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CX2SA > SATDIG 16.11.11 22:06l 523 Lines 16989 Bytes #999 (0) @ WW
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Subj: AMSAT-BB-digest V6 629
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Sent: 111116/2003Z @:CX2SA.LAV.URY.SA #:38710 [Minas] FBB7.00e $:AMSATBB6629
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. 5 in EM55 (wa4hfn@xxxxxxx.xxxx
2. p/ from Dm67 (Jim Adams)
3. Status on re-activating Prospero (Frank Woolfe)
4. AO-51 Pass@xxxxx UTC (Kevin Deane)
5. Re: ARISSat-1 (37772) decay (Mineo Wakita)
6. Re: AO-51 Pass@xxxxx UTC (Don Snider)
7. 5 in EM55 (wa4hfn@xxxxxxx.xxxx
8. NASA Twitting Mars Rover Launch (Clint Bradford)
9. Re: ARISSat-1 (37772) decay (John Heath)
10. Re: ARISSat-1 (37772) decay (Fabio Azzarello)
----------------------------------------------------------------------
Message: 1
Date: Tue, 15 Nov 2011 23:49:52 +0000 (UTC)
From: wa4hfn@xxxxxxx.xxx
To: AMSAT <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] 5 in EM55
Message-ID:
<1163758802.1974200.1321400992006.JavaMail.root@xxxxxxx.xxxxxxxxxxx.xx.xxxx.xx
xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Congrats to Leo W7JPI award #41 5 in EM55
WA4HFN Damon em55
for info on this award look me up on qrz.com
------------------------------
Message: 2
Date: Tue, 15 Nov 2011 19:02:19 -0700
From: Jim Adams <jim9251@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] p/ from Dm67
Message-ID:
<CAD6RR8iO5Zj_b6NtpWROgefXd+hgNm2N=5YdEHdhGGwH9J4jJA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Had 24 qso's from DM67 today, Ouray County Colorado about 12,000 feet. It
was sunny and a balmy 18 degrees. One of the AO-27 passes was so low I was
pointing the Arrow antenna straight down to the ground.
QSO's with: AC0RA; N8RO; CO6CBF; XE1AO; W5PFG; KF7MYK; AJ5C; K7TEJ; KG7EZ;
K4MOA; KB1RVT;
WA3SWJ; NS7Q; KA6SIP; W0DHB; W0PTI; KL7XK; AND AC2GK/VE5.
As always, if you need a QSL card for DM67, send me an email and I'll get
you one in the mail. SASE not necessary. LoTW logs uploaded showing the
correct grid.
Jim Adams - K0BAM
Delta Colorado Dm68
------------------------------
Message: 3
Date: Wed, 16 Nov 2011 20:10:27 +1030
From: "Frank Woolfe" <frankwoolfe@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Status on re-activating Prospero
Message-ID: <4B17D92B41B54AAA97F40119AD843BF2@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
As a WOOMERA Vet that was on site for 13 years and been witness and
supported in one way or another many Rocket Launches, I am also interested
on the PROSPERO situation..
Regards,
Frank H Woolfe; Dip EE,VK5KV.
Radio Officer Coast Guard Port Augusta
7 Leahy Street Port Augusta, SA 5700
Ph; Hm (618) 8641 2883
Mb; 0407 873 411
Email; frankwoolfe@xxxxxxx.xxx
------------------------------
Message: 4
Date: Wed, 16 Nov 2011 02:45:57 -0800
From: Kevin Deane <summit496@xxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] AO-51 Pass@xxxxx UTC
Message-ID: <COL107-W348FBD30B4C93B953BDCAC83C60@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
I swear I just heard some strange talking on the bird and something that
sounded like a submarine pinging underwater. I thought I had Hunt for Red
October on the boob tube or somethin. I heard myself on the downlink clear
as day, really strong signal. I double checked my freqs and well there is no
mistaking hearing yourself talk on the downlink of a satellite.
Usually somebody is on these passes, but I got no response from several
calls. Anyone ever experience anything like this? No I was not drinking or
on anything.
Kevin
KF7MYK
------------------------------
Message: 5
Date: Wed, 16 Nov 2011 20:36:44 +0900
From: "Mineo Wakita" <ei7m-wkt@xxxxxxxxx.xx.xx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: ARISSat-1 (37772) decay
Message-ID: <7ADC33A3BEAA4D50915D226B01E08E9E@xxxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-2022-jp";
reply-type=original
Hello Jim, N8OQ.
Thanks for your very valuable reply.
Because it has the effect of the atmosphere density, I think that
the re-entry into the earth's atmosphere of ARISSat-1 becomes
really earlier than April 9, 2011.
I added your this reply under the following my URL,
http://www.ne.jp/asahi/hamradio/je9pel/arissat5.htm
Thank you.
JE9PEL, Mineo Wakita
------------------------------
Message: 6
Date: Wed, 16 Nov 2011 09:14:15 -0500
From: "Don Snider" <dsnider@xxxx.xxx>
To: "'Kevin Deane'" <summit496@xxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-51 Pass@xxxxx UTC
Message-ID: <00bb01cca46a$08ed9ba0$1ac8d2e0$@xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Nothing like that but I did get wiped out on an AO-51 pass by strange up and
down oscillations on receive. I couldn't hear a thing over it. I later found
out it was an AWAC plane flying down the coast.... Really weird. 73, Don
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Kevin Deane
Sent: Wednesday, November 16, 2011 5:46 AM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] AO-51 Pass@xxxxx UTC
I swear I just heard some strange talking on the bird and something that
sounded like a submarine pinging underwater. I thought I had Hunt for Red
October on the boob tube or somethin. I heard myself on the downlink clear
as day, really strong signal. I double checked my freqs and well there is no
mistaking hearing yourself talk on the downlink of a satellite.
Usually somebody is on these passes, but I got no response from several
calls. Anyone ever experience anything like this? No I was not drinking or
on anything.
Kevin
KF7MYK
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. 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
------------------------------
Message: 7
Date: Wed, 16 Nov 2011 14:23:20 +0000 (UTC)
From: wa4hfn@xxxxxxx.xxx
To: AMSAT <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] 5 in EM55
Message-ID:
<664836388.8545.1321453400433.JavaMail.root@xxxxxxx.xxxxxxxxxxx.xx.xxxx.xxxxxx
x.xxx>
Content-Type: text/plain; charset=utf-8
Congrats to Tom KA6SIP for award #42 5 in em55
WA4HFN Damon
For info about this award look me up on qrz.com
------------------------------
Message: 8
Date: Wed, 16 Nov 2011 08:12:50 -0800
From: Clint Bradford <clintbradford@xxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] NASA Twitting Mars Rover Launch
Message-ID: <E71DF485-10C3-42F4-BB99-A327A8F7B610@xxx.xxx>
Content-Type: text/plain; CHARSET=US-ASCII
RELEASE: 11-387
NASA INVITES 150 LUCKY TWITTER FOLLOWERS TO LAUNCH OF MARS ROVER
WASHINGTON -- NASA has invited 150 followers of the agency's Twitter
account to a two-day launch Tweetup on Nov. 23 and 25 at the agency's
Kennedy Space Center in Florida.
The Tweetup is expected to culminate in the launch of the Mars Science
Laboratory's Curiosity rover aboard an Atlas V rocket from nearby
Cape Canaveral Air Force Station.
The launch window is scheduled to open at 10:25 a.m. EST on Nov. 25.
Curiosity's arrival at Mars is anticipated in August 2012 near Gale
Crater. During the nearly two-year prime mission, the rover will
investigate whether a selected area of Mars offered environmental
conditions favorable for microbial life and preserved that evidence,
if it existed.
Tweetup participants were selected from more than 1,050 people who
registered online. They will share their Tweetup experiences with
their followers through the social networking site Twitter.
Participants represent the United States, Australia, Belgium, Brazil,
Canada, France, Germany, Ireland, Spain and the United Kingdom.
Attendees from the U.S. come from the District of Columbia and 37
states: Alabama, Arizona, California, Connecticut, Florida, Georgia,
Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana,
Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi,
Missouri, Nebraska, New Hampshire, New Jersey, New Mexico, New York,
North Carolina, Ohio, Oregon, Pennsylvania, South Carolina,
Tennessee, Texas, Utah, Virginia, Washington and Wisconsin.
Beginning at 11 a.m. on Wednesday, Nov. 23, NASA will broadcast a
portion of the Tweetup when attendees talk with Jim Green, Planetary
Science division director, and Doug McCuistion, Mars Exploration
program director, both at NASA Headquarters in Washington. Engineers
from NASA's Jet Propulsion Laboratory, Pasadena, Calif., where the
rover was designed and built will speak, as will mission scientists.
To watch the broadcast, visit:
http://www.ustream.tv/channel/nasa-tweetup
Participants also will tour Kennedy and Cape Canaveral, including a
close-up visit to the launch pad. On launch day, they will speak with
NASA Administrator Charles Bolden; Leland Melvin, NASA's assistant
administrator for education; astronaut Doug Wheelock and Bill Nye the
Science Guy.
Reporters credentialed to cover the launch also may cover the NASA
Tweetup at Kennedy's press site. Reporters interested in interviewing
Tweetup attendees in advance should contact Stephanie Schierholz at
202-358-1100 or stephanie.schierholz@xxxx.xxx.
NASA has invited its Twitter followers to attend eight previous
launches: NASA's newest Earth-observing satellite, NPP; the twin
GRAIL spacecraft bound for the moon; the Juno spacecraft on its way
to Jupiter; and five space shuttle missions.
To follow participants on Twitter as they experience the prelaunch
events and Curiosity's liftoff, follow the #NASATweetup hashtag and
the list of attendees at:
https://twitter.com/NASATweetup/mars-curiosity
JPL manages the mission. NASA's Launch Services Program at Kennedy is
managing the launch.
For more information about the Mars Curiosity rover, visit:
http://www.nasa.gov/msl
Interact with the mission via Twitter and Facebook accounts at:
http://Twitter.com/MarsCuriosity
http://Facebook.com/MarsCuriosity
To connect with NASA on Twitter and other social networking sites,
visit:
http://www.nasa.gov/connect
-end-
Clint Bradford
clintbradford@xxx.xxx
------------------------------
Message: 9
Date: Wed, 16 Nov 2011 18:19:26 +0000 (GMT)
From: John Heath <g7hia@xxxxxxxxxx.xxx>
To: DeYoung James <deyoung_james@xxxxx.xxx>
Cc: Amsat <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: ARISSat-1 (37772) decay
Message-ID: <1321467566.64203.YahooMailRC@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
Hi Jim,
Thanks for the update on your AMSAT Journal article.
There are several people on the bb who are following? this topic and are busy
plotting data.
Any futher thoughts you have,?as we move towards January would, I am sure be
of
interest.
73 John G7HIA
________________________________
From: DeYoung James <deyoung_james@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Sent: Tuesday, 15 November, 2011 17:29:31
Subject: [amsat-bb] ARISSat-1 (37772) decay
Greetings,
?
First, thank you Mineo for reading the AMSAT Journal and making several of my
papers available
on?your web site.
My AMSAT Journal
paper published in the March/April 2011 issue is actually still fairly valid
for the scenarios shown in the paper. The solar flux has turned out to be
somewhat higher than was used/predicted in the paper. This has caused the
atmospheric densities to be higher which results in higher decay rates. When I
wrote the paper I had this nagging feeling that stopping the
release height
scenarios at 370-km was not going to be high enough. We are very fortunate
that
the ISS was boosted to such a height before release of ARISSat-1 and not after
release!
?
There is a
valuable lesson, I think, to be made with respect to predicting satellite
decay
dates far into the future. The future state of the atmosphere, i.e. the
atmospheric density that the satellite will pass through is poorly predictable
in the long-term, say starting greater than a week or two into the future.
Predictions of?satellite decay?dates months in the future should be
evaluated with the understanding that your date of prediction errors may be
large. The errors
are due to the future uncertainties of the orbital path which
grow quickly with time in a prediction. The atmospheric density is not the
only
source of error. Your orbit model, the integrator, and the accounting of the
gravitational and
drag forces among others will affect your results.
Predictions of
satellite decay dates are not do-and-forget. The general process is to make a
prediction, get new measured observations of the height in the future, and at
some point re-do your prediction when the errors become significant to you.
With that all
said here is my current prediction using the same tools used in the AMSAT J.
paper and produced as of 2011 November 13th. The decay of ARISSat-1 (37772)
will happen nominally on 2012 January 30th with a 10% rule-of-thumb error
allowance of 18 days around this date. The
errors may be larger than the rule-of-thumb indicates!
Jim, N8OQ
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. 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
------------------------------
Message: 10
Date: Wed, 16 Nov 2011 20:28:47 +0100
From: Fabio Azzarello <iw8qku@xxxxx.xxx>
To: AMSAT-BB@xxxxx.xxx
Cc: Antonino Modafferi <antomod@xxxxx.xxx>, conso m
<foragabbu@xxxxx.xxx>
Subject: [amsat-bb] Re: ARISSat-1 (37772) decay
Message-ID:
<CAG-zPHOt5vB+jGUWePhsMq=gdmCkEuKpJ-rkJrfpdZ0-90_STw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hello Everybody,
I totally agree with you James... the process is a continuous evolution.
I did my prediction on October 6th for the "Chicken Little Competition" and
my date was January 23rd 2012.
It surprisingly agrees with your prediction done almost one month later,
this make me think that my assumptions were right, up to now at least.
73s
Fabio
IW8QKU/5
Hi Jim,
Thanks for the update on your AMSAT Journal article.
There are several people on the bb who are following this topic and are
busy
plotting data.
Any futher thoughts you have, as we move towards January would, I am sure
be of
interest.
73 John G7HIA
________________________________
From: DeYoung James <deyoung_james@xxxxx.xxx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Sent: Tuesday, 15 November, 2011 17:29:31
Subject: [amsat-bb] ARISSat-1 (37772) decay
Greetings,
First, thank you Mineo for reading the AMSAT Journal and making several of
my
papers available
on your web site.
My AMSAT Journal
paper published in the March/April 2011 issue is actually still fairly valid
for the scenarios shown in the paper. The solar flux has turned out to be
somewhat higher than was used/predicted in the paper. This has caused the
atmospheric densities to be higher which results in higher decay rates.
When I
wrote the paper I had this nagging feeling that stopping the
release height
scenarios at 370-km was not going to be high enough. We are very fortunate
that
the ISS was boosted to such a height before release of ARISSat-1 and not
after
release!
There is a
valuable lesson, I think, to be made with respect to predicting satellite
decay
dates far into the future. The future state of the atmosphere, i.e. the
atmospheric density that the satellite will pass through is poorly
predictable
in the long-term, say starting greater than a week or two into the future.
Predictions of satellite decay dates months in the future should be
evaluated with the understanding that your date of prediction errors may be
large. The errors
are due to the future uncertainties of the orbital path which
grow quickly with time in a prediction. The atmospheric density is not the
only
source of error. Your orbit model, the integrator, and the accounting of
the
gravitational and
drag forces among others will affect your results.
Predictions of
satellite decay dates are not do-and-forget. The general process is to make
a
prediction, get new measured observations of the height in the future, and
at
some point re-do your prediction when the errors become significant to you.
With that all
said here is my current prediction using the same tools used in the AMSAT J.
paper and produced as of 2011 November 13th. The decay of ARISSat-1 (37772)
will happen nominally on 2012 January 30th with a 10% rule-of-thumb error
allowance of 18 days around this date. The
errors may be larger than the rule-of-thumb indicates!
Jim, N8OQ
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. 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@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 6, Issue 629
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