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Answer by Conrad Turner for Absolute/apparent magnitude and distance for...
The absolute magnitude you quote appears to correspond to the Hipparcos parallax distance estimate, which is $\sim 1000 \mbox{ ly}$, not the $\sim 100 \mbox{ ly}$ distance you have used.
View ArticleAbsolute/apparent magnitude and distance for HIP31978 inconsistent?
EDIT: I am still following up, but here's the latest response from Wolfram:Paclet servers are updated and optimized for each version of Mathematica, so I suspect you may be working on an older version...
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