<!DOCTYPE html><html><head><title></title><style type="text/css">p.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><div style="font-family:Arial;">Daniel Suarez’s latest book, Delta-V, is great read - lots about the junk in orbit, the futility of Mars, and the viability of asteroid mining. Even has a Musk type ‘hero’.<br></div><div style="font-family:Arial;">dve west<br></div><div style="font-family:Arial;"><br></div><div style="font-family:Arial;"><br></div><div>On Mon, May 27, 2019, at 9:12 PM, Steven A Smith wrote:<br></div><blockquote type="cite" id="qt"><div style="font-family:Arial;"><br></div><div class="qt-moz-forward-container"><another long-winded
anecdote> <br></div><div class="qt-moz-forward-container"><div style="font-family:Arial;">I was born "under the rising sign
of Sputnik" in 1957 (S1 & S2 went up late that year). I was
just about 1 year old when Explorer 1 and then Vanguard 1 went up
in early 1958. Vanguard 1, 2, 3 are still up there, being in an
unusually high orbit for the time. The crowdsource <a href="https://www.universetoday.com/100744/citizen-science-old-school-style-the-true-tale-of-operation-moonwatch/">Moonwatch</a> project was already developing and was used to try to track/find
Vanguard, but the first siting of an artificial satellite was of
Sputnik. Ham radio folks were tracking the radio signals, but
visual siting (telescope or binoculars) was much trickier.<br></div><div style="font-family:Arial;"> <br></div><p>Some here were born early enough to have been young adults at
that time and probably have first-hand memories of these events,
and perhaps even attempting their own observations? My first
experience with direct satellite observation was *probably* when
the <a href="https://en.wikipedia.org/wiki/Project_Echo">Echo </a>"satelloons"
were up. At roughly 100' diameter with a deliberately
reflective surface (passive microwave relays), they were
apparently highly visible to the naked eye. <br></p><p>We've come a long way baby! </anecdote><br></p><p><speculation> We (humans collectively) now have
something approaching 10,000 satellites or fragments in
orbit... one man's "trash" is another man's "treasure" of
course. I haven't heard Musk announce a SpaceX "Salvage
Operation" yet, but at some point, that seems like a viable
business, given the expense of launch... the materials in
derelict satellites would seem to be valuable once a method for
"recycling" those materials could be developed. I believe we
are still in the early stages of a "radiation" of design-species
in satellites, not having settled on any specific body plan and
functional conceit... some might eventually depend on a modest
amount of "foraging" once in orbit? <br></p><p>Delta-V is clearly the most valuable resource which for all but
solar/mag-sail propulsion depends on reaction mass... which
suggests turning "big ones into little ones" with space junk
(grapefruit to bus-sized objects) into streams of (ionized)
particles as small as individual molecules. Variations on
"tether" and "sail" technology also may be good uses of captured
"space junk". A big challenge to all this is the orbital
mechanics sophistication to use less DeltaV matching orbits to
"catch" junk than is gained by capturing it. Oh yeh... and
still do something actually useful besides just wander around
eating and pooping things.<br></p><p><speculation><br></p><p><br></p><div class="qt-moz-cite-prefix">On 5/27/19 10:09 AM, Owen Densmore
wrote:<br></div><blockquote cite="mid:CAN_LYRn3N=30DcjFjZDF1aiMwjKNGTDHAAnj3P_suAjnKAQkuA@mail.gmail.com" type="cite"><div dir="ltr"><div style="font-family:arial, helvetica, sans-serif;font-size:small;color:rgb(0, 0, 0);" class="qt-gmail_default">A
TLDR post. It points to a video of the "train" but brings up
problems with the eventual number of the critters.<br></div><div style="font-family:arial, helvetica, sans-serif;font-size:small;color:rgb(0, 0, 0);" class="qt-gmail_default"><br></div><div style="font-family:arial, helvetica, sans-serif;font-size:small;color:rgb(0, 0, 0);" class="qt-gmail_default">
-- Owen<br></div><div style="font-family:arial, helvetica, sans-serif;font-size:small;color:rgb(0, 0, 0);" class="qt-gmail_default"><p style=""><span style="color:rgb(34, 34, 34)" class="colour"><span style="font-family:Arial, Helvetica, sans-serif" class="font"><span style="font-size:18px" class="size"><a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fwww.geekwire.com%2F2019%2Fsightings-spacexs-starlink-satellites-spark-awe-astronomical-angst%2F/1/0100016af8bd48bf-94af9903-5a99-4bdc-914c-330937053b7f-000000/1p5yHFi__nt-eWCq_QXyb1VvhqluhaiG5EZV4OIiDqY=90">Sightings of
SpaceX’s Starlink satellites spark awe — and
astronomical angst (3 minute read)</a></span></span></span><br></p><p style=""><span style="color:rgb(34, 34, 34)" class="colour"><span style="font-family:Arial, Helvetica, sans-serif" class="font"><span style="font-size:16px" class="size">SpaceX
has launched 60 of its Starlink broadband satellites into
the sky, creating a chain of satellites that could be
observed by enthusiasts in a number of locations around
the world. Some astronomers have expressed concern that
the brightness from the satellites will interfere with
observations of the night sky, especially when all 11,000
satellites are deployed. Elon Musk has confirmed that the
satellites will be dark when the stars are visible.</span></span></span><br></p></div></div><div style="font-family:Arial;"><br></div><div class="qt-gmail_quote"><div class="qt-gmail_attr" dir="ltr">On Mon, May 27, 2019 at 9:57
AM Stephen Guerin <<a href="mailto:redfishgroupllc@gmail.com">redfishgroupllc@gmail.com</a>>
wrote:<br></div><blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204, 204, 204);padding-left:1ex;" class="qt-gmail_quote"><div dir="auto">Any idea on how far separated ground cameras
would need to to get triangulate 3d using a shift in the
apparent RA and declination of the background start field?<br></div><div style="font-family:Arial;"><br></div><div class="qt-gmail_quote"><div class="qt-gmail_attr" dir="ltr">On Mon, May 27, 2019,
8:49 AM Roger Critchlow <<a href="mailto:rec@elf.org">rec@elf.org</a>>
wrote:<br></div><blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204, 204, 204);padding-left:1ex;" class="qt-gmail_quote"><div dir="ltr"><div style="font-family:Arial;">The prediction has shifted to a few
minutes earlier tonight, appears 20h53, disappears
21h04, track passes close to Vega then close to
Arcturus. <br></div><div><br></div><div>-- rec --<br></div></div><div style="font-family:Arial;"><br></div><div class="qt-gmail_quote"><div class="qt-gmail_attr" dir="ltr">On Sun, May 26, 2019
at 10:15 PM Roger Critchlow <<a rel="noreferrer" href="mailto:rec@elf.org">rec@elf.org</a>>
wrote:<br></div><blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204, 204, 204);padding-left:1ex;" class="qt-gmail_quote"><div dir="ltr"><div style="font-family:Arial;">They were early, about 21h40m at the
meridian, three were bright from 45d altitude,
others may have flickered into visibility or may
have been my imagination. <br></div><div><br></div><div><span style="font-family:arial, sans-serif" class="font">The predicted
pass in Santa Fe for Monday the 27th of May is
from 21h01m10s to <span style="color:rgb(0, 0, 0)" class="colour">21h12m23s, from SW
to NE again, passing close to Vega. Give
yourself some slack on the time, the speed
depends on the altitude and the satellites
are supposed to be boosting higher ever 90
minutes.</span></span><br></div><div><span style="font-family:arial, sans-serif" class="font"><span style="color:rgb(0, 0, 0)" class="colour"></span></span><br></div><div><span style="font-family:arial, sans-serif" class="font"><span style="color:rgb(0, 0, 0)" class="colour">-- rec --</span></span><br></div><div><span style="font-family:arial, sans-serif" class="font"><span style="color:rgb(0, 0, 0)" class="colour"></span></span><br></div></div><div style="font-family:Arial;"><br></div><div class="qt-gmail_quote"><div class="qt-gmail_attr" dir="ltr">On Sun, May 26,
2019 at 12:03 PM Roger Critchlow <<a rel="noreferrer" href="mailto:rec@elf.org">rec@elf.org</a>>
wrote:<br></div><blockquote style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204, 204, 204);padding-left:1ex;" class="qt-gmail_quote"><div dir="ltr"><div style="font-family:Arial;"><span style="font-family:arial, sans-serif" class="font">According
to <a rel="noreferrer" href="http://calsky.com">calsky.com</a> the
trail of the 60 starlink satellites rises in
Santa Fe this evening at <span style="color:rgb(0, 0, 0)" class="colour">21h40m28s in the
SW </span><span style="color:rgb(0, 0, 0)" class="colour">and
sets at </span><span style="color:rgb(0, 0, 0)" class="colour">21h51m43s in the
NE. They are 8.5mag at the horizon which
is too dim to see, but they should reach
4.7mag at the meridian at </span><span style="color:rgb(0, 0, 0)" class="colour">21h46m17s. Looks
like they'll pass close to the last star
in the big dipper's handle.</span></span> <br></div><div><span style="font-family:arial, sans-serif" class="font"><span style="color:rgb(0, 0, 0)" class="colour"></span></span><br></div><div><span style="font-family:arial, sans-serif" class="font"><span style="color:#000000" class="colour">-- rec --</span></span><br></div><div><span style="font-family:arial, sans-serif" class="font"><span style="color:#000000" class="colour"></span></span><br></div></div></blockquote></div></blockquote></div><div style="font-family:Arial;">_______________________________________________<br></div><div style="font-family:Arial;"> Wedtech mailing list<br></div><div style="font-family:Arial;"> <a rel="noreferrer" href="mailto:Wedtech@redfish.com">Wedtech@redfish.com</a><br></div><div style="font-family:Arial;"> <a rel="noreferrer noreferrer" href="http://redfish.com/mailman/listinfo/wedtech_redfish.com">http://redfish.com/mailman/listinfo/wedtech_redfish.com</a><br></div></blockquote></div><div style="font-family:Arial;">_______________________________________________<br></div><div style="font-family:Arial;"> Wedtech mailing list<br></div><div style="font-family:Arial;"> <a href="mailto:Wedtech@redfish.com">Wedtech@redfish.com</a><br></div><div style="font-family:Arial;"> <a rel="noreferrer" href="http://redfish.com/mailman/listinfo/wedtech_redfish.com">http://redfish.com/mailman/listinfo/wedtech_redfish.com</a><br></div></blockquote></div><div style="font-family:Arial;"><br></div><pre wrap="" class="qt-moz-quote-pre">_______________________________________________
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