ACA Acquisition Anomaly

Summary

In early 2004, obsid 4977 was identified as containing an apparent anomaly in the star acquisition sequence. This anomaly manifests itself by acquiring and tracking a star well outside of the commanded searchbox. Post facto processing discovered that the ACA tracked the wrong star for 8 seconds into KALMAN. This was followed by an intervention by the OBC that lead to the acquisition of the correct guide star. It is now clear that this incident is unique only in it's effect on processing.

Details

Below are the detailed acquisition histories for 9 observations where the ACA tracked a star outside it's supposedly assigned search box. The star that is mistakenly tracked is always within another slots search area. This feature would appear to be the key to understanding this anomaly. In many cases the errant slot is recommanded to a fid or a different guide star. However, in several perigee observations, the star holds over into Kalman until the OBC recommands the search sequence. These cases are exact analogs to what we see in 4977, but were not recognized due to a lack of post facto processing.
Obsid 2565
Expected (YANG,ZANG) for slot #2 is (-784, 1870)
Observed (YANG,ZANG) is (-882, 15)

Observed slot #2 is within search box for slot #0

Slot #2 goes to normal position at fid commanding

                                         Slot 2 ( Commanded -784, 1870)                        Slot 0 ( Commanded -989, -84)                         Slot 1 ( Commanded 421, -1000)      
       Time      SEQ     FCT         Yang           Zang            Mag   OBC     FCT         Yang           Zang            Mag   OBC     FCT         Yang           Zang            Mag   OBC
     ---------  ---- | -------    --------       -------         ------- ----  | -------    --------       --------        ------- ----  | -------    --------       --------        ------- ----
     151646446  AQXN | SRCH       -3276.80       -3276.80          13.94  ID   | SRCH       -3276.80       -3276.80          13.94  NOID | TRAK         504.73        -995.15          11.50  ID
     151646447  AQXN | TRAK        -881.62          15.55          11.38  ID   | SRCH       -3276.80       -3276.80          13.94  NOID | TRAK         508.15        -994.03          11.69  ID
     151646448  AQXN | TRAK        -881.62          15.55          11.38  ID   | SRCH       -3276.80       -3276.80          13.94  NOID | TRAK         508.15        -994.03          11.69  ID
     151646449  AQXN | TRAK        -882.12          15.55          11.31  ID   | SRCH       -3276.80       -3276.80          13.94  NOID | TRAK         506.78        -994.95          11.81  ID
     151646450  AQXN | TRAK        -882.12          15.55          11.31  ID   | SRCH       -3276.80       -3276.80          13.94  NOID | TRAK         506.78        -994.95          11.81  ID
     151646451  AQXN | TRAK        -882.05          15.43          11.31  ID   | TRAK        -991.83         -88.80          10.62  NOID | TRAK         506.12       -1001.05          12.00  ID
     151646452  AQXN | TRAK        -882.05          15.43          11.31  ID   | TRAK        -991.83         -88.80          10.62  NOID | TRAK         506.12       -1001.05          12.00  ID
     151646453  AQXN | TRAK        -882.05          15.50          11.38  ID   | TRAK        -991.90         -88.73          10.62  NOID | TRAK         504.93       -1004.50          11.75  ID
     151646454  AQXN | TRAK        -882.05          15.50          11.38  ID   | TRAK        -991.90         -88.73          10.62  NOID | TRAK         504.93       -1004.50          11.75  ID
     151646455  AQXN | TRAK        -882.00          15.23          11.38  ID   | TRAK        -992.05         -88.53          10.62  NOID | TRAK         504.38       -1003.80          11.81  ID
     151646456  AQXN | TRAK        -882.00          15.23          11.38  ID   | TRAK        -992.05         -88.53          10.62  NOID | TRAK         504.38       -1003.80          11.81  ID
     151646458  AQXN | TRAK        -882.12          15.48          11.31  ID   | TRAK        -992.15         -88.48          10.62  NOID | TRAK         504.25       -1003.98          11.88  ID
     151646459  AQXN | TRAK        -882.12          15.48          11.31  ID   | TRAK        -992.15         -88.48          10.62  NOID | TRAK         504.25       -1003.98          11.88  ID
     151646460  GUID | TRAK        -882.23          15.25          11.38  NOID | TRAK        -992.25         -88.33          10.62  NOID | TRAK         503.78       -1004.33          11.88  NOID
     151646461  GUID | TRAK        -882.23          15.25          11.38  NOID | TRAK        -992.25         -88.33          10.62  NOID | TRAK         503.78       -1004.33          11.88  NOID
     151646462  GUID | TRAK        -882.05          15.40          11.31  NOID | TRAK        -992.35         -88.18          10.62  NOID | TRAK         504.12       -1003.73          11.81  NOID
     151646463  GUID | TRAK        -882.05          15.40          11.31  NOID | TRAK        -992.35         -88.18          10.62  NOID | TRAK         504.12       -1003.73          11.81  NOID
     151646464  GUID | TRAK        -882.03          15.48          11.38  NOID | TRAK        -992.35         -88.18          10.62  NOID | TRAK         504.43       -1003.95          11.81  NOID
     151646465  GUID | TRAK        -882.03          15.48          11.38  NOID | TRAK        -992.35         -88.18          10.62  NOID | TRAK         504.43       -1003.95          11.81  NOID
     151646466  GUID | TRAK        -882.15          15.62          11.31  NOID | TRAK        -992.40         -88.12          10.62  NOID | TRAK         503.75       -1003.80          11.69  NOID
     151646467  GUID | TRAK        -882.15          15.62          11.31  NOID | TRAK        -992.40         -88.12          10.62  NOID | TRAK         503.75       -1003.80          11.69  NOID
     151646468  GUID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID
     151646469  GUID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID
     151646470  GUID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID
     151646471  GUID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID
     151646472  GUID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID
     151646473  GUID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID
     151646474  GUID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID
     151646475  GUID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID | SRCH       -3276.80       -3276.80          13.94  NOID
     151646476  GUID | TRAK       -1812.15         166.68           7.19  NOID | TRAK        -759.10       -1736.35           7.06  NOID | TRAK        2153.22         172.85           7.12  NOID
     151646477  GUID | TRAK       -1812.15         166.68           7.19  NOID | TRAK        -759.10       -1736.35           7.06  NOID | TRAK        2153.22         172.85           7.12  NOID
     151646478  GUID | TRAK       -1812.15         166.68           7.19  NOID | TRAK        -759.10       -1736.35           7.06  NOID | TRAK        2153.22         172.85           7.12  NOID
     151646479  GUID | TRAK       -1812.15         166.68           7.19  NOID | TRAK        -759.10       -1736.35           7.06  NOID | TRAK        2153.22         172.85           7.12  NOID
     151646480  KALM | TRAK       -1812.15         166.65           7.19  NOID | TRAK        -759.10       -1736.35           7.06  NOID | TRAK        2153.22         172.85           7.12  NOID
        
Obsid 2968
Expected (YANG,ZANG) for slot #0 is (1146, -1126)
Observed (YANG,ZANG) is (313, 480)

Observed slot #0 is within the search box for slot #2

Slot #0 goes to normal position at fid commanding

              Slot 0 (Commanded 1146, -1126)       
         Time      FCT       Yag       Zag    SEQ 
       ---------  ----  --------  --------  -----   
       155669997  SRCH  -3276.80  -3276.80  AQXN
       155669998  SRCH  -3276.80  -3276.80  AQXN
       155669999  TRAK    313.03    480.10  AQXN
       155670000  TRAK    313.03    480.10  AQXN
       155670001  TRAK    313.08    479.80  AQXN
       155670002  TRAK    313.08    479.80  AQXN
       155670003  TRAK    313.75    479.85  AQXN
       155670004  TRAK    313.75    479.85  AQXN
       155670005  TRAK    313.78    479.88  AQXN
       155670006  TRAK    313.78    479.88  AQXN
       155670007  TRAK    313.62    479.90  AQXN
       155670008  TRAK    313.62    479.90  AQXN
       155670009  TRAK    313.38    480.05  AQXN
       155670010  TRAK    313.38    480.05  AQXN
       155670011  TRAK    313.43    479.68  AQXN
       155670012  TRAK    313.43    479.68  AQXN
       155670013  TRAK    313.50    479.85  AQXN
       155670014  TRAK    313.50    479.85  AQXN
       155670015  TRAK    313.75    479.75  AQXN
       155670016  TRAK    313.75    479.75  AQXN
       155670017  TRAK    313.48    479.62  AQXN
       155670018  TRAK    313.48    479.62  AQXN
       155670019  TRAK    313.30    479.65  GUID
       155670020  TRAK    313.30    479.65  GUID
       ...  
       155670075  TRAK    319.38    484.55  GUID
       155670076  TRAK    319.38    484.55  GUID
       155670077  SRCH  -3276.80  -3276.80  GUID
       155670078  SRCH  -3276.80  -3276.80  GUID
       155670079  SRCH  -3276.80  -3276.80  GUID
       155670080  SRCH  -3276.80  -3276.80  GUID
       155670081  SRCH  -3276.80  -3276.80  GUID
       155670082  SRCH  -3276.80  -3276.80  GUID
       155670083  SRCH  -3276.80  -3276.80  GUID
       155670084  SRCH  -3276.80  -3276.80  GUID
       155670085  TRAK   -760.25  -1736.98  GUID
       155670086  TRAK   -760.25  -1736.98  GUID
       155670087  TRAK   -760.28  -1736.95  GUID
       155670088  TRAK   -760.28  -1736.95  GUID
       155670089  TRAK   -760.28  -1736.98  KALM
       155670090  TRAK   -760.28  -1736.98  KALM      
       
Obsid 2784
Expected (YANG,ZANG) for slot #2 is (-156, -223)
Observed (YANG,ZANG) is (-1326, 748)

Observed slot #2 is within the search box for slot #7

Slot #2 goes to normal position at fid commanding

              Slot 2 (Commanded -156, -223)       
         Time      FCT       Yag       Zag    SEQ 
       ---------  ----  --------  --------  -----   
       143208621  SRCH  -3276.80  -3276.80  AQXN
       143208622  SRCH  -3276.80  -3276.80  AQXN
       143208623  TRAK  -1326.83    748.83  AQXN
       143208624  TRAK  -1326.83    748.83  AQXN
       143208625  TRAK  -1326.68    748.93  AQXN
       143208626  TRAK  -1326.68    748.93  GUID
       143208627  TRAK  -1326.62    749.12  GUID
       143208628  TRAK  -1326.62    749.12  GUID
       143208629  TRAK  -1326.53    749.20  GUID
       143208631  TRAK  -1326.53    749.20  GUID
       143208632  TRAK  -1326.38    749.35  GUID
       143208633  TRAK  -1326.38    749.35  GUID
       143208634  SRCH  -3276.80  -3276.80  GUID
       143208635  SRCH  -3276.80  -3276.80  GUID
       143208636  SRCH  -3276.80  -3276.80  GUID
       143208637  SRCH  -3276.80  -3276.80  GUID
       143208638  SRCH  -3276.80  -3276.80  GUID
       143208639  SRCH  -3276.80  -3276.80  GUID
       143208640  SRCH  -3276.80  -3276.80  GUID
       143208641  SRCH  -3276.80  -3276.80  GUID
       143208642  TRAK    399.18   1825.73  GUID
       143208643  TRAK    399.18   1825.73  KALM
       143208644  TRAK    399.23   1825.73  KALM
       
Obsid 3605
Expected (YANG,ZANG) for slot #1 is (-1733, -2258)
Observed (YANG,ZANG) is (-1925, -1587)

Observed slot #1 is within the search box for slot #4

Slot #1 goes to normal position at fid commanding

              Slot 1 (Commanded -1733, -2258)       
         Time      FCT       Yag       Zag    SEQ 
       ---------  ----  --------  --------  -----   
       165136304  SRCH  -3276.80  -3276.80  AQXN
       165136305  TRAK  -1925.68  -1588.03  AQXN
       165136306  TRAK  -1925.68  -1588.03  AQXN
       165136307  TRAK  -1925.55  -1587.83  AQXN
       165136308  TRAK  -1925.55  -1587.83  AQXN
       165136309  TRAK  -1925.75  -1587.90  AQXN
       165136310  TRAK  -1925.75  -1587.90  AQXN
       165136311  TRAK  -1925.58  -1588.30  AQXN
       165136312  TRAK  -1925.58  -1588.30  AQXN
       165136313  TRAK  -1925.73  -1588.18  GUID
       165136314  TRAK  -1925.73  -1588.18  GUID
       165136315  TRAK  -1925.90  -1588.03  GUID
       165136316  TRAK  -1925.90  -1588.03  GUID
       165136317  TRAK  -1925.85  -1587.95  GUID
       165136318  TRAK  -1925.85  -1587.95  GUID
       165136319  TRAK  -1925.68  -1588.30  GUID
       165136320  TRAK  -1925.68  -1588.30  GUID
       165136321  SRCH  -3276.80  -3276.80  GUID
       165136322  SRCH  -3276.80  -3276.80  GUID
       165136323  SRCH  -3276.80  -3276.80  GUID
       165136324  SRCH  -3276.80  -3276.80  GUID
       165136325  SRCH  -3276.80  -3276.80  GUID
       165136326  SRCH  -3276.80  -3276.80  GUID
       165136327  SRCH  -3276.80  -3276.80  GUID
       165136328  SRCH  -3276.80  -3276.80  GUID
       165136329  TRAK  -1816.23   1061.15  GUID
       165136330  TRAK  -1816.23   1061.15  GUID
       165136331  TRAK  -1816.23   1061.15  GUID
       165136332  TRAK  -1816.23   1061.15  GUID
       165136333  TRAK  -1816.23   1061.15  KALM
       165136334  TRAK  -1816.23   1061.15  KALM
       
Obsid 60960
Expected (YANG,ZANG) for slot #7 is (-1844, -1364)
Observed (YANG,ZANG) is (-1788, -1733)

Observed slot #7 is within the search box for slot #1

Slot #7 is unused after acquisition, and continues to track the bad star

              Slot 7 (Commanded -1844, -1364)       
         Time      FCT       Yag       Zag    SEQ 
       ---------  ----  --------  --------  -----   
       153751381  SRCH  -3276.80  -3276.80  AQXN
       153751382  SRCH  -3276.80  -3276.80  AQXN
       153751383  TRAK  -1785.23  -1733.05  AQXN
       153751384  TRAK  -1785.23  -1733.05  AQXN
       153751385  TRAK  -1785.10  -1733.10  AQXN
       153751386  TRAK  -1785.10  -1733.10  AQXN
       153751387  TRAK  -1785.58  -1732.85  AQXN
       153751388  TRAK  -1785.58  -1732.85  AQXN
       153751389  TRAK  -1785.20  -1733.03  AQXN
       153751390  TRAK  -1785.20  -1733.03  AQXN
       153751391  TRAK  -1785.28  -1733.12  GUID
       153751392  TRAK  -1785.28  -1733.12  GUID
       153751393  TRAK  -1785.18  -1732.93  GUID
       153751395  TRAK  -1785.18  -1732.93  GUID
       153751396  TRAK  -1785.10  -1732.90  GUID
       153751397  TRAK  -1785.10  -1732.90  GUID
       153751398  TRAK  -1785.10  -1732.95  GUID
       153751399  TRAK  -1785.10  -1732.95  GUID
       153751400  TRAK  -1785.25  -1732.90  GUID
       153751401  TRAK  -1785.25  -1732.90  GUID
       153751402  TRAK  -1784.90  -1732.98  GUID
       153751403  TRAK  -1784.90  -1732.98  GUID
       153751404  TRAK  -1785.12  -1732.95  GUID
       153751405  TRAK  -1785.12  -1732.95  GUID
       153751406  TRAK  -1785.43  -1732.95  GUID
       153751407  TRAK  -1785.43  -1732.95  GUID
       153751408  TRAK  -1785.10  -1732.88  GUID
       153751409  TRAK  -1785.10  -1732.88  GUID
       153751410  TRAK  -1785.28  -1733.03  GUID
       153751411  TRAK  -1785.28  -1733.03  GUID
       153751412  TRAK  -1785.12  -1733.12  KALM
       153751413  TRAK  -1785.12  -1733.12  KALM
       
Obsid 61232
Expected (YANG,ZANG) for slot #7 is (-1456, 1060)
Observed (YANG,ZANG) is (-1907, -1317)

Observed slot #7 is within the search box for slot #5

Slot #7 recommands search sequence for guide star after beginning of Kalman.

              Slot 7 (Commanded -1456, 1060)       
         Time      FCT       Yag       Zag    SEQ 
       ---------  ----  --------  --------  -----   
       135239979  SRCH  -3276.80  -3276.80  AQXN
       135239980  SRCH  -3276.80  -3276.80  AQXN
       135239981  TRAK  -1907.38  -1317.73  AQXN
       135239982  TRAK  -1907.38  -1317.73  AQXN
       135239983  TRAK  -1907.35  -1317.70  AQXN
       135239984  TRAK  -1907.35  -1317.70  AQXN
       135239985  TRAK  -1907.30  -1317.78  GUID
       ...
       135240053  TRAK  -1874.98  -1340.18  GUID
       135240054  TRAK  -1874.98  -1340.18  GUID
       135240055  TRAK  -1874.38  -1340.58  KALM
       135240056  TRAK  -1874.38  -1340.58  KALM
       135240057  TRAK  -1873.70  -1341.33  KALM
       135240058  TRAK  -1873.70  -1341.33  KALM
       135240059  TRAK  -1873.15  -1341.78  KALM
       135240060  TRAK  -1873.15  -1341.78  KALM
       135240061  TRAK  -1872.33  -1342.12  KALM
       135240062  TRAK  -1872.33  -1342.12  KALM
       135240063  SRCH  -3276.80  -3276.80  KALM
       135240064  SRCH  -3276.80  -3276.80  KALM
       135240065  SRCH  -3276.80  -3276.80  KALM
       135240066  SRCH  -3276.80  -3276.80  KALM
       135240067  SRCH  -3276.80  -3276.80  KALM
       135240068  SRCH  -3276.80  -3276.80  KALM
       135240069  SRCH  -3276.80  -3276.80  KALM
       135240070  SRCH  -3276.80  -3276.80  KALM
       135240071  TRAK  -1457.30  -1050.45  KALM
       135240072  TRAK  -1457.30  -1050.45  KALM
       
Obsid 61243
Expected (YANG,ZANG) for slot #4 is (-1248, -1092)
Observed (YANG,ZANG) is (-1657, 1241)

Observed slot #4 is within the search box for slot #3

Slot #4 recommands search sequence for guide star after beginning of Kalman.

              Slot 4 (Commanded -1248, -1092)       
         Time      FCT       Yag       Zag    SEQ 
       ---------  ----  --------  --------  -----   
       134339612  SRCH  -3276.80  -3276.80  AQXN
       134339613  SRCH  -3276.80  -3276.80  AQXN
       134339614  SRCH  -3276.80  -3276.80  AQXN
       134339615  TRAK  -1657.33   1241.03  AQXN
       134339616  TRAK  -1657.33   1241.03  AQXN
       134339617  TRAK  -1657.25   1240.90  AQXN
       134339618  TRAK  -1657.25   1240.90  AQXN
       134339619  TRAK  -1657.25   1240.73  AQXN
       134339620  TRAK  -1657.25   1240.73  AQXN
       134339621  TRAK  -1657.12   1240.65  GUID
       134339622  TRAK  -1657.12   1240.65  GUID
       134339623  TRAK  -1657.00   1240.53  GUID
       134339624  TRAK  -1657.00   1240.53  GUID
       134339625  TRAK  -1656.93   1240.40  GUID
       134339626  TRAK  -1656.93   1240.40  GUID
       134339627  TRAK  -1656.95   1240.28  GUID
       134339628  TRAK  -1656.95   1240.28  GUID
       134339629  TRAK  -1656.93   1240.30  GUID
       134339630  TRAK  -1656.93   1240.30  GUID
       134339631  TRAK  -1657.00   1240.35  GUID
       134339632  TRAK  -1657.00   1240.35  GUID
       134339633  TRAK  -1657.10   1240.62  GUID
       134339634  TRAK  -1657.10   1240.62  GUID
       134339635  TRAK  -1657.20   1240.88  GUID
       134339636  TRAK  -1657.20   1240.88  GUID
       134339637  TRAK  -1657.38   1241.18  KALM
       134339638  TRAK  -1657.38   1241.18  KALM
       134339639  TRAK  -1657.53   1241.50  KALM
       134339640  TRAK  -1657.53   1241.50  KALM
       134339641  TRAK  -1657.65   1241.78  KALM
       134339642  TRAK  -1657.65   1241.78  KALM
       134339643  TRAK  -1657.80   1242.15  KALM
       134339644  TRAK  -1657.80   1242.15  KALM
       134339645  SRCH  -3276.80  -3276.80  KALM
       134339646  SRCH  -3276.80  -3276.80  KALM
       134339648  SRCH  -3276.80  -3276.80  KALM
       134339649  SRCH  -3276.80  -3276.80  KALM
       134339650  SRCH  -3276.80  -3276.80  KALM
       134339651  SRCH  -3276.80  -3276.80  KALM
       134339652  SRCH  -3276.80  -3276.80  KALM
       134339653  SRCH  -3276.80  -3276.80  KALM
       134339654  TRAK  -1237.60  -1098.80  KALM
       134339655  TRAK  -1237.60  -1098.80  KALM
       
Obsid 61695
Expected (YANG,ZANG) for slot #5 is (-583,-2150)
Observed (YANG,ZANG) is (-661,-1350)

Observed slot #5 is within the search box for slot #1

Slot #5 recommands search sequence for guide star after beginning of Kalman.

              Slot 5 (Commanded -583, -2150)       
         Time      FCT       Yag       Zag    SEQ 
       ---------  ----  --------  --------  -----   
       101427055  SRCH  -3276.80  -3276.80  AQXN
       101427056  TRAK   -662.62  -1350.23  AQXN
       101427057  TRAK   -662.62  -1350.23  AQXN
       101427058  TRAK   -662.50  -1350.03  AQXN
       101427059  TRAK   -662.50  -1350.03  AQXN
       101427060  TRAK   -662.18  -1349.88  AQXN
       101427061  TRAK   -662.18  -1349.88  AQXN
       101427062  TRAK   -662.08  -1349.62  AQXN
       101427063  TRAK   -662.08  -1349.62  AQXN
       101427064  TRAK   -661.93  -1349.45  AQXN
       101427065  TRAK   -661.93  -1349.45  AQXN
       101427066  TRAK   -661.83  -1349.23  GUID
       ... 
       101427085  TRAK   -660.08  -1347.05  GUID
       101427086  TRAK   -660.08  -1347.05  GUID
       101427087  TRAK   -659.85  -1346.78  KALM
       101427088  TRAK   -659.85  -1346.78  KALM
       101427089  TRAK   -659.62  -1346.38  KALM
       101427090  TRAK   -659.62  -1346.38  KALM
       101427091  TRAK   -659.38  -1346.10  KALM
       101427092  TRAK   -659.38  -1346.10  KALM
       101427093  TRAK   -659.12  -1345.85  KALM
       101427094  TRAK   -659.12  -1345.85  KALM
       101427095  SRCH  -3276.80  -3276.80  KALM
       101427096  SRCH  -3276.80  -3276.80  KALM
       101427097  SRCH  -3276.80  -3276.80  KALM
       101427098  SRCH  -3276.80  -3276.80  KALM
       101427099  SRCH  -3276.80  -3276.80  KALM
       101427100  SRCH  -3276.80  -3276.80  KALM
       101427101  SRCH  -3276.80  -3276.80  KALM
       101427102  SRCH  -3276.80  -3276.80  KALM
       101427103  TRAK   -568.50  -2161.30  KALM
       101427104  TRAK   -568.50  -2161.30  KALM
       
Obsid 61980
Expected (YANG,ZANG) for slot #3 is (-804,-1129)
Observed (YANG,ZANG) is (-1370,-687)

Observed slot #3 is within the search box for slot #0

Slot #3 recommands search sequence for guide star after beginning of Kalman.

              Slot 3 (Commanded -804, -1129)       
         Time      FCT       Yag       Zag    SEQ 
       ---------  ----  --------  --------  -----   
        81365900  SRCH  -3276.80  -3276.80  AQXN
        81365901  SRCH  -3276.80  -3276.80  AQXN
        81365902  TRAK  -1369.80   -687.00  AQXN
        81365903  TRAK  -1369.80   -687.00  AQXN
        81365904  TRAK  -1369.95   -687.08  AQXN
        81365905  TRAK  -1369.95   -687.08  AQXN
        81365906  TRAK  -1369.98   -687.10  AQXN
        81365907  TRAK  -1369.98   -687.10  AQXN
        81365908  TRAK  -1370.08   -687.12  AQXN
        81365909  TRAK  -1370.08   -687.12  GUID
        81365910  TRAK  -1370.12   -687.10  GUID
        81365911  TRAK  -1370.12   -687.10  GUID
        81365912  TRAK  -1370.25   -687.12  GUID
        81365913  TRAK  -1370.25   -687.12  GUID
        81365914  TRAK  -1370.30   -687.15  GUID
        81365915  TRAK  -1370.30   -687.15  GUID
        81365916  TRAK  -1370.40   -687.15  GUID
        81365917  TRAK  -1370.40   -687.15  KALM
        81365918  TRAK  -1370.43   -687.15  KALM
        81365919  TRAK  -1370.43   -687.15  KALM
        81365920  TRAK  -1370.48   -687.30  KALM
        81365921  TRAK  -1370.48   -687.30  KALM
        81365922  TRAK  -1370.45   -687.25  KALM
        81365923  TRAK  -1370.45   -687.25  KALM
        81365924  SRCH  -3276.80  -3276.80  KALM
        81365925  SRCH  -3276.80  -3276.80  KALM
        81365927  SRCH  -3276.80  -3276.80  KALM
        81365928  SRCH  -3276.80  -3276.80  KALM
        81365929  SRCH  -3276.80  -3276.80  KALM
        81365930  SRCH  -3276.80  -3276.80  KALM
        81365931  SRCH  -3276.80  -3276.80  KALM
        81365932  SRCH  -3276.80  -3276.80  KALM
        81365933  TRAK   -812.75  -1122.33  KALM
        81365934  TRAK   -812.75  -1122.33  KALM
        

Conclusion

The root cause of this anomaly is still unknown. Analysis of these data are continuing here at SAO as well as at Ball to understand this problem. We have studied this anomaly thoroughly and conclude, even though it is a recurring phenomena, that it poses minimal threat to continued normal spacecraft operation.



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Last modified:12/27/13