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Servicing Mission Observatory Verification

The baseline SMOV plan for NICMOS consisted of the 22 activities as listed in Table 15.1. Some of these (e.g., 1 through 6) test specific components of the instruments while others characterize its performance within the HST environment (e.g., 7, 8, 17, and 22). Activities 12 and 13 align the NICMOS fore-optics; activities 9, 10, 11, and 21 enable the use of the coronograph in Camera 2; activities 15 and 20 characterize the detectors; and activities 18 and 19 establish the initial photometric calibration.

Tests to agressively monitor focus and to explore the trade off between performing coronographic observations with the NIC2 detector or the coronographic hole (on the field divider) in focus were added during SMOV. Further, a number of Early Release Observations of scientifically interesting targets were obtained to communicate the capabilities of NICMOS to the astronomical community and the public. These observations are (or, in the case of some EROs will soon be) in the public domain and can be easily located in the HST archive under the starview "general" screen field "Proposal Type" equal to "SM2/NIC".

Table 15.1: Planned NICMOS SMOV Activities

Activity

Title

Demonstrates or Calibrates

1

NICMOS to Hold Mode

Basic operation of computer and HST interfaces.

2

NICMOS Internal Parallel Test

Demonstrate absence of interference due to parallel operation of camera and filter wheels.

3

NICMOS Memory Load and Dump Test

Test memory and code in internal computer.

4

NICMOS Field Offset Mechanism Test

Test and characterize operation and optical performance of the Field Offset Mirror.

5

NICMOS Filter Wheel Mechanisms Test

Verify operation and correct location of each position on each filter wheel.

6

NICMOS SAA Contour Test

Characterize effects of radiation on NICMOS electronics and detector performance; determine optimal SAA limits.

7

NICMOS Dewar Heaters Setpoint Adjustment

Establish optimal external dewar temperature.

8

NICMOS Transfer Function Test

Set optimal detector DC offset voltages.

9

NICMOS Target Acquisition Test

Demonstrate Mode 2 (autonomous) acquisitions.

10

NICMOS to FGS Astrometric Calibration

Establish the locations of the NICMOS detectors within the FGS coordinate system.

11

NICMOS Plate Scale and Astrometric Calibration

Determine plate scales, relative field rotations, and field distortions for each camera.

12

NICMOS Coarse Optical Alignment

Initial focus and tip/tilt adjustment of the Pupil alignment mirror based on modeled images.

13

NICMOS Fine Optical Alignment

Optimal positioning of the PAM based on grid of small PAM motions.

14

NICMOS Point Spread Function Characterization

Characterization of the imaging performance of NICMOS and initial set of PSF observations.

15

NICMOS Persistence Test

Characterize the effect of severe overexposure of the NICMOS detectors.

16

NICMOS Intflat Transfer and Stability Test

Demonstration of flat fielding capability and stability monitoring. Bootstrap of SLTV flat fields.

17

NICMOS HST Thermal Background Test

Characterization of HST generated thermal background over a broad range of situations.

18

NICMOS Absolute Photometry Test

Standard star observations across NICMOS wavelength range. Updates SLTV throughput calibration.

19

NICMOS Differential Photometry Test

Inter-camera photometric precision and stability test obtained from observations of a star at 25 positions.

20

NICMOS Detector Noise and Dark Characterization

Characterization of detector noise and dark current. Verification of stability since SLTV.

21

Coronograph Verification

Optical characterization of coronographic stray light rejection and PSF of the obscured star.

22

Limb Avoidance Determination

Determination of the appropriate bright and dark earth limb angle restrictions for normal and low-background NICMOS observations.

Table 15.1: Planned NICMOS SMOV Activities
Activity	Title	Demonstrates or Calibrates
1	NICMOS to Hold Mode	Basic operation of computer and HST interfaces.
2	NICMOS Internal Parallel Test	Demonstrate absence of interference due to parallel operation of camera and filter wheels.
3	NICMOS Memory Load and Dump Test	Test memory and code in internal computer.
4	NICMOS Field Offset Mechanism Test	Test and characterize operation and optical performance of the Field Offset Mirror.
5	NICMOS Filter Wheel Mechanisms Test	Verify operation and correct location of each position on each filter wheel.
6	NICMOS SAA Contour Test	Characterize effects of radiation on NICMOS electronics and detector performance; determine optimal SAA limits.
7	NICMOS Dewar Heaters Setpoint Adjustment	Establish optimal external dewar temperature.
8	NICMOS Transfer Function Test	Set optimal detector DC offset voltages.
9	NICMOS Target Acquisition Test	Demonstrate Mode 2 (autonomous) acquisitions.
10	NICMOS to FGS Astrometric Calibration	Establish the locations of the NICMOS detectors within the FGS coordinate system.
11	NICMOS Plate Scale and Astrometric Calibration	Determine plate scales, relative field rotations, and field distortions for each camera.
12	NICMOS Coarse Optical Alignment	Initial focus and tip/tilt adjustment of the Pupil alignment mirror based on modeled images.
13	NICMOS Fine Optical Alignment	Optimal positioning of the PAM based on grid of small PAM motions.
14	NICMOS Point Spread Function Characterization	Characterization of the imaging performance of NICMOS and initial set of PSF observations.
15	NICMOS Persistence Test	Characterize the effect of severe overexposure of the NICMOS detectors.
16	NICMOS Intflat Transfer and Stability Test	Demonstration of flat fielding capability and stability monitoring. Bootstrap of SLTV flat fields.
17	NICMOS HST Thermal Background Test	Characterization of HST generated thermal background over a broad range of situations.
18	NICMOS Absolute Photometry Test	Standard star observations across NICMOS wavelength range. Updates SLTV throughput calibration.
19	NICMOS Differential Photometry Test	Inter-camera photometric precision and stability test obtained from observations of a star at 25 positions.
20	NICMOS Detector Noise and Dark Characterization	Characterization of detector noise and dark current. Verification of stability since SLTV.
21	Coronograph Verification	Optical characterization of coronographic stray light rejection and PSF of the obscured star.
22	Limb Avoidance Determination	Determination of the appropriate bright and dark earth limb angle restrictions for normal and low-background NICMOS observations.

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