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 Post subject: Retrograde planet?
PostPosted: Tue, 24-05-16, 19:36 GMT 
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Posts: 339
Location: Switzerland
A strange orbital configuration at Nu Octantis, from Ramm et al. (2016). Probably it would be included in the list of confirmed planets by now were it not for the close binary star. The planet would not be stable in a prograde orbit.

stc file:
Code:
Barycenter 107089 "NU Oct"
{
   RA<deg> 325.369374
   Dec<deg> -77.390043
   Distance<pc> 22.10
}

"NU Oct A:HIP 107089 A:HD 205478 A:CCDM J21415-7723A"
{
   AppMag 3.743
   Radius<rS> 5.81
   Temperature 4860
   SpectralType "K0III"

   OrbitBarycenter "NU Oct"

   EllipticalOrbit   {
      Period<d> 1051.05
      SemiMajorAxis<AU> 0.70102
      Eccentricity 0.2368
      ArgOfPericenter<deg> 272.9
      Inclination<deg> 97.8
      AscendingNode<deg> 232.7
      MeanAnomaly<deg> 339.3
      Epoch 2452068.0607
   }
}

"NU Oct B:HIP 107089 B:HD 205478 B:CCDM J21415-7723B"
{
   AbsMag 9.5 # guess based on mass
   SpectralType "M1" # guess based on mass

   OrbitBarycenter "NU Oct"

   EllipticalOrbit   {
      Period<d> 1051.05
      SemiMajorAxis<AU> 1.92857
      Eccentricity 0.2368
      ArgOfPericenter<deg> 92.9
      Inclination<deg> 97.8
      AscendingNode<deg> 232.7
      MeanAnomaly<deg> 339.3
      Epoch 2452068.0607
   }
}


ssc file:
Code:
"b" "NU Oct A"
{
   Radius<rJ> 1 # guess
   Mass 669
   Texture "exo-class3.*" # guess

   EllipticalOrbit
   {
      Period<d> 412.942
      SemiMajorAxis<AU> 1.27261
      Eccentricity 0.12
      ArgOfPericenter<deg> 352.0
      Inclination<deg> 82.9
      AscendingNode<deg> 24.9
      MeanAnomaly<deg> 315.0
      Epoch 2452068.0607
   }

   UniformRotation
   {
      Period<h> 10 # guess
      Inclination<deg> 82.9 # to match orbit
      AscendingNode<deg> 24.9 # to match orbit
   }
}


Attachments:
File comment: The Nu Octantis system
nuOct.jpg
nuOct.jpg [ 26.68 KiB | Viewed 650 times ]


Last edited by ajtribick on Tue, 24-05-16, 20:10 GMT, edited 1 time in total.
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 Post subject: Re: Retrograde planet?
PostPosted: Tue, 24-05-16, 20:06 GMT 
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Joined: Fri, 31-08-07, 7:01 GMT
Posts: 4465
Location: Hamburg, Germany
Very interesting... I'll have a look.

Fridger

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