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Operations CXO Status Report

Monday 29 May 2000 10.00am EDT

During the last week, Chandra completed the observing schedule as planned with the exception of a 2 Ks HETG observation of the TOO XTE J1550-564 on 5/22 which was was made without the HETG inserted. The reason was traced to a ground system file update process which has been addressed.

The fourth ACIS squeegee mode test was conducted as planned at 5.30pm EDT on 5/22. The test was aimed at removal of a bias instability seen in the previous squeegee mode tests, and initial assessment of the results indicate that the on-orbit data are consistent with laboratory results in removing the instability - i.e., a successful test. Planning is underway for the next series of tests aimed at optimizing the squeegee mode parameters, with certain tests being performed from the daily load.

The planned observations for the coming week are as follows.

------------------------------------------
PG 1254+047            ACIS-S          May 28
MRK 421                ACIS-S/HETG     May 29
MRK 421                ACIS-S/LETG
PSR J0437-4715         ACIS-S
TOO J1550-564 (decay)  ACIS-S/HETG     May 30
Radiation Belts
1736-297               ACIS-S
PKS 2155-304           ACIS-S/LETG
PKS 2155-304           HRC-S/LETG      May 31
PKS 2155-304           ACIS-S/HETG
M31 Transient          ACIS-S
NGC 7027               ACIS-S
3C 351                 ACIS-S          Jun  1
AX J1510+0742          ACIS-I
Q1422+231              ACIS-S
TOO J1550-564 (decay)  ACIS-S/HETG
Radiation Belts
NGC 5506               ACIS-S          Jun  2
PG 1115+080            ACIS-S
AXAF Southern Deep Fld ACIS-I          Jun  2/3
Radiation Belts                        Jun  4

------------------------------------------

All spacecraft subsystems continued to operate nominally.

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