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Moving Hubble to 51.6 degrees (near ISS)
"Jorge R. Frank" wrote in message ...
(Zoltan Szakaly) wrote in m: I worked out the numbers: Assuming an ion engine with a thrust of 1 N (about a 5th of a pound) it would take about a year to move the Hubble and the propellant mass would be about 40kg. The electrical power used would be 100kW Hubble's solar panels provide about 5.27 kW. 100 kW is more electrical power than ISS has at Assembly Complete. That's a lot of solar arrays. I understand. The propulsion package would have to dock with the Hubble and it would have to use less power. For example you could lower the Isp and this would lower the power useage. For example you could go for 400 kg of propellant instead of 40 kg and use only 10kW of electricity instead of 100kw. There is an optimum somewhere which results in minimum mission cost. From a practical point of view we should schedule one more Hubble mission which attaches at least two new solid state gyros to ensure continued operation and perhaps a propulsion package. Since this would not be a large mass to carry to orbit it could be combined with a space station mission perhaps. Zoltan |
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Moving Hubble to 51.6 degrees (near ISS)
Electrodynamic tether? Boing and Lockmart have been studying adding these to
satellites to use as de-orbiting devices at the end of their useful life. A suitably long tether can not only lower Hubble's orbit, but generate power for an ion engine to slowly evolve a new orbital plane over time, then maintain it until serviceing is possible. |
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Moving Hubble to 51.6 degrees (near ISS)
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#14
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Moving Hubble to 51.6 degrees (near ISS)
In article ,
Zoltan Szakaly wrote: Since the hubble is already in orbit, you could easily move it with a solar powered electric propulsion package, having an Isp of 100,000 or something. Except there are no Isp=100,000 electric thrusters. Try 5,000 or so. -- MOST launched 30 June; science observations running | Henry Spencer since Oct; first surprises seen; papers pending. | |
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Moving Hubble to 51.6 degrees (near ISS)
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Moving Hubble to 51.6 degrees (near ISS)
"Remy Villeneuve" wrote in message om... "Jorge R. Frank" wrote in message ... (Zoltan Szakaly) wrote in m: I worked out the numbers: Assuming an ion engine with a thrust of 1 N (about a 5th of a pound) it would take about a year to move the Hubble and the propellant mass would be about 40kg. The electrical power used would be 100kW Hubble's solar panels provide about 5.27 kW. 100 kW is more electrical power than ISS has at Assembly Complete. That's a lot of solar arrays. Then let's move ISS to Hubble! Just kidding ;-P Hey, in some ways it might be a better idea. :-) But I wouldn't mind if ISS went to more launch-friendly latitudes... If only russia could launch Soyuz from French Guyana... |
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