C/2001 Q4

General physics and astronomy discussions not directly related to Celestia
Topic author
symaski62

C/2001 Q4

Post #1by symaski62 » 29.04.2004, 11:42

Code: Select all

"C/2001 Q4" "Sol"
{
  Class      "comet"
  Texture    "asteroid.jpg"
  Mesh       "asteroid.cms"
  Radius      ????

  EllipticalOrbit
  {
    Period                 ????
    SemiMajorAxis          ????
    Eccentricity           1.000522818
    Inclination            99.6423878
    AscendingNode          210.2786496
    ArgOfPericenter        1.207514
    MeanAnomaly            359.9997506
    Epoch                  2453141.4684405
  }
}


http://neo.jpl.nasa.gov/cgi-bin/db_shm?sstr=C%2F2001+Q4&group=all
merci i am french

granthutchison
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Post #2by granthutchison » 29.04.2004, 15:57

Code: Select all

"C/2001 Q4" "Sol"
{
  Class      "comet"
  Texture    "asteroid.jpg"
  Mesh       "asteroid.cms"
  Radius      5 #???

  EllipticalOrbit
  {
    Period                 78923.351
    PericenterDistance     0.961953788     
    Eccentricity           1.000522818
    Inclination            99.6423878
    AscendingNode          210.2786496
    ArgOfPericenter        1.207514
    MeanAnomaly            0
    Epoch                  2453141.4684405
  }
}


http://www.lns.cornell.edu/~seb/celestia/transforming_ephemeris.html

Grant

Topic author
symaski62

Post #3by symaski62 » 29.04.2004, 17:23

Period #calculated: (q/(1-e))**1.5


:?:

granthutchison
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Post #4by granthutchison » 29.04.2004, 18:04

symaski62 wrote:Period #calculated: (q/(e-1))**1.5
Mean motion (n) for hyperbolic orbits = ((e-1)/q)^1.5

"Period" used by Celestia is the inverse of mean motion.

Grant
Last edited by granthutchison on 29.04.2004, 22:25, edited 2 times in total.

Topic author
symaski62

Post #5by symaski62 » 29.04.2004, 19:50

je suis mal

((1-1.000522818)/0.961953788)^1.5 = error

moi fran?ais


merci

granthutchison
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Post #6by granthutchison » 29.04.2004, 21:03

Je m'excuse – pour des orbites hyperboliques c'est (1-e), pas (e-1).

Grant

Topic author
symaski62

Post #7by symaski62 » 29.04.2004, 21:37

error VU rien

je vois l'ordinature avec "calc"


((1-Eccentricity)/PericenterDistance)^1.5

((1-1.000522818)/0.961953788)^1.5

((-0.000522818)/0.961953788)^1.5

-5.434959626^1.5 = -12.67052130


VU

granthutchison
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Post #8by granthutchison » 29.04.2004, 22:43

Aaargh! J'avais raison la primi?re fois - c'est (e-1) pour des orbites hyperboliques:

(PericenterDistance/(Eccentricity-1))^1.5

= (0.961953788/0.000522818)^1.5

= 1839.940071^1.5

= 78923.351 (ann?es)

Grant

Guest

Post #9by Guest » 29.04.2004, 22:57

merci beaucoup!!!!

Topic author
symaski62

Post #10by symaski62 » 30.04.2004, 07:52

merci beaucoup!!

Guest

Post #11by Guest » 16.05.2004, 00:07

Does anybody took a picture (or more) of C/2001 Q4 in the last days?

ElPelado
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Contact:

Post #12by ElPelado » 16.05.2004, 08:12

There are many pictures in teh internet
here you have one:
Image
---------X---------
EL XENTENARIO
1905-2005

My page:
http://www.urielpelado.com.ar
My Gallery:
http://www.celestiaproject.net/gallery/view_al ... y-Universe

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Adirondack M
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Post #13by Adirondack » 18.05.2004, 12:00

Does anybody took a picture (or more) of C/2001 Q4 in the last days?

Well, as I understand the question, Mr. Guest means photographs that somebody of us made of C/2001 Q4.
Did somebody?


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