Jonathan wrote:
"In the 1970-1972 frame, both Zond and Luna probes used the
11S824 Blok D upper stage which is 5.5 meters long and 3.7m diameter,
compared to an S-IVB which is 18.7m long and 6.6m dia."
In other words, the boosters of these Russian probes are too
small to be a photometric match to the 2000 SG344 brightness.
Indeed, they are smaller than the Apollo SLA panels (when the
latter are oriented for maximum projected area) which themselves
are too small to match SG344.
I don't believe there are any other manmade candidates that:
1. were launched in 1971 or earlier
2. have a projected area greater than 80 square meters
3. did not impact the moon or re-enter earth's atmosphere
4. are expected to be in heliocentric orbit or could have
been perturbed into heliocentric orbit in 1971
Cheers,
Rob
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