New Extrasolar Planets

[chris]

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

[Evil Dr Ganymede]

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?

[AstroBoy]

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

[AstroBoy]

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 ?

[chris]

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

--Chris

[chris]

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
   }
}


[billybob884]

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?

[AstroBoy]

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

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: