Planet b around proxima centauri !

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Cham M
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#1by Cham » 24.08.2016, 20:42

We already need to make an addon for this ! This is too great to miss in Celestia ! :smile:

http://physicsworld.com/cws/article/news/2016/aug ... -around-suns-nearest-neighbour

Nice little video on YouTube :

https://www.youtube.com/watch?v=pJWZ7ikJR2k
Last edited by Cham on 24.08.2016, 21:01, edited 1 time in total.
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#2by omega13a » 24.08.2016, 20:59

I already posted about this in the Physics/Astronomy forum but I agree, someone needs to make this add-on ASAP.
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Cham M
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#3by Cham » 24.08.2016, 21:06

I'm pasting a template here. Currently, I don't have time to make it all yet.

Code: Select all

"b" "Proxima"
{
   Texture "asteroid.jpg"
   Mass ??  # M.sin(i) = ?? earths
   Radius ??

   EllipticalOrbit {
      Period      ??
      SemiMajorAxis   ??
      MeanLongitude   ??
      Inclination   ??
   }

   UniformRotation {
      Period      ?? # hours
      Inclination   ??
      AscendingNode   ??
      MeridianAngle   ??
   }
}
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omega13a M
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#4by omega13a » 24.08.2016, 21:16

Here's the details for the planet that I could find: https://en.wikipedia.org/wiki/Proxima_Centauri#Planetary_system

Unfortunately, it doesn't include inclination and mean longitude and the radius is a guess based on the assumption its composition is similar to the Earth...
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#5by SVision » 24.08.2016, 22:16

Cham wrote:We already need to make an addon for this ! This is too great to miss in Celestia !
Cham wrote:I'm pasting a template here. Currently, I don't have time to make it all yet.
OK Cham. Here is my version of the add-on as a super Mars. :smile:
Image
Image
Image

Code: Select all

"Uncifomied b:b" "V 645 Cen"
{
   Texture "MarsType.*"
   NormalMap "MarsTypeNormal.*"
   Radius     7821#=1.23 RE.Super Mars type
   Mass       2.00
   #AbsMag    38.36#Mayde
   
   InfoURL "https://palereddot.org/"
   
   BodyFrame { EclipticJ2000 {} }

   EllipticalOrbit {
      Period          0.03469 #=12.671 d
      SemiMajorAxis   0.06#8976000 km
      Eccentricity    0.0
      #OV             51.5
   }
   
        Atmosphere
      {
      Height       400
      Lower [ 0.8 0.6 0.6 ]
      Upper [ 0.7 0.3 0.3 ]
      Sky [ 0.83 0.75 0.65 ]
      Sunset [ 0.7 0.7 0.8 ]
      CloudHeight 50
      CloudSpeed 156
      CloudMap "15h-clouds.*"
      Mie       0.0001
      MieAsymmetry    -0.1
      Rayleigh       [ 0.007 0.007 0.008]
      MieScaleHeight    20
      }   
   
       RotationPeriod 14.00      
}


Did I have it another 5 June this year based on Pal Red Dot data. It seems not bad but I think not very believable, and so I will change after the release of this addon exoplanet transit. And that's why:
Although I doubt that will give life to Proxima Cen b . The star is very active and probably life can kill by radiation. Personally, I think the last time the world analogue of Venus :sad: . In any case, we should wait for the new results and even 100% sure that this planet is real, and the stars activity or even a glitch instruments such as unfortunately is often the case repeatedly. For example A Cen Bb .
Added after 5 minutes 17 seconds:
And in any case, I still have a long time to work on this world. I described how it in Russian forum that incorrectly calculated the period taking as a basis the signal 12,671 days, but in fact it is not. Moreover, in reality, the planet will likely ebb in sync which is not in my case.

Added after 16 minutes 14 seconds:
Probably it oftop although also to some extent to have planetary systems rendering red and orange dwarfs later. But I want to get rid of it in the Celestia improbable pinkish hue. How can I do that ? :help:
Last edited by SVision on 25.08.2016, 04:40, edited 1 time in total.

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#6by omega13a » 24.08.2016, 23:45

But it is still exciting to have something so close to our solar system. At best I think it would probably be home to extrememophiles.
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#7by Chuft-Captain » 25.08.2016, 00:13

I heard that it is home to a species of 9ft tall war-mongering cats. :wink:
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#8by SVision » 25.08.2016, 05:40

omega13a wrote:At best I think it would probably be home to extrememophiles.
It is this and really would like to, but alas, most likely in reality it is a lifeless desert. I still doubt the life of the chromospheric activity of red dwarfs. It's like living next to a nuclear bomb :sad: . But in any case this is a very important discovery for us.
We now know that in fact, the world has almost all the stars and more likely to find in one way or another star of the terrestrial planets in the habitable zone (assuming that the system no gas giants on the inner orbits). By the way. By the way candidates falls and Alpha Centauri A .Here is interesting recent information on the (possible) the evolution of the Alpha Centauri A system :wink:

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#9by nardo » 25.08.2016, 07:09

here's what i'm currently using, if you're interested.

Code: Select all

"Proxima b:b" "Proxima"
{
   Texture      "asteroid.*"      # light from proxima makes a good "cooked on one side" effect
   Radius      7008.1            # at least 1.1 earth radii
   EllipticalOrbit
   {
      Period         0.03062560   # 11.186 days
      SemiMajorAxis   0.05      # AU
      Eccentricity   0         # <.35
      Inclination      0         # unknown, most likely doesn't cross star
   }
   BodyFrame                  # most likely tidally locked
   {
      TwoVector
      {
         Center "Proxima/b"
         Primary
         {
            Axis "x"
            RelativePosition { Target "Proxima" }
         }
         Secondary
         {
            Axis "y"
            RelativeVelocity { Target "Proxima" }
         }
      }
   }
}

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#10by John Van Vliet » 26.08.2016, 00:01

planets and moons use different units
AU vs Km
earth years VS earth days

some builds can use a < diffination > but i have not used that

Code: Select all

"B" "Proxima Cen" 
{
       
    Class "planet"
    Texture "4k.basergb4.png" 
    NormalMap "4kNorm.png"
    SpecularTexture "4k.basespec.png"
    SpecularColor [ 0.25 0.2 0.2 ]
   SpecularPower 12.0
   #Mass      2     
   Radius     6800
   Oblateness    0.01
   
 
 
        Atmosphere {
      Height 60
      Lower [ 0.65 0.55 0.5 ]
      Upper [ 0.7 0.5 0.5 ]
      Sky [ 0.8 0.4 0.6 ]
      Sunset [ 1.0 0.5 0.25 ]

      CloudHeight 30
      CloudSpeed 930
      CloudMap "Cloud1234.png"
     

        Mie 0.001
      MieAsymmetry -0.25
      Rayleigh [ 0.004 0.0025 0.002 ]
      MieScaleHeight 12
   }

   EllipticalOrbit {
      Eccentricity          0.35   
      AscendingNode         1
      SemiMajorAxis         0.0485
      ArgOfPericenter       1
      MeanAnomaly           1
      Inclination           40
      Period                0.0306
      }
               
  UniformRotation
    {
       Period         177 #hours
       Inclination    38
       AscendingNode  15.0
       MeridianAngle  0.0

    }

   
}



the textures are 2k reduced size
Image Image Image

Image Image Image
Last edited by John Van Vliet on 26.08.2016, 05:05, edited 6 times in total.

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#11by omega13a » 26.08.2016, 00:36

Here's the SSC stuff for the planet based on what data I've been able to find.

Code: Select all

"b" "Proxima"
{
   Texture "venuslike.jpg"
   Mass 1.3  # M.sin(i) = ?? earths
   Radius 7143.51344

   EllipticalOrbit {
      Period      0.03063604704645508903
      SemiMajorAxis   0.0485
      Eccentricity 0.35
      MeanLongitude   310
      Inclination   0
   }

   UniformRotation {
      Period      179.04 # Given its eccentric orbit, it probably has a spin/orbit resonance like Mercury
      Inclination  0
      AscendingNode   0
      MeridianAngle  310
   }
}
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Cham M
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#12by Cham » 26.08.2016, 01:00

omega13a wrote:Here's the SSC stuff for the planet based on what data I've been able to find.

Geez ! The precision of the Radius and Period is absurd ! :fie:
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#13by omega13a » 26.08.2016, 04:05

Cham wrote:Geez ! The precision of the Radius and Period is absurd ! :fie:
What can I say? I like things to be exact. :wink:
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#14by Cham » 26.08.2016, 11:33

omega13a wrote:What can I say? I like things to be exact.
This isn't exact at all. It is just the illusion of precision. Scientifically, this is pure non-sense ! You should learn the proper significant digits to get something valuable:

https://en.wikipedia.org/wiki/Significant_figures
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#15by John Van Vliet » 26.08.2016, 16:08

sig figs

learned them in high-school chemistry

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#16by PlutonianEmpire » 28.08.2016, 17:46

You and me both, Omega. :) I quite dislike rounding, especially in science. My personal preference is 6 places past the decimal point. Better than 12.34, for example. :)
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#17by John Van Vliet » 28.08.2016, 18:40

6 places
but what if the error bars only give you 1 or 2 sig figs

1.2
1.23
1.234
1.2345

that 1.2 IS!!!! the MOST important number in the list ( it is NOT!! 1.20 )

now i am NOT being a prof. or TA here ( my nephew now IS a prof.!!! yhaa !, assistant prof. but getting there )
so i have never forced 100% exact numerical presentation

but some common sense here please

even the numbers i place in the spice ssc's have TOO MANY places
-- it is easier to "copy / paste" ( 4.698342892808841E-03 ) form horizons
or use a non edited value in a perl script without converting it to 0.004698

i would need to check the source code but i believe a float with 8 places is used to calculate the orbits

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#18by PlutonianEmpire » 28.08.2016, 20:36

After reading your post and skimming the article on sig figs, I definitely need to relearn sig figs and scientific notation. :oops:
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#19by selden » 28.08.2016, 21:09

When displaying many objects (for example, stars in a cluster) if you provide only the minimum valid precision, then they'll seem to align with one another in sheets or on a grid, which is itself very non-physical. The additional digits can be used to provide a random displacement for each of the objects so those alignments don't happen.
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#20by omega13a » 28.08.2016, 22:28

selden wrote:When displaying many objects (for example, stars in a cluster) if you provide only the minimum valid precision, then they'll seem to align with one another in sheets or on a grid, which is itself very non-physical. The additional digits can be used to provide a random displacement for each of the objects so those alignments don't happen.
I've lost track of how many add-ons have that problem (including many of my early ones) but its only noticeable for objects that have a long orbital period.
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