I'm using this one: http://uranometria.blogspot.com/p/ne...catalogue.html
Was the most convenient I found. I have a sneaking suspicion that this is not the most accurate but it works I guess.
It is a nice set of data (and machine readable too). You translated the polar coordinates to Cartesian coordinates and then calculated relative distances, right? I hope you automated at least that...
I wrote a quick AWK script for the conversion of the coordinates, and for reformatting the list - I don't need a bunch of different catalogue IDs for example.
I then imported the result into openOffice, sorted it by distance from Sol in ascending order, and am working my way down the list manually. For a bunch of stars the spectral class is missing in this list, and sometimes it is not easy to find them. (SINBAD is awesome though I didn't know it when I started this map!) I am also adding popular names for stars as I notice them, I will probably revisit this when I work out the exploration of space and have to give names to stars and colonies anyway.
After placing a new star, I "manually" (OpenOfifce does the calculation but I have to copy and paste the coordinates into a 2nd worksheet) check the distance to stars that are likely to fall within 7.7 light years. I am pretty good at that, but sometimes I overlook a star that should be connected.
I did a bunch more stars yesterday but I still didn't connect the two big clusters. There are some nice, long routes on the fringes of the cluster that the Earth is connected to, though, and I am almost hoping that I will NOT be able to connect Earth beyond the 25 parsec sphere I am working on since this will give me a nice sandbox with defined borders. And I can always fudge access to the rest of the galaxy - a jumpgate built by The Ancients(tm) that defies the known rules of FTL travel and sends ships to a destination 100s of light years away - Into a region of space so uncharted by our primitive 21st Century technology that I can just randomize it.
I think I have good news for you. I have written a c++ program to harvest that data and it found a 52-jump connection from Altair to Sol. If you are interested I will send you the source code.
[Edit] Mu Herculis and Gliese 3959 are only 4.65 ly apart, add that connection and travel to Altair. And my program needs a slight adaption for routing, traveling EVERY star in a multi system is not efficient...[/Edit]
Last edited by cfds; 05-03-2011 at 11:43 AM.
Thanks but - Are you sure?
If my conversions are right - and, boy, they better be or I wasted a LOT of time on this, then:
Mu Herculis is at x,y,z = 15,0527 19,5839 11,8455
Gliese 3959 is at x,y,z = 6,49408 13,7845 14,313
Distance = 10.62880863
As for the source, sure, why not. I have some Linux systems I could run it on.
I found a 7.44ly link between Vega and HIP 83945A/B though!
Interestingly it puts Earth more or less in the middle of two "arms":
the stellar database can do distances very conveniently. Their results do not always agree with mine but I put that down to normal margin of error. Anyway:
7.7 ly of Mu Herculis:
Bonner Durchmusterung +18°3421: 4.47559 light-years, class M0 V
Gliese & Jahreiss 1230: 6.4155 light-years, class M4.5 V
I also have Vega in addition to those two. My distances are: GJ1230=5.98, BDetc aka GJ686=4.49ly