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Message: <blockquote data-quote="tarchon" data-source="post: 2484196" data-attributes="member: 5990">It looks like if you had a 1000 K brown dwarf (not much more than a red glow), with a diameter about 1/10 the sun's, you could sustain decent surface temperatures with a 400,000 km orbit, which would be roughly the same distance as Io from Jupiter. More than likely, Jupiter itself could have met these conditions for a brief period in its early history, which is why Io is largely depleted of volatiles now. It would be kind of a transient condition, but you could maybe get a million years or so of decent weather.There's a calculator (<a href="http://zenith.as.arizona.edu/~burrows/evolution3.html)if" target="_blank">http://zenith.as.arizona.edu/~burrows/evolution3.html)if</a> you want to punch some numbers for temperature. Anything much over 1000K will tend to put out decent amounts of visible light, and even a 1000 K source at that irradiance level is going to be comparable to interior lighting, albeit very reddish.</blockquote>