Populating WLM (and other galaxies) with REAL stars

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SpaceFanatic64
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My Addons

Post #61by SpaceFanatic64 » 21.12.2018, 19:10

Here, I will be posting any addons that I have made. Stay tuned for some addons that I worked really hard on! :wink:

Added after 9 minutes 52 seconds:
My version of the Kepler-90 system. Textures were taken from fungun and Fugazi's Star Trek addons from the Celestia Motherlode, and the star data was from Wikipedia and the exoplanet orbits were from exoplanet.eu.
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Kepler-90.zip
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Post #62by LukeCEL » 22.12.2018, 02:04

SpaceFanatic64, your coordinates are a bit off. To calculate the RA and Dec, you can use a converter (I recommend http://www.astrouw.edu.pl/~jskowron/ra-dec/, since it's very flexible).

For example, for Kepler-90 just enter "18 57 44.0384 +49 18 18.4958" and pick the eleventh option, so that's "284.4334933" and "49.3051377".

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Post #63by SpaceFanatic64 » 22.12.2018, 02:49

Oh, I just didn't know how to convert RA and Dec. I'll update the addon to have the right coordinates.
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Post #64by gironde » 22.12.2018, 10:49

an other addon for Kepler-90 viewtopic.php?p=141549#p141549
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Post #65by gironde » 22.12.2018, 12:17

I am not convinced by this conversion site. See the results for:
-18: 04: 20.99 (hh: mm: ss.ss)
result
-18: 04: 02.00 01: 00: 00.00
-18 04 02.00 01 00 00.00
-18: 04: 02.00, 01: 00: 00.00
-18.0672222 1.0000000
-18h 04m 02.00s 01d 00m 00.00s
-18h04m02.00s 01d00m00.00s
-18h04m02.00s 01 ° 00'00.00 "
J-180402.00 010000.00 +

for convert RA hh:mm:ss.ss in decimal degres :
Abs (hh*15+mm*0.25+ss*0.0041666) * +1 or -1 (according to the sign)

and DEC degres dd:mn:ss in decimal degres:
Abs (dd+mn/60+ss/3600) * +1 or -1 (according to the sign)

and parsec (pc) to ly : pc*3.2616
ly to pc : ly/3.2616

Radius in Rsol to km : 696342*Rsol
Radius in Rearth to km : 6378.1*Rearth
Radius in Rjup to km : 71492*Rjup

Period Day in Period Year : Period D/365.2425


Easy to make with Excel

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Post #66by LukeCEL » 22.12.2018, 16:53

gironde, Good catch. It seems that the site has a problem when it only converts the right ascension. However, if you enter in both the right ascension and the declination, the problem disappears.

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Post #67by gironde » 22.12.2018, 17:46

ok LukeCEL

:hi:

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Post #68by SpaceFanatic64 » 24.12.2018, 02:12

Finally, the update for Kepler-90. Replace RA and Dec in the .stc with these following lines: RA 284.4334933 and Dec 49.3051377.
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Post #69by SpaceFanatic64 » 01.02.2019, 15:02

Sorry for not being here in a while. I've been busy with school, so I won't make addons all the time, but I will make them once in a while
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Post #70by 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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Post #71by 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 #72by 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 #73by 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 #74by 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 #75by 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 #76by 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 #77by 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 #78by 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 #79by 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 #80by 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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