OHM Makemake

[OrbitHangar]

Author: etudiant spatial

Minor Planet Makemake

This add-on contains the minor planet Makemake.

Read the read-me.txt file! It's very important.

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Planète naine Makemake

Cet add-on contient la planète naine Makemake

Lisez le fichier lisez-moi.txt! C'est très important.

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[JonnyBGoode]

The orbital parameters for this addon are way off. The entries are in degrees, but the units are in radians. Change the orbital parameters to these, to fix the problem:

Eccentricity = 0.15586
Inclination = 0.50626503813   ; rad
LongAscNode = 1.3861405        ; rad
LongPerihelion = 5.1766466       ; rad
MeanLongitude = 0.072780282168         ; rad

 

[downloaderfan]

Just so you know, there is a huge difference in the author's Longitude of Perihelion value (245.85)which you converted into radians & wikipedia's value. (297.24) The Longitude of Perihelion values for Quaoar & Varuna when compared with wikipedia are nearly identical.

 

[JonnyBGoode]

So the 4.29089197 figure is wrong?

 

[downloaderfan]

So the 4.29089197 figure is wrong?

Yup, this is another website where I found the longitude of periapsis value to be 296.6. That website seems pretty reliable to me.

 

[JonnyBGoode]

296.6 degrees? k that would figure to 5.1766466 rad, then.

 

[downloaderfan]

296.6 degrees? k that would figure to 5.1766466 rad, then.

Yeah, I sorta told you about this so that you could edit your original post above with that value. :hello:

 

[JonnyBGoode]

That just occurred to me, lol :rofl:

 

[cristiapi]

Afaik, the only data available for Makemake from accurate numerical integration are here:
ftp://quasar.ipa.nw.ru/incoming/EPM/

From those data I get:

Epoch         = 2005.67        ; Orbital element reference epoch (e.g. 2000)
ElReference   = Ecliptic       ; ParentEquator or Ecliptic: orbit reference frame
SemiMajorAxis = 6842599573954  ; Orbit semi-major axis [m]
Eccentricity  = 0.154600156    ; Orbit eccentricity
Inclination   = 0.506130353    ; Orbit inclination against reference plane [rad] (28.9991 deg)
LongAscNode   = 1.38790989     ; Longitude of ascending node [rad] (79.5214 deg)
LongPerihelion= 0.283563275    ; Longitude of periapsis [rad] (16.247 deg), Argument of periapsis= 296.726 deg
MeanLongitude = 2.83456486     ; Mean longitude at epoch [rad] (162.409 deg), Mean anomaly= 146.162 deg

 

[downloaderfan]

Afaik, the only data available for Makemake from accurate numerical integration are here:
ftp://quasar.ipa.nw.ru/incoming/EPM/

From those data I get:

Epoch         = 2005.67        ; Orbital element reference epoch (e.g. 2000)
ElReference   = Ecliptic       ; ParentEquator or Ecliptic: orbit reference frame
SemiMajorAxis = 6842599573954  ; Orbit semi-major axis [m]
Eccentricity  = 0.154600156    ; Orbit eccentricity
Inclination   = 0.506130353    ; Orbit inclination against reference plane [rad] (28.9991 deg)
LongAscNode   = 1.38790989     ; Longitude of ascending node [rad] (79.5214 deg)
LongPerihelion= 0.283563275    ; Longitude of periapsis [rad] (16.247 deg), Argument of periapsis= 296.726 deg
MeanLongitude = 2.83456486     ; Mean longitude at epoch [rad] (162.409 deg), Mean anomaly= 146.162 deg

This seems right when compared to some other astronomy apps I have, please also find accurate orbital parameters for Quaoar & Varuna if your time permits that.

 

[cristiapi]

My time permits that, but those bodies are not in the data files.

 

[downloaderfan]

My time permits that, but those bodies are not in the data files.

Yeah, I saw that, but I thought you may know some other source which has that information. I just want to be sure that the orbital parameters of quaoar & varuna are correct and I certainly don't have the ability to do that myself.

 

[cristiapi]

You could use this reliable site:
http://ssd.jpl.nasa.gov/sbdb.cgi