Keith Noll
SMOV closure
review
30 Sept 2002
The short and sweet summary:
All requirements have been SATISFIED
NICMOS is BETTER than new!
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.1.1
SMOV Activity: NICMOS-03
Proposal ID: 8974
Requirement Status: SATISFIED
Discussion: The ability to command NICMOS via the RIU,
transmit data via the SDF, and ability to transition between
operational states (Hold, Boot, SAA-Oper, Operate, and Observe)
was verified as a matter of course during routine SMOV
observations.
Serendipitous image of a crowded star field
Camera 2 in H-band (F160W)
FWHM: 2.17 pixels (0.163“)
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.1.2
SMOV Activity: NICMOS-01/02/14
Proposal ID: 8944/ 8973/ 8985
Requirement Status: SATISFIED
Discussion: Operation of all mechanical components (PAM, FOM,
and filter wheel) has been verified.
Filter wheel test
- NICMOS filter wheels have motion sensor only on the motors, not
on the wheels themselves
- Concern about breaking the wheel shaft in case of mechanical
contact/blockage
- careful “two step forward, one step back” approach with analysis
of motor currents and (short) flat field exposures
-side benefit: early measurement of DQE (and more….)
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.2.1
SMOV Activity: NICMOS-10
Proposal ID: 8981
Requirement Status: SATISFIED
Discussion: Aperture locations have been measured and
recalculated.
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.2.2
SMOV Activity: NICMOS-12/13
Proposal ID: 8983/ 8984
Requirement Status: SATISFIED
Discussion: In proposal 8983 a target was successfully acquired
and placed behind the coronagraphic hole. In proposal 8984
targets were placed at dithered positions within the hole to
evaluate locations of optimal performance.
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.3.1
SMOV Activity: NICMOS-11
Proposal ID: 8982
Requirement Status: SATISFIED
Discussion: The NICMOS plate scale has been measured in all
three cameras to precisions of (much) better than 1/5 pixel in each
camera.
PLATE SCALE
We have determined the
plate scale from proposal
8982 using a 9 point
dither
NIC1
x = 0.04326 +/- 0.00001
y = 0.04308 +/0.000002
NIC2
x = 0.07596 +/- 0.00002
y = 0.07537 +/- 0.00002
NIC3
x = 0.2030 +/- 0.0003
y = 0.2025 +/- 0.0003
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.3.2
SMOV Activity: NICMOS-06/07/09
Proposal ID: 8977/ 8980
Requirement Status: SATISFIED
Discussion: Optical alignment has been restored to levels
achieved in cycle 7 for all three cameras. The PAM focus setting
has been measured and trended. Encircled energies have been
measured. Total wavefront error has been reestablished at levels
achieved in cycle 7.
NICMOS focus sweep
Encircled Energy measurements
Y-tilt
Coma correction: NIC1 PAM tilt grid
X-tilt
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.3.3
SMOV Activity: N/A
Proposal ID: N/A
Requirement Status: SATISFIED
Discussion: There is no detectable image motion (jitter) during
normal operations. Jitter has been characterized by other
instruments.
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.4.1
SMOV Activity: NICMOS-14
Proposal ID: 8985
Requirement Status: SATISFIED
Discussion: Flat fields have been measured for all NICMOS
filter/camera combinations. Flat fields have remained stable
relative to cycle 7 with only minor changes due to additional debris
on the detectors. The flat fields continue to be stable.
The first flat field images (in F110W)
Then…
(1998, T=62 K)
Now…
(2002, T= 77K)
NIC1
NIC2
NIC3
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.4.2
SMOV Activity: NICMOS-05/15
Proposal ID: 8976/ 8986
Requirement Status: SATISFIED
Discussion: Instrument throughput has been determined and is
comparable to that observed in cycle 7 after allowing for the
improved quantum efficiency of the detectors at our current
operating temperature. Flux calibration data have been obtained
and are under analysis.
Ratio of Cal Factors
2.00
NCS/Pre-NCS
1.80
1.60
1.40
1.20
1.00
0.80
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
λ(µm)
Camera 1
Camera 2
Camera 3
Photometric calibration factors computed from SMOV data
compared to cycle 7 calibration factors. Differences are due to
change in quantum efficiency at higher operating temperatures in
cycle 11.
2.4
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.4.3
SMOV Activity: NICMOS-15
Proposal ID: 8986
Requirement Status: SATISFIED
Discussion: Photometric stability of 3% or better over one month
has been demonstrated.
Camera 1 -- Repeatability
Flux Time 2 / Flux Time 1
1.050
1.030
1.010
0.990
0.970
0.950
F090M
F110W
F113N
F160W
F166N
F187N
F190N
Filter
Repeatability is within 3% for pairs of photometric observations in
all three cameras.
Camera 2 -- Repeatability
1.050
Flux Time 2 / Flux Time 1
1.040
1.030
1.020
1.010
1.000
0.990
0.980
0.970
0.960
0.950
F110W
F160W
F171M
Filter
F187N
F215N
F222M
Camera 3 -- Repeatability
Flux Time 2 / Flux Time 1
1.050
1.030
1.010
0.990
0.970
0.950
F110W F113N F160W F166N
F187N
Filter
F190N
F215N
F222M
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.4.4
SMOV Activity: N/A
Proposal ID: N/A
Requirement Status: SATISFIED
Discussion: There is no evidence of unusual motion of the image
in the Camera 2 focal plane as measured by the observed location
of the coronagraphic hole in flat fields taken at different epochs.
16 July 2002
3 June 2002
26-28 July 2002
30 May 2002
Location of the coronographic hole in SMOV/cycle 11
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.4.5
SMOV Activity: NICMOS-04
Proposal ID: 8975
Requirement Status: SATISFIED
Discussion: Detector read noise and dark current have been
measured. Read noise is ~ 26 e- for image pairs and linear dark
current is ~0.10-0.15 e-/sec, both well below the required
minimum acceptable levels of 40 e- and 2.5 e-/sec respectively.
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.4.6
SMOV Activity: N/A
Proposal ID: N/A
Requirement Status: SATISFIED
Discussion: The cosmic ray background has been measured and
is comparable to cycle 7 (after allowing for the higher quantum
efficiency at the current operating temperature).
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.4.7
SMOV Activity: NICMOS-18
Proposal ID: 8989
Requirement Status: SATISFIED
Discussion: Thermal emission has been measured over the
duration of SMOV.
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.4.8
SMOV Activity: NICMOS-16/17
Proposal ID: 8987/ 8988
Requirement Status: SATISFIED
Discussion: Cosmic ray persistence has been measured. Decay
timescales are comparable to those observed in cycle 7.
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.4.9
SMOV Activity: NICMOS-19/20
Proposal ID: 8991
Requirement Status: SATISFIED
Discussion: Photometric and wavelength solutions for the G096,
G141, and G206 gratings have been obtained.
Grism
He I 1.083
Ground
[S III]
Hubble 12 G096
Pa α
Grism
Ground
Pa β
Hubble 12 G141
Grism
Ground
He I 2.058
H2
Hubble 12 G206
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: J.10.4.4.4.10
SMOV Activity: N/A
Proposal ID: 8945
Requirement Status: SATISFIED
Discussion: Dark current was measured during cool down when
practical. Although it was not possible to measure darks when
NICMOS was deactivated, it is possible to interpolate with high
confidence. Dark current appears to obey a simple exponential
function of temperature. The “bump” seen during warm up is not
observed.
NICMOS dark current
-analysis indicates that dark
current is nominal (i.e. close
to Cycle 7 values)
- “bump” is NOT observed
Mean: 0.166 e--/s
Mean:0.114
0.148e-/s
e /s
Mean:
Keith Noll
SMOV closure
review
30 Sept 2002
Requirement Number: N/A
SMOV Activity: EROs
Proposal ID: 8933/ 9316
Requirement Status: SATISFIED
Discussion: NICMOS EROs were obtained successfully!
The
Cone
Nebula
by
NICMOS