Populating WLM (and other galaxies) with REAL stars

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LukeCEL
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Post #61by LukeCEL » 24.02.2019, 14:18

This add-on almost 1700 stars in the Carina Dwarf Spheroidal Galaxy (Carina dSph).
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carina_dwarf.stc.zip
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Lafuente_Astronomy
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Post #62by Lafuente_Astronomy » 24.02.2019, 15:38

LukeCEL wrote:Okay, I quickly put together some code using data from the Wikipedia article about it:

CODE: SELECT ALL

"MACS J1149 Lensed Star 1"
{
   RA 177.3982917
   Dec 22.3965
   AppMag 29.9 # typical magnitude: was temporarily 28.4 during lensing event
   SpectralType "B"
   Distance 1.44e+10 # comoving distance
}


However, the star won't display because Celestia doesn't show stars that are over 10 million light years away. (See this thread for details.)

Is it possible to increase further the allowable distance for stars to exist in Celestia's Universe to around the mega-parsec range in Celestia 1.7.0? Or at least make a feature that enables stars in galaxies based on the user's current distance (Preferably around 10-100 million light-years) and disables stars beyond the range of the user until the user comes closer to the disabled stars, thus enabling them for the user to see?
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Post #63by LukeCEL » 01.03.2019, 22:49

Lafuente_Astronomy wrote:Is it possible to increase further the allowable distance for stars to exist in Celestia's Universe to around the mega-parsec range in Celestia 1.7.0?

I think it is, but as discussed in this thread, it'll be hard to add more than a single star to a extremely distant galaxy, because the stars need lots of decimal digits of precision.

Lafuente_Astronomy wrote:Or at least make a feature that enables stars in galaxies based on the user's current distance (Preferably around 10-100 million light-years) and disables stars beyond the range of the user until the user comes closer to the disabled stars, thus enabling them for the user to see?

That I don't know, since I'm not a developer. You'll have to ask onetwothree for that.

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Post #64by onetwothree » 02.03.2019, 19:17

Lafuente_Astronomy wrote:Or at least make a feature that enables stars in galaxies based on the user's current distance (Preferably around 10-100 million light-years) and disables stars beyond the range of the user until the user comes closer to the disabled stars, thus enabling them for the user to see?

Not with the current code.

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Post #65by Lafuente_Astronomy » 02.03.2019, 23:37

onetwothree wrote:Not with the current code.

Oh. But if I remember, Art Blos, with the help of Selden is doing something kinda like that: viewtopic.php?f=15&t=18638

Added after 5 minutes 22 seconds:
While it still basic and not complex enough, those are just baby steps, and I'm sure that eventually such a code could allow stars and even galaxies to appear and disappear depending on the user's location, saving some space that would be wasted by generating objects too far away. And perhaps if you want, there could be an option to modify how far would the user like to see objects, from a minimum of 10 million light years to anywhere in the mega parsecs level
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Post #66by onetwothree » 03.03.2019, 08:36

Selden gave a good explanation in that thread why the same approach can't be used with stars and DSOs.

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Post #67by Lafuente_Astronomy » 03.03.2019, 12:17

onetwothree wrote:Selden gave a good explanation in that thread why the same approach can't be used with stars and DSOs.

I may not have understood some of that but at least I got the gist of what he was saying. Actually, I'm thankful that people like you and Selden are keeping Celestia alive and kicking despite having lots of competitors like SpaceEngine, SkySafari, Stellarium, etc. So I say to you. keep up the good work!
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Post #68by Lafuente_Astronomy » 14.03.2019, 06:56

Hello Luke. Are there any new stc files that you've made? Thanks in advance
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Post #69by LukeCEL » 14.03.2019, 21:33

Sorry, I've been quite busy in general and these STC files do take some time, so no, not right now. I suppose the next to do are Leo I, Leo II, and Leo A...

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Post #70by Art Blos » 15.03.2019, 05:17

LukeCEL wrote:I suppose the next to do are Leo I, Leo II, and Leo A...
We wait :biggrin:
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Post #71by Lafuente_Astronomy » 15.03.2019, 06:46

Art Blos wrote:We wait

Hey Art Blos! How's Celestia Origin Version 8 going?
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Post #72by Art Blos » 15.03.2019, 06:53

Lafuente_Astronomy wrote:Hey Art Blos! How's Celestia Origin Version 8 going?
Development is underway. Release as usual, April 30th. :smile:
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Post #73by Lafuente_Astronomy » 15.03.2019, 07:12

Art Blos wrote:Development is underway. Release as usual, April 30th.

Oh I can't wait! Also, since you added the Martian Rovers, are their places gonna be marked in the "Locations" file?
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Post #74by Art Blos » 15.03.2019, 07:20

Lafuente_Astronomy wrote:Also, since you added the Martian Rovers, are their places gonna be marked in the "Locations" file?
Why designate them locations? It is enough turn on the names of the spacecraft and everything will be visible.
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Post #75by Lafuente_Astronomy » 15.03.2019, 08:09

Ahhh. It was just because they are now on the ground and thus, not considered spacecraft. But you're the boss.
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Post #76by SpaceFanatic64 » 18.03.2019, 23:07

STC Code for the brown dwarf 2M1207. I might do the exoplanet soon.

Code: Select all

"2M1207:2M1207A:2MASS J12073346-3932539"
{
     RA 181.8894583
     Dec  -39.5483333
     Distance 172
     SpectralType "M8p"
     AppMag 20.15
     Radius 173875
     InfoURL "https://en.wikipedia.org/wiki/2M1207"
}
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Post #77by LukeCEL » 20.05.2019, 00:08

Hi, I know I'm a bit late, but also very confused. I certainly remember a "Extrasolar, Stars and Exoplanets for Celestia" thread started by gironde. What happened to that thread?

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Post #78by CM1215 » 20.05.2019, 01:39

LukeCEL wrote:Hi, I know I'm a bit late, but also very confused. I certainly remember a "Extrasolar, Stars and Exoplanets for Celestia" thread started by gironde. What happened to that thread?
I believe it was merged into this thread with the "Populating WLM (and other galaxies) with REAL stars" thread.
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Post #79by LukeCEL » 20.05.2019, 03:39

CM1215 wrote:I believe it was merged into this thread with the "Populating WLM (and other galaxies) with REAL stars" thread.

I understand that. But these two threads are completely separate, so why was that one not turned into an announcement by itself? Why the merge?

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Post #80by Lafuente_Astronomy » 20.05.2019, 04:35

The merge was because I am currently merging some of the previous addons threads about Extrasolar, Stars and Exoplanets in Celestia, in an attempt to unify those addons so that anyone who wants to look for them need not go further and backwards in time, since several good addons may have been lost or "buried", so to speak. It just so happened that your first post is older than gironde's original post, which was the basis for the original post CM1215 mentioned.

Regardless, I'll just make a new official addon post related to any extrasolar but not extragalactic objects, and then hope for the best.
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