Subject:
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Re: Local space ACK! Error in distance table!
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Newsgroups:
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lugnet.space
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Date:
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Sat, 27 Nov 1999 06:00:17 GMT
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Viewed:
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936 times
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I wrote:
>
> I wrote:
>
> > Tim Courtney wrote:
> >
> > > Yeah. I'd just need maps of the Sol system, Alpha Centauri, and
> > > Barnard's Star...
> > ...the next three (known) stars out from Earth are two more dim red
> > dwarf stars, known as Wolf 359 and Lalande 21185; and then, the
> > brightest star in our sky, Sirius.
>
> Hey, look what I happened to find in my archive of downloads -- a 3D
> map of exactly these stars!
>
> http://cmgm.stanford.edu/~jladasky/nearest_stars.jpg
This map is right, however...
> Every road atlas needs a mileage chart, right? 8^) I converted the
> right ascensions, declinations, and parallaxes into XYZ coordinates,
> and computed the following distance table...
>
> http://cmgm.stanford.edu/~jladasky/distance_table.txt
Oops. I went back and plotted the positions of my converted points, and
discovered that they DIDN'T MATCH THE IMAGE that I posted! So I
reviewed my math, and found an error in the formulae I used to convert
polar to rectilinear coordinates.
The URL listed above now has a corrected distance table! SORRY! As a
minor bonus, I gave Proxima Centauri a separate entry, seeing as how
it's around a quarter of a light-year away from alpha Centauri A and B.
--
John J. Ladasky Jr., Ph.D.
Department of Structural Biology
Stanford University Medical Center
Stanford, CA 94305
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Message is in Reply To:
 | | Local space -- here's a real map!
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| (...) Hey, look what I happened to find in my archive of downloads -- a 3D map of exactly these stars! (URL) is actually one double star system, UV Ceti, that MIGHT be closer than Sirius, which is not pictured on this map. Various studies disagree. (...) (25 years ago, 20-Nov-99, to lugnet.space)
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