Friday, July 29, 2011

One blog to rule them all

have rather a lot of projects.  To try to keep them all moving (although this one is still breezing along, although invisibly as I program stuff) I am starting (and blogging, I'm hooked) a central plan here.

Sunday, July 24, 2011

Back from vacation

Northern Virginia is a lovely place, but back to the stars.  I am resuming work on the interpolation object.  It will let me interpolate basic star data (remember the datum we need most is mass) from the Spectral and luminosity classes, and also interpolate spectral type from data like color index and luminosity.  And give any "made up" data a shot of verisimilitude.

The initial HYG dataset contains 111168 apparently single stars; of these I have complete spectral and luminosity data for 54611.  This is going to be a slog!

Thursday, July 7, 2011

A bit of a break

It's time for a bit of a vacation, which will be spent in sites more related to the ACW than far future wars.  In the meantime, software progress has been good.  I am working on writing as generic as possible an interpolator for star data.

Monday, July 4, 2011

More database progress

I've found a repository of multiple star catalogs


This includes catalogs of visual binaries which are going to quite close; and other fun stuff besides.  I am making good progress on techniques for working with the Hyg database initial load to track change and to get close to complete for as many stars as possible.  My next step with that data will be to nail as much as I can for the solitary objects, then see how I can integrate this binary data.

I've also been looking at how easy to parse the Bayer/Flamsteed name is.  If you look at some samples, it is just:
25    Psc
7Rho Cas
26    Psc
Gam2Oct
Eta Tuc
84Psi Peg

<0,1,or 2 digits of Flamsteed's Number><3 character abbreviated Greek letter name, left justified, may be spaces><1 digit distinguishing number, may be space><3 character abbreviated constellation name>.


I was thinking of parsing these out, but why bother?  You can search using like and get the right results, and the real fun is having that nifty Greek glyph output on a map.

Friday, July 1, 2011

Dog stars

Part of the fun working with data is discovering the "odd bits"

One of the odd bits in this database is Sirius.  We all know that Sirius is a binary, right?  However, the Hyg dataset lists it as A0m... -- and no, there is no distinct entry for its white dwarf companion.  I'm going to assume that "..." stands for an "n-ary" system and process accordingly.  Might as well assume the same for ".."

Also, I will have to list all the "famous stars" when I am done and double check (and patch) the results.  I am not too worried about the great mass of stars I might as well nail down the easy ones.