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4
2
0
-2
-4
t
.
.
.
I "W
Fig. 4.4-1: Schematic block diagrm of on-orbit control loop
: b
:. .:
b
4 . ............................................ . , .................
&'
. . .
60 63 66 69
star identification in scan mode
stars in orr-board catalogue
+ stars not in on-board'catalogue
Fig. 4.62
Star identification pattern in (ROSAT) scan mode
X
I
-
-
23-17
ww w--
Wheel
I \ I
1
+
I
7
z
Fig. 4.2-2:
Y
p
/ I
#'
57- \.; t - - - - -
Momentam- and reaction wheel arrangement