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The Distant Worlds Star Mapper can now use the Tycho-2 catalog for many of its charts. Prepared from the same mission that created the Hipparcos catalog, the Tycho-2 catalog has almost 20 times as many stars as the Hipparcos catalog -- over 2.5 million, including 99% of all stars to magnitude +11, and 90% to magnitude +11.5. Since the core of the Mapper's database was originally the Hipparcos catalog, there is clearly a huge difference. Here are some examples:
M6 + M7, old catalog (to about magnitude +8.5 with occasional fainter stars):
M6 + M7, Tycho-2 version (here limited to magnitude 10, so this is still only a fraction of the stars it can show):
Additional samples after the break.
Beehive (M44), old catalog:
Beehive (M44), Tycho-2:
M35, old catalog:
M35, Tycho-2:
Be aware that with 20x as many stars, there are a few tradeoffs. In particular:
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