Stopping Conditions

Stopping conditions are Astrogator components that are used by Propagate, Follow, and Finite Maneuver segments to define the point at which propagation should stop. The stopping conditions that are available in Astrogator are described in the following table.

Astrogator Stopping Conditions

Condition	Description
Access	Stop upon achieving access between two objects in the scenario. You can only use one star or planet to define an access condition.
Altitude	Stop at a specified altitude above the central body.
Always Tripped	Stop at each integration step and evaluate the constraints. If the constraints are met or if there are no constraints, propagation stops. Otherwise, propagation advances to the next step and the constraints are evaluated again.
Apoapsis	Stop at the farthest point from the origin.
Argument of Latitude	Stop on a specified argument of latitude.
Ascending Node	Stop when crossing the X-Y plane of the coordinate system in the +Z direction.
Delta-V	Stop at a specified Delta-V. This is for finite maneuvers only.
Descending Node	Stop when crossing the X-Y plane of the coordinate system in the -Z direction.
Duration	Stop after a specified duration.
Epoch	Stop on a specified date and time.
Lighting	Stop at a lighting condition (e.g., entering or exiting Direct Sun or Umbra).
Longitude	Stop at a specified longitude.
MeanNumRevs	Stop on a fractional number of revolutions, defined as (Duration / Kozai-Izsak Mean Orbit Period).
Mean Anomaly	Stop at a specified mean anomaly.
Periapsis	Stop at the closest point to the origin.
R Magnitude	Stop at a specified distance from the origin.
True Anomaly	Stop at a specified true anomaly.
User Select	Stop at a value defined by a calculation object.
X-Y Plane Cross	Stop when crossing the X-Y plane.
Y-Z Plane Cross	Stop when crossing the Y-Z plane.
Z-X Plane Cross	Stop when crossing the Z-X plane.

Custom stopping conditions

You can duplicate the User Select stopping condition to create a new stopping condition. You can also use a duplicate to define a special variant of an existing stopping condition. For example, you can define a Duration stopping condition that includes constraints. Double-click the User Select stopping condition to open its properties dialog box. The stopping conditions properties of a User Select component are the same as the properties of a Propagate segment.