Answering my own question via the reddit AMA: https://www.reddit.com/r/askscience/comments/4zdkra/askscience_ama_series_we_have_discovered_an/d6uzf24 https://w

Answering my own question via the reddit AMA: https://www.reddit.com/r/askscience/comments/4zdkra/askscience_ama_series_we_have_discovered_an/d6uzf24 https://www.reddit.com/r/askscience/comments/4zdkra/askscien... Says we'd need about 30 milliarcseconds, while, as noted elsewhere, Webb provides 100. Damn!