Define (Star)
Define the basic properties of a star
Syntax
Define <StarObjectPath> {StarOption} <Parameters>
Description
The Define command allows you to define basic properties for a specified star instance.
{StarOption} can be:
| {StarOption} <Parameters> | Description |
|---|---|
| Position <RightAscen> <Declination> | <RightAscen> and <Declination> are entered in degrees |
| Motion <RightAscen> <Declination> | <RightAscen> and <Declination> are entered in arc seconds/year. |
| Magnitude <Magnitude> | <Magnitude> is a real number between -3.0 and 100.0. |
| Parallax <Parallax> | <Parallax> is entered in arc seconds. |
| StarDB {ScenarioCollection | "<CollectionName>"} ID <StarID> | Define a star from an entry in a Star collection. Enter ScenarioCollection to use the current default star collection. <StarID> is the identification number of the star that you wish to select. |
Examples
To set the position of a star with a right ascension of 20.0 degrees and a declination of 48.0 degrees:
Define */Star/Twinkle Position 20.0 48.0
To set the position of a star with a magnitude of 6.0:
Define */Star/Twinkle Magnitude 6.0
To set the position of a star with a parallax of 3.5 arc seconds:
Define */Star/Twinkle Parallax 3.5
To select the star with ID Number 1256 from the current default star collection:
Define */Star/Star1 StarDB ScenarioCollection ID 1256
To create Star2 and define its basic properties based on the entry in the specified collection that matches Id number 32349:
New / */Star Star2
Define */Star/Star2 StarDB "Hipparcos 2 Mag 6" Id 32349
Return message
Group membership
This command belongs to the following group(s):
Version
9.2.1