Zon Mosaic Pro5 Guide de l'utilisateur Page 163

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Adding Your Own Data 163
Tip: Not every option for adding new
objects appears in an object’s contextual
menu. For example, the Sun’s contextual
menu has no option to add a new planet.
However, the Orbit Editor lets you change
the type of object being added, so just
choose New Asteroid from the contextual
menu, and then change the type of object
being added by using the Orbit Editor.
Orbit Editor: The Orbit Editor dialog box
opens with a default view of your new
object’s orbit. Along the top of the dialog
box is a dropbox that allows you to choose
the type of object (planet, comet, moon,
artificial satellite, asteroid or planetoid)
and a box where you can type in the new
object’s name.
Beneath these boxes is an image of your
new object’s orbit. This is actually not a
static image, but a functional and
resizeable Starry Night window. By
clicking and dragging the bottom right
corner of this dialog box, you can enlarge
the Orbit Editor dialog box, making your
object’s orbit easier to see. You can use the
elevation buttons in this dialog box to
move closer or farther from your object,
and use the Location Scroller to rotate
your view of the object’s orbit. As you
change your object’s orbit by adjusting its
orbital elements (described in the
following section), these changes will be
reflected in the image.
Orbital Elements: The Orbital Elements
tab controls the attributes of your new
object’s orbit.
A set of orbital elements provides enough
information to specify an object’s exact
orbit about its parent body, and places the
object at a specific point on this orbit at
one moment in time. Kepler’s laws of
motion allow Starry Night to calculate the
new object’s position in its orbit at any
other time. There are several different
ways to specify a complete set of orbital
elements. You can select one of these
using the “Style” dropbox in the Orbit
Editor dialog box.
Tip: The next few sections explain the
meaning of each orbital element. However,
another way to learn what each element
means is to play around with the orbital
element sliders. You’ll quickly see how
these changes affect the orbit of your new
object.
Element Style (Pericentric): The
pericentric style is usually used to specify
the orbital elements of comets.
Eccentricity (e): Eccentricity describes
the shape of an object’s orbit. The
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