Data Providers: Satellite: Astrogator Pass Data: Keplerian Elems

Calc Objects for the ephemeris of the object, expressed in keplerian (i.e., instantaneous two-body) elements. Each Calc Object allows a choice of element type (Osculating elements, Kozai-Izsak Mean elements, Brouwer-Lyddane Mean elements using only short period terms, and Brouwer-Lyddane Mean elements using both short and long period terms). The default is osculating.

Name	Dimension	Type	Description
Time	DateFormat	Real Number	Time.
Altitude_Of_Apoapsis	DistanceUnit	Real Number	The difference between the radius of apoapsis and the central body's equatorial radius. The Calc Object allows a choice of a central body. The default is Earth.
Altitude_Of_Periapsis	DistanceUnit	Real Number	The difference between the radius of apoapsis and the central body's equatorial radius. The Calc Object allows a choice of a central body. The default is Earth.
Argument_of_Latitude	AngleUnit	Real Number	The sum of the argument of periapsis and true anomaly. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Argument_of_Periapsis	AngleUnit	Real Number	The angle from the ascending node to the periapsis vector measured in the orbit plane in the direction of the object's motion. The periapsis vector locates the closest point of the orbit. For a circular orbit, the value is defined to be zero (i.e., periapsis at the ascending node). The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Eccentric_Anomaly	AngleUnit	Real Number	Not defined for this class of object.
Eccentricity	Unitless	Real Number	A measure of the shape of the orbit. Values <1 indicate an ellipse (where zero is a circular orbit) and values >1 indicate a hyperbola.
Inclination	AngleUnit	Real Number	The angle between the orbit plane and the XY plane of the coordinate system.
Longitude_Of_Ascending_Node	AngleUnit	Real Number	A measure of the right ascension of the ascending node, made in the Fixed frame. The value is the detic longitude of the orbit's ascending node. The ascending node crossing is assumed to be at, or prior to, the current position in the orbit in the same nodal revolution. The Calc Object allows a choice of a central body. The default is Earth.
MeanAnomaly	AngleUnit	Real Number	A measure of the time past periapsis passing, expressed as an angle. The Calc Object allows a choice of a central body. The default is Earth.
Mean_Motion	AngleRateUnit	Real Number	Not defined for this class of object.
Orbit_Period	TimeUnit	Real Number	Time required for a complete revolution as computed from osculating semi-major axis length. The Calc Object allows a choice of a central body. The default is Earth.
RAAN	AngleUnit	Real Number	Not defined for this class of object.
Radius_Of_Apoapsis	DistanceUnit	Real Number	The magnitude of the apoapsis vector. The apoapsis vector (defined only when the eccentricity is <1) locates the position in the orbit furthest from the central body. The Calc Object allows a choice of a central body. The default is Earth.
Radius_Of_Periapsis	DistanceUnit	Real Number	The magnitude of the periapsis vector. The periapsis vector locates the position in the orbit closest to the central body. The Calc Object allows a choice of a central body. The default is Earth.
Semimajor_Axis	DistanceUnit	Real Number	Not defined for this class of object.
Time_Past_Asc_Node	TimeUnit	Real Number	The elapsed time since passing the last ascending node crossing based on assumed two-body motion.. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Time_Past_Periapsis	TimeUnit	Real Number	The elapsed time since passing the last periapsis crossing based on assumed two-body motion.. The Calc Object allows a choice of a central body. The default is Earth.
True_Anomaly	AngleUnit	Real Number	Not defined for this class of object.

Name

Dimension

Type

Description

Time

DateFormat

Real Number

Time.

Altitude_Of_Apoapsis

DistanceUnit

Real Number

The difference between the radius of apoapsis and the central body's equatorial radius. The Calc Object allows a choice of a central body. The default is Earth.

Altitude_Of_Periapsis

DistanceUnit

Real Number

The difference between the radius of apoapsis and the central body's equatorial radius. The Calc Object allows a choice of a central body. The default is Earth.

Argument_of_Latitude

AngleUnit

Real Number

The sum of the argument of periapsis and true anomaly. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.

Argument_of_Periapsis

AngleUnit

Real Number

The angle from the ascending node to the periapsis vector measured in the orbit plane in the direction of the object's motion. The periapsis vector locates the closest point of the orbit. For a circular orbit, the value is defined to be zero (i.e., periapsis at the ascending node). The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.

Eccentric_Anomaly

AngleUnit

Real Number

Not defined for this class of object.

Eccentricity

Unitless

Real Number

A measure of the shape of the orbit. Values <1 indicate an ellipse (where zero is a circular orbit) and values >1 indicate a hyperbola.

Inclination

AngleUnit

Real Number

The angle between the orbit plane and the XY plane of the coordinate system.

Longitude_Of_Ascending_Node

AngleUnit

Real Number

A measure of the right ascension of the ascending node, made in the Fixed frame. The value is the detic longitude of the orbit's ascending node. The ascending node crossing is assumed to be at, or prior to, the current position in the orbit in the same nodal revolution. The Calc Object allows a choice of a central body. The default is Earth.

MeanAnomaly

AngleUnit

Real Number

A measure of the time past periapsis passing, expressed as an angle. The Calc Object allows a choice of a central body. The default is Earth.

Mean_Motion

AngleRateUnit

Real Number

Not defined for this class of object.

Orbit_Period

TimeUnit

Real Number

Time required for a complete revolution as computed from osculating semi-major axis length. The Calc Object allows a choice of a central body. The default is Earth.

RAAN

AngleUnit

Real Number

Not defined for this class of object.

Radius_Of_Apoapsis

DistanceUnit

Real Number

The magnitude of the apoapsis vector. The apoapsis vector (defined only when the eccentricity is <1) locates the position in the orbit furthest from the central body. The Calc Object allows a choice of a central body. The default is Earth.

Radius_Of_Periapsis

DistanceUnit

Real Number

The magnitude of the periapsis vector. The periapsis vector locates the position in the orbit closest to the central body. The Calc Object allows a choice of a central body. The default is Earth.

Semimajor_Axis

DistanceUnit

Real Number

Not defined for this class of object.

Time_Past_Asc_Node

TimeUnit

Real Number

The elapsed time since passing the last ascending node crossing based on assumed two-body motion.. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.

Time_Past_Periapsis

TimeUnit

Real Number

The elapsed time since passing the last periapsis crossing based on assumed two-body motion.. The Calc Object allows a choice of a central body. The default is Earth.

True_Anomaly

AngleUnit

Real Number

Not defined for this class of object.