Celestia Forums

Posted: **02.07.2003, 17:17**

Eight newly discovered extrasolar planets were announced at the end of June. One was discovered by a Japanese team (first extrasolar planet found by this group), and the other finds are from Mayor's team. There are a couple of the planets that I think are particularly interesting. HD 169830 c is the second planet found to orbit F8V star HD 169830. It's orbit is circular with a radius of 2.75 AU--one of the more Jupiter-like planets discovered. The other interesting system is the 'hierarchic quadruple' HD 41004. HD 41004 A and B are K2V and M4V stars which orbit each other. 41004 A has a 2.3 Jupiter mass companion, and M4V is circled by a 19 Jupiter mass brown dwarf.

These planets will be in the 1.3.1 release of Celestia . . . Here are the planets definitions you can add to extrasolar.ssc if you don't want to wait:

Code: Select all

# HD 104985
# First planet discovered by Japanese team of Sato, Ando, et al
"b" "HD 104985"
{
   Texture "jupiterlike.jpg"
   Mass 2000
   Radius 67000

   InfoURL "http://www.obspm.fr/encycl/HD104985.html"

   EllipticalOrbit {
      Period         0.5426
      SemiMajorAxis 0.78
      Eccentricity  0.03
   }
}


# HD 41004 A
# Planet in a hierarchic quadruple system: planet orbits a K2V star, and this
# system is bound to a M4V star and brown dwarf pair
"b" "HD 41004"
{
   Texture "jupiterlike.jpg"
   Mass 730
   Radius 67000

   InfoURL "http://www.obspm.fr/encycl/HD41004A.html"

   EllipticalOrbit {
      Period         1.793
      SemiMajorAxis 1.31
      Eccentricity  0.39
   }
}


# HD 65216
"b" "HD 65216"
{
   Texture "jupiterlike.jpg"
   Mass 425
   Radius 72000

   InfoURL "http://www.obspm.fr/encycl/HD65216.html"

   EllipticalOrbit {
      Period         1.582
      SemiMajorAxis 1.31
      Eccentricity  0.29
      # Omega 184.7
      # T_peri 2450833
   }
}


# HD 111232 system (G8V)
"b" "HD 111232"
{
   Texture "jupiterlike.jpg"
   Mass 2500
   Radius 63000

   InfoURL "http://www.obspm.fr/encycl/HD111232.html"

   EllipticalOrbit {
      Period         3.110
      SemiMajorAxis 2.07
      Eccentricity  0.25
      # Omega 96.6
      # T_peri 2451228
   }
}


# HD 142415 system (G1V)
"b" "HD 142415"
{
   Texture "jupiterlike.jpg"
   Mass 550
   Radius 71000

   InfoURL "http://www.obspm.fr/encycl/HD142415.html"

   EllipticalOrbit {
      Period         1.061
      SemiMajorAxis 1.07
      Eccentricity  0.5
      # Omega 254
      # T_peri 2451516.1
   }
}


# HD 216770 system (K1V)
"b" "HD 216770"
{
   Texture "jupiterlike.jpg"
   Mass 225
   Radius 65000

   InfoURL "http://www.obspm.fr/encycl/HD216770.html"

   EllipticalOrbit {
      Period         0.3231
      SemiMajorAxis 0.46
      Eccentricity  0.32
      # Omega 270
      # T_peri 2452667.9
   }
}


# HD 10647 system (F9V)
"b" "HD 10647"
{
   Texture "jupiterlike.jpg"
   Mass 375
   Radius 72000

   InfoURL "http://www.obspm.fr/encycl/HD10647.html"

   EllipticalOrbit {
      Period         2.891
      SemiMajorAxis 2.10
      Eccentricity  0.32
      # Omega 44.4
      # T_peri 2452162
   }
}


"c" "HD 169830"
{
   Texture "jupiterlike.jpg"
   Mass 750
   Radius 72000

   InfoURL "http://www.obspm.fr/encycl/HD169830.html"

   EllipticalOrbit {
      Period         4.071
      SemiMajorAxis 2.75
      Eccentricity  0
      # Omega 43.6
      # T_peri 2451483.6
   }
}

--Chris

Posted: **02.07.2003, 17:44**

When I went to look at HD 41004, I found a K2 V with two jupiter like 'b' planets orbiting it, and no sign of an M dwarf or brown dwarf. One was 0.8 AU from the K2 dwarf, the other was 0.856 AU from the K2 dwarf.

I made a file called 'new_extrasolar.ssc', copied what you wrote, and put that in my extras folder. Has Celestia got confused somehow?

Posted: **02.07.2003, 17:59**

Maybe a silly question but, why does the first star of the list named "HD 104985" is called "HD 41004" in celestia ?

Posted: **02.07.2003, 18:05**

When I went to look at HD 41004, I found a K2 V with two jupiter like 'b' planets orbiting it, and no sign of an M dwarf or brown dwarf. One was 0.8 AU from the K2 dwarf, the other was 0.856 AU from the K2 dwarf.

I made a file called 'new_extrasolar.ssc', copied what you wrote, and put that in my extras folder. Has Celestia got confused somehow?

Isn't it due to the name confusion I quote above ?

Posted: **02.07.2003, 18:20**

Oops . . . Stupid copy and paste error. I edited my post and fixed the name.

--Chris

Posted: **04.07.2003, 10:57**

Here's another new one . . . This planet has a very Jupiter like orbit--almost circular and 3.3 AU from the sun.

--Chris

Code: Select all

# HD 70642 (G5V)
"b" "HD 70642"
{
   Texture "jupiterlike.jpg"
   Mass 640
   Radius 69000

   InfoURL "http://www.obspm.fr/encycl/HD70642.html"

   EllipticalOrbit {
      Period         6.108
      SemiMajorAxis 3.3
      Eccentricity  0.1
      # Omega 277
      # T_peri 2451749
   }
}

Posted: **04.07.2003, 16:40**

How about instead of posting them all here, just put them in an ssc file and have it distributed with the final release of celestia?

Posted: **04.07.2003, 17:05**

How about instead of posting them all here, just put them in an ssc file and have it distributed with the final release of celestia?

You should read post completely :wink:

These planets will be in the 1.3.1 release of Celestia . . . Here are the planets definitions you can add to extrasolar.ssc if you don't want to wait:

Celestia Forums

New Extrasolar Planets

New Extrasolar Planets