hst quarterly review page 1 space telescope science institute 15 october 2003 si status: cos stsci...

HST Quarterly Review

Space Telescope Science Institute

15 October 2003SI Status: COS

STScI COS Program Activity

Subproject STScI Activity

Instrument Development • IDT/STScI MOU• I & T Ball (Thermal-Vac support)

Commanding and Scheduling System

• OP-01• Ops bench testing

Pipeline and Calibration • keyword development• pipeline development• SM4 planning

User Support • COS ETCs • Instr. Handbook development

COS activities are a traditional-mode, new HST instrument development project coordinated with IDT led by PI Jim Green (Colorado)

STScI supports COS science operations by leading development of “front-end” (operations) and “back-end” (OPUS/MAST/calibration) ground system and user support functions..




STScI Support of COS Thermal-Vacuum Testing

• COS Initial Alignment and Verification Thermal-Vac at Ball: 25 June-10 July• COS Thermal-Vacuum Science Calibration at Ball: 22 Sep-21 Oct

NUV testing complete; FUV commences 10 Oct• STScI Thermal-Vac planning and participation

Close coordination of STScI support activities with IDT All STScI COS Instrument Scientists provide onsite support for SI operation, data-

taking, and analysis Keyes, Sembach, Leitherer, Friedman, and Bohlin stand multiple-day shifts during

initial alignment and science calibration Thermal-Vacuum activities; Hartig will “float”

Hartig provides onsite optical alignment support Per STScI/COS IDT MOU STScI provides OPUS processing, conversion to FITS, and

HDA-archival of all COS Thermal-Vacuum data Processed approximately 520 datasets from initial alignment and verification

activities Processed approximately 1200 science calibration datasets to date

• STScI post-test analysis activities Repeatability monitor (Friedman): no anomalies in verification testing Flat fields (Bohlin): verified 1% flatfield and 1% rms per pixel in extracted absorption

line spectrum Keyword processing anomalies (Sembach, Keyes, Friedman, Hartig, Hodge)




STScI Ground Systems and User Support Activities

• STScI scheduling system Flat field commanding updates implementation and local testing completed Bench testing of timing and commanding for all FUV and NUV exposure

modes except target acquisition completed Coordinated parallels now in requirements definition

• Delivered updated Cycle 13 COS mini-Handbook (Sembach); includes post-verification updates

• Spectroscopic APT/ETC implementation underway• SMOV4 requirements defined (Friedman, Keyes); reviewed and

approved by HSTP • Supported SM4 BEA review (Keyes)• STScI COS Bright Object Protection checking software for user support

(ROBOT) development underway




Sample COS FUV Spectrum“A” Segment

Note: segment “B” (not shown) records

remaining half of bandpass

Internal PtNe calibration lamp(no distortion

correction)




Internal PtNe calibration lamp

Sample COS NUV Spectrum

Note: 3 stripes are not continuous in wavelength




500 1000

500

1000

0

Initial NUV External Flatfield Results (September 2003)

COS G185M NUV P-flat (Bohlin)

1.36% Poisson rms

Pixel (cross-dispersion)

Pix

el (d

ispe

rsio

n)

Intrinisic detector scatter (13.25%) within the 100x100 pixel box shown in dashed lines

20,000 - 40,000 counts per pixel in each stripe

C B A

Pix

el (d

ispe

rsio

n)




Initial NUV External Flatfield Results (September 2003)

rms deviation from unity ratio characterizes S/N

Normalized ratio of first half of exposure to second half (Friedman)




TA1 Image (NUV)Double pinhole aperture

1” (~40 pixels) separation

0

10

20

30

40

2010 30 40 50 60

Dis

pers

ion

(pix

els)

Cross Dispersion (pixels)

Images are clearly resolved

Initial Spatial Resolution Results (July 2003)

hst quarterly review page 1 space telescope science institute 15 october 2003 si status: cos stsci...

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