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 Post subject: Sgr A sagitterius A*
PostPosted: Wed, 12-04-17, 8:03 GMT 
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https://en.wikipedia.org/wiki/Sagittarius_A*

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 Post subject: Re: Sgr A sagitterius A*
PostPosted: Thu, 13-04-17, 20:20 GMT 
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 Post subject: Re: Sgr A sagitterius A*
PostPosted: Fri, 14-04-17, 8:05 GMT 
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Code:
#http://orbitsimulator.com/formulas/sma.html
#https://en.wikipedia.org/wiki/Sagittarius_A
#https://en.wikipedia.org/wiki/Sagittarius_A*

"sgr A:Sagittarius A"
{
   RA       266.404167
   Dec      -28.936111
   Distance 27720.000000
   AppMag       25
   SpectralType "?"
   Radius    44000000  #black Hole (63 R_sun)
   mass      4060000 #M_Sun
}


Barycenter "Sagittarius A"
{
   RA       266.404167
   Dec      -28.936111
   Distance 27720.000000
}

 
"S1"
{
   OrbitBarycenter "Sagittarius A"
   SpectralType "?"
   AppMag 25.445
 
    EllipticalOrbit {
   Epoch          2452463.7 #2002.6
    Period              94.1 
    SemiMajorAxis     3300.4241578113324
    Eccentricity         0.358
    Inclination        120.5
    AscendingNode      341.500
    ArgOfPericenter    129.800
    MeanAnomaly          0.000
    }
}

"S2"
{
   OrbitBarycenter "Sagittarius A"
   SpectralType "?"
   AppMag 25.445
 
    EllipticalOrbit {
   Epoch            2452359.105
    Period              15.24 
    SemiMajorAxis      980.6182835483514
    Eccentricity         0.8760
    Inclination          131.9
    AscendingNode      221.9
    ArgOfPericenter     62.6
    MeanAnomaly          0.000
    }
}

"S8"
{
   OrbitBarycenter "Sagittarius A"
   SpectralType "?"
   AppMag 25.445
 
    EllipticalOrbit {
   Epoch          2447025.07
    Period              67.2 
    SemiMajorAxis     2636.8748847113447
    Eccentricity         0.927
    Inclination         60.6
    AscendingNode      141.4
    ArgOfPericenter    159.2
    MeanAnomaly          0.000
    }
}

"S12"
{
   OrbitBarycenter "Sagittarius A"
   SpectralType "?"
   AppMag 25.445
 
    EllipticalOrbit {
   Epoch          2449916.976
    Period              54.4 
    SemiMajorAxis     2290.389134967171
    Eccentricity         0.9020
    Inclination          32.8
    AscendingNode        233.3
    ArgOfPericenter      311.8
    MeanAnomaly          0.000
    }
}

"S13"
{
   OrbitBarycenter "Sagittarius A"
   SpectralType "?"
   AppMag 25.445
 
    EllipticalOrbit {
   Epoch          2453742.2
    Period              36 
    SemiMajorAxis     1739.3153998781474
    Eccentricity         0.395
    Inclination          11
    AscendingNode        100
    ArgOfPericenter      250
    MeanAnomaly          0.000
    }
}

"S14"
{
   OrbitBarycenter "Sagittarius A"
   SpectralType "?"
   AppMag 25.445
 
    EllipticalOrbit {
   Epoch          2451570.752
    Period              38 
    SemiMajorAxis     1803.1522831560787
    Eccentricity         0.9389
    Inclination          97.3
    AscendingNode        228.5
    ArgOfPericenter      344.7
    MeanAnomaly          0.000
    }
}


Last edited by symaski62 on Mon, 17-04-17, 11:10 GMT, edited 3 times in total.

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 Post subject: Re: Sgr A sagitterius A*
PostPosted: Sun, 16-04-17, 7:39 GMT 
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It would be very useful to also display --besides the Wiki reference-- the links to the original scientific papers (2005) for the above orbital parameters:

http://iopscience.iop.org/article/10.1086/427175/pdf
http://iopscience.iop.org/article/10.1086/430667/pdf

I remember that essentially the complete set of required orbital parameters may be found in there (A. M. Ghez et al., F. Eisenhauer et al.)

Thanks,
Fridger

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 Post subject: Re: Sgr A sagitterius A*
PostPosted: Mon, 17-04-17, 9:04 GMT 
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:shock: incroyable ! image

;)


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 Post subject: Re: Sgr A sagitterius A*
PostPosted: Mon, 17-04-17, 9:17 GMT 
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Right, that's how I remember this marvelous view from when the original papers appeared in 2005.

Fridger

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 Post subject: Re: Sgr A sagitterius A*
PostPosted: Mon, 17-04-17, 9:59 GMT 
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t00fri wrote:
It would be very useful to also display --besides the Wiki reference-- the links to the original scientific papers (2005) for the above orbital parameters:

http://iopscience.iop.org/article/10.1086/427175/pdf => Receivved 2003 June 5; accepted 2004 October 29
http://iopscience.iop.org/article/10.1086/430667/pdf => Received 2005 February 6; accepted 2005 March 15

I remember that essentially the complete set of required orbital parameters may be found in there (A. M. Ghez et al., F. Eisenhauer et al.)

Thanks,
Fridger


;)

yes, mass 4060000 M_Sun = 4.06e6 M_Sun

http://orbitsimulator.com/formulas/sma.html


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 Post subject: Re: Sgr A sagitterius A*
PostPosted: Mon, 17-04-17, 13:22 GMT 
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M0 = 4.06e6 M_Sun #black hole

;)


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sgrA1.png
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 Post subject: Re: Sgr A sagitterius A*
PostPosted: Mon, 17-04-17, 17:53 GMT 
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symaski62 wrote:
M0 = 4.06e6 M_Sun #black hole
[By all means click on image]
Attachment:
sgrA1.png
sgrA1.png [ 90.53 KiB | Viewed 97 times ]

;)


Yes that's what I recalled, whence we can do a nice .stc file for the system...
When the orbital data became available around 2005, I made an add-on, but forgot where I made it public. For sure not in the Motherlode, hence presumably in the shatters.net forum, since the CelestialMatters forum did not yet exist;-)

Fridger

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