Status Report #7:

July 17th 1991

Satellite status:

After a long slew on July 5th, ROSAT became lost due to earthblock and lack of guide stars. Consequently the satellite went into safe mode as it had been too long without reference stars. Recovery procedures were carried out over the weekend of July 6-7th. On July 8th, the first portion of the modified attitude control software was uplinked although for safety reasons the PSPC high voltage was left off and the filter wheel was left closed. All systems were up and running again on July 9th and observations have been continuing successfully in the long-pointing mode ever since. The uploading of new software at this point enabled different pointing constraints to come into play, which allow scheduling of some southern hemisphere targets. GSOC is now using +/- 12 degrees for their sun window, still requiring guide stars for contact orbits.

There follows the newest section of timeline:

        16 Jul - 17 Jul  UK   EX HYDRAE         Hellier
        17 Jul - 18 Jul  WG   A3558             Zamorani
        18 Jul - 19 Jul  US   WP23              David
        19 Jul - 20 Jul  US   PG1346+82         Lamb
        20 Jul - 21 Jul  US   Q1413+1143        Turnshek
        21 Jul - 22 Jul  US   3C294             McCarthy
        22 Jul - 23 Jul  WG   LHS2924           Schmitt
        23 Jul - 24 Jul  US   GC1556+335        Meyer
        24 Jul - 25 Jul  WG   M 31              Truemper
        25 Jul - 26 Jul  WG   M 31              Truemper
        26 Jul - 27 Jul  WG   M 31              Truemper
        27 Jul - 28 Jul  WG   M 31              Truemper
        28 Jul - 29 Jul  WG   NGC 383           Boehringer
        29 Jul - 30 Jul  US   M 33              Long
        30 Jul - 31 Jul  UK   MBM 7             Harris
        31 Jul -  1 Aug  WG   MBM 12            Snowden
         1 Aug -  2 Aug  US   TT ARIETIS        Cordova
         2 Aug -  3 Aug  WG   NEP               WG
         3 Aug - 12 Aug  WG   Survey Finish     WG
        13 Aug -  14 Aug  US   NGC1332          Canizares
        14 Aug -  15 Aug  UK   EXO033319-2554.2 King
        15 Aug -  16 Aug  US   N1399            Jones
        16 Aug -  17 Aug  WG   TYCHO            Brinkmann
        17 Aug -  18 Aug  UK   HT CAS           Naylor
        18 Aug -  19 Aug  WG   ALP PER          Schmitt
        19 Aug -  20 Aug  US   NGC891           Bregman
        20 Aug -  21 Aug  US   PERSEUS-NORTH    Kowalski        
        21 Aug -  22 Aug  US   PERSEUS-SOUTH    Kowalski
        22 Aug -  23 Aug  US   V410TAU          Strom 
        23 Aug -  24 Aug  US   PLEIADES-CENTER  Caillault
        24 Aug -  25 Aug  US   PLEIADES-FIELD   Rosner
        25 Aug -  26 Aug  US   V471TAU          Shipman
        26 Aug -  27 Aug  US   H0323+022        Madejski

A SASS data processing report will follow in a few days.

Status Report #8 Previous

Status Report #6

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Curator: Michael Arida (ADNET); arida@milkyway.gsfc.nasa.gov
HEASARC Guest Observer Facility

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This file was last modified on Tuesday, 14-Sep-1999 11:47:03 EDT