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SPACE TELESCOPE SCIENCE INSTITUTE
Summary: 17 August - 9 October 1995

TIPS: 12 October 1995 FOS Keyes

Instrument: Nominal operation; three reports of noisy diodes; one valid Acquisition: 27 successful; 1 failure; 1 affected by GS Acq problem Science: 22 GO/GTO programs; 1 lost due to ACQ/BIN failure Calibration: 3 programs (Cycle 5 darks, YBASEs, and wavelengths) Publications and Updates: delivery of new YBASE settings and AIS reference files Other: Polarimetry status update; TAC PC training and feasibility consulting; IS Reviews, new group member, Alex Storrs


SPACE TELESCOPE SCIENCE INSTITUTE

TIPS: 12 October 1995 FOS Keyes

Instrument Status (17 August - 9 October 1995):
FOS instrumental operation mostly nominal Diodes: - three -

first-time noisy diodes reported; FOS/BL diode 22 : GOs alerted; FOS/BL diode 138 - reported by FOS/BL diode 148 - reported by

one added to "watch list" modify CALFOS scattered-light algorithm GO, resolved as noisy data OPUS, resolved as background

Target Acquisitions: - one failed to single star guiding; 0.14 arcsec drift - one ACQ/BIN failed due to incorrectly specified target brightness and target coordinates.


SPACE TELESCOPE SCIENCE INSTITUTE

TIPS: 12 October 1995 FOS Keyes

Publications/CDBS/PDB Updates (since 17 August 1995):
New YBASEs delivered - effective 16 October 1995 includes all detector/disperser combinations and supported polarimetric modes; routine periodic update - normal trending continues. Initial Average-Inverse-Sensitivity (AIS) Method reference files and supporting tables delivered - effective after pipeline verification

Other:
Instrument status change for polarimetry. Training session for TAC Panel Coordinators - training document available. Feasibility review consulting ongoing with TAC PCs. HST Data Handbook revision continues. New FOS Instrument Scientist, Alex Storrs (410) 338-4903, storrs@stsci.edu


SPACE TELESCOPE SCIENCE INSTITUTE
AIS Flux Calibration Method :

TIPS: 12 October 1995 FOS Keyes

- establishes pipeline and STSDAS flux-calibration method accurate to <3% (with properly centered observations) - uses Bohlin absolute flux calibration standard system - system described in ISR CAL/FOS-144 (Bohlin, Lindler, & Keyes) and in "Spectrophotometric Standards from the Far-UV to the Near-IR on the White Dwarf Scale," Bohlin, submitted to A.J. - starts with "average" 4.3 aperture sensitivity for each detector/disperser - included in AIS reference file (science header keyword AISHFILE) - accounts for aperture throughput as function of wavelength - included in CCSB reference table - accounts for time-dependence of sensitivity at each wavelength - included in CCSD reference table - for the pre-COSTAR case, tracks focus change history and accounts for its impact on aperture throughput - included in CCSA and CCSC reference tables, respectively.


SPACE TELESCOPE SCIENCE INSTITUTE
Polarimetry Status Changes:

TIPS: 12 October 1995 FOS Keyes

- FOS Cycle 6 Instrument Handbook advised usage of FOS/RD for polarimetry - Preliminary analysis of FOS/RD calibration indicated limiting accuracy for linear polarization of 1-1.5% - FOS/BL has limiting accuracy of 0.7% (and a goal of 0.2% through further calibration seems achievable) - effective 1 September, recommended to all proposers/users to switch to FOS/BL for all high-precision polarimetric observatons - all current PIs and the FOS STAN mailing list were notified - full description of status change placed on FOS WWW page. - all current un-executed FOS polarimetry programs changed without significant science impact (2 FOS/RD programs had already executed) - detailed FOS/RD calibration analysis continuing


SPACE TELESCOPE SCIENCE INSTITUTE

TIPS: 12 October 1995 FOS Keyes

Panel Coordinator FOS Feasibility Training Summary:
- described major aspects of FOS program feasibility review - summary "cookbook" document is available from FOS group - indicates major problem areas when an IS should ALWAYS be called - appropriate to Phase I and Phase II reviews - includes summary checklist - describes bright object evaluation - target acquisition analysis - includes requirements as function of specific science goals - comparison of FOS/BL and GHRS G140L capabilities - brief description of instrument and important operating modes - contains certain features specific to Phase I (e.g., orbit budgeting evaluation)


SPACE TELESCOPE SCIENCE INSTITUTE

TIPS: 12 October 1995 FOS Keyes

The SSD FOS Group
Name Charles (Tony) Keyes Anuradha Koratkar Michael Dahlem Jeffrey Hayes Alex Storrs Jennifer Christensen Stephan Martin Title Group Lead Instrument Scientist Instrument Scientist Instrument Scientist Instrument Scientist Data Analyst Data Analyst Telephone (410) 338-4975 (410) 338-4470 (410) 338-4733 (410) 338-4936 (410) 338-4903 (410) 338-1265 (410) 338-4724 e-mail keyes@stsci.edu koratkar@stsci.edu dahlem@stsci.edu hayes@stsci.edu storrs@stsci.edu christen@stsci.edu smartin@stsci.edu