Inclination for a barycenter ?

[jujuapapa]

Hi guys,

I appeal to you because I can't align (point of view) a binary system with the sun.
It's like putting 3 points on the same line.
2 of the points are made up of a binary system.

Is Celestia able to tilt in barycenter and its components?

Here is my stc's try :

Code: Select all

# Star A TYC 1234-5678-A -  RA = 12 00 00, Dec = +20 00 00
# Star B TYC 1234-5678-B -  RA = 12 00 00, Dec = +20 00 00

Barycenter 12345 "Star_A"
{
      RA  180.0000
   Dec 20.0000
        Distance 200.0
        Inclination -20.0000
}

#
# Star B
#

B056781234 "Star B"
{
    OrbitBarycenter "Star_A"

   SpectralType "G1V"
   AbsMag 4.67

    EllipticalOrbit {
        Period            1000
        SemiMajorAxis      100
        Eccentricity         0.01
        Inclination          0
        AscendingNode      193.326
        ArgOfPericenter    180.0
        MeanAnomaly        125.000
    }

}

A056781234 "Star A"
{
    OrbitBarycenter "Star_A"
    SpectralType "K2III"
    AbsMag 0.98

    EllipticalOrbit {
        Period            1000
        SemiMajorAxis     100
        Eccentricity         0.01
        Inclination          0
        AscendingNode      193.326
        ArgOfPericenter      0.0
        MeanAnomaly        125.000
    }
}

Thanks for your feedback.

[Fafers_br]

Hi jujuapapa.

I think what you want is basically a system inclined 90º relative to the plane-of-sky. I recommend you use Grant Hutchison's starorbs spreadsheet for Celestia.

Here's the code using your data in Grant Hutchison's spreadsheet, supposing that the AscendingNode you provided is relative to the plane-of-sky:

Code: Select all

Barycenter "Star_A"
{
      RA  180.0000
   Dec 20.0000
        Distance 200.0
        #Inclination -20.0000
}

#
# Star B
#

"Star B"
{
    OrbitBarycenter "Star_A"

   SpectralType "G1V"
   AbsMag 4.67

   EllipticalOrbit {      
     Period  1000      
     SemiMajorAxis  100
     Eccentricity  0.01      
     Inclination  79.144 #90 (plane-of-sky)   
     AscendingNode  355.396 # 193.326      
     ArgOfPericenter  71.366 #180      
     MeanAnomaly  125      
   }      

}

"Star A"
{
    OrbitBarycenter "Star_A"
    SpectralType "K2III"
    AbsMag 0.98

   EllipticalOrbit {      
     Period  1000      
     SemiMajorAxis  100      
     Eccentricity  0.01      
     Inclination  79.144 #90      
     AscendingNode  355.396 # 193.326      
     ArgOfPericenter  251.366 #0      
     MeanAnomaly  125      
   }      
}

They will be aligned in 2405 Dec 20 (transit of Star B).
Please forgive me if I understood your question incorrectly.

[jujuapapa]

@Fafers_br : thank you for your answer but... picture is better than words :
It's the result of your stc's file.

and I would like that :

coming from the sun, we should not see the star B behind the star A... (picture made with celestia and paint).
=> The orbit that we see is the Star_A_planet_Ab's orbit.

I hope my explanation is clearer.

[Fafers_br]

Hi Jujuapapa.

This is strange. In my Celestia the code I sent resulted in the figure bellow when viewing from the Sun:

The orbits are aligned and it's an eclipsing system. Of course, you'd have to change the orbital parameters of the rest of the system to match the orbits of the stars, if desired.

Is it not an eclipsing system that you want? If not, I'm affraid I did not understand your question.

[jujuapapa]

Tx again Fafers_br, you're right !

My request relates only to the final visual, namely the star B must be hidden behind the star A when we come from our sun.

What parameters in stc file should be changed to have this screen?

[Fafers_br]

Hi Jujuapapa!

Try this:

Code: Select all

Barycenter "Star_A"
{
      RA  180.0000
   Dec 20.0000
        Distance 200.0
        #Inclination -20.0000
}

#
# Star B
#

"Star B"
{
    OrbitBarycenter "Star_A"

   SpectralType "G1V"
   AbsMag 4.67

EllipticalOrbit {
  Period  1000
  SemiMajorAxis  100
  Eccentricity  0.01
  Inclination  18.288 #90 (plane-of-sky)
  AscendingNode  81.761
  ArgOfPericenter  0
  MeanAnomaly  88.854
  Epoch  2458835 # 17 dec 2019 12:00:00 UTC
}

}

"Star A"
{
    OrbitBarycenter "Star_A"
    SpectralType "K2III"
    AbsMag 0.98

EllipticalOrbit {
  Period  1000
  SemiMajorAxis  100
  Eccentricity  0.01
  Inclination  18.288 #90
  AscendingNode  81.761
  ArgOfPericenter  180
  MeanAnomaly  88.854
  Epoch  2458835
}

}

Hope now it's what you wanted.
Best regards.

[jujuapapa]

YES !
It works fine... Thank you Fafers_br.

To end this subject, can you tell me what are the rules for another coordinates ?
Here or by pm.