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 Oct 1 awarded Notable Question Mar 28 awarded Popular Question Jun 12 comment How many stars within 5 parsecs? I've updated the script gist. Jun 12 revised How many stars within 5 parsecs? Explain what happens if filtering on quality. Jun 12 revised How many stars within 5 parsecs? Explain what happens if flagged stars are not counted. Jun 12 comment How many stars within 5 parsecs? Also, the Tycho catalog guide, vol. 1 gives the median astrometric precision of all stars as 25 mas or 7 mas for $V_T$ < 9 mag. Jun 12 revised How many stars within 5 parsecs? Explain what happens if I discard negative parallaxes. Jun 12 comment How many stars within 5 parsecs? That's weird, but OK. So, I should just outright discard negative parallaxes? (I took the absolute value.) What about the "missing" stars in the Hipparcos catalog? Jun 11 comment How many stars within 5 parsecs? I don't know, but to double-triple-super-mega-check, I've taken those records apart by hand. Negative parallaxes. Jun 11 comment How many stars within 5 parsecs? See cdsarc.u-strasbg.fr/viz-bin/Cat?I/239#sRM2.13 And why couldn't those be parallax values? Also, I initially did use the delimited field approach, but I got the same results. I switched to fixed offsets because it ran faster. Jun 11 revised How many stars within 5 parsecs? Fixed typos. Jun 11 comment How many stars within 5 parsecs? This is the script I used: gist.github.com/2912916 Jun 11 asked How many stars within 5 parsecs? Mar 30 awarded Scholar Mar 30 awarded Supporter Mar 30 awarded Student Mar 30 accepted Amplitude at distance from source Mar 30 awarded Editor Mar 30 revised Amplitude at distance from source replaced \thicksim with \sim Mar 30 comment Amplitude at distance from source So, er, $A^2 \sim \frac{1}{x^2}$ and therefore $A \sim \frac{1}{x}$?