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| FFFFFF OOOOOO SSS |
STScI | FF OO OO SS | STAN - FOS
Analysis | FFFF OO OO SS | Number 5
News | FF OO OO SS | February 1995
| FF OOOOOO SSS |
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CONTENTS:

- NEW VERSION OF RPS2 AVAILABLE

- CALIBRATION WORKSHOP

- FOS NEWS

- INSTRUMENT SCIENCE REPORTS
+ Location of FOS Spectra: Cycle 4 (CAL/FOS 133)
+ Cycle 3 FOS Redside Superflats (CAL/FOS 134)

- RECENT FOS PREPRINTS

- APPENDIX: FOS CONTACTS

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

NEW VERSION OF RPS2 AVAILABLE
-----------------------------
by Karla Peterson (PRESTO)

A new version of RPS2 was released on February 21. It corrects most of the
posted advisories and has enhanced schedulability tables (targets will appear
to be easier to schedule, in particular those with low declination).

We strongly recommend that you upgrade to this new release unless you have
already finished and submitted your proposal. There is no need to reprocess the
submission in this case.

You can find more information about the specific advisories which are corrected
in this release in the document:

http://presto.stsci.edu/public/rps2advisories/rps2prob-rel2.html

General information about RPS2 (and the links to the software) are in:

http://presto.stsci.edu/public/rps2home.html

Two configurations of this release of RPS2 are available:

sun4lisp-RPS2bin.tar.Z
sun4-RPS2bin.tar.Z

The first one (which is the one we recommend to install) is a stand-alone
version and will run all the tasks locally in your computer. As this version
requires 75MB to install (38MB installed and ready to run), and is
computationally intensive, you can choose the second one that only runs certain
tasks locally. The rest of the processes are run remotely on STScI computers.
The results of both configurations are the same, you should not notice any
differences in the output.

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FOS NEWS
--------
by Jeffrey Hayes

The FOS has been operating nominally. Seventeen GO proposals and six
calibration programs were successfully carried out. In addition, the Reuse
Target Offset acquisition strategy was carried out twice in the last month. In
both cases, the acquisition was successful, and the accuracy continues to be on
the order of 0.03".

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CALIBRATION WORKSHOP
--------------------

A workshop on calibrating HST data obtained after the servicing mission will be
held at the Space Telescope Science Institute in Baltimore from May 15th to
May 17th 1995.

The topics will include reviews about:

- Instrument performance and status
- Changes in the calibration pipeline
- Instrument specific information (break away groups)
- Update on Pre-COSTAR calibrations
- Access to old calibration information for archive users
- Preview of new instruments
- New data analysis tools

In addition, contributed papers or posters are invited from all participants.

If you are interested in participating, we request that you fill out the
following questionnaire and return it by e-mail to etkins@stsci.edu. By doing
so you will be added to the mailing list and receive further announcements, the
final program and detailed logistics information.

----------------------------8<--------------------------------------------------

Please keep me on your mailing list for the workshop CALIBRATING HUBBLE SPACE
TELESCOPE: POST SERVICING MISSION in May 1995.

Name:

Institution:

Address:

Phone:

Fax:

e-mail:


The likelihood for my attendance is (check one):
> 75%:
25% - 75%:
< 25%:

I will probably want to give a presentation:
Oral:
Poster:
Title if available:

The break away groups that I plan on attending:
WFPC2:
FOC:
FOS:
GHRS:

Please send this completed form to etkins@stsci.edu. Thank you
----------------------------8<--------------------------------------------------

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

INSTRUMENT SCIENCE REPORTS
--------------------------

``Location of FOS Spectra: Cycle 4'' (CAL/FOS 133) outlines where the optimal
locations for spectra are for all detector/grating combinations for Cycle 4.
These positions were delivered to the Project Data Base, and became effective
on 4 Nov 1994. The analysis further shows that there is a spatial drift with
time in the positions of spectra for all gratings observed with the FOS/BLUE
detector, while the locations of the spectra for all gratings with the FOS/RED
detector are scattered.

The uncertainties in the locations of the spectra have affected both ACQ/BIN
pointing accuracy and FOS photometric accuracy. The size of these uncertainties
with ACQ/BIN has forced us to follow ACQ/BIN with a time-consuming ACQ/PEAK to
improve the target centering for science with all apertures smaller than 1.0".

The photometric quality of the data, especially for FOS/RED and the 1.0
aperture, are compromised due to the large fluctuations in the location of the
spectrum. Further, this is not a simple matter of losing light, but the effect
is also wavelength dependent. On average, assuming that the locations of the
spectra are known to an accuracy of only 20 YBASE units, for the large
apertures (greater than or equal to 1.0") we can lose 3% of the photometry for
point sources and can lose up to 20% for extended objects! The electronic
version of this report can be downloaded from

http://www.stsci.edu/ftp/instrument_news/FOS/pub/fos_isr133.ps

``Cycle 3 FOS Redside Superflats'' (CAL/FOS 134) describes a new set of FOS
flat fields correcting pre-COSTAR redside single aperture observations.
Application of the files to standard star observations taken before 1994
indicate that the new flat field files should be used for reprocessing single
aperture data for gratings G190H, G270H, and G150L taken after August 7, 1992,
and single aperture data for gratings G400H, G570H, G670L, and the prism after
June 18, 1992. The abstract of this report is available at:

http://www.stsci.edu/ftp/instrument_news/FOS/pub/fos_isr134_a.txt

Paper copies of these documents can be requested at etkins@stsci.edu.

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

RECENT FOS PREPRINTS
--------------------

We draw your attention to these papers, based on FOS 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.

"The albedo spectrum of Europa from 2200 A to 3300A"
Noll, K., Weaver, H.A. and Gonnella, A.M., JGR - Planets, in press

"Extragalactic symbiotic systems. II. Hubble Space Telescope observations of
S 63 and Ln 358"
Vogel, M. and Nussbaumer, H., A&A accepted

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

APPENDIX: FOS contacts
-----------------------

Any questions about the scheduling of your observations should be addressed to
your PRESTO contact. If you do not know who this person is, PRESTO's Mosaic
page (http://presto.stsci.edu/public/propinfo.html) contains that information.


Post-Observation questions should be addressed to the FOS Team, or
analysis@stsci.edu (410-338-1082).

FOS TEAM
--------

Instrument Scientists:

Michael Dahlem dahlem@stsci.edu 410-338-4733
Jeffrey Hayes hayes@stsci.edu 410-338-4936
Anuradha Koratkar koratkar@stsci.edu 410-338-4470
Charles D. (Tony) Keyes keyes@stsci.edu 410-338-4975 Group Lead


Technical Assistants:

Jennifer Christensen christen@stsci.edu 410-338-1265
Stephan Martin smartin@stsci.edu 410-338-4724

http://www.stsci.edu/ftp/instrument_news/FOS/topfos.html

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Comments, questions, requests for issues, additions or deletions to the mailing
list, etc. can be e-mailed to analysis@stsci.edu
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The Space Telescope Science Institute is operated by the Association of
Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.
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