[cosgroveb]

I probably did the calculations[1] wrong but the value I'm getting for the apparent magnitude of 55 Cancri B at 1000 AU with an absolute magnitude of 12.66[2] is about -3.9121 which, if located in our Solar system, would be bright enough to see in daylight, despite being almost 35 times as distant as Pluto is to the Sun.

[1] http://ceres.hsc.edu/homepages/classes/astronomy/spring99/Ma... [2] http://en.wikipedia.org/wiki/55_Cancri

[iwwr]

Still, it won't look like 'two suns in the sky', but more like Venus.

[cosgroveb]

Definitely. It would look like a pretty damn bright star, but not like a second Sun.