### Author Topic: Mapping the Milky Way  (Read 756 times)

#### PabloMack

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##### Mapping the Milky Way
« on: June 09, 2017, 09:26:06 PM »
I had this idea about downloading a 3D model (greatly simplified) of the Milky Way. I didn't find one but I ran across an interesting project by the ESA. The Gaia probe (launched in 2013) is collecting high precision data on the stars of our neighborhood. Before today I didn't know what LaGrange Points were. This video will explain much of what Gaia is all about:

Enjoy...

#### Ethrieltd

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##### Re: Mapping the Milky Way
« Reply #1 on: June 09, 2017, 11:17:45 PM »
I'm just trying to figure out exactly how simplified a 3d model this would have to be..

3333^10 x 100^10 x 350x1^10 = 5.921356118782830346289920164611720715 × 10^57

5.921356118782830346289920164611720715 × 10^57 being the total area of the Milky Way in meters... Roughly...

There are, again roughly 1 x 10^9 "objects" in the Milky Way...

So, divide 1 x 10^9 by 3...

#### Dune

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##### Re: Mapping the Milky Way
« Reply #2 on: June 10, 2017, 06:13:34 AM »
TG can handle a lot, but the whole (simplified) galaxy?
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#### PabloMack

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##### Re: Mapping the Milky Way
« Reply #3 on: June 12, 2017, 08:02:42 PM »
What I wanted initially is just a model of the 100~1000 stars that are closest to our sun. You could do the rest of the galaxy as a spherical photo mapped on the inside of a sphere. The idea is to get a feel for the relative orientations and distances between the nearest stars. I would need a list of names, coordinates, relative size, color and brightness. That should be pretty easy to do.

#### Ethrieltd

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##### Re: Mapping the Milky Way
« Reply #4 on: June 12, 2017, 10:58:05 PM »
What I wanted initially is just a model of the 100~1000 stars that are closest to our sun. You could do the rest of the galaxy as a spherical photo mapped on the inside of a sphere. The idea is to get a feel for the relative orientations and distances between the nearest stars. I would need a list of names, coordinates, relative size, color and brightness. That should be pretty easy to do.

http://tdc-www.harvard.edu/catalogs/sao.html

It has all the positions, motions, magnitudes, etc are all there. It does have about 250,000 stars though so..

#### PabloMack

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##### Re: Mapping the Milky Way
« Reply #5 on: June 18, 2017, 03:42:56 PM »
Interesting. I'll have to write a program to extract the binary data. I was unable to download the Entry description. My browser gave up waiting on the link.

#### N-drju

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##### Re: Mapping the Milky Way
« Reply #6 on: June 19, 2017, 06:28:39 AM »
Or try "Digital Universe" - my favourite sky-surfing program. There are lots of notepad files with binary data there that make no sense to me... But perhaps they will to you.

#### PabloMack

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##### Re: Mapping the Milky Way
« Reply #7 on: June 20, 2017, 01:54:58 AM »
I just now was able to download the Entry Format description so I have both now.

Or try "Digital Universe" - my favourite sky-surfing program. There are lots of notepad files with binary data there that make no sense to me... But perhaps they will to you.[/font][/size]

« Last Edit: June 20, 2017, 01:57:58 AM by PabloMack »

#### N-drju

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##### Re: Mapping the Milky Way
« Reply #8 on: June 20, 2017, 06:02:13 AM »
Sure. Have a look a this: