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COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 08 Sep 2017 02:12
by Zeryphex
Mosfet wrote:
Well, usually such fixes are indeed included in next versions, that's the point of this thread as stated in the original post :)

I only recently downloaded and became acquainted with SpaceEngine, so I am a newbie.
KIC 9832227 was featured in a news article that I came-across ... and if JackDole had uploaded a version of KIC 9832227 for SpaceEngine, eight months ago, why was I not able to find that binary star system, recently?

COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 08 Sep 2017 02:49
by Mosfet
You mean in the program? Most of data about stars used in SE are from HIPPARCOS database which does not contain specifically info on binary stars, those have to be treated differently, by scripts as these ones above. But Space Engine does not have (yet) some automatic update feature for data. Space Engine 0980 data about binary stars are from July 2016, when this version was made available, so that's why you didn't find the star.
A patch recently published, 0980e, while adopting new algorithms for precise solar system orbits, it also came with updated data sets, but it has to be manually installed, as well as the others addons/fixes.

COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 08 Sep 2017 03:14
by Zeryphex
Mosfet wrote:
You mean in the program? Most of data about stars used in SE are from HIPPARCOS database which does not contain specifically info on binary stars, those have to be treated differently, by scripts as these ones above. But Space Engine does not have (yet) some automatic update feature for data. Space Engine 0980 data about binary stars are from July 2016, when this version was made available, so that's why you didn't find the star.
A patch recently published, 0980e, while adopting new algorithms for precise solar system orbits, it also came with updated data sets, but it has to be manually installed, as well as the others addons/fixes.

I will just wait for SpaceEngineer to determine which variant of KIC 9832227 he wants to include, in the next SpaceEngine version ... between the JackDole measurements/calculations or the Mosfet measurements/calculations ... or average of the two ... or SpaceEngineer's own variant of KIC 9832227.
haha

COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 08 Sep 2017 05:09
by JackDole
KIC 9832227 (Boomstar)

I post here again my version of 'KIC 9832227'
// Name: KIC_9832227.sc
// JackDole 2017.09.08 12:49:05

//------------------------------------------------------------------------------
// https://arxiv.org/pdf/1704.05502.pdf
//------------------------------------------------------------------------------

StarBarycenter "KIC 9832227"
{
    RA      19 29 15.954
    Dec     46 37 19.88
    Dist    565
    
    MassSol 1.714
}

//------------------------------------------------------------------------------

(Put script in 'addons\catalogs\stars')
// Name: KIC_9832227.sc
// Comment: Merger 2022
// JackDole 2017.09.08 12:50:39

//------------------------------------------------------------------------------
// https://arxiv.org/pdf/1704.05502.pdf
//------------------------------------------------------------------------------

Star "KIC 9832227 A"
{
    ParentBody  "KIC 9832227"
    Class       "G4 V"
    
    RadSol      1.581
    MassSol     1.395
    
    Lum         2.609
    FeH         0.101
    Teff        5800
    
    Orbit
    {
        SemiMajorAxis   0.00258512
        Period          0.0012538570918877
        Eccentricity    0
        Inclination     53.2
        AscendingNode   0
        MeanAnomaly     0
        ArgOfPericenter 0
    }
}

Star "KIC 9832227 B"
{
    ParentBody  "KIC 9832227"
    Class       "G1 V"
    
    RadSol      0.830
    MassSol     0.318
    
    Lum         0.830
    FeH         0.101
    Teff        5920
    
    Orbit
    {
        SemiMajorAxis   0.01134038
        Period          0.0012538570918877
        Eccentricity    0
        Inclination     53.2
        AscendingNode   0
        MeanAnomaly     0
        ArgOfPericenter 180
    }
}

//------------------------------------------------------------------------------

(Put script in 'addons\catalogs\planets')
scr00086 (2).png
(The picture is from SE 0.971)
KIC9832227.pak
(1.33 KiB) Downloaded 204 times
(Put this in 'addons')

COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 22 Sep 2017 12:46
by JackDole
AR Scorpii - First white dwarf-pulsar

Image
Star’s intense radiation beams whip neighbouring red dwarf
// Filename: AR_Sco_BC.sc
// Comment: First white dwarf-pulsar
// JackDole 2017.09.22 18:21:56

// Put file in 'addons\catalogs\stars'

// http://simbad.u-strasbg.fr/simbad/sim-id?Ident=AR+Scorpii
// https://en.wikipedia.org/wiki/AR_Scorpii
// http://variablestars.net/stars/40650/
//------------------------------------------------------------------------------

StarBarycenter "V* AR Sco/AR Scorpii/AR Sco/2MASS J16214728-2253102"
{
    RA      16 21 47.288
    Dec     -22 53 10.40
    Dist    116.0
    
    Class   "M5"
    AppMagn 14.3        // 14.1 - 14.6
}

//------------------------------------------------------------------------------

// Filename: AR_Sco.sc
// Comment: First white dwarf-pulsar
// JackDole 2017.09.22 18:26:45

// Put file in 'addons\catalogs\planets'

// http://simbad.u-strasbg.fr/simbad/sim-id?Ident=AR+Scorpii
// https://en.wikipedia.org/wiki/AR_Scorpii
// http://variablestars.net/stars/40650/
// https://arxiv.org/pdf/1607.08265.pdf
// http://cdn.sci-news.com/images/enlarge3/image_4059e-AR-Scorpii.jpg
//------------------------------------------------------------------------------

Star "AR Scorpii A/AR Sco A/2MASS J16214728-2253102 A"
{
    ParentBody  "AR Sco"
    Class       "DA"
    
    MassSol     1.29     // 0.81 - 1.29
 
    AccretionDisk
    {
        InnerRadius     7.7611e-005
        OuterRadius     0.000880202
        AccretionRate   1.85223e-030
        Temperature     396474
        Density         5.93678e+006
        Luminosity      0.000483706
        TwistMagn       2.5
        Brightness      1
    }

    Orbit
    {
        Period          0.00040612      // 3.56 h
        Eccentricity    0.0     // no data
        Inclination     0.0     // no data
        AscendingNode   0.0     // no data
        ArgOfPericenter 0.0     // no data
        MeanAnomaly     0.0     // no data
        Epoch           2444025.413
    }
}

Star "AR Scorpii B/AR Sco B/2MASS J16214728-2253102 B"
{
    ParentBody  "AR Sco"
    Class       "M5 V"
    
    MassSol     0.45    // 0.28 - 0.45
 
    Orbit
    {
        Period          0.00040612      // 3.56 h
        Eccentricity    0.0     // no data
        Inclination     0.0     // no data
        AscendingNode   0.0     // no data
        ArgOfPericenter 180.0   // no data
        MeanAnomaly     0.0     // no data
        Epoch           2444025.413
    }
}

//------------------------------------------------------------------------------

scr00088.png
(The picture is from SE 0.971)
scr00021.png
(In SE 0.980 the white dwarf has an accretion disk.)
AR_Sco_BC.sc
(628 Bytes) Downloaded 322 times
(Put in 'addons\catalogs\stars')
AR_Sco.sc
(1.78 KiB) Downloaded 307 times
(Put in 'addons\catalogs\planets')

COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 22 Sep 2017 13:26
by A-L-E-X
Wow thanks, Jack, I think I have your Boom Star pak from earlier (is this the same one?)  Also, I remember asking you about Tabby's Star but it was not compatible with 0.980  Do we have one that is compatible with the patch?

Also, I have a little issue with accretion disks I need to ask about.  Mine do not "move" or "swirl."  Is this a consequence of setting Black Holes to "low"settings?

COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 22 Sep 2017 16:25
by JackDole
A-L-E-X wrote:
Source of the post I think I have your Boom Star pak from earlier (is this the same one?

I do not know exactly, maybe it's something changed.

A-L-E-X wrote:
Source of the post I remember asking you about Tabby's Star

Here is Tabby's star.

A-L-E-X wrote:
Source of the post Also, I have a little issue with accretion disks I need to ask about.

The two stars are tide locked. As a result, the accretion disk also rotates slowly. Once in about 3.5 hours. If you accelerate the time something, it should turn. I do not know if that is realistic, in any case, it is what SpaceEngine makes of it.

COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 22 Sep 2017 17:26
by A-L-E-X
Thanks Jack.  I think I saw you say you were going to make Dyson Spheres for the add-on? Should I just wait until then?

Also about the accretion disk, it happens with Sgr A also. How slowly should that one rotate?

I downloaded the Boom Star add-on in March, is this one more recent?

COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 22 Sep 2017 20:24
by DoctorOfSpace
A-L-E-X wrote:
Source of the post Should I just wait until then?

That is what I am doing, I was unable to update his mods properly.  Hopefully he gets a new PC soon :(

COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 23 Sep 2017 00:38
by A-L-E-X
DoctorOfSpace wrote:
A-L-E-X wrote:
Source of the post Should I just wait until then?

That is what I am doing, I was unable to update his mods properly.  Hopefully he gets a new PC soon :(

Me too.  He is an awesome contributor here.  If it's a question of funding (which I can understand, sometimes I put PC upgrades on the back burner because last year I was having a new roof put on my house and had to redo one of my bathrooms and the work ended up extending into this year), I wish he had a Gofundme page some of us could contribute to.

COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 23 Sep 2017 05:48
by JackDole
A-L-E-X wrote:
Source of the post is this one more recent?

Yes.

DoctorOfSpace wrote:
Source of the post That is what I am doing, I was unable to update his mods properly.

The question is, however, whether it is still worth updating these things before version 0.990 is released.

COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 23 Sep 2017 10:07
by DoctorOfSpace
JackDole, it would be worth it if you can find a good deal 

COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 05 Sep 2018 10:22
by Cirax
Update of Luhman 16 binary brown dwarf system.  Now orbit parameters are a lot of more complete: article for download

Stars

StarBarycenter "Luhman 16/LUH 16/WISE J104915.57-531906.1/DENIS-P J104919.0-531910/2MASS J10491891-5319100/IRAS Z10473-5303"
{
    RA      10 49 18.723
    Dec     -53 19 9.86
    Dist    1.9988
}


Planets

Star "Luhman 16 A"
{
    ParentBody "Luhman 16"
    Class      "L7.5"
    MassSol    0.032
    Luminosity 0.0000219
    Teff       1350
    Obliquity  0        //unknown, just avoiding extreme values
    Orbit
    {
        Period          27.54
        SemiMajorAxis   1.638166
        Eccentricity    0.343
        Inclination     100.26
        AscendingNode   139.67
        ArgOfPericenter 128.1
        Epoch           2458038.54
        MeanAnomaly     0
    }
}

Star "Luhman 16 B"
{
    ParentBody "Luhman 16"
    Class      "T0.5"
    MassSol    0.0273
    Luminosity 0.0000209
    Teff       1210
    Obliquity  0 //unknown, just avoiding extreme values
    Orbit
    {
        Period          27.54
        SemiMajorAxis   1.918834
        Eccentricity    0.343
        Inclination     100.26
        AscendingNode   139.67
        ArgOfPericenter 308.1
        Epoch           2458038.54
        MeanAnomaly     0
    }
}


In a .pak file for the addons folder with commented credits: 
Luhman16-upd2018.pak
(1.93 KiB) Downloaded 166 times

COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 25 Mar 2019 02:49
by PlutonianEmpire
I'm surprised Al Rescha (ALF PSC) hasn't been caught yet; I couldn't immediately find anything in the search function. Sneaky fella is on the wrong side of the Equator in 0.980. It's Dec should be +2, but it is Dec -2 instead. I couldn't figure out how to transfer all the names without triggering some duplicity bug, but here's a partial fix. Works ONLY in 0.980. It's wonky in e.

COMMUNITY ADDON - binary/multiple stars fixes for SE

Posted: 08 Jun 2019 12:41
by SquillionthPlanet
Ooh, glad you made this. Thanks!!