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Hubble Space Telescope
NICMOS STScI Analysis Newsletter 23

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              |  N   N IIIII CCCCC M       M OOOOOO   SSS  |
  STScI       |  NN  N   I   CC    MM     MM OO  OO  SS    | STAN - NICMOS
  Analysis    |  N N N   I   CC    M M   M M OO  OO   SS   | Number 23 
  News        |  N  NN   I   CC    M  M M  M OO  OO    SS  | July 2000
              |  N   N IIIII CCCCC M   M   M OOOOOO  SSS   |
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CONTENTS:


        - NICMOS NEWS
          + NICMOS not available in Cycle 10
          + Installation of the NICMOS FSW 4.0C

        - RECENT PREPRINTS

        - APPENDIX:  NICMOS CONTACTS

============================================================================  
				
				NICMOS NEWS
				-----------

NICMOS not available in Cycle 10
--------------------------------

Because of the delay in the servicing mission SM3B, now scheduled for 
November 2001, NICMOS will not be available for Cycle 10. The instrument, 
which is expected to be revived with the installation of the NICMOS Cooling 
System, will be offered to observers in Cycle 11.

This update is to notify potential Cycle 10 proposers that due to
changes in the 2001 HST servicing mission (SM3b) launch date and the
planned SM activities, proposals for ACS (Advanced Camera for Surveys)
and NICMOS (Near Infrared Camera and Multi Object Spectrometer)
observations will not be accepted for Cycle 10.


Installation of the NICMOS FSW 4.0C
-----------------------------------
	A. Schultz, E. Bergeron, W. Baggett

The NICMOS flight software (FSW) was modified to handle Timing
Pattern Generator (TPG) resents. A TPG reset occurs when a spurious
signal is generated.  This was traced to a component (Opto-Isolator)
on the TPG board. An opto-isolator is an electronic component used to
reduce electronic noise in a signal path by electrically isolating one 
part of a circuit from another. This isolation is accomplished by converting
electrical pulses to optical pulses and back again. An energetic cosmic 
ray or charged particle could have triggered a TPG reset. In the past
a TPG reset would have suspended the instrument. The new FSW detects
a TPG reset, sets a flag, and allows the observations in the other two
NICMOS cameras to continue. Stored command instructions will conditionally
recover NICMOS from this condition during normal instrument mode transitions.
NICMOS data that are affected by a TPG reset are flagged in OPUS.
The NICMOS keyword EXPFLAG is set to read DETOFF any time a TPG reset
occurs.

NICMOS was commanded to observe on June 19, 2000 and on June 30, 2000.
A series of MULTIACCUM and ACCUM darks observations were executed as 
part of the flight software (FSW 4.0C) installation. The NICMOS
detectors have not been operated and the Pupil Alignment Mechanism (PAM)
exercised since the exhaustion of the dewar cryogen in January 1999.
The PAM directs light from the telescope onto the NICMOS re-imaging
mirror. The detectors were very warm (temperature ~230K) and the darks
were not scientifically useful. Real-time monitoring of the dark 
observations indicates that NICMOS is healthy and functioning as expected.

The darks were saturated and the zero-read bias levels were consistent
with the high temperature. The shading was well behaved and as expected.
Counter to expectations, there was no signal accumulation for the
MULTIACCUM observations. The detectors were flushed followed by the
first read, the zeroth read (0.203 sec). The reads were non-destructive,
and the zeroth read was saturated. All of the 26 reads for the MULTIACCUM
observations had the same amount of signal. Either the dark current is 
saturating every pixel in the arrays in the zeroth read, or the well-depth
has dropped to nearly zero. This indicates at a temperature of 230 K, the
detectors are not useful for science observations.


=============================================================================

                         RECENT PREPRINTS
                         ----------------

We draw your attention to these papers, based on NICMOS data, that
will appear in the next few months.  This list includes all preprints 
received by the STScI Library not yet published in the journals.
Please remember to include our Library in your preprint distribution list.

WILSON, A.S.; SHOPBELL, P.L.; SIMPSON, C.;
STORCHI-BERGMANN, T.; BARBOSA, F.K.B.; WARD, M.J.
"Hubble Space Telescope Imaging of the Circinus
Galaxy" AJ 9-00

DOWNES, R.A.; DUERBECK, H.W. "Optical Imaging of
Nova Shells and the Maximum Magnitude-Rate of
Decline Relationship" AJ 10-00

MARTIN, E.L.; BRANDNER, W.; BOUVIER, J.; LUHMAN,
K.L.; STAUFFER, J.; BASRI, G. "Membership and
Multiplicity Among Very Low-Mass Stars and Brown
Dwarfs in the Pleiades Cluster" ApJ 11-00

NAJITA, J.R.; TIEDE, G.P.; CARR, J.S. "From Stars
to Super-Planets: the Low-Mass IMF in the Young
Cluster IC348" ApJ 10-00

BRANDNER, W.; ZINNECKER, H.; ALCALA, J.M.; ALLARD,
F.; COVINO, E.; FRINK, S.; KOHLER, R.; KUNKEL, M.;
MONETI, A.; SCHWEITZER, A. "Timescales of Disk
Evolution and Planet Formation: HST, Adaptive
Optics, and ISO Observations of Weak-Line and
Post-T Tauri Stars" AJ 8-00
http://arXiv.org/abs/astro-ph/0005048

CORBIN, M.R.; O'NEIL, E.; THOMPSON, R.I.; RIEKE,
M.J.; SCHNEIDER, G. "A Color Analysis of the NICMOS
Parallel Image Archive" AJ accepted

GOLIMOWSKI, D.A.; HENRY, T.J.; KRIST, J.E.;
SCHROEDER, D.J.; MARCY, G.W.; FISCHER, D.A.;
BUTLER, R.P. "The Very Low Mass Component of the
Gliese 105 System" AJ 10-00

LOWRANCE, P.J.; SCHNEIDER, G.; KIRKPATRICK, J.D.;
BECKLIN, E.E.; WEINBERGER, A.J.; ZUCKERMAN, B.;
PLAIT, P.; MALUMUTH, E.; HEAP, S.; SCHULTZ, A.;
SMITH, B.A.; TERRILE, R.J.; HINES, D.C. "A
Candidate Substellar Companion to HR 7329" ApJ
accepted

REIPURTH, B.; YU, K.C.; HEATHCOTE, S.; BALLY, J.;
RODRIGUEZ, L.F. "Hubble Space Telescope NICMOS
Images of Herbig-Haro Energy Sources: [FeII] Jets,
Binarity, and Envelope Cavities"


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                     APPENDIX: NICMOS Contacts
                     -------------------------

Analysis, STSDAS or any other HST-related questions can be
addressed to help@stsci.edu.
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