HD 98800 - 4 star system

[LordFerret]

I was looking through the NASA/JPL site and saw an interesting article linked to the Spitzer site. The article deals with the quadruple-star system HD 98800 and its potential to contain newly forming planets.

http://www.nasa.gov/mission_pages/spitzer/multimedia/spitzer20070724.html

Here are a few related abstracts -
1) http://arxiv.org/abs/0705.0380
2) http://www.aas.org/publications/baas/v37n2/aas206/306.htm
3) http://www.aas.org/publications/baas/v31n5/aas195/886.htm
4) http://www.journals.uchicago.edu/ApJ/journal/issues/ApJ/v498n1/37029/sc0.html?erFrom=-5638995264893352090Guest

Immediately Cham's Accretion Disc comes to my mind!

This star system is not in Celestia.

HD 98800 - SIMBAD
HD 98800b - SIMBAD

HD 98800 - VizieR, listed as TYC 6654-219-1

[ajtribick]

What on earth is this thread doing in Purgatory? Surely it fits in Physics & Astronomy?

[selden]

moved.

[LordFerret]

I've been very busy with other work lately, but at some point (someday lol) I'd like to try and create the STC (?) file for this... and perhaps even with a 'lite' version of Cham's accretion disc addon (because I don't think my machine can handle his current version ) - or something similar.

What I found most interesting about the article(s) and discovery, is the distance from HD 98800 B the clearing/gap in the dust ring is... and how it's proposed that an orbiting body(s) could be forming. I'm wondering if the next discovery is that of another new (very young!) exoplanet?!

[NuclearVacuum]

I coded this awhile ago. It's probably not accurate (but I do not know the proper data for this star system). I pretty much "Christmas treed" all the data I couldn't find. I made system "A" further from each other (in comparison to system "B"), so any planets around star "B" would see the two "A" stars with relative ease. Hope everybody will enjoy this

Code: Select all

# ---------------
# HD 98800 system
# ---------------

Barycenter 55505 "HD 98800"
   {
   RA      170.52204083
   Dec      -24.8771
   Distance   150.00
   }

Barycenter "HD 98800 A"
   {
   OrbitBarycenter   "HD 98800"
   EllipticalOrbit
      {
      Period      300 # est.
      SemiMajorAxis   50.00
      Eccentricity   0.10 # plausible guess
      Inclination      0.00
      ArgOfPericenter   0.00
      }
   }

"HD 98800 Aa"
   {
   OrbitBarycenter   "HD 98800 A"
   SpectralType   "K4V"
   AppMag      9.11
   EllipticalOrbit
      {
      Period      0.22
      SemiMajorAxis   0.3
      Eccentricity   0.5
      Inclination      75.00
      ArgOfPericenter   180.00
      }
   }

"HD 98800 Ab"
   {
   OrbitBarycenter   "HD 98800 A"
   SpectralType   "K4V"
   AppMag      9.11
   EllipticalOrbit
      {
      Period      0.22
      SemiMajorAxis   0.3
      Eccentricity   0.5
      Inclination      75.00
      ArgOfPericenter   0.00
      }
   }

Barycenter "HD 98800 B"
   {
   OrbitBarycenter   "HD 98800"
   EllipticalOrbit
      {
      Period      300 # est.
      SemiMajorAxis   50.00
      Eccentricity   0.10 # plausible guess
      Inclination      0.00
      ArgOfPericenter   180.00
      }
   }

"HD 98800 Ba"
   {
   OrbitBarycenter   "HD 98800 B"
   SpectralType   "K5Ve"
   AppMag      9.11
   EllipticalOrbit
      {
      Period      0.02743
      SemiMajorAxis   0.11
      Eccentricity   0.02
      Inclination      25.00
      ArgOfPericenter   0.00
      }
   }

"HD 98800 Bb"
   {
   OrbitBarycenter   "HD 98800 B"
   SpectralType   "K5Ve"
   AppMag      9.11
   EllipticalOrbit
      {
      Period      0.02743
      SemiMajorAxis   0.11
      Eccentricity   0.02
      Inclination      25.00
      ArgOfPericenter   180.00
      }
   }


[Hungry4info]

Hey thanks for that .STC !

[NuclearVacuum]

Hey thanks for that .STC !

I had no idea you were here. I know you from EV ^_^

[Hungry4info]

Hey thanks for that .STC !

I had no idea you were here. I know you from EV ^_^

Lol yep! Screen name is 'Sirius_Alpha' on EVII.

[LordFerret]

This world just keeps getting smaller doesn't it!

[NuclearVacuum]

I coded this awhile ago. It's probably not accurate (but I do not know the proper data for this star system). I pretty much "Christmas treed" all the data I couldn't find. I made system "A" further from each other (in comparison to system "B"), so any planets around star "B" would see the two "A" stars with relative ease. Hope everybody will enjoy this

Code: Select all

# ---------------
# HD 98800 system
# ---------------

Barycenter 55505 "HD 98800"
   {
   RA      170.52204083
   Dec      -24.8771
   Distance   150.00
   }

Barycenter "HD 98800 A"
   {
   OrbitBarycenter   "HD 98800"
   EllipticalOrbit
      {
      Period      300 # est.
      SemiMajorAxis   50.00
      Eccentricity   0.10 # plausible guess
      Inclination      0.00
      ArgOfPericenter   0.00
      }
   }

"HD 98800 Aa"
   {
   OrbitBarycenter   "HD 98800 A"
   SpectralType   "K4V"
   AppMag      9.11
   EllipticalOrbit
      {
      Period      0.22
      SemiMajorAxis   0.3
      Eccentricity   0.5
      Inclination      75.00
      ArgOfPericenter   180.00
      }
   }

"HD 98800 Ab"
   {
   OrbitBarycenter   "HD 98800 A"
   SpectralType   "K4V"
   AppMag      9.11
   EllipticalOrbit
      {
      Period      0.22
      SemiMajorAxis   0.3
      Eccentricity   0.5
      Inclination      75.00
      ArgOfPericenter   0.00
      }
   }

Barycenter "HD 98800 B"
   {
   OrbitBarycenter   "HD 98800"
   EllipticalOrbit
      {
      Period      300 # est.
      SemiMajorAxis   50.00
      Eccentricity   0.10 # plausible guess
      Inclination      0.00
      ArgOfPericenter   180.00
      }
   }

"HD 98800 Ba"
   {
   OrbitBarycenter   "HD 98800 B"
   SpectralType   "K5Ve"
   AppMag      9.11
   EllipticalOrbit
      {
      Period      0.02743
      SemiMajorAxis   0.09
      Eccentricity   0.02
      Inclination      25.00
      ArgOfPericenter   0.00
      }
   }

"HD 98800 Bb"
   {
   OrbitBarycenter   "HD 98800 B"
   SpectralType   "K5Ve"
   AppMag      9.11
   EllipticalOrbit
      {
      Period      0.02743
      SemiMajorAxis   0.1
      Eccentricity   0.02
      Inclination      25.00
      ArgOfPericenter   180.00
      }
   }


I have redone my code. I misunderstood several key code ("RA" and "Dec" to name a few), and I made the system more open and free. I made the HD 98800 A system further apart from each other (so any planet orbiting HD 98800 B would see two separate stars). I also fixed the "AppMag" so it would be correct for the spectral types I used. Hope you find this code just as good (even better) that the last one.

Code: Select all

# --------
# HD 98800
# --------

Barycenter 55505 "HD 98800"
   {
   RA      170.52204083
   Dec      -24.8771
   Distance   152.288
   }


Barycenter "HD 98800 A"
   {
   OrbitBarycenter   "HD 98800"
   EllipticalOrbit
      {
      Period      300 # est.
      SemiMajorAxis   46.44
      Eccentricity   0.10 # plausible guess
      Inclination      19.89
      ArgOfPericenter   0.00
      }
   }

"HD 98800 Aa"
   {
   OrbitBarycenter      "HD 98800 A"
   SpectralType      "K0V"
   AppMag         9.1
   EllipticalOrbit
      {
      Period          252.1
      SemiMajorAxis   2.97   # mass ratio 0.5:0.2
      Eccentricity   0.041
      Inclination   84.4
      AscendingNode   215.2
      ArgOfPericenter 90.4
      MeanAnomaly     214.77
      }
   }

"HD 98800 Ab"
   {
   OrbitBarycenter      "HD 98800 A"
   SpectralType      "K2V"
   AppMag         9.54
   EllipticalOrbit
      {
      Period          252.1
      SemiMajorAxis   2.97   # mass ratio 0.5:0.2
      Eccentricity   0.041
      Inclination   84.4
      AscendingNode   215.2
      ArgOfPericenter 270.4
      MeanAnomaly     214.77
      }
   }


Barycenter "HD 98800 B"
   {
   OrbitBarycenter   "HD 98800"
   EllipticalOrbit
      {
      Period      300 # est.
      SemiMajorAxis   46.66
      Eccentricity   0.10 # plausible guess
      Inclination      19.89
      ArgOfPericenter   180.00
      }
   }

"HD 98800 Ba"
   {
   OrbitBarycenter   "HD 98800 B"
   SpectralType   "K5V"
   AppMag      10.5
   EllipticalOrbit
      {
      Period      0.02743
      SemiMajorAxis   0.19
      Eccentricity   0.02
      Inclination      25.00
      ArgOfPericenter   0.00
      }
   }

"HD 98800 Bb"
   {
   OrbitBarycenter   "HD 98800 B"
   SpectralType   "K7V"
   AppMag      11.9
   EllipticalOrbit
      {
      Period      0.02743
      SemiMajorAxis   0.20
      Eccentricity   0.02
      Inclination      25.00
      ArgOfPericenter   180.00
      }
   }


[JamesGarry]

HD 98800 is a multiple star system about 150 light years from Earth -- right in our section of the Milky Way Galaxy. For years it has been known that HD 98800 consists of two pairs of double stars, with one pair surrounded by a disk of dust. Recent data from the Earth-trailing Spitzer Space Telescope in infrared light indicate that the dust disk has gaps that appear consistent with being cleared by planets orbiting in the disk. If so, one planet appears to be orbiting at a distance similar to Mars of our own Solar System. Pictured above is an artist's drawing of how the HD 98800 system might appear to a nearby observer.

[t00fri]

HD 98800 is a multiple star system about 150 light years from Earth -- right in our section of the Milky Way Galaxy. For years it has been known that HD 98800 consists of two pairs of double stars, with one pair surrounded by a disk of dust. Recent data from the Earth-trailing Spitzer Space Telescope in infrared light indicate that the dust disk has gaps that appear consistent with being cleared by planets orbiting in the disk. If so, one planet appears to be orbiting at a distance similar to Mars of our own Solar System. Pictured above is an artist's drawing of how the HD 98800 system might appear to a nearby observer.

It would be much preferable if you'd quote one of the many possible links from where this paragraph was literally copied by you! Copying material written by others without giving credit to them is bad style and also not very useful.

Here are a couple of links, where the above paragraph might have been taken from:

NASA:
http://www.nasa.gov/multimedia/imagegal ... e_884.html
EYES:
http://living-creatures.blogspot.com/20 ... 98800.html

There people could even have admired the nice display of the system (artist impression)!

Fridger