----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
DRAG 0 7654321 2.3
----+----0----+----0----+----0----+----0----+----0----+----0----+----0----+----0
COLUMNS FORMAT DESCRIPTION DEFAULT VALUE & UNITS
1-6 A6 DRAG - Modifies drag application and/or
requests estimation of drag coefficients.
8 I1 Indicates order of drag coefficients: 0
0 - Cd
.
1 - Cd
..
2 - Cd
18-24 I7 Satellite ID (required). 0
. ..
25-44 D20.8 Drag coefficient.(For Cd and Cd the 0. none or
units are per second and per second 1/S or
squared) 1/S**2
45-59 D15.3 This field must be left blank unless 0.
the time dependent drag option is wanted.
To select time dependent drag specify the
end time of the period for which this
acceleration coefficient applies in the
form YYMMDDHHMMSS.SS in this field.
See NOTE[1] for more details.
60-72 D13.1 Standard deviation of drag coefficient. none or
1/S or
1/S**2
AUG 1988
8805.0
ARC SET - Option Cards
DRAG (cont)
NOTE[1]:
Time periods may be specified only for the highest order coefficients
used (i.e. if Cd and Cd dot are used, only Cd dot can have time
intervals).
When using time periods the number of drag cards required is equal
to the number of time periods plus the order (order = the number
in column 8 +1).
The first DRAG card with an end time covers the time period from epoch
to the specified end time. Subsequent drag cards with end times cover
the time interval from the preceeding end time to the current end
time. In this manner continuous time intervals are guaranteed from
epoch to the last specified end time. If orbit integration continues
beyond the end of the last specified drag time interval, the Cd ( or
Cd dot, or Cd double dot) without a time interval is used. A Cd
(or Cd dot or Cd double dot) without a time interval is MANDATORY when
using this time dependent option. See example below.
EXAMPLE: Drag cards for using time dependent drag coefficients.
(highest order - Cd dot;two time intervals; 4 cards required)
----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
DRAG 0 7654321 2.3
DRAG 1 7654321 .00002
DRAG 1 7654321 .000021 840902000000.
DRAG 1 7654321 .000022 840903000000.
----+----0----+----0----+----0----+----0----+----0----+----0----+----0----+----0
WARNINGS: If duplicate time periods are specified the run will terminate
in IIS with a warning message.
The first time period that exceeds the end time of the run
(see EPOCH card) will be accepted. All other end times exceeding
the end time of the run will be ignored.
UNITS: KM =Kilometers; M =Meters ; S =Seconds ; Kg =Kilograms
DEG=Degrees ; RAD=Radians ; AS =Arc seconds; MAS=Milli-arc seconds
IF CARD OMITTED: Drag is applied with a default Cd of 2.3
DEC 1992
9212.0
ARC SET - Option Cards