STScI Logo

Hubble Space Telescope
NICMOS STScI Analysis Newsletter 15

NICMOS STScI Analysis Newsletter 15

November 1998

CONTENTS:

       
        - NICMOS NEWS
          + New NICMOS Information on the WWW
          + NICMOS standards
	  + NICMOS End-of-Life monitoring
	  + NICMOS Prime Science Observations Update
	  + NICMOS at the January 1999 Texas AAS Meeting

        - RECENT PREPRINTS

        - APPENDIX:  NICMOS CONTACTS
 
============================================================================
  
New NICMOS Information on the WWW
---------------------------------
	by Doris Daou

Similar to all Space Telescope Instruments, the NICMOS home page on
the World Wide Web is updated with all instrument developments. The
NICMOS home page can be found by visiting the STScI WWW page
(http://www.stsci.edu/) and following Observing links to the NICMOS
Web pages.
 
Since last month, the following items have been newly posted:
	NICMOS Photometry Page
	NICMOS Parallel Program Page
	NICMOS PlateScale Page
	NICMOS Coronographic Hole Page
	NICMOS Focus Page
	NICMOS Image ANOMALIES
	
Since last month, the following Advisories have been posted:
	Optical Ghosts Anomalies

Since last month, the following ISRs have been published:
	ISR-98-018: 
	TinyTim modeling of NICMOS PSF subtraction:
	effects of focus breathing , cold mask wiggling, and color variations
	(Suchkov & J. Krist, November 11, 1998)

	ISR-98-017:
	Methodologies to Calibrating NICMOS Polarimetry Characteristics
	(Lisa Mazzuca, Bill Sparks, Dave Axon, November 24, 1998)


NICMOS standards
----------------

The NICMOS web pages present the NICMOS Absolute photometry
and Photometric monitoring results. Also a table of NICMOS standards and
Current Values for NICMOS Photometric Keywords and Zeropoint in the
Vega Magnitude system are presented in these pages. These tables are
in the process of being updated. We have found a ~0.1 mag discrepancy
between he ground-based J, H, K values for the solar analogs and the
white dwarf that we used and the corresponding published values
(Persson et al. 1998, AJ, 116, 2475).

 
NICMOS End-of-Life monitoring
-----------------------------

As part of the NICMOS End-of-Life (EOL) calibration program,
the NICMOS group has been monitoring the temperature and its
effects on the darks, the flat fields and the focus for each
camera. Over the last ~40 days, since the monitoring programs 
have started, the temperature increase has been about 0.1 K. This
temperature increase refers to the dewar aft end. This change
has not affected the NICMOS darks, flat fields or focus, as the
data still look nominal. The cryogens are not exhausted yet
and that the instrument is still scientifically viable.


NICMOS Prime Science Observations Update
----------------------------------------
	by Al Schultz 
	
The nominal end-of-science (EOS) with NICMOS as the prime instrument
was November 15, 1998. The date was chosen as the EOS target date to
allow STScI to schedule NICMOS prime science observations
well in advance of the expected cryogen exhaustion. The predicted
cryogen exhaustion date is December 31, 1998 +/- 1 month. Many 
of the Cycle 6 and 7 WFPC2 and Cycle 7 STIS observations were 
delayed beyond the NICMOS EOS date to make room on the calendars
for NICMOS observations. These delayed observations are now 
being scheduled and executed.

More than 99% of all GO/GTO/DD NICMOS prime science observations 
were executed before the EOS date. Also, all NICMOS calibration
programs have been executed. NICMOS end-of-life (EOL) calibration
monitor programs, discussed in last month's NICMOS STAN-14, will
continue to be executed until cryogen exhaustion.

After the EOS date, no NICMOS SNAP observations are being scheduled 
to accommodate the monitoring programs and only those NICMOS
prime science visits restricted due to orient or time
constraints as well as repeats for approved Hubble 
Operation Problem Reports (HOPRs) were scheduled for execution.
A total of 21 orbits of NICMOS prime science observations were
planned to execute after the EOS date, and the last NICMOS
prime science observation is scheduled to execute on Friday,
December 18, 1998 starting at 16:18 UT.


NICMOS at the January 1999 Texas AAS Meeting
--------------------------------------------
	by Al Schultz

A total of 44 NICMOS citations are listed for the
January 1999 AAS Meeting #193 - Austin, Texas.  Presentations
include NICMOS observations of BL Lacertae Objects, nuclei
of galaxies, radio galaxies, AGNs, Faint Galaxies in the far field,
and NICMOS parallel observations in support of the HDF-South.
Closer to home, there will be presentations of observations
of Planetary and Proto-Planetary Nebulae, Pulsars and Supernovae,
Young Stars, and brown dwarfs and extrasolar planets.  There
will be a report from the NICMOS GTO Environments of Nearby Stars
(EONS) team about the coronagraphic programs to detect brown dwarfs
and giant planets about the nearby stars and the detection with
NICMOS of IRAF inferred circumstellar disks.

Check out AAS Session 36, HST Instrumentation.  There are three
presentations devoted to help NICMOS observers reduce their
data.

36.04 NICMOS Data Reduction and Analysis 
    A. Nota, H. A. Bushouse (STScI), NICMOS Team 

36.05 Photometry with NICMOS 
    D. Calzetti, M. E. Dickinson, L. E. Bergeron (STScI), L. Colina 
(STScI/ESA) 
 
36.06 Cosmic Ray and Photon Image Persistence in NICMOS, and Ways to
Reduce its Effects. 
    L. E. Bergeron (STScI), J. R. Najita (NOAO) 


============================================================================
 
                         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.

KRIST, J.E.; GOLIMOWSKI, D.A.; SCHROEDER, D.J.; HENRY T.J.
"Characterization and Subtraction of Well-Exposed
HST/NICMOS Camera 2 Point Spread Functions for a Survey of
Very-Low-Mass Companions to Nearby Stars"  PASP 9-98
www.stsci.edu/science/preprints/prep1263/prep1263.html
 
LOWRANCE, P.J.; MCCCARTHY, C.; BECKLIN, E.E.; ZUCKERMAN,
B.; SCHNEIDER, G.; WEBB, R.A.; HINES, D.C.; KIRKPATRICK,
J.D.; KOERNER, D.W.; LOW, F.; MEIER, R.; RIEKE, M.; SMITH,
B.A.; TERRILE, R.J.; THOMPSON, R.I.  "A Candidate
Substellar Companion to CoD -33 deg. 7795 (TWA 5)"  ApJ
 
TREU, T.; STIAVELLI, M.; WALKER, A.R.; WILLIAMS, R.E.;
BAUM, S.A.; BERNSTEIN, G.; BLACKER, B.S.; CAROLLO, C.M.;
CASERTANO, S.; DICKINSON, M.E.; DE MELLO, D.F.; FERGUSON,
H.C.; FRUCHTER, A.S.; LUCAS, R.A.; MACKENTY, J.; MADAU, P.;
POSTMAN, M.  "An Extremely Red R(1/4) Galaxy in the Test
Image of the Hubble Deep Field South"  A&A accepted
http://www.stsci.edu/science/preprints/prep1299/prep1299.html
 
HINES, D.C.; LOW, F.J.; THOMPSON, R.I.; WEYMANN, R.J.;
STORRIE-LOMBARDI, L.J.  "The Host Galaxy of the BALQSO
PG1700+518 and Its Ring Galaxy Companion: NICMOS 1.6 micron
Imaging"  ApJ 2-10-99
 
WALBORN, N.R.; BARBA, R.H.; BRANDNER, W.; RUBIO, M.;
GREBEL, E.K.; PROBST, R.G.  "Some Characteristics of
Current Star Formation in the 30 Doradus Nebula Revealed by
HST/NICMOS"  AJ 1-99
http://www.stsci.edu/science/preprints/prep1288/prep1288.html
 

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

                     APPENDIX: NICMOS Contacts
                     -------------------------
 
Any questions about the scheduling of your observations should be
addressed to your Program Coordinator. Post-Observation questions can
be addressed to your Contact Scientist. If you do not know who these
persons are, you can find the information on the WWW at
http://www.stsci.edu/public/propinfo.html.
  
Analysis, STSDAS or any other HST-related questions can also be
addressed to help@stsci.edu.
============================================================================
To subscribe or unsubscribe send a message to majordomo@stsci.edu with
the Subject: line blank and the following in the body:
  
                    [un]subscribe nicmos_news 
  
============================================================================
Comments, questions, suggestions, etc. can be e-mailed to help@stsci.edu.
============================================================================
The Space Telescope Science Institute is operated by the Association of
Universities for Research in Astronomy, Inc., under NASA contract
NAS5-26555.
============================================================================