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Дата изменения: Tue Mar 11 23:59:16 1997 Дата индексирования: Thu Feb 27 23:54:28 2014 Кодировка: Поисковые слова: storm |
SMOV STATUS & PLANNING MEETING - 2 MAR. 97 STATUS REPORTS 1. Observatory Status MOSES status reports: -PCS - Fine guiding has resumed although there was one instance of loss of lock since the last meeting. FHST maps have been made and gyro bias updates continue. All else nominal. - Other observatory subsystems all nominal 2. WFPC2 Status - nominal - The UV monitor continues to show a loss rate in UV sensitivity that is roughly consistence with pre-SM2 rates (~ 1%/day). The last PC reading looks a little higher than pre-SM2 (while WF3 looks lower). More data is needed before drawing any conclusions. A report from John Biretta, WFPC2 SMOV IS, is attached to the end of this report. 3. NICMOS Status - nominal - NICMOS was recovered from SUSPEND yesterday and continues to operate nominally. - NICMOS science continues analyzing data from recent internal tests. All looks nominal. - MOSES has been performing dry-runs of the upcoming Pre-Alignment Check-Out (7134) against the BRZ. A meeting to discuss the upcoming SMOV NICMOS SAA test, in light of the recent SUSPEND anomaly, will be rescheduled for 5:30 Monday in order to include John Troeltzsch. 4. STIS Status The scheduled STIS internals continue and data analysis is on-going. All is nominal. The MAMA low voltages remain off, pending the results of the Ball studies. 5. FGS status - no activity 6. FOC/COSTAR status - nominal - no activity PLANNING REPORTS 1. Status of Upcoming SMSs - SMS058 - Currently executing. - SMS062 - Signed off and ready for uplink. - SMS065 - Finals are out for review - SMS069 - Finals are out for review - SMS072 - Built and initials out for review - SMS076 - Built, under internal review - SMS079 - being worked. This SMS currently contains the 1st part of the MAMA HV turn-on, per the nominal plan. 2. Replans - none OPERATIONS STATUS - 1. OPUS - No report 2. Archive - No report ================================================================= The following is a WFPC2 UV sensitivity and focus report from John Biretta: WFPC2 SMOV UPDATE ================== 3/1/97 - John Biretta UV / Contamination Monitor -------------------------- The contamination growth rates continue near the pre-SM2 values. Our sixth F170W monitor point came down late Saturday We now have observations spanning 54 hours since the decontamination. Here are the growth rates expressed as loss per day in F170W throughput, with formal uncertainties: CCD pre-SM2 rate current rate --- --------------- ------------- PC1 0.53% +/- 0.04% 1.6% +/- 0.5% WF3 0.95% +/- 0.02% 0.3% +/- 0.5% The current PC1 rate appears to be somewhat higher than the pre-SM2 rate, but most of this information is contributed by the single most recent observation. It seems premature to draw conclusions from it. A 2% glitch in the flat field, which seems quite plausible in the far-UV, could easily contribute most of the decline in Saturday's point. In contrast, the WF3 rate is quite consistent with the pre-SM2 value. The next F170W observations are Sunday evening and Monday morning. These will nearly double the time baseline, and should considerably reduce the uncertainties. The next scheduled decontamination is day 63 (Monday night - Tuesday). Focus Check ----------- The three WFPC2 focus measurements on Thursday were consistent with the OTA secondary mirror being about +4 microns from the optimal focus, or +2.5 microns from the position desired on day 060. However, at the focus meetings Friday, there was concern over the large scatter (several microns) seen in pre-SM focus data, and over the question of whether the three post-SM observations might suffer some correlated error from long-term OTA breathing effects. A decision was made to take no action at this time (i.e. do not use the focus move opportunity Saturday), and instead to gather more data over the next few weeks. Shireen Gonzaga, Massimo Stiavelli, Max Mutchler, Sylvia Baggett, and John Biretta contributed to the UV data analysis. Matt Lallo and Stefano Casertano did the focus analysis, with many SSD, SM97, and Goddard people attending the focus meetings.
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