QUOTE (volcanopele @ Jul 15 2013, 06:16 PM)
All orbits in the solar system (around the earth, around the Sun, around other planets) use "the First Point of Ares" as the origin for the longitude of ascending node.
When planning orbits for Venus, does Celestial Sphere Equator run through the Venus equator or stay referenced to the earth equator when planning orbits?
Looking at the diagram here:
http://en.wikipedia.org/wiki/File:Earths_o...nd_ecliptic.PNGThey have the celestial (sphere)equator lined up to the earth equator. But Venus doesnt have the same incline as earth so when planing orbital paths at venus what are they using? Are they always using earth stars and celestial sphere as shown in the diagram to plan orbits for Venus?
You follow me?
I would like in my model to create my own celestial sphere around Venus but not sure if I should align it to the Venus equator. This stuff is new to me so trying to get a hold on the concepts. Most info on the web references earth rather than from the perspective of other planets so I have to make the jump to the perspective of other planets.
Part 2 of the question:
So if I look at an image from here:
ftp://psa.esac.esa.int/pub/mirror/VENUS-E...83_0005_VI2.IMGand it shows me this:
/* ORBITAL INFORMATION */
ASCENDING_NODE_LONGITUDE = 106.13
ORBIT_NUMBER = 1083
ORBITAL_ECCENTRICITY = 0.841
ORBITAL_INCLINATION = 89.97
ORBITAL_SEMIMAJOR_AXIS = 39381.3
PERIAPSIS_ALTITUDE = 210.21
PERIAPSIS_ARGUMENT_ANGLE = 91.79
PERIAPSIS_TIME = 2009-04-08T03:33:55.000Z
All this orbital information was used using Earths Equatorial as the "reference plane" when calculating orbits instead of Venus equatorial plane even though they are at Venus.
Is that correct?
thanks