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CX2SA > SATDIG 26.05.10 20:20l 584 Lines 20065 Bytes #999 (0) @ WW
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Subj: AMSAT-BB-digest V5 238
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To : SATDIG@WW
Today's Topics:
1. Re: 'Zombie-sat' and the clever orbital dance
(Vince Fiscus, KB7ADL)
2. W1AW/5 for DM73 Wednesday (Mark Spencer)
3. Re: 'Zombie-sat' and the clever orbital dance (Greg D.)
4. Re: 'Zombie-sat' and the clever orbital dance (Luc Leblanc)
5. "sustainable satellite" Cube sat (Luc Leblanc)
6. XE1/VE3OQC QRT, VE7OQC coming this fall
(Patrick STODDARD (WD9EWK/VA7EWK))
7. 13 Original Colonies Special Event (Dave Webb KB1PVH)
8. Re: 13 Original Colonies Special Event (davekn4ok@xxx.xxxx
9. Re: 'Zombie-sat' and the clever orbital dance (Bruce Bostwick)
10. Re: 'Zombie-sat' and the clever orbital dance (Bill Jones)
11. AKATSUKI and IKAROS received in Bochum (Trevor .)
----------------------------------------------------------------------
Message: 1
Date: Tue, 25 May 2010 14:16:00 -0600
From: "Vince Fiscus, KB7ADL" <vlfiscus@xxx.xxx>
Subject: [amsat-bb] Re: 'Zombie-sat' and the clever orbital dance
To: amsat-bb@xxxxx.xxx
Message-ID: <5.2.1.1.2.20100525141148.00bcdbe8@xxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 02:03 PM 5/25/2010 -0400, kg4zlb@xxxxx.xxx wrote:
>The "dead-but-alive" telecommunications satellite, Galaxy-15
><http://www.orbital.com/SatellitesSpace/Communications/PanAmSat/>, has
>begun to enter the space of neighbouring craft, and their operators are
>planning evasive action.
>
>"Zombie-sat" has captured the imagination of the internet space forums
>these past few weeks. It's probably the nickname that's done it.
>
>When we sit on the sofa skipping across the smorgasbord of channels with
>our remote-controls, we don't usually give much thought to the "bent
>pipes" that sit 36,000km above our heads, delivering the televisual feast.
>
>Intelsat's Galaxy-15
><http://www.intelsat.com/resources/galaxy-15/operational-status.asp>
>satellite was put in geostationary orbit five years ago to re-distribute
>TV services to cable companies across North America, and also to send
>navigation data to aeroplanes to improve the accuracy of their GPS receivers.
>
>But the "bird" experienced a major hiccup at the beginning of April.
>
>It's not known precisely what happened. One possibility is that it was
>damaged by high-speed particles billowing off the Sun in a solar storm -
>an ever-present danger for orbiting electronics.
>
>The satellite is still operational: it's still "on", but Intelsat cannot
>control it. Any signal it receives, it re-transmits at high power. It's a
>very unusual situation.
>
>What doesn't help is the fact that Galaxy-15, which is supposed to sit at
>133 degrees West (over the eastern Pacific), is drifting slowing eastwards
>by about 0.05 degrees a day. This will take it into the path of other
>satellites, and first to have an issue is AMC-11
><http://www.ses-worldskies.com/worldskies/satellites/01_amc-fleet/amc-11/inde
x.php>,
>another TV services spacecraft operated by SES World Skies
><http://www.ses-worldskies.com/worldskies/index.php>.
>
>If SES were to do nothing, Zombie-sat would soon start picking up and
>retransmitting signals sent to AMC 11. To users on the ground who depend
>on AMC 11 for their daily dose of MTV, this could lead to a horrendous
mash-up.
>
>It would be like trying to listen to two people who are shouting the same
>conversation at you.
>
>So, SES World Skies will today begin a delicate orbital dance, in which
>they will allow AMC 11 to drift in tandem with Galaxy-15 while at the same
>time sneaking up another satellite behind the pair.
>
>The plan is for the SES controllers to then leapfrog many of the services
>on AMC-11 across to this other satellite, known as SES-1, thereby
>minimising the disruption to customers.
>
>The manoeuvres are unprecedented, says Alan Young, the chief technology
>officer with SES World Skies.
>
> "The closest AMC-11 and Galaxy-15 will come is measured in
> kilometres, and in space terms that's quite close. But the risk here
> is not one of collision; we're not at all concerned about that. The
> problem is that they're so close when viewed from Earth that it's
> not easy to distinguish between the two satellites and seeing as
> they both operate in the same frequency band, there will be
> interference if we're not careful.
>
> "We've gone to a number of measures, including moving customers on
> AMC-11 on to a very large uplink antenna. This means we can very
> finely discriminate between the two spacecraft so that we can direct
> all of the energy into AMC-11 and as little energy as possible into
> Galaxy-15. If you don't put anything into Galaxy-15, you won't get
> anything out."
>
>AMC-11 will eventually be moved back to its orbital slot to resume normal
>operations once the zombie has passed through, which should be 7 June.
>
>All satellite operators and comms companies will have to work out what
>Galaxy-15 means to them. Here at the BBC, we've had to consider how some
>of our international services like the BBC World News channel
><http://www.bbcworldnews.com> might be affected.
>
>This channel is fed through Intelsat's Galaxy-13 platform. The most recent
>calculations suggest everything should be fine.
>
>Anyone sitting on their sofa in North America should be oblivious to the
>space waltz that is about to take place.
>
>There are some wider issues, however. For satellite manufacturers, there
>will be keen interest in understanding exactly what happened to Galaxy-15.
>
>Satellites have redundant, or back-up systems
><http://news.bbc.co.uk/1/hi/sci/tech/8458203.stm>; and when they have
>major upsets, there are usually modes that will completely re-boot the
>spacecraft automatically after a period of time.
>
>Galaxy-15 was made by Orbital Sciences <http://www.orbital.com/>, but
>Patrick Wood, the chief technical officer for EADS Astrium satellites
><http://www.astrium.eads.net/>, told me the entire industry had an
>interest in finding out what went wrong:
>
> "Part of our design review process is to check through the
> architecture to ensure there isn't a single point that, were it to
> fail, we'd lose complete control of the spacecraft. Clearly
> Galaxy-15 has had a major event and most organisations will want to
> understand what happened. From an industrial point of view, the
> surprising thing is that Galaxy-15 is locked on full power. This
> tends to suggest the control/tele-command side of the spacecraft has
> failed and left the spacecraft in whatever mode it was in when it
> was last commanded. It's a very unusual case."
>
>And, of course, the whole episode raises once again the issue of orbital
>space debris <http://news.bbc.co.uk/1/hi/sci/tech/7916582.stm>. Galaxy 15
>will likely end its days in one of the two great "garbage patches" in the
sky.
>
>These libration points
><http://en.wikipedia.org/wiki/Geostationary_orbit#Earth_orbital_libration_poi
nts>,
>as they are known, are located at roughly 105 degrees West and 75 degrees
>East. They are gravitational "sweet-spots" where drifting objects will
>naturally coalesce.
>
>The two libration points now contain more than 150 defunct satellites
>[395Kb PDF]
><http://www.secureworldfoundation.org/siteadmin/images/files/file_460.pdf>.
>
>Satellite operators are urged to put their geostationary spacecraft in a
>"graveyard orbit" once their missions are complete. This usually means
>pushing the platforms even higher into the sky.
>
>But of the 21 spacecraft which reached end of life in 2009, only 11 were
>disposed of in accordance with the Inter-Agency Space Debris Coordination
>Committee's (IADC) re-orbiting guidelines [99 Kb PDF]
><http://www.iadc-online.org/Documents/Docu/IADC_Mitigation_Guidelines_Rev1_Se
p07.pdf>.
>
>
>We may all love our satellite TV, but we're starting to build a problem
>for ourselves.
>
>Watch this space.
Sometimes I wonder, as AO-40's AOP precesses over time if it won't become a
hazard to other satellites some day.
KB7ADL
------------------------------
Message: 2
Date: Tue, 25 May 2010 17:56:55 -0600
From: "Mark Spencer" <mspencer@xxxxxx.xxx>
Subject: [amsat-bb] W1AW/5 for DM73 Wednesday
To: <amsat-bb@xxxxx.xxx>, "'W1AW'" <W1AW@xxxx.xxx>
Message-ID:
<20100525235657.81CEE56CF81C@xxxxxxxxxxx.x.xxxxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
For those that tried to help with the Teachers Institute demonstration
today, thanks, but I had a battery failure and missed the pass. I will
attempt again tomorrow first during the AO27 pass at 1922Z and then again if
not successful on the 2209Z pass. I'll be using W1AW/5 from Roswell, NM
DM73. Thanks again for the support, things happen, and we'll try and
recover tomorrow.
Mark
Mark Spencer, WA8SME
Education and Technology Program Coordinator
ARRL, the national association for Amateur RadioT
mspencer@xxxx.xxx
www.arrl.org/education-technology-program
www.arrl.org/teachers-institute-on-wireless-technology
530-495-9150
------------------------------
Message: 3
Date: Tue, 25 May 2010 19:36:02 -0700
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: 'Zombie-sat' and the clever orbital dance
To: <amsat-bb@xxxxx.xxx>
Message-ID: <BLU133-W5530D5FF06480049BE90EA9E90@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
I wonder... Has anyone at SES considered just turning off their
transmitter, while Galaxy-15 crosses their path, and using it instead?
Just a thought,
Greg KO6TH
>
> If SES were to do nothing, Zombie-sat would soon start picking up and
> retransmitting signals sent to AMC 11. To users on the ground who depend
> on AMC 11 for their daily dose of MTV, this could lead to a horrendous
> mash-up.
>
_________________________________________________________________
The New Busy is not the old busy. Search, chat and e-mail from your inbox.
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en-US:WM_HMP:042010_3
------------------------------
Message: 4
Date: Tue, 25 May 2010 15:27:07 -0400
From: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>
Subject: [amsat-bb] Re: 'Zombie-sat' and the clever orbital dance
To: amsat-bb@xxxxx.xxx
Message-ID: <4BFBEC4B.4904.15804AA@xxxxxxxxxxx.xxxxxxxxx.xx>
Content-Type: text/plain; charset=US-ASCII
On 25 May 2010 at 18:44, Trevor . wrote:
Date sent: Tue, 25 May 2010 18:44:47 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] Re: 'Zombie-sat' and the clever orbital dance
To: amsat-bb@xxxxx.xxx
> The BBC are running the video on their website
>
> http://news.bbc.co.uk/1/hi/science_and_environment/10150614.stm
>
> 73 Trevor M5AKA
They will need a space fly swatter... More seriously some kind of solution
will have to be found to discard useless space debris and junk.
"-"
Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
DSTAR urcall VE2DWE
WAC BASIC CW PHONE SATELLITE
------------------------------
Message: 5
Date: Tue, 25 May 2010 17:14:41 -0400
From: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>
Subject: [amsat-bb] "sustainable satellite" Cube sat
To: amsat-bb@xxxxx.xxx
Cc: eu-amsat@xxxxxxxxxxx.xxx
Message-ID: <4BFC0581.22097.1BA8111@xxxxxxxxxxx.xxxxxxxxx.xx>
Content-Type: text/plain; charset=ISO-8859-1
A cube sat " "sustainable satellite" university project of ETS (?cole de
technologie sup?rieure) in Montreal will be presented at the
Qu?bec Provincial Hamfest in Sorel-Tracy on MAY 30 2010 www.hamfest.qc.ca
Project details are on the following web site in french an english:
http://edds.etsmtl.ca/index.php?option=com_content&view=section&layout=blog&id
=1&Itemid=1&lang=en
"-"
Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
DSTAR urcall VE2DWE
WAC BASIC CW PHONE SATELLITE
------------------------------
Message: 6
Date: Tue, 25 May 2010 23:21:00 -0700 (PDT)
From: "Patrick STODDARD \(WD9EWK/VA7EWK\)" <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] XE1/VE3OQC QRT, VE7OQC coming this fall
To: amsat-bb@xxxxx.xxx
Message-ID: <985579.37325.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Hi!
Glenn XE1/VE3OQC, who has been on the SSB satellites from
Guanajuato in Mexico over the past couple of months, asked
me to pass along a message to the AMSAT-BB regarding his
situation. Glenn is in the process of relocating from Mexico
to Vancouver, and has dismantled his satellite station. He
hopes to be settled in Vancouver this fall, when he plans to
change his call to VE7OQC and get back on the air - including
the satellites. He just mailed a bunch of QSL cards to hams
across North America, for those who have had the pleasure of
working him from his former home grid DL91.
Glenn thanks everyone who worked him on the satellites in the
recent past, and looks forward to renewing those contacts later
this year from Vancouver.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 7
Date: Wed, 26 May 2010 04:36:11 -0400
From: Dave Webb KB1PVH <kb1pvh@xxxxx.xxx>
Subject: [amsat-bb] 13 Original Colonies Special Event
To: AMSAT -BB <amsat-bb@xxxxx.xxx>, fm-satellite@xxxxxxxxxxx.xxx
Message-ID:
<AANLkTilszuI_c97ztP-zKLxoAjyPfCDfyPo5fPo4FhHd@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
It's that time of year again. Last year Tim, N3TL headed up a group of
operators from the 13 original colonies. Fortunately for him, he recently
started a new job, and will be unable to organize the satellite stations for
the 4th of July event. After emailing Ken, the organizer of the event, I was
told I could try to get another group of stations for the event to be active
on the satellites.
What I'm looking for is one operator from each of the 13 original colonies,
NY-NJ-RI-GA-PA-NH-SC-VA-CT-DE-MD-NC, I will be MA. Unlike last year, we will
have our own special event callsigns. There is no pressure to work all
passes, just do what you can and have fun. Anyone interested in doing it,
contact me off list.
http://www.13Colonies.info/
Thanks,
Dave - KB1PVH
Sent from my Verizon Wireless DROID
------------------------------
Message: 8
Date: Wed, 26 May 2010 07:42:44 -0400
From: davekn4ok@xxx.xxx
Subject: [amsat-bb] Re: 13 Original Colonies Special Event
To: amsat-bb@xxxxx.xxxx fm-satellite@xxxxxxxxxxx.xxx
Message-ID: <8CCCADFB0533237-10E0-77DF@xxxxxxxxxxxx.xxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Sounds great and a lot of fun Dave. If Texas, board of education rewrites
the 13 colonies and adds Alabama, I would be glad to help.
73's,
Dave kn4ok
-----Original Message-----
From: Dave Webb KB1PVH <kb1pvh@xxxxx.xxx>
To: AMSAT -BB <amsat-bb@xxxxx.xxx>; fm-satellite@xxxxxxxxxxx.xxx
Sent: Wed, May 26, 2010 2:36 am
Subject: [amsat-bb] 13 Original Colonies Special Event
It's that time of year again. Last year Tim, N3TL headed up a group of
perators from the 13 original colonies. Fortunately for him, he recently
tarted a new job, and will be unable to organize the satellite stations for
he 4th of July event. After emailing Ken, the organizer of the event, I was
old I could try to get another group of stations for the event to be active
n the satellites.
What I'm looking for is one operator from each of the 13 original colonies,
Y-NJ-RI-GA-PA-NH-SC-VA-CT-DE-MD-NC, I will be MA. Unlike last year, we will
ave our own special event callsigns. There is no pressure to work all
asses, just do what you can and have fun. Anyone interested in doing it,
ontact me off list.
http://www.13Colonies.info/
Thanks,
Dave - KB1PVH
Sent from my Verizon Wireless DROID
______________________________________________
ent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
ot an AMSAT-NA member? Join now to support the amateur satellite program!
ubscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 9
Date: Wed, 26 May 2010 08:54:13 -0500
From: Bruce Bostwick <lihan161051@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: 'Zombie-sat' and the clever orbital dance
To: amsat-bb@xxxxx.xxx
Message-ID: <DCD12DD5-D3C7-418A-A808-DF451EB478F4@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
On May 25, 2010, at 2:27 PM, Luc Leblanc wrote:
>> The BBC are running the video on their website
>>
>> http://news.bbc.co.uk/1/hi/science_and_environment/10150614.stm
>>
>> 73 Trevor M5AKA
>
>
> They will need a space fly swatter... More seriously some kind of
> solution will have to be found to discard useless space debris and
> junk.
It's all in the delta-V. If you can apply enough to put the perigee
in the upper atmosphere, the orbit will eventually decay to where the
object deorbits. Everything in LEO encounters enough drag to end up
in the atmosphere sooner or later, whether it's within a year, within
ten years, or within a hundred years, sooner or later it will fall
out. HEO and above, you pretty much have to apply external delta-V to
get the perigee down far enough.
The problem with dead HEO and GEO sats, and a lot of the GTO booster
stages that got them there, and all the loose bits of shrouds,
interstage thrust structures, and so on, is that their perigees are
far enough above the atmosphere that if left completely alone, they'll
still be there tends of thousands of years from now, because there
just aren't any forces acting on them that are strong enough to either
deorbit them or kick them up to escape velocity and out into solar
orbit, and the immediate problem with *that* is that at $36k-$550k/
kilogram, it's still too expensive to launch much more than new
working sats to GEO.
If the cost comes down to where it's practical to launch a semi-
autonomous deorbiting "tug" of some sort to grapple junk and push it
to a low enough perigee, with some kind of propulsion that can supply
large amounts of delta-V for a relatively small onboard fuel load,
then a lot can be done about HEO/GEO junk. But all of those are big
ifs, and doing anything like that with our current propulsion tech
just isn't feasible due to diminishing returns. You're pretty much
looking at some kind of antimatter rocket to be able to do that kind
of job.
"A process cannot be understood by stopping it. Understanding must
move with the flow of the process, must join it and flow with it." --
the First Law of Mentat
------------------------------
Message: 10
Date: Wed, 26 May 2010 09:35:54 -0400
From: "Bill Jones" <wejones@xxxxxxxxxx.xxx>
Subject: [amsat-bb] Re: 'Zombie-sat' and the clever orbital dance
To: <amsat-bb@xxxxx.xxx>
Message-ID: <4BFCEB7A.24678.B54D25@xxxxxxxxx>
Content-Type: text/plain; charset=US-ASCII
On 25 May 2010 at 19:36, Greg D. wrote:
>
> I wonder... Has anyone at SES considered just turning off their
transmitter,
> while Galaxy-15 crosses their path, and using it instead?
>
G-15 and AMC-11 are opposite polarity, and most of the AMC-11 transponders are
pretty wide, and the main carrier freq of each transponder is right at the
null
between the transponders on G-15. It should work on narrow signals that don't
have carriers at the nulls, but I don't think it would work for most of the
wide
transponders.
------------------------------
Message: 11
Date: Wed, 26 May 2010 18:04:37 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] AKATSUKI and IKAROS received in Bochum
To: amsat-bb@xxxxx.xxx
Message-ID: <16478.95697.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
AKATSUKI and IKAROS received in Bochum
http://tinyurl.com/BochumUnitec-1
AKATSUKI and IKAROS received in England by Paul M0EYT
http://www.uhf-satcom.com/amateurdsn/planetc/
73 Trevor M5AKA
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 5, Issue 238
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