 4 objects total, 1 object in front was of steady brightness approximately 1st magitude. This was the Dragon I think. The other three were tumbling shinning from 1 to 4 magitude at about one flash per 3 seconds. One object would be the booster, don't know what the other 2 would be. Everything passed about 3 degrees north of Altair at 0927UTC. Good luck Dragon. ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: ARISSat-1 (37772) decay
Do we really expect the temp to get substantially higher before it begins to tumble? Just sort of thinking about putting my hand out the window of my car, there's a lot of aero force before it gets hot... Tom KJ4EAW On Dec 31, 2011, at 9:46 AM, Nico Janssen ham...@xs4all.nl wrote: Hi, My prediction for the decay of ARISSat 1 still stays on the same date: January 4 +/- 1 day. As the aerodynamic drag increases, the telemetry of the satellite should show ever higher temperatures in the coming days. Especially interesting is the data from the Kursk experiment, that measures the density of the air around the satellite. Happy New Year to all! 73, Nico PA0DLO On 2011-12-22 16:15, Nico Janssen wrote: Hi, My current prediction for the decay of ARISSat 1 is January 4, 2012, +/- 3 days. If solar and geomagnetic activity really increase before the end of December, as some predictions suggest, the decay may be a few days earlier. 73, Nico PA0DLO On 2011-12-11 15:24, Nico Janssen wrote: Hi, Solar activity has remained at relatively low levels. There have not been any M or X class solar flares nor magnetic storms in the past several weeks. As a result, the expected decay date of ARISSat 1 has shifted into January. It is now to be expected around January 3, but depending on solar activity it may be more than 5 days later or earlier. 73, Nico PA0DLO On 2011-11-28 21:36, Nico Janssen wrote: Hi, With its relatively high area to mass ratio, ARISSat 1 is quite sensitive to space weather changes. In the past two weeks solar flux values have been relatively low, around 140, while they were around 180 in the weeks before. Also there have not been any magnetic storms. As a result of this low solar activity, the expected decay date of ARISSat 1 has now slipped to the end of December. My current prediction is 27 December. But if solar activity stays at these low levels, the decay date will even shift into early January. So it is still too early to make any sensible predictions. 73, Nico PA0DLO On 2011-11-18 15:05, Nico Janssen wrote: Hi, So far all my analyses of the evolution of the orbit of ARISSat 1 have resulted in a predicted decay date sometime in December 2011. Actually my current predicted decay date for this satellite is December 17. Obviously it depends very much on how solar activity develops in the coming weeks. So now we have seen decay predictions ranging from December 2011 to April 2012. Let's see how we converge to the actual decay date. 73, Nico PA0DLO ___ Sent via AMSAT-BB@amsat.org. 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 ___ Sent via AMSAT-BB@amsat.org. 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 ___ Sent via AMSAT-BB@amsat.org. 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 ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Re: STS-134
There's a good bunch of hams in the area that cover just about all of the Cape launches and rebroadcast the countdown nets on a local repeater. You can get the skinny at http://www.lisats.org/. I was able to view a shuttle launch a while back from next to the VAB, and had my little VX-3 tuned to their freq. I was consistently up to date on holds, issues, and the like. 73s Tom Williams KJ4EAW On Apr 21, 2011, at 8:26 AM, Bobby Lacey am...@duaneallman.net wrote: I will be down at KSC to cover Endeavour's last launch from the press site next week, and I was just wondering if any hams on the list would be making the trip down to the cape? The white house announced yesterday that POTUS will be attending this launch, so security may be interesting. I'll be tweeting and posting photos of RSS retraction + launch. http://www.twitter.com/kf4gta http://www.flickr.com/photos/rllacey 73 Bobby KF4GTA ___ Sent via AMSAT-BB@amsat.org. 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 ___ Sent via AMSAT-BB@amsat.org. 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
[amsat-bb] Decode FASTRAC TLM w/ VX8R?
Before I go fiddle with my Yaesu VX8R, does anyone know if it'll decode and display FASTRAC TLM? Thanks, Tom Williams KJ4EAW ___ Sent via amsat...@amsat.org. 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
