Voyager Spacecraft Hardware |
Voyager Spacecraft Hardware |
Guest_PhilCo126_* |
Jan 3 2006, 06:37 PM
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#1
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Guests |
Some questions on the basic hardware of the Voyager spacecraft:
1. From which material was the decahedral space bus made ( Aluminium ? ) 2. Exact weight of the spacecraft - literature gives numbers between 792 and 825 kilograms ? Some additional questions: 1. The Deep Space Network of worldwide antenna sites wasn't sufficient to collect the faint signal of the distant spacecraft once beyond Saturn ... I know that the twenty-seven 25-meter steerable radio antennes of the Very Large Array in New Mexico were linked with DSN ... when was this done exactly? ( 1989 Neptune encounter only ? ) 2. What is the actual telecommunications time-lag 1-way to Earth (after having passed the bow-shock ) |
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Dec 1 2008, 10:56 PM
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#2
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Junior Member Group: Members Posts: 63 Joined: 18-November 08 Member No.: 4490 |
Thanks for that - so the DTR can hold 8 tracks, 12 images per track. I wonder if thats with compression, or uncompressed? If uncompressed, well each image is 256 x 256 x 8 bits (256 grey scale) = 64K. 8 x 12 x 64 = 6144k, or 6 megabytes at a guess. That means next time you go out and take a picture with your new camera, just 1 picture at a high resolution is equal to all the data storage Voyager 2 had available during its Jupiter/Saturn/Uranus/Neptune flyby! Now as I said, they did implement better compression for the Uranus/Neptune flybys - I have to assume simple run-length compression for those old 1802's. If you look at the raw Cassini images, you will see a "comb" like effect - run length compression is applied to scan lines in pairs, but at the point where it fills up available space, the alternate vertical pixel is dropped. Is the same compression applied to Uranian/Neptunian images? Are there "Raw" images anywhere?
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