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 Post subject: Starlink Satellites
PostPosted: Fri Feb 14, 2020 8:35 am 
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Joined: Tue Jan 14, 2020 7:27 am
Posts: 25
14th Feb, MMXX; about 0516-0518UT; awoke and rose to use the facilities and make tea, and on looking out the bedroom window on a clear sky, I was mystified as to which constellation was on display. Looked with binoculars to see that two were moving in unison down through Cygnus. At about third magnitude it was no wonder I was confused. Checking Heavens-above later discovered that they where two Starlink Satellites...which two I cannot say, as there were so many listed there! regards maf.


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 Post subject: Re: Starlink Satellites
PostPosted: Fri Feb 14, 2020 7:04 pm 
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Joined: Fri Dec 03, 2004 9:58 pm
Posts: 3609
Location: Wellingborough
From spaceweather.com for 2020 Feb 14:
https://www.spaceweather.com/

NEW IAU STATEMENT ON SATELLITE MEGA-CONSTELLATIONS

<quote
The night sky is in danger. This has been true for years as urban landscapes became increasingly light-polluted. But now there's a new threat, one you can't escape by driving into the countryside. It's the "mega-constellation." Some companies are planning to launch tens of thousands of internet satellites into low-Earth orbit. The recent launch by Space X of just 240 Starlink satellites has already ruined many astronomical observations.

This week the International Astronomical Union (IAU) issued a new press release describing the impact of satellite mega-constellations on astronomy. IAU astronomers simulated 25,000 satellites similar in type to the satellites of SpaceX, Amazon, and OneWeb.
see the spaceweather link for details of IAU findings

There are no international rules governing the brightness of orbiting manmade objects. Until now, they didn't seem to be necessary. Mega-constellations, however, threaten "the uncontaminated view of the night sky from dark places, which should be considered a non-renounceable world human heritage," says the press release. Therefore the IAU will present its findings at meetings of the UN Committee for Peaceful Uses of Outer Space, bringing the attention of this problem to world leaders.
>unquote

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Brian
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Wellingborough UK.

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 Post subject: Re: Starlink Satellites
PostPosted: Fri Feb 14, 2020 7:30 pm 
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Joined: Fri Dec 03, 2004 9:58 pm
Posts: 3609
Location: Wellingborough
From "Sky and Telescope" magazine vol. 139 no. 3, March 2020 pp. 14-21

"The New Space Race"
"Will satellites outnumber the stars?"

From the above:

"21.3 million Americans lack broadband internet according to 2019 FCC report"

"Companies are competing for a $1trillion dollar market, aiming to serve billions of people worldwide. Even a small percentage of this global market promises billions of dollars in revenue"

"The more crowded the sky, the less possible avoidance becomes . At tens of thousands of satellites it becomes a wild goose chase trying to find an opening (for observing/imaging)"

"Taming the Wild West. SpaceX has also filed paperwork with the ITU for an additional 30,000 satellites . The request indicates that megaconstellations are a reality that astronomers won't be able to avoid"

"There isn't anything that protects the night sky from satellites in low earth orbit except for a single Federal law against "obtrusive space advertising".

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Brian
52.3N 0.6W
Wellingborough UK.

254mm LX90 on Superwedge, WO ZS66SD, Helios 102mm f5 on EQ1, Hunter 11x80, Pentax 10x50
ASI120MC Toucam Pros 740k/840k/900nc mono, Pentax K110D
Ro-Ro roof shed


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