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thomsona@flash.net Guest
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Posted: Fri Jun 15, 2007 12:58 am Post subject: Re: Inclination angles for LEO satellites |
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On Jun 14, 8:55 am, Dave Michelson <d...@ece.ubc.ca> wrote:
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C. Pardini and L. Anselmo, "Assessing the Risk of Orbital Debris
Impact," Space Debris. Dordrecht: 1999. Vol. 1, Iss. 1; p. 59-80.
There's no evidence of a spike in equatorial LEO as seen in the figure
on page 5 of Carroll.
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That might be an artifact of the time the article was written and the
fact that US coverage of low-inclination LEO orbits hasn't been, at
least historically speaking, all that good. |
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David M. Palmer Guest
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Posted: Fri Jun 15, 2007 6:42 am Post subject: Re: Inclination angles for LEO satellites |
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In article <46dc2111.970053393@news.giganews.com>, Rand Simberg
<simberg.interglobal@org.trash> wrote:
| Quote: |
On Wed, 13 Jun 2007 16:44:06 GMT, in a place far, far away, Dave
Michelson <davem@ece.ubc.ca> made the phosphor on my monitor glow in
such a way as to indicate that:
Allen Thomson wrote:
On Jun 11, 2:00 pm, Dave Michelson <d...@ece.ubc.ca> wrote:
What I need now is a similar result for inclination angles.
Would p.5 of http://www.spaceelevator.com/docs/800Carroll.pdf help?
Thanks, that's very helpful!
I presume 'other' is mostly ESA. If so, I had no idea they had put up
so many satellites into near equatorial LEO.
Well, they're the only ones who can (except Sea Launch). Not sure
that's a good enough reason to do it, though. I wonder why? It
doesn't seem like a very useful orbit.
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If you want to put the most stuff in orbit from an equatorial launch
site, such as French Guyana, an equatorial orbit is optimum.
And there are reasons why equatorial orbits are better for some things.
a) It passes over your ground station more often and for longer each
time, assuming your ground station is equatorial
b) It never passes through the South Atlantic Anomaly high-radiation
zone.
These are sufficiently important for some missions that the gamma ray
burst astronomical satellite mission HETE was launched into an
equatorial orbit by a Pegasus XL (air launched, so you don't need a
fixed launch pad).
For the later GRB mission Swift, we bought an extra solid rocket motor
to strap to the Delta in order to bring the (Cape Kennedy-launched)
orbital inclination from 28 degrees down to 23.
--
David M. Palmer dmpalmer@email.com (formerly @clark.net, @ematic.com) |
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th Guest
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Posted: Fri Jun 15, 2007 8:25 pm Post subject: Re: Inclination angles for LEO satellites |
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Dave Michelson wrote:
| Quote: |
Allen Thomson wrote:
On Jun 11, 2:00 pm, Dave Michelson <d...@ece.ubc.ca> wrote:
What I need now is a similar result for inclination angles.
Would p.5 of http://www.spaceelevator.com/docs/800Carroll.pdf help?
Thanks, that's very helpful!
I presume 'other' is mostly ESA. If so, I had no idea they had put up
so many satellites into near equatorial LEO.
ESA has not launched to equatorial LEO, most ESA LEO are polar. Couldn't |
this be remainders of telecom GTO launches?
--
th |
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Rand Simberg Guest
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Posted: Fri Jun 15, 2007 8:41 pm Post subject: Re: Inclination angles for LEO satellites |
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On Fri, 15 Jun 2007 16:25:07 GMT, in a place far, far away, th
<someguy@somewhere.se> made the phosphor on my monitor glow in such a
way as to indicate that:
| Quote: |
Dave Michelson wrote:
Allen Thomson wrote:
On Jun 11, 2:00 pm, Dave Michelson <d...@ece.ubc.ca> wrote:
What I need now is a similar result for inclination angles.
Would p.5 of http://www.spaceelevator.com/docs/800Carroll.pdf help?
Thanks, that's very helpful!
I presume 'other' is mostly ESA. If so, I had no idea they had put up
so many satellites into near equatorial LEO.
ESA has not launched to equatorial LEO, most ESA LEO are polar. Couldn't
this be remainders of telecom GTO launches?
|
Could be, though those would presumably be in GTO, rather than LEO.
Are they circular LEO, or do they have a high apogee? |
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th Guest
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Posted: Fri Jun 15, 2007 11:01 pm Post subject: Re: Inclination angles for LEO satellites |
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Rand Simberg wrote:
| Quote: |
On Fri, 15 Jun 2007 16:25:07 GMT, in a place far, far away, th
someguy@somewhere.se> made the phosphor on my monitor glow in such a
way as to indicate that:
Dave Michelson wrote:
Allen Thomson wrote:
On Jun 11, 2:00 pm, Dave Michelson <d...@ece.ubc.ca> wrote:
What I need now is a similar result for inclination angles.
Would p.5 of http://www.spaceelevator.com/docs/800Carroll.pdf help?
Thanks, that's very helpful!
I presume 'other' is mostly ESA. If so, I had no idea they had put up
so many satellites into near equatorial LEO.
ESA has not launched to equatorial LEO, most ESA LEO are polar. Couldn't
this be remainders of telecom GTO launches?
Could be, though those would presumably be in GTO, rather than LEO.
Are they circular LEO, or do they have a high apogee?
|
GEO launcher stages normally remain in GTO but this orbit frequently
visits the low altitudes and might be included in the statistics.
--
th |
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Rand Simberg Guest
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Posted: Fri Jun 15, 2007 11:15 pm Post subject: Re: Inclination angles for LEO satellites |
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On Fri, 15 Jun 2007 19:01:37 GMT, in a place far, far away, th
<someguy@somewhere.se> made the phosphor on my monitor glow in such a
way as to indicate that:
| Quote: |
Rand Simberg wrote:
On Fri, 15 Jun 2007 16:25:07 GMT, in a place far, far away, th
someguy@somewhere.se> made the phosphor on my monitor glow in such a
way as to indicate that:
Dave Michelson wrote:
Allen Thomson wrote:
On Jun 11, 2:00 pm, Dave Michelson <d...@ece.ubc.ca> wrote:
What I need now is a similar result for inclination angles.
Would p.5 of http://www.spaceelevator.com/docs/800Carroll.pdf help?
Thanks, that's very helpful!
I presume 'other' is mostly ESA. If so, I had no idea they had put up
so many satellites into near equatorial LEO.
ESA has not launched to equatorial LEO, most ESA LEO are polar. Couldn't
this be remainders of telecom GTO launches?
Could be, though those would presumably be in GTO, rather than LEO.
Are they circular LEO, or do they have a high apogee?
GEO launcher stages normally remain in GTO but this orbit frequently
visits the low altitudes and might be included in the statistics.
|
Yes, that's what I'm asking. GTO has LEO perigee, but a much higher
(generally GEO altitude) apogee. Is that what's being counted here?
If so, that makes the most sense. But I wouldn't call them LEO
satellites. |
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Tony Lance Guest
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Posted: Sat Jun 16, 2007 9:28 pm Post subject: Re: Inclination angles for LEO satellites |
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Big Bertha Thing balloon
Cosmic Ray Series
Possible Real World System Constructs
http://web.onetel.com/~tonylance/balloon.html
7K Web Page
Astrophysics net ring access site
Newsgroup Reviews including sci.optics
The "Monstre" Balloon
From the book
The Ingoldsby Legends
by the Rev. Richard H. Barham
Published by Richard Edward King,
88 Curtain Road,
London E.C.
Inscribed;-
Barbara Death
From Aunt Emma
March 6th 1921
(C) Copyright Tony Lance 1999
Distribute complete and free of charge to comply.
Big Bertha Thing welfare
29th April 1999
Operations Manager,
The Benefits Agency,
Dear Sirs,
Further to your letter of 28th April 1999,
regarding a list of questions, on the possibility of my working at all.
I will attempt to answer your questions, in order as listed in your letter.
1.I am not working, I am just pottering arround on the internet.
I last registered for course work with the Open University in
1997. This would have involved 6 hours work per week.
I could only manage half-an-hour per day, so totally failed
to do the work or complete the course. Not even one homework
assignment was completed.
In August 1997, I bought a second hand computer for 150 pounds
sterling, and was given free access to the Open University
computer along local telephone lines at a call charge of
1p per minute.
Since that time, I managed to build up a body of correspondence,
within the limits of half-an-hour per day mental or physical work.
In January 1999, this correspondence was transfered by me to my
web site; www.bertha.ndirect.co.uk(since disabled.)
I have to pay 14 pounds and 9p per month for this site.
2.Nobody suggested it, it just happened.
3.My doctor does not know that I have a web site.
4.See answer 1 for description of my activities.
No job is being done, so no job description exists.
5.No employer exists or payments have been recieved.
6.I can think straight for half-an-hour per day.
The rest of the time is spent pottering arround.
I can do one side of A4 paper of mathematics
or computer work per day.
7.On any day free of a major shopping expedition,
I can do half-an-hour of original work and
about an hour of copy typing at non-typist speeds.
8.My principle interest is a 50 year scientific project,
which was started 30 years ago.
If I could spend 48 hours per week doing it I would.
However half-an-hour work and an hour pottering,
seems to be all I can manage and
at that not every day of the week.
Due to my condition, I asked Mrs. Pam S....,
a fellow Open University student to be the project archivist
for my work on the Open University computer.
She agreed and kept the archive of the correspondence
which is now on my web site. This is both an unusual
request and an unusually generous service
to a fellow student on incapacity benefit.
9.Zero income for as far as the eye can see.
10.Not applicable, zero wages or income.
11.August 1997 and is ongoing.
I trust that the above will put the internet feeding frenzy
of the newspaper hype into some perspective.
Thank you,
Tony Lance
judemarie@bigberthathing.co.uk
From: Tony Lance <judemarie@bigberthathing.co.uk>
Newsgroups: swnet.sci.astro,sci.chem
Subject: Re: Big Bertha Thing warlord
Date: Mon, 19 Feb 2007 18:21:24 +0000
Saturday, November 15, 1997 12:40:38 PM
Message
From: Tony Lance
Subject: Re(2): Fwd(3): Outlandish Request for Volunteers
To: Carol Yeats
Cc: Rick Holyomes
George Ho-Yow
FC Mods Discussion
Philip Sims
Big Bertha Thing 6(with apologies for use of CTRL R)
Please accept my apologies for troubling you. It will not of course be repeated.
However 3 mods have responded to my call to help out on the Conf. by volunteering.
In emergency situations, needs must. You and your fellow mods number 3 I see.
Mods have broad shoulders and thick skins and I trust compassion.
Thank you,
Tony Lance.
Big Bertha Thing 7
By way of light relief, a similar general apology, to the one
above, would bring solace and comfort, to the victims of such
well intentioned postings. Please put it in a Big Bertha and
address to CP Conf., Mods Conf. and Philip Sims. That of course,
would be the end of spam. |
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Tony Lance Guest
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Posted: Sun Jun 17, 2007 9:14 pm Post subject: Re: Inclination angles for LEO satellites |
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Big Bertha Thing letter
Cosmic Ray Series
Possible Real World System Constructs
http://web.onetel.com/~tonylance/letter.html
4K Web Page
Astrophysics net ring Access site
Newsgroup Reviews including sci.physics.particle
Letter to a friend explaining Pastures and quest.
From Pastures Software Package Documentation.
(Particle Structure Results Program in Fortran 77.)
Sub-atomic Mesons, Baryons and Leptons Classification System.
(C) Copyright Tony Lance 1997
Distribute complete and free of charge to comply.
Big Bertha Thing folder
Keep busy in your mailbox and put all postings
in a PIP Research folder for safe-keeping in perpetuity,
every night.
Part of your chores would be to read each missive,
subject by subject. Answer it, in a weekly PIP Research
Newsletter or not, as the case may be, which would again,
go rapidly from the mailbox to the folder.
(C) Copyright Tony Lance 1997.
To comply with my copyright,
please distribute complete and free of charge.
Tony Lance
judemarie@bigberthathing.co.uk
From: Tony Lance <judemarie@bigberthathing.co.uk>
Newsgroups: swnet.sci.astro,sci.chem
Subject: Re: Big Bertha Thing warlord
Date: Tue, 20 Feb 2007 13:13:15 +0000
Sunday, November 16, 1997 04:39:18 PM
Message
From: Mansour Abou Jaoudy
Subject: Re: Fwd: Big Bertha Thing 5
To: Tony Lance
Hiya Tony
There are some questions about what do you mean by the postings of "big bertha thing"
thread.
people are confused (me too). it will be nice if you could explain,
before they put you in fire ;-))
take care
Mansour |
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Tony Lance Guest
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Posted: Mon Jun 18, 2007 9:58 pm Post subject: Re: Inclination angles for LEO satellites |
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Big Bertha Thing gyro
Cosmic Ray Series
Possible Real World System Constructs
http://web.onetel.com/~tonylance/gyro.html
Access page JPG 12K Image
Astrophysics net ring Access site
Newsgroup Reviews including alt.war.nuclear
Drawing of an ordinary gyroscope.
Caption:-
Fig. XVI
Extract from the Introductory Chapter:-
But the most interesting top of all is undoubtedly the ordinary
gyroscope. That depicted in Fig. XVI........ although merely
sold as a toy, is nevertheless capable of illustrating
the gyroscopic phenomena which have been so much made use of in
modern mechanical invention.
From the book
An Elementary Treatment of the Theory of
Spinning Tops and Gyroscopic Motion.
By Harold Crabtree M.A.
Formerly Scholar of Pembroke College, Cambridge
Assistant Master at Charterhouse
Longmans, Green and Co. 1923
First Edition 1909
Second Edition 1914
New Impression 1923
(C) Copyright Tony Lance 1998
Distribute complete and free of charge to comply.
Big Bertha Thing rita
Educating Rita
This film portrays a dominant spouse and a long-suffering student,
to the extent upto and including divorce, book-burning and forced
pregnancy.
There was zero privacy. Any attempt to re-register or change
the password would not work, because the secret could not be kept.
Every posting by the spouse is a violation of OU rules and the students
education, causing real pain. Vetting by one moderator or by several
using a non-public Rita conf. would not work, because the spouse
would use the students name, with all the further alienation
that would cause.
A new policy needs to be adopted. The last resort punishment measure,
needs to be the first resort measure on compassionate grounds;
that of making the student read-only on FC. The student would thank
you for it, but not publically.
It would need to be agreed between ACS and OUSA, which is what
they are there for.
Tony Lance
judemarie@bigberthathing.co.uk
Sunday, November 16, 1997 05:19:05 PM
Message
From: Tony Lance
Subject: Re(2): Fwd: Big Bertha Thing 5
To: FC Mods Discussion
First Big Bertha posting was to first aid tent in CP Conf. to provide aid and comfort to
victims who had been set upon by unnamed thugs. There was no way to make direct contact,
with shell shocked victims. The trick worked and first victim is well again.
Since then she has developed a life of her own and actually caught some thugs in the act.
Children will be children. The full set of Big Bertha can be found on CP Conf.
Thank you,
Tony Lance |
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