Calgarypuck Forums - The Unofficial Calgary Flames Fan Community
Old 01-04-2022, 11:52 AM   #41
zamler
Lifetime Suspension
 
Join Date: Feb 2008
Exp:
Default

Quote:
Originally Posted by You Need a Thneed View Post
It’s not slowing to zero, if that’s what you based your calculation on.
Okay then what speed will be at and relative to what when fully deployed.
zamler is offline   Reply With Quote
Old 01-04-2022, 12:11 PM   #42
GGG
Franchise Player
 
GGG's Avatar
 
Join Date: Aug 2008
Exp:
Default

Quote:
Originally Posted by zamler View Post
Okay then what speed will be at and relative to what when fully deployed.
The problem is it appears to be report velocity in rectilinear cordinates relative to the earth. You really need to know it’s radial velocity away from the sun and it’s angular velocity

It will have an angular velocity relative to the Sun of 365/360 degrees per day and equal to the earth.


But if you want the satellites linear velocity relative to the earth perpendicular to the earth/sun. The Earth moves at about 67000 MPH and is 93 Million miles away. The Lagrange 2 is 1 million miles away. So 18.6/93 = (X+18.6)/94 So X = .211 MI/second.

Last edited by GGG; 01-04-2022 at 12:27 PM.
GGG is offline   Reply With Quote
The Following User Says Thank You to GGG For This Useful Post:
Old 01-04-2022, 12:16 PM   #43
Fuzz
Franchise Player
 
Fuzz's Avatar
 
Join Date: Mar 2015
Exp:
Default

Did you just do space math using miles? We are better than that!
Fuzz is online now   Reply With Quote
The Following User Says Thank You to Fuzz For This Useful Post:
Old 01-04-2022, 12:19 PM   #44
BoLevi
First Line Centre
 
Join Date: Mar 2019
Exp:
Default

Quote:
Originally Posted by Scroopy Noopers View Post
Maybe it would be better to understand what you think is happening.

They burn to eject earth orbit (which doesn’t mean it doesn’t feel the effects of earths gravity), with enough steam to carry the to their location (with correction burns factored in). It’s part of what takes so long. They can’t cruise there burnin the whole way and then burn retro to stop (the telescope can’t turn around, that would take a ton of extra fuel, also would likely need addition front facing boosters to complete, etc…). They utilize as much gravity slowing as they can.
The bigger problem than fuel is that they can't turn JWST around because exposure to the sun would damage the instruments.
BoLevi is offline   Reply With Quote
Old 01-04-2022, 12:20 PM   #45
GGG
Franchise Player
 
GGG's Avatar
 
Join Date: Aug 2008
Exp:
Default

Quote:
Originally Posted by Fuzz View Post
Did you just do space math using miles? We are better than that!
If it’s good enough to crash a Mars rover it’s good enough for me.
GGG is offline   Reply With Quote
The Following 6 Users Say Thank You to GGG For This Useful Post:
Old 01-04-2022, 12:20 PM   #46
Scroopy Noopers
Pent-up
 
Scroopy Noopers's Avatar
 
Join Date: Mar 2018
Location: Plutanamo Bay.
Exp:
Default

Quote:
Originally Posted by BoLevi View Post
The bigger problem than fuel is that they can't turn JWST around because exposure to the sun would damage the instruments.
Yup, first point in my list. Although I didn’t provide reasoning.
Scroopy Noopers is offline   Reply With Quote
Old 01-04-2022, 03:37 PM   #47
You Need a Thneed
Voted for Kodos
 
You Need a Thneed's Avatar
 
Join Date: Dec 2007
Exp:
Default

Quote:
Originally Posted by BoLevi View Post
The bigger problem than fuel is that they can't turn JWST around because exposure to the sun would damage the instruments.
Which is why they have been slightly under burning each time they burn the engines. They cant go too far.
__________________
My LinkedIn Profile.
You Need a Thneed is offline   Reply With Quote
Old 01-05-2022, 08:37 AM   #48
photon
The new goggles also do nothing.
 
photon's Avatar
 
Join Date: Oct 2001
Location: Calgary
Exp:
Default

__________________
Uncertainty is an uncomfortable position.
But certainty is an absurd one.
photon is offline   Reply With Quote
The Following 3 Users Say Thank You to photon For This Useful Post:
Old 01-05-2022, 09:15 PM   #49
driveway
A Fiddler Crab
 
driveway's Avatar
 
Join Date: Jan 2007
Location: Taipei, Taiwan
Exp:
Default

Just sitting at home on winter break and I did the math for fun. 13.3 hours to 1 million kilometers away from earth at current speed, though I think it's slowing down a little, so it might take just a little longer than that.
driveway is offline   Reply With Quote
Old 01-05-2022, 09:50 PM   #50
#-3
#1 Goaltender
 
Join Date: Mar 2008
Exp:
Default

Quote:
Originally Posted by driveway View Post
Just sitting at home on winter break and I did the math for fun. 13.3 hours to 1 million kilometers away from earth at current speed, though I think it's slowing down a little, so it might take just a little longer than that.
2/3 of the trip took 11 days
1/3 of the trip will take 18 days.

https://www.jwst.nasa.gov/content/we...ereIsWebb.html

Probably the best analogy I think of for how it will move, is a curling draw. Big push to have it slow down and land just inside a predetermined pocket.

Except as discussed earlier "stopping", is basically slowing down to an orbital speed just a little faster than earth.
#-3 is offline   Reply With Quote
The Following User Says Thank You to #-3 For This Useful Post:
Old 01-05-2022, 09:54 PM   #51
malcolmk14
Franchise Player
 
malcolmk14's Avatar
 
Join Date: Jan 2008
Exp:
Default

Man, space is crazy
malcolmk14 is offline   Reply With Quote
The Following 3 Users Say Thank You to malcolmk14 For This Useful Post:
Old 01-05-2022, 10:28 PM   #52
FlamesAddiction
Franchise Player
 
FlamesAddiction's Avatar
 
Join Date: Oct 2001
Location: Vancouver
Exp:
Default

Quote:
Originally Posted by driveway View Post
Just sitting at home on winter break and I did the math for fun. 13.3 hours to 1 million kilometers away from earth at current speed, though I think it's slowing down a little, so it might take just a little longer than that.
Yeah, at one point I think it was going over 2 km/second.

I was kind of curious, but is the timing of all the events preprogrammed to take place, or does someone from NASA have to send a signal? I was also wondering what the ETA is for the first bit of data to be transmitted back to Earth and images generated for the public to see.
__________________
"A pessimist thinks things can't get any worse. An optimist knows they can."

Last edited by FlamesAddiction; 01-05-2022 at 10:45 PM.
FlamesAddiction is online now   Reply With Quote
Old 01-05-2022, 10:43 PM   #53
BoLevi
First Line Centre
 
Join Date: Mar 2019
Exp:
Default

Quote:
Originally Posted by FlamesAddiction View Post
Yeah, at one point I think it was going over 2 km/second.

I was kind of curious, but is the timing of all the events preprogrammed to take place, or does someone from NASA had to send a signal? I was also wondering what the ETA is for the first bit of data to be transmitted back to Earth and images generated for the public to see.
It's manual right now.

Images will come pretty fast but they still be for calibration. Actual science is a few months away.
BoLevi is offline   Reply With Quote
The Following User Says Thank You to BoLevi For This Useful Post:
Old 01-05-2022, 11:03 PM   #54
You Need a Thneed
Voted for Kodos
 
You Need a Thneed's Avatar
 
Join Date: Dec 2007
Exp:
Default

Approximately 6 months until we see real data coming back.

It has to cool down, which takes several months, and then after that, they have to align and calibrate everything.
__________________
My LinkedIn Profile.
You Need a Thneed is offline   Reply With Quote
Old 01-05-2022, 11:07 PM   #55
Mr.Coffee
damn onions
 
Mr.Coffee's Avatar
 
Join Date: Mar 2006
Exp:
Default

The super advanced alien race Lanny keeps talking about in the other thread probably thinks this little telescope is so adorable.
Mr.Coffee is offline   Reply With Quote
Old 01-06-2022, 03:19 AM   #56
Huntingwhale
Franchise Player
 
Huntingwhale's Avatar
 
Join Date: Sep 2008
Exp:
Default

Quote:
Originally Posted by #-3 View Post
2/3 of the trip took 11 days
1/3 of the trip will take 18 days.

https://www.jwst.nasa.gov/content/we...ereIsWebb.html

Probably the best analogy I think of for how it will move, is a curling draw. Big push to have it slow down and land just inside a predetermined pocket.

Except as discussed earlier "stopping", is basically slowing down to an orbital speed just a little faster than earth.
That's probably the best analogy I've seen, and pretty much how it will reach it's point. Fast acceleration to start and soft enough at the end to land on the target. JW isn't going to slam on the brakes at the end. Will be a nice smooth arrival at L2 at the perfect speed to enter orbit.
Huntingwhale is offline   Reply With Quote
Old 01-06-2022, 10:21 AM   #57
FLAMESRULE
First Line Centre
 
FLAMESRULE's Avatar
 
Join Date: Oct 2001
Location: The centre of everything
Exp:
Default

Quote:
Originally Posted by You Need a Thneed View Post
Approximately 6 months until we see real data coming back.

It has to cool down, which takes several months, and then after that, they have to align and calibrate everything.
Does it really take months to cool down? Seems like a really long time considering the on board helium cooling system, heat shield, and temp of deep space. Is the solar radiation that high that the cooling rate is pretty small? Love to see any links you might have (I'll google obvs).
FLAMESRULE is offline   Reply With Quote
Old 01-06-2022, 10:28 AM   #58
You Need a Thneed
Voted for Kodos
 
You Need a Thneed's Avatar
 
Join Date: Dec 2007
Exp:
Default

Quote:
Originally Posted by FLAMESRULE View Post
Does it really take months to cool down? Seems like a really long time considering the on board helium cooling system, heat shield, and temp of deep space. Is the solar radiation that high that the cooling rate is pretty small? Love to see any links you might have (I'll google obvs).
The hot side of the telescope is going to stay hotter than air temperature here on earth.

And it’s really quite hard to cool things off in space, since there’s nothing to conduct or convect heat to. Sone parts of the telescope have to be REALLY cold (7K or so).
__________________
My LinkedIn Profile.
You Need a Thneed is offline   Reply With Quote
Old 01-06-2022, 10:38 AM   #59
You Need a Thneed
Voted for Kodos
 
You Need a Thneed's Avatar
 
Join Date: Dec 2007
Exp:
Default

Looks like it’s going to pass 1,000,000 km from earth in the next couple minutes.
__________________
My LinkedIn Profile.
You Need a Thneed is offline   Reply With Quote
Old 01-06-2022, 10:47 AM   #60
FlamesAddiction
Franchise Player
 
FlamesAddiction's Avatar
 
Join Date: Oct 2001
Location: Vancouver
Exp:
Default

About to hit 1,000,000 km!
__________________
"A pessimist thinks things can't get any worse. An optimist knows they can."
FlamesAddiction is online now   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 02:05 PM.

Calgary Flames
2023-24




Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright Calgarypuck 2021