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Originally Posted by Kullat Nunu
And what's more, our sample is highly biased to massive closely-orbiting planets. We could already discover true extrasolar Jupiter analogs (and we probably have), but discovering one requires data points along the complete orbit, that is over 10 years.
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Why would you need data points along the complete orbit? For example, 2M1207b (the first extrasolar planet directly imaged by a telescope) is roughly Jupiter massed, and separated by 46 AU from 2M1207 giving it an oribital period of ~2,400 years. Obviously we haven't watched it that long.
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An extrasolar Saturn analog would be much harder to find, and other planets would be currently impossible to detect.
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Plenty of Neptune-sized planets have been found, and
here's one that's only 5 Earth masses.