Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/instruments/ins_mstr_sched/telescope/Tel_Aberr_PSF_Impact_Data_Sheet.doc Дата изменения: Mon Jan 16 17:39:50 2006 Дата индексирования: Sat Dec 22 21:42:14 2007 Кодировка: Поисковые слова: coma

HST INS Work Item Data Sheet

1. SI/Title: Telescopes/Aberrations & PSF Impacts on Science

2. INS Lead: M. Lallo

3. Description of Work:
Track and analyze coma and astigmatism values from prop 10752.
Investigate dependencies. Analyze aberrations from proposal 9017 (ACS
SMOV), which provided a bright isolated PSF in HRC over 8 orbits
ranging from a hot to cold attitude, and write a report. Identify and
advertise relationships between measured or modeled Zernike variations
and PSF characteristics in science data. Report at 2006 SPIE
conference. Determine A-->f(SMpos) where A is amplitude scale factor
in breathing model relating Light Shield temperatures to FWHM in HRC
pixels. Correlate CCS temperatures at ACS with annual periodicity in
observed astigmatism.

4. Schedule Constraints and Dependencies:
Two papers will be presented at the SPIE meeting in late May

5. Risks and Open Issues:
Risk - Analysis of telemetered temperature data may exceed available
resources.

Risk - Personnel optical expertise may limit the effectiveness of the
characterization.

Risk - The resulting science benefit may be small; this will be better
known by the end of FY06.

6. Priority: High

7. Priority Justification:
ACS PSF morphology is important to certain types of science being done
with the instrument (e.g., weak lensing), and this work will improve
this science. The knowledge gained from this investigation will be
applicable to future mission design, in order to help avoid the same
types of PSF effects. Finally, the group has committed to the SPIE
papers, which has a firm deadline.

8. Resources (including estimated calendar duration for each portion):
a. Development
M. Lallo (0.13 FTE)
R. Makidon (0.08 FTE)
S. Casertano (0.07 FTE)
T. Wheeler (0.04 FTE)

9. Documentation and Deliverables:
Two SPIE papers
ISRs
ACS and Observatory Web Page Updates