PDA

View Full Version : New "Stellar Mapping" site - lots of near Sol star data now available!



EDG
2012-Feb-01, 09:32 AM
Hopefully it's OK for me to post this here, but I figure it'd be of interest to people on this board.

I've been recently asking here about Searchable Star Catalogues (http://www.bautforum.com/showthread.php/127230-Searchable-Star-catalogues), and now the project I was working on is complete - I've been working on overhauling my "Realistic Astrography near Sol" webpage.

You can find the new "Stellar Mapping" page at: http://evildrganymede.net/rpgs/stellar-mapping/

This is a complete rewrite of my previous "Realistic Astrography" page, and includes Equatorial to Galactic co-ordinate conversion files (thanks to the folks here who helped out with that many moons ago!), as well as accurate Galactic Coordinates for the stars in the complete RECONS (2012) and DENSE star lists, and all the stars from the (new reduction) Hipparcos, Gliese 3, and Yale catalogues out to 300ly from Sol! It also includes a "Further Stars" list gleaned from the stars described at Solstation.com, with locations determined by Hipparcos.

The data is presented in generic CSV (in Galactic co-ordinates for general use) and also in a format that can be imported into NBOS' excellent Astrosynthesis (http://www.nbos.com/products/astro/astro.htm) visualisation program - I'll be discussing the data more in blog articles in the coming weeks.

These maps and data will be useful for any sci-fi endeavour, or for anyone interested in finding out where the stars near Sol are!

antoniseb
2012-Feb-01, 12:20 PM
Hopefully it's OK for me to post this here...
We look out for spam, efforts to sell things, and other self-promotion. Personally, while I can see the connection between this and those things, I don't think it crosses the threshold ... and seems genuinely useful. Thanks.

Swift
2012-Feb-01, 02:04 PM
Cool. Nice work EDG

eburacum45
2012-Feb-02, 10:51 PM
Wow!
What's the difference between Galactic XYZ and Astrosynthesis XYZ?

EDG
2012-Feb-02, 11:20 PM
Thanks, folks :)

Astrosynthesis XYZ uses a different XYZ orientation to Galactic:

Galactic +X is Coreward (towards galactic longitude 0), Galactic +Y is Spinward (towards gal lon 90) and Galactic +Z is "up" towards Galactic North.
AS +X is Trailing (directly opposite the direction of galactic rotation, towards gal lon 270), AS +Y is "up" towards Galactic North, and AS +Z is Rimward (towards gal lon 180)

You have to multiply the Galactic X and Y values by -1 to turn them into AS Z and AS X respectively (and Galactic Z turns directly into AS Y).

eburacum45
2012-Feb-03, 09:17 PM
Thanks.
I'm torn between getting this software and modding something up myself. What would be nice would be a program that sliced space up into cubes, so you could look at each cube in isolation.
Incidentally the Internet Stellar Database has values for all its stars in galactic xyz, which is useful.
http://www.stellar-database.com/

EDG
2012-Feb-04, 10:29 AM
I'm not sure how up to date the ISDB is though. It doesn't seem to use New Reduction of Hipparcos, and the Sirius entry at least hadn't been updated to RECONS data yet (in fact, it was last updated in 2001).

You can make (cubic or spherical) sectors in Astrosynthesis, which I think is what you're after?

EDG
2012-Feb-04, 11:57 PM
http://evildrganymede.net/2012/02/04/make-your-own-stellar-database/

I've posted a new article that will possibly be of more interest to people here - I describe how to use the VizieR database to make your own stellar database with Galactic XYZ co-ordinates (and how to import it into
Astrosynthesis too)! The example provided is a corridor between Sol and the Pleiades (2300AD RPG fans will recognise this as the Bayern corridor!). I've also added this dataset to the Stellar Mapping (http://evildrganymede.net/rpgs/stellar-mapping/) page!

EDG
2012-Feb-05, 09:26 AM
ARGH! I forgot a star! Gliese 667 slipped through the cracks (which is slightly embarrassing since it's a bit famous for having planets around it...). It was within 22.8 ly from Sol, but not on the RECONS list and because it was so close it wasn't on the HIP list either. I've now added it to the RECONS CSV files! (I only found it because I was checking the stars on the American Arm for 2300AD!). I think that's the only one that's missing, I did a check for HIP stars closer than 22.8 lightyears and didn't find any more...

You'll want to re-download the RECONS files so you can include that star in the data too!

7th Feb EDIT: Xi Ursae Majoris was left out too (for a different reasons), but is now back in the HIP database. Again, you'll have to download the Hipparcos dataset again from the Stellar Mapping page to include it.

I've added an "Updates" section to the Stellar Mapping page so keep people informed if I find any more missing stars (and so I don't keep spamming boards with these updates!), so check back on the page every now and then for any more updates!

EDG
2012-Feb-27, 01:15 PM
I've now added 164 stars from the CTIOPI dataset (available on the RECONS website), and also updated the DENSE data. See http://evildrganymede.net/2012/02/27/stellar-mapping-ctiopi-added/ for details.

http://evildrganymede.net/wp-content/uploads/2012/02/CTIOPI-300x290.png (http://evildrganymede.net/2012/02/27/stellar-mapping-ctiopi-added/)

If you've downloaded the datasets previously, you'll need to download the updated versions rom the Stellar Mapping page (http://evildrganymede.net/rpgs/stellar-mapping/)!

publiusr
2012-Feb-27, 10:34 PM
So how would the star from here show up? http://www.bautforum.com/showthread.php/20128-DM-61-366

I'm a computer illiterate outside of surfing--so a simulation of how this star will approach us might be startling.

EDG
2012-Feb-27, 11:37 PM
My data doesn't include proper motion (the original source data does though).

However, all I can find is BD+61 366 (part of the DM catalogue), which is actually HIP 9481 or Gliese 83.3, and is located around 900 lightyears away (parallax is 3.6 milliarcseconds). So its sounds like any "approach" is a false alarm (at that distance, it's very unlikely to be a mere K5 V star, it's probably a red giant).

http://simbad.u-strasbg.fr/simbad/sim-id?Ident=DM%2B61+366&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id

publiusr
2012-Mar-03, 07:26 PM
The only reason I asked is that it was said to pass withing .29 of one light year in a bout 800,000 years, and was thought to plow into the Oort. It seems farther away, but there has been mistakes on distance in the past...

eburacum45
2012-Mar-05, 08:36 PM
That star has been mentioned on this forum before. Most sources place it as a close star, but not Hipparchos. It may be a binary of some sort, or perhaps the high proper motion has affected the parallax.

dtilque
2012-Mar-08, 07:59 AM
My data doesn't include proper motion (the original source data does though).

However, all I can find is BD+61 366 (part of the DM catalogue), which is actually HIP 9481 or Gliese 83.3, and is located around 900 lightyears away (parallax is 3.6 milliarcseconds). So its sounds like any "approach" is a false alarm (at that distance, it's very unlikely to be a mere K5 V star, it's probably a red giant).

I suspect that someone made a mistake in that old thread and the star they meant to refer to is Gliese 710 (http://en.wikipedia.org/wiki/Gliese_710)

EDG
2012-Mar-12, 10:13 AM
I've now replaced the New Reduction Hipparcos data with the brand new Extended Hipparcos dataset, so if you downloaded that previously then please head back (http://evildrganymede.net/rpgs/stellar-mapping/) and download the new data! Also, my stellar mapping site now proudly bears the Atomic Rockets Seal of Approval! :)

See http://evildrganymede.net/2012/03/12/stellar-mapping-extended-hipparcos-dataset-added/ for details!

publiusr
2012-Mar-16, 10:39 PM
Gilese 710...they are calling it to hit the Oort cloud in 1.4 million years, but the old Starflight Handbook pegged a close approach as being in 'only' 800,000 years or so for DM 61 366. I wonder...

EDG
2012-Mar-25, 09:13 AM
I’ve now added a new Brown Dwarf dataset to the Stellar Mapping page - this is the IPAC LDwarf catalogue from http://DwarfArchives.org! This should hopefully be the last major update to the stellar datasets for a while.

http://evildrganymede.net/wp-content/uploads/2012/03/LDwarf-300x245.png (http://evildrganymede.net/2012/03/25/stellar-mapping-brown-dwarf/)

I've also made some major updates to the other datasets on the Stellar Mapping (http://evildrganymede.net/rpgs/stellar-mapping/) page, so if you're using them then you'll want to download the new versions!

See http://evildrganymede.net/2012/03/25/stellar-mapping-brown-dwarf/ for more details!

lpetrich
2012-Mar-31, 06:30 PM
I've been searching for some catalog data on stellar positions and velocities. I've been able to find directions, parallaxes, and proper motions, but not radial velocities. Is there any catalog of nearby or bright stars that contains radial velocities?

EDG
2012-Mar-31, 10:50 PM
Not that I saw, I think all the ones listed on my site had proper motions if they had that kind of data (you'd find those in the original data, which you can get from the sources listed. The files you can download from my site only contain the XYZ coordinates and spectral types).

lpetrich
2012-Apr-01, 06:55 AM
I was interested in working out what the sky looks like at other times, like over the last few million years. That's what I wanted radial velocities for.

EDG
2012-Apr-01, 10:02 AM
Ah, sorry. Can't help you on that one. I think that some of the commercial astronomy programs (Starry Night?) might be able to show you that though (do they take into account the sun's own path around the galactic core though?)

eburacum45
2012-Apr-06, 10:11 AM
Astronexus Distant Worlds Star Mapper (on-line) shows the effects of proper motion on the sky as seen from Earth (and other stars)
http://www.astronexus.com/node/69
(drop down the 'chart settings' tab to adjust date and location)