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Voyager-1 at 100 AU!, A space milestone this month
which milestone is more important?
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dilo
post Aug 2 2006, 12:51 PM
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Nobody highlighted this and I didn't find any comment from Nasa/Voyager sites.
On August,11 the intrepid Voyager-1 probe will reach 14.960 billion Km from the Sun, one hundred times the average Earth-Sun distance!
This event will be followed, after 16 days, by the 100AU from Earth reach.
From astrophysical standpoint, first event is the most important but, I think, most people will be emotionally hit from the second one.
So I would like to start a poll on this.


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David
post Aug 2 2006, 01:29 PM
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QUOTE (dilo @ Aug 2 2006, 12:51 PM) *
This event will be followed, after 16 days, by the 100AU from Earth reach.
From astrophysical standpoint, first event is the most important but, I think, most people will be emotionally hit from the second one.


Obviously, we need to celebrate continuously from August 11 to August 27. biggrin.gif
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RNeuhaus
post Aug 2 2006, 02:32 PM
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I would rather prefer AU as the reference from Sun. The Earth is no longer as the center of the world which were tought in the older times....

Rodolfo
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dilo
post Aug 2 2006, 02:34 PM
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QUOTE (David @ Aug 2 2006, 01:29 PM) *
Obviously, we need to celebrate continuously from August 11 to August 27. biggrin.gif

Not a bad idea! biggrin.gif
I must apologize on a little error in my first post. The 100AU from Earth event will occour on Aug,26 - not 27.
I'm using NASA space simulator (what about other sources?)


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MizarKey
post Aug 2 2006, 03:35 PM
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QUOTE (RNeuhaus @ Aug 2 2006, 07:32 AM) *
I would rather prefer AU as the reference from Sun. The Earth is no longer as the center of the world which were tought in the older times....

Rodolfo


While that may be true, it is still the 'point of origin' for the craft...didn't leave the sun to go on a journey...


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climber
post Aug 2 2006, 07:20 PM
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Dilo,

I understand you use Nasa space calculator but, does the difference goes as 100-1 for Earth distance or do you consider the EXACT position of Earth on August 25th? You know, the difference could be + or - 1 UA depending where's the Earth on its orbit. By the way, August 25th is prety close to celebrate the 17th anniversary of Voyager II fly-by of Neptune.
By the way, if you open up a pool like arrival of Oppy at VC or Eagle, my bets are 100 UA from SUN first biggrin.gif biggrin.gif biggrin.gif
Can you tell us when the round trip signal will need 24 hours?


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dilo
post Aug 2 2006, 10:01 PM
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Climber, using Nasa space SIMulator is pretty easy to know the exact moment of both events, withut additional calculation... moreover, as you can see from following snapshot, Earth will be going farther from Voyager at this epoch, so no risk of "multiple" 100AU events!
Attached Image

We passed the time for 24hrs signal round trip (go and forth) in Nov 2002; if you are asking about the time when round trip signal will need 24 hours to reach Voyager (173 AU), this should happens at the beginning of 2027 but, unfortunately, at this epoch Voyager will be dead.


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climber
post Aug 3 2006, 11:02 AM
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QUOTE (dilo @ Aug 3 2006, 12:01 AM) *
this should happens at the beginning of 2027 but, unfortunately, at this epoch Voyager will be dead.

Dilo, by then Voyager will already be 50. I thougth they'll expect them to last up to 2025 or may be it was 2015.


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ups
post Aug 3 2006, 11:58 AM
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QUOTE (climber @ Aug 3 2006, 11:02 AM) *

Dilo, by then Voyager will already be 50. I thougth they'll expect them to last up to 2025 or may be it was 2015.


I believe it's 2025-30 but there is no telling -- they may continue to work many years past that point.
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climber
post Aug 3 2006, 01:19 PM
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QUOTE (ups @ Aug 3 2006, 01:58 PM) *
I believe it's 2025-30 but there is no telling -- they may continue to work many years past that point.

wheel.gif wheel.gif wheel.gif wink.gif


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dilo
post Aug 3 2006, 02:28 PM
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http://voyager.jpl.nasa.gov/science/index.html
In about 10 years from now they will start to share power between instruments (now we are around 290W output, like Spirit at Gusev!). Let's hope ups is right (name seems appropriate!) wink.gif


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Jeff7
post Aug 3 2006, 06:46 PM
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QUOTE (MizarKey @ Aug 2 2006, 11:35 AM) *
While that may be true, it is still the 'point of origin' for the craft...didn't leave the sun to go on a journey...


Celebrate when it gets 100AU from the point where Earth was when Voyager was launched. tongue.gif
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mars loon
post Aug 3 2006, 06:48 PM
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without a doubt, celebrate 100 AU from the sun
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paxdan
post Aug 3 2006, 09:50 PM
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QUOTE (mars loon @ Aug 3 2006, 07:48 PM) *
without a doubt, celebrate 100 AU from the sun

Thirded, there comes a point where the meaningful measurement uses the system star as the reference point. If any thing deserves this, it is most certainly Voyager: our most distant physical ambassador.
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ljk4-1
post Aug 4 2006, 04:28 PM
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When the Pioneers and Voyagers are 100 light years from Sol, then we'll talk celebration.

wink.gif

If they can just track the Voyagers' radio signal after the probes are no longer
able to power any of their science instruments, how many more years will that
last and what science could we gain from it?


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