Hubble Space Telescope Goddard Space Flight Center Hubble Ultra-Wide-Field Imager (HUFI) David...

Hubble Space Telescope

Goddard Space Flight Center

LOGO.049

Hubble Ultra-Wide-Field Imager (HUFI)

David Leckrone

Senior Project Scientist for HST

December 16, 2001

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(69 arcmin2)

HUFI(90 arcmin2)

(5.7 arcmin2)

(11.3 arcmin2)

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Field of View

FOV Footprint at CCD FPA

-40

-30

-20

-10

0

10

20

30

40

-110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110

X image (mm)

y i

ma

ge

(m

m)

FOV at CCD CCD 1

CCD 2 CCD 3

4 K x 4 K CCD (3 each)

90 square arcminute FOV

hstfullfd.14,11/14/01, p. 44

4K x 4K CCD’s (3)

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Optical Schematic15:43:51

HST Full Field.14, 11/12/01, p44-45, 90 Scale: 0.09 raw 14-Nov-01

277.78 MM

M1 MirrorM3 Mirror

M2 Mirror

Radial “Pickle”Pick Off Mirror (POM)

HST OTA

CCD FPA

Filters, CCD Shutter Location

Pupil

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Geometric ray trace compared to two-pixel and four-pixel width scale-bars shows a well-corrected design.

09:13:30

0.000,0.202 DG 0.00, 0.86

0.000,0.233 DG 0.00, 1.00

0.000,0.130 DG 0.00, 0.56

0.165,0.165 DG 1.00, 0.71

0.130,0.130 DG 0.79, 0.56

-0.17,0.165 DG-1.00, 0.71

-0.13,0.130 DG-0.79, 0.56

.0893,0.216 DG 0.54, 0.92

.0570,0.130 DG 0.35, 0.56

FIELDPOSITION

DEFOCUSING 0.00000

HST Full Field.14, 11/12/01, p44-45, 90

.300E-01 MM

09:16:27

0.000,0.202 DG 0.00, 0.86

0.000,0.233 DG 0.00, 1.00

0.000,0.130 DG 0.00, 0.56

0.165,0.165 DG 1.00, 0.71

0.130,0.130 DG 0.79, 0.56

-0.17,0.165 DG-1.00, 0.71

-0.13,0.130 DG-0.79, 0.56

.0893,0.216 DG 0.54, 0.92

.0570,0.130 DG 0.35, 0.56

FIELDPOSITION

DEFOCUSING 0.00000

HST Full Field.14, 11/12/01, p44-45, 90

.600E-01 MM

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Optical Performance09:24:39

raw 19-Nov-01DEFOCUSING 0.00000

HST Full Field.14, 1

1/12/01, p44-45, 90

DIAMETER OF CIRCLE (MM)

ENCIRCLED ENERGY

0.0E+00 7.6E-02 1.5E-01 2.3E-01 3.0E-01 3.8E-01 4.5E-01 5.3E-01 6.1E-01 6.8E-01 7.6E-01 0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

(0.000,0.202) DEGREES (0.000,0.233) DEGREES (0.000,0.130) DEGREES (0.165,0.165) DEGREES (0.130,0.130) DEGREES

Diffraction PSF encircled energy @ =632.8 nm for center field and 4 other fieldpositions show that PSF is diffraction-limited and is uniform over full FOV

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Instrument Layout

Pick Off Mirror

M3

M1 Corrector Mechanism

Filter Mechanism

Shutter Mechanism

CCD Heat Pipes

M1

Calibration Door Mechanism

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Instrument Layout

CPL Saddle To AS Radiator

Optical Bench

Radiator

Point C(Point B Opposite Side)

Strut

FGS Enclosure Side

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Instrument Layout

M2

M2 SupportFGS Enclosure

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+V2 SIDE OF HST

FGS3 BAYNCS RADIATOR

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HUFI Design Features

• All-Reflective Design

– Four surfaces – one flat, three powered

• Well-Corrected Aberrations

– Wavefront error 0.0451 to 0.0523 waves rms at 632.8nm

• Flat Focal Surface

– Requires three 4Kx4K CCD’s similar to ACS and WFC3 detectors

• Cooling Via HUFI External Radiator Plus Coupling To NCS Radiator

• Replaces FGS #3 Without Compromising Current Pointing Performance

• Does Not Interfere With Other Instruments

– Amenable to parallel observing

– Follow-up observations with WFC3, COS, ACS, STIS

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HUFI Scientific Performance

• FOV – 90 arcmin2 (8xACS, 16xWFPC2)

• Pixel Scale – 0.10 arcsec (same as WFPC2)

• Sensitivity – Comparable to ACS in I-band, 5x WFPC2 in I-band

• Discovery Efficiency – 8xACS, 80xWFPC2

• SNe Ia Discovery Rate - ~1 per day with follow-up

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POTENTIAL OBSERVING STRATEGY

• 3-6 Month campaigns dedicated to high galactic latitude fields

• Deep exposures with WFC3, COS, ACS broken into multiple visits – HUFI parallel exposures for “free”

• SN detected in HUFI fields followed with other HST instruments

– STIS spectra for redshifts and classifications up to z=1.2

– WFC3 near-IR images and grism spectroscopy up to 1.7 microns

– ACS higher resolution images for host galaxy morphology

200 SNe la + M = 10%200 SNe la

200 SNe la + MAP + Ho = 10%200 SNe la

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Wild Field Planetary Camera 2COSTARGyrosSolar Arrays

Launch!

Imaging SpectrographNear Infrared CameraFine Guidance Sensor

GyrosAdvanced ComputerFine Guidance Sensor

Advanced CameraSolar ArraysPower Control UnitNICMOS Cooling System

Wide Field Camera 3Fine Guidance SensorAft Shroud Cooling SystemBatteriesGyros

SM1

SM2

SM3A

SM3B

SM4End ofMission

?HUBBLE

MISSIONSHUBBLE

MISSIONS

1990 1993 1997 1999 2002 20042010

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RETIREMENT OPTIONS FOR HST

• One Shuttle flight allocated to HST after Servicing Mission 4 in 2004

• Current baseline plan is to return HST to the ground in 2010

– Exhibit in National Air & Space Museum

– Requires partial disassembly and disposal of multiple pieces in orbit (e.g. solar arrays, external radiators, possibly instruments)

– 5 EVA mission

– Requires HST to be stable and commandable

– Less than 50/50 chance that HST will function to 2010

• Alternative option

– “Light” servicing mission in 2007 instead of 2010

– Maximizes probability of zero downtime between HST and NGST

– Attach propulsion module to HST for end-of-mission controlled re-entry

– Provides possible opportunity for new instrument, e.g. HUFI

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.0

.5

1.0

0 1 2 3 4 5 6 7

Elapsed Time - Years

Pro

ba

bil

ity

Probability of HST Science Operations vs. Time Since Last Servicing Mission

9/10/01 HST Reliability Indicator from theRefined Aerospace Corporation Model

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SUMMARY

• We’ve identified an instrument design which provides a major increase in FOV compared to prior HST cameras

• A systematic campaign should yield ~1 SNe per day with follow up provided by full suite of HST instruments

• Flight opportunity requires change in current baseline retirement plan for HST and willingness of Code S to support a new HST instrument

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Thermal Block Diagram

NCSRadiator

ExistingInserts

40 wattsto AS

120 watts to NCS Radiatorusing HP/VCHP to carryheat from CEB and CCDs

90 watts electronics tomodified “door radiator”

using HPs

HUFIRadial SI

“New”Radiator/

Door

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Power Flow

NCSRadiator

Diode BoxAuxilary

Power Ports

60 wattsFrom HST

190 watts from NCS Radiatorauxiliary power supply

HUFIRadial SI

Total estimated power requirement of 250 W

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Hubble Space Telescope Goddard Space Flight Center Hubble Ultra-Wide-Field Imager (HUFI) David...

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