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Oct 25, 2018 at 16:43 vote accept uhoh
Jul 30, 2018 at 23:35 comment added Organic Marble That's what the source document calls it, but I think it's an early design model. The flight models seem to be "spheres with a cylinder attached" like Vanguard 3. I notice quite a few subtle differences between the model in the question and the one in the answer.
Jul 30, 2018 at 23:29 comment added uhoh Thanks, I will dig into this after coffee. I'm guessing IGY is International Geophysical Year where nailing the Earth's oblateness through orbital tracking was one of the major goals, and the Fischer Ellipsoid of 1960 was a result, but I'll start to read up on the importance of magnetometers as well. To double check, this i.sstatic.net/pKSwx.jpg is an "IGY magnetometer satellite"?
Jul 30, 2018 at 19:44 history edited Organic Marble CC BY-SA 4.0
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Jul 30, 2018 at 19:33 history edited Organic Marble CC BY-SA 4.0
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Jul 30, 2018 at 19:25 history edited Organic Marble CC BY-SA 4.0
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Jul 30, 2018 at 19:15 history answered Organic Marble CC BY-SA 4.0