> L5 Society was the best name I ever came up with
John K Clark
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The reason was the merger with L-5 Society and National Space Institute (sometime referred to as No Space Intelligence).
Jerry
What about habitats in an Earth-Moon Hilda orbit?
‘The Hilda Habitats’
Closer than L4 or L5. Resonant with the Moon. Close to GEO at Perigee, and to EM L1 altitude at apogee..
Can be fed by mass launched from Moon, or imported from NEAs.
Comments?
Mark
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Mark J Sonter, mobile 0447 755 598 (delete '0' & replace with '61' country code if calling from overseas)
Director & Principal Consultant, Radiation Advice & Solutions Pty Ltd, abn 31 891 761 435
Principal, Asteroid Enterprises Pty Ltd, abn 53 008 115 302
Chairman, Off Earth Resources Pty Ltd, abn 31 664 219 372
Adjunct Assoc Prof, Andy Thomas Centre for Space Resources, Univ of Adelaide
116 Pennine Drive, South Maclean, Queensland 4280, Australia
Please use marks...@gmail.com for general or radiation related communications, and
mark....@asteroidenterprises.com for space related topics.
“Keep everything as simple as possible, but no simpler” - A. Einstein
To view this discussion visit https://groups.google.com/d/msgid/power-satellite-economics/002101dcf35b%242ecf3fe0%248c6dbfa0%24%40millennium-project.org.
Mark;
Interesting. I assume that you mean an orbit in a 3:2 orbital resonance with the Moon, just as Hilda is in a 3:2 orbital resonance with Jupiter?
Has anyone published anything on the orbital dynamics of such a quasi-Hilda in the Earth-Moon system? If so, I’d be interested to take a look.
- Kieran
From: Paul Werbos <paul....@gmail.com>
Sent: Thursday, June 4, 2026 7:25 AM
To: Mark Sonter <mark....@asteroidenterprises.com>
Cc: jerome...@millennium-project.org; John Clark <johnk...@gmail.com>; Keith Henson <hkeith...@gmail.com>; ExI chat list <extrop...@lists.extropy.org>; extro...@googlegroups.com; Power Satellite Economics <power-satell...@googlegroups.com>
Subject: Re: Need creative help
Back when I created the NSF-NASA initiative on space solar power, (with The Millennium Project DOE funded global research to trigger it <smile>) the use of these orbits as an alternative path towards fulfilling the vision of Gerard K. O'Neill would have been well within the scope, as a research issue to figure out the tradeoffs. I would guess our reviewers would agree that it is a reasonable approach worth evaluating, but might ask how important it is compared to other things requiring NSF style support. Lately, I do not see much strategic thinking on that in the US; a lot of what I see is much stronger in PR than on serious, hard science and optimization.
Paul-
Teilhard de Chardin, eh?
French Jesuit, palaeontologist, philosopher, and visionary-of-the-future-of Humanity… probably the most interesting commentator of the early 20th century on ‘how to meld science with faith’ – which got him a long and loud ‘STFU’ from the Vatican..
His concept of the ‘noosphere’ -the evolving planetary mind- in analogy with the biosphere - has now got its superstructure well-and-truly in place thanks to the Internet and its spear-point, Elon’s ‘X’. The tension between the centrifugal (splitting into subspecies) and centripetal (unifying influences) plays out in the daily X commentaries.
Most obviously, the planetary Overview Effect and the ever-greater connectedness worldwide are drawing truth out, and illuminating the oneness of the world.. and drawing people together.. ‘whatever happens to you in Europe / US / Asia affects me in Australia’ sort of thing. ‘When you bleed, I bleed.’
The controversial idea that this was a process of ‘Christogenesis’ was what got TdeCh closest to being excommunicated..
But it sure as hell was a good philosophical basis for a ‘Manifest Destiny’ view of Humanity’s place in the Universe…
Mark
--
Mark J Sonter, mobile 0447 755 598 (delete '0' & replace with '61' country code if calling from overseas)
Director & Principal Consultant, Radiation Advice & Solutions Pty Ltd, abn 31 891 761 435
Principal, Asteroid Enterprises Pty Ltd, abn 53 008 115 302
Chairman, Off Earth Resources Pty Ltd, abn 31 664 219 372
Adjunct Assoc Prof, Andy Thomas Centre for Space Resources, Univ of Adelaide
116 Pennine Drive, South Maclean, Queensland 4280, Australia
Please use marks...@gmail.com for general or radiation related communications, and
mark....@asteroidenterprises.com for space related topics.
“Keep everything as simple as possible, but no simpler” - A. Einstein
During my youth as a student at a Catholic high school, I had the opportunity to study the teachings of Fr. TdC during my teenage years. It is important to note that he was not subject to any form of banishment or ostracism. In fact, his teachings were highly regarded and respected within the school community.

On Jun 4, 2026, at 10:04 PM, Mark Sonter <mark....@asteroidenterprises.com> wrote:
External Message: Use Caution
Hi Kieran,
A 3:1 lunar resonant orbit (ie 9-day period) will have a perigee a couple of thousand km above GEO and an apogee a couple of thousand km below EM L1 altitude, but 180 degrees away (work it out).
We had a bit of a look at this when I was associated with Deep Space Industries, but nothing was ever written up / published.
Cheers,
Mark
--
Mark J Sonter, mobile 0447 755 598 (delete '0' & replace with '61' country code if calling from overseas)
Director & Principal Consultant, Radiation Advice & Solutions Pty Ltd, abn 31 891 761 435
Principal, Asteroid Enterprises Pty Ltd, abn 53 008 115 302
Chairman, Off Earth Resources Pty Ltd, abn 31 664 219 372
Adjunct Assoc Prof, Andy Thomas Centre for Space Resources, Univ of Adelaide
116 Pennine Drive, South Maclean, Queensland 4280, Australia
Please use marks...@gmail.com for general or radiation related communications, and
mark....@asteroidenterprises.com for space related topics.
“Keep everything as simple as possible, but no simpler” - A. Einstein
To view this discussion visit https://groups.google.com/d/msgid/power-satellite-economics/07df01dcf410%24b9fc3540%242df49fc0%24%40sympatico.ca.
Thanks Mark.
Greetings,
In our 2022-2023 GEO-LPS feasibility study for ESA we looked at the Lunar Space Elevator as a core element of cislunar transportation system - basically as an alternative to using a mass-driver which may be used (although difficult) for launching raw materials from the lunar surface - but not suitable for transporting finished lunar manufactured components for Solar Power Satellites to an assembly location at EM-L1 which was the focus of our study.
Our analysis of using a LSE was published in JBIS in 2023.
Two videos illustrating our LSE concept are also on this page.
https://astrostrom.ch/jbis-the-lunar-space-elevator-and-the-geo-lps/
The JBIS paper can be downloaded here: https://astrostrom.ch/docs/JBIS-6-Lunar-Space-Elevator.pdf
Best regards,
Arthur Woods
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