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#leo

2 posts2 participants1 post today
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Public
Spaceflight 🚀

#Falcon1 failed three times before tasting success. #Spectrum is somewhat larger and more capable than Falcon 1, with performance in line with #Firefly's Alpha rocket.

The fully assembled Spectrum rocket stands about 28 meters 📏 tall and measures more than 2 meters in diameter. The expendable launcher is designed to haul payloads up to 1 metric ton (2,200 pounds) into #LEO arstechnica.com/space/2025/03/

Ars Technica · This launcher is about to displace the V-2 as Germany’s largest rocketBy Stephen Clark
#Isar
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Dr. John Barentine FRAS

A couple of abstracts relevant to the space environment from the upcoming European Geosciences Union (Vienna, 27 April–2 May 2025):

“Defining the environmental impacts of satellite megaconstellation missions in a rapidly growing space sector” meetingorganizer.copernicus.or

“Survey of the estimated mass of ablated material and intact debris from ‘end-of-life’ LEO spacecraft entering the atmosphere” meetingorganizer.copernicus.or

meetingorganizer.copernicus.orgAbstract EGU25-17301
#Space#Spacecraft#SpaceEnvironment
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JJ Celery

If you're a woman living in Dublin and either a sole trader, running a business, or vaguely considering doing so, LEO WIB group is amazing, and hands down the best fifty quid I spend each year.

You get aforementioned Weekly Coffee Zoom, a monthly in-person event, and twice a year they really push the boat out for Summmer Event and the Christmas Party.

localenterprise.ie/DublinCity/

www.localenterprise.ieLocal Enterprise Office Dublin City Women in Business Network - Local Enterprise Office - DublinCity
#LEO#mastodoine
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JJ Celery

I'm a member of the Dublin Local Enterprise Office group for Women in Business and we do weekly Zoom meetings. Sometimes it's just a coffee meetup, sometimes it's a talk from a member who shares their expertise on a niche subject.

Today that expert was me! 🎉

My expert talk was a very condensed primer on FOSS and The Fediverse where I only uhm a million times. @mastodonie gets mentioned a bit 😉

For a limited time only you can watch it here!

#fediverse#mastodon#foss
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Dr. John Barentine FRAS

There are reports that the brightness of some of the Chinese #Qianfan satellites is varying on short timescales. (e.g., satobs.org/seesat/Mar-2025/004)

This behavior suggests that these satellites (and possibly others) from the second Qianfan launch are currently tumbling in orbit.

www.satobs.orgSTARLINK, QIANFAN OBS from JAY RESPLER via Seesat-l on 2025-03-18 (SeeSat-L Mar-25)
#Space#Satellites#China
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Kevin Karhan :verified:

@pavel23 #Starlink doesn't need to #leak coordinates, those array antennas are trivial to target just by the fact they have know uplink frequencies and constantly switch satellites overhead.

  • And since they are in #LEO and not #GSO one can't just setup some "Tunnel" like a #Troposcatter to make it hard to find them.

Pretty shure I can build a #drone that can detect and map Starlink terminals for less than €10M...

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Dietrich Feist

@Brad_Rosenheim @sundogplanets

I do not like #ElonMusk and I believe that #Starlink's usefulness is totally outweighed by the many impacts it has on limited global resources like space in the #LEO.

However, it is currently not clear whether the current levels of aluminum oxides from reentering satellites could pose a threat to the ozone layer. Even though the amount of Al in stratospheric aerosols (of which we have only limited samples) has been increasing, the total mass of anthropogenic Al oxides is still orders of magnitude smaller than the natural injection of metal oxides from meteorites - which itself is small compared to stratospheric aerosol injection from volcanoes.

Also, it is quite likely that most of the anthropogenic Al in the stratosphere is actually emitted from solid rocket motors (SRM) and not satellites upon reentry.

There was a paper in #GRL last year that tried to sum up what we know. As an atmospheric scientist, I do not agree with all their conclusions but it is still worth reading.

doi.org/10.1029/2024GL109280

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Dr. John Barentine FRAS

"As the #LEO ecosystem enters a new era of commercial space stations, it is paramount that we as a nation continue to seed this fertile field of microgravity research without interruption. On future commercial LEO destinations, how will fundamental #research be prioritized among competing interests such as applied #R&D, manufacturing, and tourism? We must not lose sight of the value of fundamental science, as the seeds sown today grow to produce technological innovations of the future."

issnationallab.org/iss360/reev

ISS National Lab · Continuous Technical Innovation Requires Continuity of Fundamental ResearchThe ISS National Lab will continue to support R&D that brings to fruition the innovations sown by decades of research in LEO.
#Space#Science#StandUpForScience
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