Venus Express |
Venus Express |
Apr 12 2005, 06:56 PM
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Interplanetary Dumpster Diver Group: Admin Posts: 4405 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
If all goes well, Venus Express will be a major topic for discussion in this forum a year from now. Does anyone know how good the surface coverage will be from VIRTIS and VMC? My understanding is that VIRTIS will obtain low resolution multispectral maps, and that VMC will, in addition to cloud monitoring, have one channel that can see the surface, but I don't know at what resolution or at what quality. It will be nice to have some non-radar images of Venus' surface besides the Venera snapshots and the shadowy images from Earth and Galileo's NIMS.
Ted -------------------- |
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Oct 14 2005, 04:22 AM
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Member Group: Members Posts: 477 Joined: 2-March 05 Member No.: 180 |
QUOTE (um3k @ Oct 13 2005, 10:03 AM) I'm no expert, but I would venture to guess that the cause is the spacecrafts' distances from the sun. I think the part in question was the composition of the batteries - lithium ion vs nickel hydrogen. I know about li-ion, but I don't know a lot about nickel-hydrogen. I think Hubble also uses the latter type. |
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Oct 14 2005, 08:15 AM
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Dublin Correspondent Group: Admin Posts: 1799 Joined: 28-March 05 From: Celbridge, Ireland Member No.: 220 |
QUOTE (Jeff7 @ Oct 14 2005, 05:22 AM) I think the part in question was the composition of the batteries - lithium ion vs nickel hydrogen. I know about li-ion, but I don't know a lot about nickel-hydrogen. I think Hubble also uses the latter type. Li-Ion has better power density but the varous Nickel Hydrogen designs, like the NimH used on some laptops and other consumer electronics kit, has much better charge cycle lifetime. Li-Ion is generally good for up to 1000 charge cycles while there are Ni H designs that are spec'ed out for 30000. NimH batteries also have the benefit of being able to be re-conditioned however I don't know if the process is suitable for use "in flight" with the pressurised NiH type batteries used on spacecraft. Li-Ion degradation is more or less permanent. There are many other considerations though so the cycling capability is only one possible reason. |
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