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BOKZ Star Instrument Family
In-orbit processing results
The operating star trackers ­ BOKZ and BOKZ-M ­ can be considered prototypes for the instruments should which provide for controlling s/c angular motion parameters in nominal operation conditions without any support by other systems of the s/c housekeeping system. This operation mode was proved on the Yamal-200, Cosmos-2410, Cosmos-2420 and Resurs-DK spacecraft.

Non-nominal operation conditions are as follows: ­ S/c angular velocity exceeds the value admissible for certain star instrument modification. ­ There are bright natural objects (the Sun, the Earth and the Moon) within the instrument's field of view. ­ There are artificial objects (space debris) within the instrument's field of view.


BOKZ Star Instrument Family
SC trajectory with the attitude control break due to the Sun illumination
35 0 30 0

25 0

20 0 , .

15 0 alfa de lt a 10 0 Az

50

0 1 2 : 5 7: 36 -5 0 13: 12: 00 13: 26 :2 4 1 3: 40 :4 8 1 3:55 :1 2 1 4: 09 :3 6 1 4: 24 :0 0 14: 38 :2 4

-1 0 0


BOKZ Star Instrument Family
Period of Star tracker non-operation due to the Sun illumination

Z -2 14:20:08 =23°26'



Z -2 14:07:06 =24°58'


BOKZ Star Instrument Family
Artificial objects

An image of a particle with a size of 150 µm at a distance of 2.8 m from the BOKZ instrument onboard the Yamal-200 spacecraft