FIND @name DISTANCE
(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:)
The FIND DISTANCE command locates intervals during which the apparent
distance OF a target body as seen FROM an observing body satisfies a
specified constraint.
It may also be used to locate intervals during which the apparent distance BETWEEN two target bodies as seen from an observing body satisfies a specified constraint.
Distances are always between centers of mass.
The FIND command requires you to specify a step size to use when searching for events. See the chapter About Constraints for a discussion of STEP SIZE.
In the following example, the FIND DISTANCE command is used to determine
intervals when asteroid Hektor is within .1 AU of its closest approach to
Jupiter.
SET STEPSIZE .25 YEARS;
FIND schedule CLOSEST
when the DISTANCE BETWEEN HEKTOR JUPITER
FROM EARTH ABSOLUTE MINIMUM PLUS 0.1 AU
STEP SIZE STEPSIZE;
In the second example, the FIND DISTANCE command is used to determine
intervals when asteroid Hungaria passes within 1 AU of Earth.
FIND CLOSE DISTANCE OF HUNGARIA
FROM EARTH LESS THAN 1 AU
STEP SIZE STEPSIZE;