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#80
by
Jim
on 05 May, 2011 23:31
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I'm surprised it doesn't have an ion engine since it will be over powered until it crosses the asteriod belt.
18kw at 1 au but only 400w at Jupiter.
How would it brake into orbit with the extra energy?
I don't think it works that way. Acceleration would reduce the approach velocity, as outer planets tend to sort of overrun approaching spacecraft . There are mission studies where advanced RTG powered ion engine missions get to the outer gas giants with minimal approach velocity and go into orbit. Jupiter is the target in Figure 6 of
http://sgc.engin.umich.edu/erps/IEPC_1991/IEPC1991-035.pdf
However, the other answer, that there is insufficient electric power, particularly beyond the orbit of Mars, dominates the reason to not consider it.
My point was that there is "excess" energy in the beginning, but the lack of electrical power near Jupiter would negate the use of Ion thrusters for braking.
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#81
by
jacqmans
on 12 May, 2011 20:09
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Spacecraft: Juno
Launch Vehicle: Atlas V 551
Launch Site: Cape Canaveral Air Force Station, Fla.
Launch Pad: Space Launch Complex 41
Launch Date: Aug. 5, 2011
Launch Time: 11:40 a.m. EDT
This week a cruise system verification test was conducted, and a
Jupiter orbit insertion system verification test was also completed.
The work to install the three solar arrays begins May 13. Later in
processing, the magnetometer will be installed; a solar array
illumination test and a magnetometer boom deployment test also are
planned.
The solar-powered Juno spacecraft will orbit Jupiter's poles to find
out more about the gas giant's origins, structure, atmosphere and
magnetosphere.
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#82
by
jacqmans
on 19 May, 2011 21:52
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Spacecraft: Juno
Launch Vehicle: Atlas V 551
Launch Site: Cape Canaveral Air Force Station, Fla.
Launch Pad: Space Launch Complex 41
Launch Date: Aug. 5, 2011
Launch Time: 11:40 a.m. EDT
Solar arrays No. 2 and No. 3 were installed onto the spacecraft May
13. Array No. 3 was deployed on May 16 and a solar array illumination
test was conducted May 17. Later this week, solar array No. 1 will be
attached, the magnetometer will be installed, a solar array
illumination test will be conducted and a magnetometer boom
deployment test is planned.
The Atlas V rocket is scheduled to arrive at Cape Canaveral Air Force
Station next week.
The solar-powered Juno spacecraft will orbit Jupiter's poles 33 times
to find out more about the gas giant's origins, structure, atmosphere
and magnetosphere.
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#83
by
baldusi
on 23 May, 2011 00:06
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I'm sorry if this is the wrong thread. But I will just be in Orlando by launch date and I wonder if there's a way to watch the launch. I just have to buy the normal visit ticket and take the bus to the best available spot? The LC will be closed down? Other way?
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#84
by
jacqmans
on 27 May, 2011 15:32
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Spacecraft: Juno
Launch Vehicle: Atlas V-551
Launch Site: Cape Canaveral Air Force Station, Fla.
Launch Pad: Space Launch Complex 41
Launch Date: Aug. 5, 2011
Launch Time: 11:40 a.m. EDT
Solar array No. 1 with its associated magnetometer boom was installed
May 21. A deployment test was conducted on May 23, and a solar array
illumination test also was performed. On May 24, a magnetometer
functional test was done. The solar arrays now are being stowed for
flight.
The Atlas V booster stage arrived by Antonov cargo aircraft at the
Skid Strip on Cape Canaveral Air Force Station on the afternoon of
May 23. The following morning it was offloaded and transported to the
Atlas Spaceflight Operations Center (ASOC) to begin processing. The
Centaur upper stage arrived on May 25 and also was taken to the ASOC
the next day. Later at the launch pad, the Atlas V-551 configuration
for Juno will have five solid rocket boosters attached.
The solar-powered Juno spacecraft will orbit Jupiter's poles 33 times
to find out more about the gas giant's origins, structure, atmosphere
and magnetosphere.
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#85
by
PahTo
on 27 May, 2011 15:38
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Thanks for all the updates, jacqmans.
Is this the first flight of Atlas V in the 551 config? If not, how many times has this config flown?
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#86
by
Stephan
on 27 May, 2011 15:45
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Is this the first flight of Atlas V in the 551 config? If not, how many times has this config flown?
New Horizons maybe.
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#87
by
00rs250
on 27 May, 2011 15:58
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Is this the first flight of Atlas V in the 551 config? If not, how many times has this config flown?
New Horizons maybe.
This is #2 for a 551. New Horizons is correct. And if it is anything like that launch, if you blink you will probably miss is leaving the pad.
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#88
by
jacqmans
on 03 Jun, 2011 21:01
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Spacecraft: Juno
Launch Vehicle: Atlas V-551 (AV-029)
Launch Site: Cape Canaveral Air Force Station, Fla.
Launch Pad: Space Launch Complex 41
Launch Date: Aug. 5, 2011
Launch Time: 11:39 a.m. EDT
Juno's three solar arrays have been stowed for flight. The spacecraft
is currently powered on for electrical testing.
Since its arrival, the Atlas V booster stage has been undergoing
checkout in the Atlas Spaceflight Operations Center (ASOC) on Cape
Canaveral Air Force Station. It is scheduled to be hoisted into
position on the launcher in the Vertical Integration Facility at
Launch Complex 41 on June 13. The Atlas V-551 configuration for Juno
will have five solid rocket boosters which will be attached starting
June 15. The Centaur upper stage will be brought to the launch pad
the last week of June.
The solar-powered Juno spacecraft will orbit Jupiter's poles 33 times
to find out more about the gas giant's origins, structure, atmosphere
and magnetosphere.
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#89
by
Paper Kosmonaut
on 14 Jun, 2011 22:47
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Hi - new here.
This thread so far was very enlightening and interesting. I have seen a lot of pictures of Juno with all the protective plastic wrappings around the magnetometer and the other parts and I am sure they will be removed before flight, of course. But how about the wrapping over the HGA? Does that stay on?
I am asking partly because I am reworking a paper model of the probe and I want to depict it in flight.
(the original model is to be found here:
http://jleslie48.com/gallery_models_postapollo.html)
With that 551 as a booster, the launch will be spectacular!
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#90
by
Jim
on 15 Jun, 2011 01:42
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Hi - new here.
This thread so far was very enlightening and interesting. I have seen a lot of pictures of Juno with all the protective plastic wrappings around the magnetometer and the other parts and I am sure they will be removed before flight, of course. But how about the wrapping over the HGA? Does that stay on?
I am asking partly because I am reworking a paper model of the probe and I want to depict it in flight.
(the original model is to be found here: http://jleslie48.com/gallery_models_postapollo.html)
With that 551 as a booster, the launch will be spectacular!
No, all that "wrapping" is MLI and will stay on for flight including the HGA
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#91
by
Paper Kosmonaut
on 15 Jun, 2011 07:24
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No, all that "wrapping" is MLI and will stay on for flight including the HGA
The HGA allright, I see. Thanks, Jim. I was wondering about possible signal weakening by covering that dish. but there apparently isn't. Okay, I came here to gain more knowledge.
But that white plastic wrapping with the four red square tape sectors on it which is over the magnetometer in most of the assembly photos will be removed, won't it?
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#92
by
Jim
on 15 Jun, 2011 13:23
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No, all that "wrapping" is MLI and will stay on for flight including the HGA
The HGA allright, I see. Thanks, Jim. I was wondering about possible signal weakening by covering that dish. but there apparently isn't. Okay, I came here to gain more knowledge.
But that white plastic wrapping with the four red square tape sectors on it which is over the magnetometer in most of the assembly photos will be removed, won't it?
which photos?
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#93
by
Paper Kosmonaut
on 15 Jun, 2011 14:41
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#94
by
Jim
on 15 Jun, 2011 15:03
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go to ksc multimedia
klick on or search on Juno and you will see the spacecraft as it is being prepared for launch.
BTW, the magnetometers are on a boom at the end of one of the solar arrays, the covered panel is one of 6 antennas for the microwave radiometer.
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#95
by
Paper Kosmonaut
on 15 Jun, 2011 15:06
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Yeah, sorry, I just realised that myself. *stupid*
I'll go and check out KSC multimedia. Thanks again, Jim.
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#96
by
Jim
on 15 Jun, 2011 15:09
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Yeah, sorry, I just realised that myself. *stupid*
I'll go and check out KSC multimedia. Thanks again, Jim.
No problem, I get to see the spacecraft daily and schedule the photographers.
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#97
by
Prober
on 15 Jun, 2011 16:13
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Yeah, sorry, I just realised that myself. *stupid*
I'll go and check out KSC multimedia. Thanks again, Jim.
No problem, I get to see the spacecraft daily and schedule the photographers.
Your a lucky man Jim to work around all this equipment.
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#98
by
Paper Kosmonaut
on 15 Jun, 2011 20:39
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Got a lot wiser after seeing those pictures. Thanks for the tip, Jim. You have a very enviable job.
As far as I have now seen, the probe seems to have been delivered to Titusville in a relatively "unpacked" state, as it were, and is now for a big part wrapped in MLI. I assume the MWR and other science payloads on the sides of the hexagon remain uncovered. At least that's what I have seen in the video simulations. The big square (to put it indignantly) at this picture, is that the :Gravity Science" part? None of the drawings do discern that quite well because it always seem to be on the sides not shown...
(this might be the wrong thread for these questions...)
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#99
by
Jim
on 15 Jun, 2011 20:47
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That is one of the MWR antennas.
Gravity science has no dedicated instrument