Stars far from home

[Chuft-Captain]

Spaceman,

I'm not sure about the normal map problem, but the second problem is a known bug.

In distant star-systems (> 16,000 LY), at observer distances < 1 LY the stars render normally...
but at > 1LY distance all stars render with hugely exaggerated luminosity.

I mentioned this to Chris a couple of months ago and AFAIK he's working on a fix for it, if he hasn't fixed it already. (You don't mention which version of Celestia you are using -- are you using the latest SVN version?).

Apparently the problem only occurs in the Basic and Multitexture paths, so in the meantime you could try switching to the OpenGL2.0 path.

CC

[Spaceman]

In distant star-systems (> 16,000 LY), at observer distances < 1 LY the stars render normally...
but at > 1LY distance all stars render with hugely exaggerated luminosity.

The example i use is one of the nearest star systems

(You don't mention which version of Celestia you are using -- are you using the latest SVN version?).

I use the default version from here

Apparently the problem only occurs in the Basic and Multitexture paths, so in the meantime you could try switching to the OpenGL2.0 path.

What to you mean? How can i do this?

[Spaceman]

Damn, i forgot something. I forgot to report that thanks to this patch, i start to create real world stars in far distances . The first was the LBV 1806-20, the most luminous known star . But there is something wrong with it. Here are the informations:

Code: Select all

033566823 "LBV 1806-20"
{
RA 18.08403
Dec -20.2441
Distance 49000
SpectralType "O9"
AbsMag 8.4
}

The TYC number is fictional and all informations are from Wikipedia. Now watch the picture.

s.jpg

Is this the most luminous known star towards the center of the galaxy? No! This star is smaller and dimmer than Sun and it's out of the Galaxy What i made wrong?

[selden]

"8th magnitude at the near infrared wavelength of 2 micrometers" means it has an apparent IR magnitude of 8, not absolute IR magnitude of 8. But in Celestia you need to specify its apparent visual magnitude, not its IR magnitude: "it is calculated to be about 35th magnitude at visible wavelengths, which is undetectable." (both quotes are from the Wikipedia article)

Code: Select all

AppMag 35


[Spaceman]

Thanks Selden
Here are the new informations for this star:

Code: Select all

033566823 "LBV 1806-20"
{
RA 18.08403
Dec -20.2441
Distance 49000
SpectralType "O9"
AppMag 35
Radius 104325000 # 150 R
}

Now the star is better but i would like to be as bright as it is in reality (don't forget, it's the the most luminous known star ), no matter if will be visible from Earth . And how about the location? Wikipedia says that this star is towards the center of the galaxy .

[symaski62]

In distant star-systems (> 16,000 LY), at observer distances < 1 LY the stars render normally...
but at > 1LY distance all stars render with hugely exaggerated luminosity.

viewtopic.php?f=3&t=12425

3.261563776/(0.203847736/1000) = 16000 Ly

mas = 0.20387736

[Chuft-Captain]

mas = 0.20387736

mas????

Mutant Analysis Service?
Make A Star??? ::
http://spaceplace.nasa.gov/en/kids/st6starfinder/st6starfinder.shtml
http://www.makeastar.com/asps/index.asp

[selden]

I'm guessing he means milli-arc-seconds

[symaski62]

mas = 0.20387736

mas????

Mutant Analysis Service?
Make A Star??? ::
http://spaceplace.nasa.gov/en/kids/st6starfinder/st6starfinder.shtml
http://www.makeastar.com/asps/index.asp

LOL 25 old ?h?h?h !

I'm guessing he means milli-arc-seconds

ty selden

[Chuft-Captain]

Just symaski62 being as concise and cryptic as usual. Well guessed Selden.

[Spaceman]

Hello

Thanks to this patch, i create some stars which are in distances far than 16.000 light years . Here we are:

Code: Select all

033566823 "LBV 1806-20"
{
RA 270.120605
Dec -20.2441
Distance 49000
SpectralType "O9"
InfoURL "http://en.wikipedia.org/wiki/LBV_1806-20"
#AppMag 35
AppMag -1 
Radius 104325000
}

033566824 "LH54-425"
{
RA 75.390364
Dec -67.3017
Distance 170000
SpectralType "O5"
InfoURL "http://en.wikipedia.org/wiki/LH54-425"
AppMag 13.1
Radius 12171250
}

033566825 "RV Tauri:HD 283868:BD+25 732"
{
RA 60.705101
Dec 26.1046
Distance 20000
SpectralType "M2 Ia"
InfoURL "http://en.wikipedia.org/wiki/RV_Tauri"
AppMag 9.8
Radius 20865000
}

033566826 "Pistol"
{
RA 255.690230
Dec -28.5004
Distance 25000
SpectralType "O1"
InfoURL "http://en.wikipedia.org/wiki/Pistol_Star"
AppMag 4
Radius 236470000
}

033566827 "HE 0107-5240:2MASS J01092916-5224341"
{
RA 15.135437
Dec -52.2420
Distance 36000
SpectralType "K5"
InfoURL "http://en.wikipedia.org/wiki/HE0107-5240"
AppMag 15.86
Radius 6955000
}

033566828 "S Doradus:RMC 88:HD 35343:IRAS 05182-6918"
{
RA 75.270215
Dec -69.1501
Distance 169000
SpectralType "A0"
InfoURL "http://en.wikipedia.org/wiki/S_Doradus"
AppMag 9.721
Radius 271245000
}

033566829 "HE 0437-5439"
{
RA 60.570192
Dec -54.3312
Distance 200000
SpectralType "BV"
InfoURL "http://en.wikipedia.org/wiki/HE_0437-5439"
AppMag 16.3
Radius 2782000
}

033566830 "OGLE-2003-BLG-235:MOA-2003-BLG-53L"
{
RA 270.75245
Dec -28.5342
Distance 19000
SpectralType "K"
InfoURL "http://en.wikipedia.org/wiki/OGLE-2003-BLG-235/MOA-2003-BLG-53"
AppMag 19.7
Radius 695500
}

033566831 "OGLE-2005-BLG-390L:EWS 2005-BLG-390L"
{
RA 255.810285
Dec -30.2238
Distance 21500
SpectralType "M"
InfoURL "http://en.wikipedia.org/wiki/OGLE-2005-BLG-390L"
AppMag 20
Radius 347750
}

033566832 "PSR B1913+16:J1915+1606:Remnant of Star of Bethlehem?"
{
RA 285.195187
Dec 16.0108
Distance 21000
SpectralType "Q"
InfoURL "http://en.wikipedia.org/wiki/PSR_B1913%2B16"
AppMag 20
Radius 20
}

033566833 "WR 20"
{
RA 150.345734
Dec -57.4549
Distance 20000
SpectralType "WN 6"
InfoURL "http://en.wikipedia.org/wiki/Westerlund_2"
AppMag 15
Radius 13423150
}

033566834 "PSR J0537-6910"
{
RA 75.555714
Dec -69.1020
Distance 170000
SpectralType "Q"
InfoURL "http://en.wikipedia.org/wiki/PSR_J0537-6910"
AppMag 20
Radius 30
}

033566835 "CXO J164710.2-455216"
{
RA 15.00647
Dec -72.1134
Distance 17000
SpectralType "Q"
InfoURL "http://en.wikipedia.org/wiki/CXO_J164710.2-455216"
AppMag 20
Radius 40
}

033566836 "DL Crucis:V* DL Cru:HD 106343:SAO 251803:HIP 59678"
{
RA 180.210254
Dec -64.2431
Distance 20000
SpectralType "B1"
InfoURL "http://en.wikipedia.org/wiki/DL_Crucis"
AbsMag 6.303
}

033566837 "R Andromedae:HD 1967:SAO 53860:HIP 1901"
{
RA 0.36029
Dec 38.3437
Distance 54369
SpectralType "?"
InfoURL "http://en.wikipedia.org/wiki/R_Andromedae"
AbsMag 9.36
}

033566838 "SGR 1900+14"
{
RA 285.105253
Dec 09.1850
Distance 20000
SpectralType "Q"
InfoURL "http://en.wikipedia.org/wiki/SGR_1900%2B14"
AppMag 20
Radius 30
}

033566838 "PSR J1748-2446"
{
RA 255.720
Dec -24.48
Distance 28000
SpectralType "Q"
InfoURL "http://en.wikipedia.org/wiki/PSR_J1748-2446ad"
AppMag 5.28
Radius 30
}


s.jpg

The TYC numbers are fictional and all informations are from Wikipedia. I hope that you like them . Any comments are welcomed. One day maybe i create an add on which fills up Milky Way

[ajtribick]

You do realise that you can leave out the HIP/TYC number, to save you from having to generate fake ones.

I have already implemented the microlensing planet host stars (and their planets) using data from the scientific literature (as opposed to Wikipedia) in the "microlensing planets" add-on here.

[Spaceman]

You do realise that you can leave out the HIP/TYC number, to save you from having to generate fake ones.

How can i do this? When i try it (just dismiss the HIP/TYC numbers), i can't find the star

I have already implemented the microlensing planet host stars (and their planets) using data from the scientific literature (as opposed to Wikipedia) in the "microlensing planets" add-on here.

Yeah, i notice more and better informations (including planets ). Good job

[ajtribick]

This works for me.

Code: Select all

"LBV 1806-20"
{
RA 270.120605
Dec -20.2441
Distance 49000
SpectralType "O9"
InfoURL "http://en.wikipedia.org/wiki/LBV_1806-20"
#AppMag 35
AppMag -1
Radius 104325000
}

[Spaceman]

I try it now and you have totally right
Thank you very much

[fsgregs]

Spaceman:

The deep blue texture you've used for LBV-1806. Is it available for us to download?

Frank

[Spaceman]

The texture is not mine but is creation by Rassilon . Click here and select stars_v2.zip or stars_v3.zip

[happywoman50]

Code: Select all

Spaceman said
The texture is not mine but is creation by Rassilon . Click here and select stars_v2.zip or stars_v3.zip


I downloaded these textures and I think that they are very interesting.

[Rassilon]

omg this is amazing!!!! Now I do have to come back!!!

I love you guys your the best!!! Great work on defeating the great 16k barrier...

[Spaceman]

Welcome back Rassilon, glad to see you again
I use your Cluster Generator to create the Sky River Project, which create our Milky Way. I have plenty of work to do, but our galaxy will be full of stars