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.

biagetti@stsci.edu

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