FIND @name RANGE RATE
(2:2){ FROM @body
| @options
| OF @body
| BETWEEN @body @body }
(1:1){ GREATER THAN @number
| LESS THAN @number
| EQUAL TO @number
| BETWEEN @number AND @number
| ABSOLUTE MINIMUM PLUS @number(0:)
| ABSOLUTE MAXIMUM MINUS @number(0:)
| ABSOLUTE MINIMUM
| ABSOLUTE MAXIMUM
| LOCAL MINIMUM
| LOCAL MAXIMUM }
(0:1){ WITHIN @name }
STEP SIZE @number(0:)
This command can be used to find intervals when the apparent range rate OF a
target body as seen FROM an observing body satisfies a specified constraint.
The command can also be used to locate intervals when the apparent range rate BETWEEN two target bodies as seen from an observing body satisfies a specified constraint.
In either case, range rate is the derivative of apparent distance with respect to time.
In the following example, the FIND RANGE RATE command is used to determine
intervals when Mars is approaching Earth.
FIND APPROACHING RANGE RATE OF MARS
FROM EARTH LESS THAN 0
STEP SIZE 4 WEEKS;
In the following example, the FIND RANGE RATE command is used to determine
intervals when the apparent range rate between Phobos and Deimos is within 10
meters/second of its minimum across the default search interval.
FIND MINSPEED RANGE RATE
BETWEEN PHOBOS DEIMOS FROM EARTH
ABSOLUTE MINIMUM PLUS 10 METERS/SEC
STEP SIZE 15 MINUTES;