I may create an addon to show the source located in NGC 4993 :
Suggestions ?
Original scientific paper : https://arxiv.org/pdf/1710.05833.pdf
Wikipedia : https://en.wikipedia.org/wiki/GW170817
More to follow...
Added after 3 hours 53 minutes:
I'm currently unable to find the exact coordinates of the source located in NGC 4993, that was seen in the optical band. Surely that could be found somewhere.
Added after 5 minutes 35 seconds:
This event is a major landmark, and it could be important to show it in Celestia. It's the first neutron stars collision that have been identified, combined with gravitational waves detected with both LIGO and Virgo, and there's also an electromagnetic signal associated to the event, on the whole electromagnetic spectrum. This is the real start of multi-messenger astronomy ! It's only missing (?) the neutrinos ! Thus, this event is well worth showing in Celestia !
Gravitational waves from NGC 4993
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Topic authorCham
- Posts: 4324
- Joined: 14.01.2004
- Age: 60
- With us: 20 years 9 months
- Location: Montreal
Gravitational waves from NGC 4993
"Well! I've often seen a cat without a grin", thought Alice; "but a grin without a cat! It's the most curious thing I ever saw in all my life!"
There are plenty of converters on the internet.
Look at this one: https://www.swift.psu.edu/secure/toop/convert.htm
Look at this one: https://www.swift.psu.edu/secure/toop/convert.htm
CM1215: Celestial master in learning.
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Topic authorCham
- Posts: 4324
- Joined: 14.01.2004
- Age: 60
- With us: 20 years 9 months
- Location: Montreal
Ok, I got it right !
Here's a very preliminary addon displaying something weird at the proper location, near NGC 4993. (turn on nebulae, then get close and personal)
I should replace the current sprite model (a simple nebula) with a billboard displaying some usefull information about the historical event.
Any suggestion for a billboard ?
Here's the small (unfinished) addon :
(229 KB zip file)
Here's a preview of the location :
Here's a very preliminary addon displaying something weird at the proper location, near NGC 4993. (turn on nebulae, then get close and personal)
I should replace the current sprite model (a simple nebula) with a billboard displaying some usefull information about the historical event.
Any suggestion for a billboard ?
Code: Select all
Nebula "GW170817"
{
Mesh "LMC1.cmod"
Radius 100
RA 13.1633569 # Galaxy : 13.1631
Dec -23.3814842 # Galaxy : -23.3839
Distance 1.435E8 # method: V_cmb
Axis [ -0.8032 -0.0119 -0.5956]
Angle 83.0961
InfoURL "http://en.wikipedia.org/wiki/GW170817"
}
Here's the small (unfinished) addon :
(229 KB zip file)
Here's a preview of the location :
"Well! I've often seen a cat without a grin", thought Alice; "but a grin without a cat! It's the most curious thing I ever saw in all my life!"
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Topic authorCham
- Posts: 4324
- Joined: 14.01.2004
- Age: 60
- With us: 20 years 9 months
- Location: Montreal
A spacetime location in Celestia would be... lost in spacetime ! Without a script, it would be difficult to find.
I prefer a permanent location billboard, using a single sprite. I'll test a proof of concept later.
Added after 15 minutes 43 seconds:
Here's another version, with a sprite billboard. The picture could be changed very easily.
(397 KB zip file)
Added after 12 minutes 8 seconds:
I found a nice picture to use as a landmark billboard, from this place : http://i2.wp.com/www.gw.iucaa.in/wp-content/uploads/2017/10/GW170817_infographic.png.
Just edit the CMOD file as this, and download the PNG file given below, and place it into the textures/medres folder :
In Celestia, type GW, then complete its name, then go ! I think it is pretty nice !
Here's a preview :
I prefer a permanent location billboard, using a single sprite. I'll test a proof of concept later.
Added after 15 minutes 43 seconds:
Here's another version, with a sprite billboard. The picture could be changed very easily.
(397 KB zip file)
Added after 12 minutes 8 seconds:
I found a nice picture to use as a landmark billboard, from this place : http://i2.wp.com/www.gw.iucaa.in/wp-content/uploads/2017/10/GW170817_infographic.png.
Just edit the CMOD file as this, and download the PNG file given below, and place it into the textures/medres folder :
Code: Select all
#celmodel__ascii
material # 1 Billboard
emissive 1 1 1
diffuse 1 1 1
opacity 1
texture0 "GW170817_infographic.png"
end_material
mesh
vertexdesc position f3 pointsize f1 end_vertexdesc
vertices 1
0 0 0 1
sprites 0 1
0
end_mesh
In Celestia, type GW, then complete its name, then go ! I think it is pretty nice !
Here's a preview :
"Well! I've often seen a cat without a grin", thought Alice; "but a grin without a cat! It's the most curious thing I ever saw in all my life!"