Oh no, not again

On 18/10/2018 01:38, Quadibloc wrote:
On Wednesday, October 17, 2018 at 3:17:20 PM UTC-6, bilou wrote:
Quadibloc a couché sur son écran :

I'm surprised that the United States doesn't have laws prohibiting the launch
of such payloads by private launch operators. After all, I'm sure they have
restrictions on launching, say, Earth observation satellites with mirrors
above a certain size.

So SPACE is US property ?
I thought only the moon was.

No, but if the U.S. had such laws, they would have at least hindered this launch
by a U.S. artist. It is certainly true that other countries that launch
satellites into space ought to have such policies - if they do not already. From
this news item, it could only be inferred that the United States was lacking
such a restriction.

That one is quite tame really. This is the one to be really worried
about - Chengdu plan to launch an illumination satellite that is 8x
brighter than a full moon and with a ground footprint of 10-80km.

http://chinaplus.cri.cn/news/china/9...18/197439.html

That really will spoil your deep sky imaging when it goes past!

--
Regards,
Martin Brown

Quadibloc wrote:

On Wednesday, October 17, 2018 at 6:41:32 PM UTC-6, Quadibloc wrote:
On Wednesday, October 17, 2018 at 2:17:04 PM UTC-6, Anders Eklöf wrote:

In what way is this contraption worse than one Iridium satellite?
And there are 88 of them, right?

Aside from Iridium satellites - and the ISS - being visible from the
Earth, and aside from them at least serving a useful purpose, the
article gave the impression that this proposed artistic project would be
more *obviously* visible from the Earth than anything existing other
than the Moon.

I did not notice anything specific about its brightness, and I didn't
think to check and compare it to the brightness of satellites already
out there.

Ah, it's a 30-metre diamond-shaped balloon, and it's as bright as the
whole Big Dipper.

And I see that this is less bright than an Iridium flare, which can be
seen in the daytime - it is the result of the antennas focusing multiple
reflections on the same spot on the Earth, so at least there is a low
chance of one, it doesn't happen merely because one of those satellites is
visible in the sky.

And the ISS is certainly reflective and much larger than 30 metres.

John Savard

See my point, I see :-)
But, of course - less useful than Iridium and the ISS.

--
I recommend Macs to my friends, and Windows machines
to those whom I don't mind billing by the hour

On Thursday, 18 October 2018 17:30:45 UTC-4, Anders Eklöf wrote:
Quadibloc wrote:

On Wednesday, October 17, 2018 at 6:41:32 PM UTC-6, Quadibloc wrote:
On Wednesday, October 17, 2018 at 2:17:04 PM UTC-6, Anders Eklöf wrote:

In what way is this contraption worse than one Iridium satellite?
And there are 88 of them, right?

Aside from Iridium satellites - and the ISS - being visible from the
Earth, and aside from them at least serving a useful purpose, the
article gave the impression that this proposed artistic project would be
more *obviously* visible from the Earth than anything existing other
than the Moon.

I did not notice anything specific about its brightness, and I didn't
think to check and compare it to the brightness of satellites already
out there.

Ah, it's a 30-metre diamond-shaped balloon, and it's as bright as the
whole Big Dipper.

And I see that this is less bright than an Iridium flare, which can be
seen in the daytime - it is the result of the antennas focusing multiple
reflections on the same spot on the Earth, so at least there is a low
chance of one, it doesn't happen merely because one of those satellites is
visible in the sky.

And the ISS is certainly reflective and much larger than 30 metres.

John Savard

See my point, I see :-)
But, of course - less useful than Iridium and the ISS.


ISS isn't useful. It's money-pit.

RichA wrote:

On Thursday, 18 October 2018 17:30:45 UTC-4, Anders Eklöf wrote:
Quadibloc wrote:

On Wednesday, October 17, 2018 at 6:41:32 PM UTC-6, Quadibloc wrote:
On Wednesday, October 17, 2018 at 2:17:04 PM UTC-6, Anders Eklöf wrote:

In what way is this contraption worse than one Iridium satellite?
And there are 88 of them, right?

Aside from Iridium satellites - and the ISS - being visible from the
Earth, and aside from them at least serving a useful purpose, the
article gave the impression that this proposed artistic project would be
more *obviously* visible from the Earth than anything existing other
than the Moon.

I did not notice anything specific about its brightness, and I didn't
think to check and compare it to the brightness of satellites already
out there.

Ah, it's a 30-metre diamond-shaped balloon, and it's as bright as the
whole Big Dipper.

And I see that this is less bright than an Iridium flare, which can be
seen in the daytime - it is the result of the antennas focusing multiple
reflections on the same spot on the Earth, so at least there is a low
chance of one, it doesn't happen merely because one of those satellites is
visible in the sky.

And the ISS is certainly reflective and much larger than 30 metres.

John Savard

See my point, I see :-)
But, of course - less useful than Iridium and the ISS.


ISS isn't useful. It's money-pit.

That's an opinion, not a fact.

--
I recommend Macs to my friends, and Windows machines
to those whom I don't mind billing by the hour

bilou a émis l'idée suivante :
Quadibloc a couché sur son écran :
Saw this news item:

https://www.universetoday.com/140246...-a-few-months/

I'm surprised that the United States doesn't have laws prohibiting the
launch of such payloads by private launch operators. After all, I'm sure
they have restrictions on launching, say, Earth observation satellites with
mirrors above a certain size.

John Savard

So SPACE is US property ?
I thought only the moon was.

Nothing new and "Much a do about nothing":
https://en.wikipedia.org/wiki/Project_Echo

On Thursday, October 18, 2018 at 8:54:10 AM UTC-6, Martin Brown wrote:
On 18/10/2018 01:38, Quadibloc wrote:
On Wednesday, October 17, 2018 at 3:17:20 PM UTC-6, bilou wrote:
Quadibloc a couché sur son écran :

I'm surprised that the United States doesn't have laws prohibiting the launch
of such payloads by private launch operators. After all, I'm sure they have
restrictions on launching, say, Earth observation satellites with mirrors
above a certain size.

So SPACE is US property ?
I thought only the moon was.

No, but if the U.S. had such laws, they would have at least hindered this launch
by a U.S. artist. It is certainly true that other countries that launch
satellites into space ought to have such policies - if they do not already. From
this news item, it could only be inferred that the United States was lacking
such a restriction.

That one is quite tame really. This is the one to be really worried
about - Chengdu plan to launch an illumination satellite that is 8x
brighter than a full moon and with a ground footprint of 10-80km.

http://chinaplus.cri.cn/news/china/9...18/197439.html

That really will spoil your deep sky imaging when it goes past!

Since they want to save money on street lighting in Chengdu, maybe it will be
geosynchronous.

John Savard

On Saturday, 20 October 2018 14:51:39 UTC-4, Quadibloc wrote:
On Thursday, October 18, 2018 at 8:54:10 AM UTC-6, Martin Brown wrote:
On 18/10/2018 01:38, Quadibloc wrote:
On Wednesday, October 17, 2018 at 3:17:20 PM UTC-6, bilou wrote:
Quadibloc a couché sur son écran :

I'm surprised that the United States doesn't have laws prohibiting the launch
of such payloads by private launch operators. After all, I'm sure they have
restrictions on launching, say, Earth observation satellites with mirrors
above a certain size.

So SPACE is US property ?
I thought only the moon was.

No, but if the U.S. had such laws, they would have at least hindered this launch
by a U.S. artist. It is certainly true that other countries that launch
satellites into space ought to have such policies - if they do not already. From
this news item, it could only be inferred that the United States was lacking
such a restriction.

That one is quite tame really. This is the one to be really worried
about - Chengdu plan to launch an illumination satellite that is 8x
brighter than a full moon and with a ground footprint of 10-80km.

http://chinaplus.cri.cn/news/china/9...18/197439.html

That really will spoil your deep sky imaging when it goes past!

Since they want to save money on street lighting in Chengdu, maybe it will be
geosynchronous.

John Savard

It had better be. I'd love to see a class action lawsuit from about 100 million people hit the World Court. Not that the Chinese would care, darlings of the Left in the West that they are.