Re: [nbos] [AS] Names, not just numbers.
Sam Orton
Tue Oct 2nd, 2007


Mike Oliver <mike-oliver-at-blueyonder.co.uk> wrote:

v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Clean Clean DocumentEmail /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} Hi Sam:

I’m doing something similar although my project is simply re-naming stars by their constellation designations with letters of the Greek alphabet and/or Flamsteed numbers or Bayer letters. It was instigated by my looking at an old RPG called Traveller 2300 and I decided to try to identify all the stars in the T2300 listing. It’s proving a lengthy process because I can’t find the time to work on it at present but I’ll persevere.

That's most of what I'm doing, although I'm going by existence of a Bayer/Flamsteed designator than any particular game setting.


Are you determining “navigation stars” by their absolute magnitude, detailed spectral classification or what? Obviously, very bright stars as seen from Earth may well not be very bright when seen from a location several hundred light years from Earth, unless they have bright absolute magnitudes.

That's what I'm working on now, trying to find a workable formula for that. I'm looking into both. Bluer light scatters much faster in atmosphere, are there any optics experts handy who know how scattering by frequency works in vacuum?
I'm using absolute magnitude and spectral class both as guides, but when it comes right down to it the problem has very little to do with astronomy, it's an aesthetics and clarity issue in 3D cartography. If too many stars are labeled in the display, it will be too busy and confusing to be useful. Too few, and it won't tell you enough to be useful. Those are gonna be the issues regardless of how accurate or inaccurate the display distances are. So yeah, I want spectral class (A0-M9 and 0-VI) and absolute magnitude as *guides*... but not as rules.


Not all the stars in the “within 1000 light years” listing are identified by their Henry Draper catalogue numbers – some use other catalogue ID’s. Also, you may well find a few duplications (I did) and beware of Wikipedia data; because it can be altered by contributors, mistakes often occur. You’re better off using something like http://www.solstation.com/ or http://simbad.u-strasbg.fr/simbad/.

I've noticed. But between HDs, HIPs, BDs, CoDs, CPDs... That catches most of it. I have to hunt for the Glieses and Lalandes and etc, but most of those are comparatively close. And yeah, I've found a few duplicates. But keep in mind, I'm only taking about going through perhaps 2000 or so of the 77,000+ bodies in the Kepner data. Most of the rest of them don't *have* names, only listings in one or another catalog. For game purposes, I'll probably use an address system of sorts for known systems, mostly things fairly close in. For example, give a system 104.2ly out from Sol in the direction of Sagitta the designation SO1042 Sagittae. The SO is to say it's my modification, you have to look at my notes to correlate it with other catalogs, and distance and direction from Sol. That was picked out of the air, I have no idea whether or not there's a system there, but you see the point. That will at least make known systems helpful in finding one's way around.
As for sources, I'm using as many as I can find. Wikipedia is often a starting point because it links to so many things. But yes, that's a two edged sword. It links to both true and false. Sol Station has definitely been my friend, but hunting is hard for anything they don't cover. I checked the other link you gave me... wow. Thank you. Although I gotta admit, I think I may be a little while learning my way around in it.



There is an excellent astronomical programme called Cartes du Ciel which you can download from http://www.stargazing.net/astropc/index.html, together with a whole raft of astronomical catalogues – I found it invaluable when I did my Star Trek universe map.



Hmmm... again, amazing amounts of information, thank you. Does this program 'see' in 3 dimensions at all, or is it all Terran surface orientation?

Sam



"I do not feel obliged to believe that the same God who endowed us with sense, reason and intellect intended us to forego their use." - Galileo Galilei

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