What are the conditions like in Mercury orbit?

In Mercury's orbit around the Sun (Solar orbit, not Mercurial orbit), what are the conditions like? What shielding or heat management would be required for a manned spacecraft? Could a spacesuited astronaut survive a space walk?

Basic research on NASA's site gives me plenty of information about Mercury proper which is hot in the sunlight. :) NASA's MESSENGER mission site specifies some of the countermeasures that the MESSENGER orbiter uses. The ever-helpful Atomic Rockets site also has some helpful information about Mercury itself and heat radiators.

Mercurial orbit also has to contend with reflected thermal radiation from Mercury's surface, but I'm specifically interested in Solar orbit (e.g. Sol-Mercury L4 or L5), where the only problem is Solar radiation.

However, I have been able to find nothing specific about the concerns of human habitation Mercury's distance from the sun. Hence this question!

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What are the conditions like in Mercury orbit?

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