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CX2SA > SATDIG 30.09.11 21:07l 446 Lines 13909 Bytes #999 (0) @ WW
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Today's Topics:
1. AMSAT-UK - Fall OSCAR News (Trevor .)
2. calculation of eclipse (normn3ykf@xxxx.xx.xxxx
3. Re: calculation of eclipse (Ken Ernandes)
4. Engineering and Philosophy (Trevor .)
5. Re: calculation of eclipse (normn3ykf@xxxx.xx.xxxx
6. Re: calculation of eclipse (normn3ykf@xxxx.xx.xxxx
7. Re: calculation of eclipse (Clive Wallis)
8. Re: calculation of eclipse (Clive Wallis)
9. Re: calculation of eclipse (Simon HB9DRV)
10. AMSAT-UK Member survey. (Rob Styles)
11. Yet ANOTHER Satellite's Re-entry (Clint Bradford)
12. FO-29 problems ? (Ib Christoffersen)
13. 2011 Symposium (Martha)
----------------------------------------------------------------------
Message: 1
Date: Fri, 30 Sep 2011 00:26:33 +0100 (BST)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] AMSAT-UK - Fall OSCAR News
Message-ID:
<1317338793.87736.YahooMailClassic@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
AMSAT-UK - Fall OSCAR News
The Fall edition of the color A4 newsletter OSCAR News is being posted to
AMSAT-UK members this week
As usual it's packed with Amateur Satellite articles:
- Haven't Got A Callsign - regular column by Clive Wallis G3CWV
- Memories of working Astronaut Helen Sharman GB1MIR by Chris Lorek G4HCL
- Louis Varney Cup Presentation to Paul Robinson 2E1EUB
- ARISSat-1 Reception
- USA NTIA WRC proposal for an ITU "Educational" Satellite Service
- ARISSat Update
- FUNcube Testing at RAL
- Syncart geostationary transponder
- Report on First UK National Space Conference 2011
- FUNcube Project Report
- KiwiSAT Current Status
- IARU Region 1 Sun City Report
- 2011 Colloquium Report
- QB50 Latest News
To receive this copy of OSCAR News join AMSAT-UK online at
http://tinyurl.com/JoinAMSAT-UK/
If you've never seen OSCAR News before you can get an idea of what it's like
by downloading a sample issue from
http://www.uk.amsat.org/on_193_final.pdf
AMSAT-UK
http://www.uk.amsat.org/
----
73 Trevor M5AKA
------------------------------
Message: 2
Date: Thu, 29 Sep 2011 23:33:07 +0000
From: <normn3ykf@xxxx.xx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] calculation of eclipse
Message-ID: <20110929233307.PTODV.90732.root@xxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8
Hi all!!
How does one calculate the period and time of entry and exit of eclipse?
I'm going to be helping a friend do an Arissat presentation for her class.
Due to the fact of the battery failing, this gives a 15 minute hold before
the power management allows transmission. So, for any chance of receiving
the bird, it has to be in sunlight for 15 minutes (or so).
I'd prefer a mathematical formula. Echo goes through some of the same trials.
Thanks,
Norm
BTW: I am an engineering student, just throw the math my way.
------------------------------
Message: 3
Date: Thu, 29 Sep 2011 20:18:28 -0400
From: Ken Ernandes <n2wwd@xxxxxxxxxx.xxx>
To: "<normn3ykf@xxxx.xx.xxx>" <normn3ykf@xxxx.xx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: calculation of eclipse
Message-ID: <5B3554C8-F5C5-4827-B7EC-A4BEB27F0C09@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Unfortunately it's not a simple formula, but rather a process. To compute,
you need to not only propagate the satellite orbit (as is done in a tracking
program), but also need an algorithm to generate positions of the Sun
relative to the Earth. (The latter is available in a book called
"Astronomical Algorithms" by Jean Meeus.) You will also need to consider
the diameter of both the Sun and the Earth.
The eclipse geometry is explained in the book "Satellite Orbits" by
Montenbruck and Gill. From there you need to develop a sampling method to
determine entry and exit times.
Bear in mind that the eclipse geometry and timing is different on a
case-by-case basis with the exception of some specialized orbits (which
ARISSsat is not in).
I'm sorry I couldn't offer a more satisfying answer.
73, Ken N2WWD
Sent from my iPad
On Sep 29, 2011, at 7:33 PM, <normn3ykf@xxxx.xx.xxx> wrote:
> Hi all!!
> How does one calculate the period and time of entry and exit of eclipse?
> I'm going to be helping a friend do an Arissat presentation for her class.
Due to the fact of the battery failing, this gives a 15 minute hold before
the power management allows transmission. So, for any chance of receiving
the bird, it has to be in sunlight for 15 minutes (or so).
> I'd prefer a mathematical formula. Echo goes through some of the same
trials.
> Thanks,
> Norm
> BTW: I am an engineering student, just throw the math my way.
>
>
> _______________________________________________
> 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: 4
Date: Fri, 30 Sep 2011 01:35:55 +0100 (BST)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Engineering and Philosophy
Message-ID:
<1317342955.60078.YahooMailClassic@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
A promotional video with a Cubesat towards the end
Nick Ridley '11: Exploring the Intersection of Engineering and Philosophy
http://www.youtube.com/watch?v=anEHxQrpans
73 Trevor M5AKA
------------------------------
Message: 5
Date: Fri, 30 Sep 2011 1:25:03 +0000
From: <normn3ykf@xxxx.xx.xxx>
To: Ken Ernandes <n2wwd@xxxxxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: calculation of eclipse
Message-ID: <20110930012503.XCLFS.105626.root@xxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8
Ken,
Thanks for the pointers to texts. Meeus's tome has good reviews. I may try
to find an older copy of his book that deals with programming calculators.
Simpler for me to program.
This sounds like a fun project.
Seems to me once the heavy lifting is done (algorithm), calculation of
eclipse times could be automated. I have a feeling that I'll eat those words.
Norm
------------------------------
Message: 6
Date: Thu, 29 Sep 2011 21:25:22 -0400
From: <normn3ykf@xxxx.xx.xxx>
To: Ken Ernandes <n2wwd@xxxxxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: calculation of eclipse
Message-ID: <20110930012522.1P1T8.105629.root@xxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8
Ken,
Thanks for the pointers to texts. Meeus's tome has good reviews. I may try
to find an older copy of his book that deals with programming calculators.
Simpler for me to program.
This sounds like a fun project.
Seems to me once the heavy lifting is done (algorithm), calculation of
eclipse times could be automated. I have a feeling that I'll eat those words.
Norm
------------------------------
Message: 7
Date: Fri, 30 Sep 2011 08:51:45 +0100
From: Clive Wallis <list1@xxxxx.xx.xx>
To: normn3ykf@xxxx.xx.xxxx amsat <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: calculation of eclipse
Message-ID: <4E857511.8070207@xxxxx.xx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Norm,
I did this many years ago for OSCAR-11, and published an outline of the
procedure in OSCAR News.
The calculations were based on procedures written by James Miller G3RUH.
There is a package of files which includes the software, documentation
and original G3RUH articles. It's a long time ago since I did this, but
IIRC there is a spread sheet graph which compares the eclipse prediction
with the solar array currents.
HTH
73 Clive G3CWV
Hitchin, North hertfordshire, UK
On 30/09/2011 00:33, normn3ykf@xxxx.xx.xxx wrote:
> Hi all!!
> How does one calculate the period and time of entry and exit of eclipse?
> I'm going to be helping a friend do an Arissat presentation for her class.
Due to the fact of the battery failing, this gives a 15 minute hold before
the power management allows transmission. So, for any chance of receiving
the bird, it has to be in sunlight for 15 minutes (or so).
> I'd prefer a mathematical formula. Echo goes through some of the same
trials.
> Thanks,
> Norm
> BTW: I am an engineering student, just throw the math my way.
>
>
> _______________________________________________
> 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: 8
Date: Fri, 30 Sep 2011 10:04:52 +0100
From: Clive Wallis <list1@xxxxx.xx.xx>
To: amsat <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: calculation of eclipse
Message-ID: <4E858634.80906@xxxxx.xx.xx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Ooops! I forgot to say that the file is satill.zip on my website
www.g3vwv.co.uk
It's on the OSCAR-11 page and the general satellite page.
73 Clive G3CWV
On 30/09/2011 08:51, Clive Wallis wrote:
> Hi Norm,
>
> I did this many years ago for OSCAR-11, and published an outline of the
> procedure in OSCAR News.
>
> The calculations were based on procedures written by James Miller G3RUH.
>
> There is a package of files which includes the software, documentation
> and original G3RUH articles. It's a long time ago since I did this, but
> IIRC there is a spread sheet graph which compares the eclipse prediction
> with the solar array currents.
>
> HTH
>
> 73 Clive G3CWV
>
> Hitchin, North hertfordshire, UK
> On 30/09/2011 00:33, normn3ykf@xxxx.xx.xxx wrote:
>> Hi all!!
>> How does one calculate the period and time of entry and exit of eclipse?
>> I'm going to be helping a friend do an Arissat presentation for her
>> class. Due to the fact of the battery failing, this gives a 15 minute
>> hold before the power management allows transmission. So, for any
>> chance of receiving the bird, it has to be in sunlight for 15 minutes
>> (or so).
>> I'd prefer a mathematical formula. Echo goes through some of the same
>> trials.
>> Thanks,
>> Norm
>> BTW: I am an engineering student, just throw the math my way.
>>
------------------------------
Message: 9
Date: Fri, 30 Sep 2011 11:32:05 +0200
From: "Simon HB9DRV" <simon@xxxxxx.xx>
To: "'amsat'" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: calculation of eclipse
Message-ID: <014d01cc7f53$d1b27b50$751771f0$@xx>
Content-Type: text/plain; charset="us-ascii"
Clive,
Your website is: http://www.g3cwv.co.uk/ :)
Simon Brown, HB9DRV
http://sdr-radio.com
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Clive Wallis
Ooops! I forgot to say that the file is satill.zip on my website
www.g3vwv.co.uk
------------------------------
Message: 10
Date: Fri, 30 Sep 2011 10:50:19 +0100
From: Rob Styles <robpegs@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] AMSAT-UK Member survey.
Message-ID: <BLU0-SMTP22032DB9DA23B178F1D5505B1F70@xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
We invite you as members of AMSAT-UK to our online Survey,We always strive
to improve your membership, and we would like your views and comments.
Please take a few minutes to complete our online survey at
http://amsat-uk.limeask.com/
Rob M0TFO
AMSAT-UK
------------------------------
Message: 11
Date: Fri, 30 Sep 2011 03:15:58 -0700
From: Clint Bradford <clintbradford@xxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Yet ANOTHER Satellite's Re-entry
Message-ID: <99DD83CA-0E61-458F-B5CD-8121290AEE0E@xxx.xxx>
Content-Type: text/plain; charset=windows-1252
The defunct German Roentgen Satellite (ROSAT) is coming back to planet Earth
- sometime in late October or early November. The X-ray space observatory is
less than half the weight (2.4-tons) of the fallen UARS, but has an orbit
that ranges from latitudes of 53 degrees north and south, putting it in a
position where it can threaten a wide region that stretches from Canada to
South America. And while much of the spacecraft will disintegrate during
it?s rapid descent, German Aerospace Agency officials predict that as many
as 30 large chunks of debris ? a combined mass of 1.6 tons ? is expected to
survive re-entry.
http://science.nasa.gov/missions/rosat/
Clint Bradford, K6LCS
------------------------------
Message: 12
Date: Fri, 30 Sep 2011 13:12:08 +0200
From: "Ib Christoffersen" <oz1my@xxxxxx.xx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] FO-29 problems ?
Message-ID: <01.A1.00855.A04A58E4@xxxxx.xxxx.xx>
Content-Type: text/plain; charset="us-ascii"
Hi all,
I just tried to listen to FO-29. It was a pass with AOS here in Copenhagen
at 1057 UTC.
Nothing heard !
Reports on the report page indicate the same.
See: http://oscar.dcarr.org/
Any news from Japan ?
73 OZ1MY
Ib
------------------------------
Message: 13
Date: Fri, 30 Sep 2011 13:28:07 -0400
From: Martha <martha@xxxxx.xxx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>, Lee McLAMB <KU4OS@xxxxx.xxx>
Subject: [amsat-bb] 2011 Symposium
Message-ID:
<CAPk0USxse-Pi9nASsuEegK5q2x5+FgA=WErnfmT76F1Mk+p=WQ@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
People - *Time is running out to make hotel reservations for the 2011 AMSAT
Space Symposium and Annual Meeting. * The cut off date is *October 10th* (I
am trying to change that). Please don't wait! The hotel is the Wyndham San
Jose and the phone number is 408-453-6200. The reservation block is under
the name* AMSAT . *
--
73- Martha
------------------------------
_______________________________________________
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 543
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