CCD Clear Imaging - 50CCD
Description
The 50CCD mode is very sensitive for broadband optical imaging. For a fixed exposure time, the ACS WFC with the F606W or F814W will be a better choice for most users. Proposers should be aware that ACS/WFC may be offered as shared risk and receive minimal calibration and support in Cycle 34 (see ACS/WFC Observations in Cycle 33 and Beyond).
Recommended Uses
This filter is recommended for deep imaging where detailed color information is not needed. In most cases, the ACS WFC will be a better choice.
Special Considerations
Very red sources may show significant wings from the detector halo (see Section 7.2.8).
Pivot λ (Å) | FWHM (Å) | AB mag zero point | Speak | Bλ | R80 (arcsec) | Flux in central pixel |
5754.1 | 4333.0 | 26.295 | 2.03e+15 | 4930.6 | 0.16 | 14% |
Figure 14.1: Throughput for 50CCD
Table 14.2: 50CCD Sensitivity & Throughput
λ | Sensitivity | % Throughput |
2400. | 1.41E14 | 2.59 |
2800. | 1.97E14 | 3.08 |
3200. | 3.64E14 | 4.99 |
3600. | 5.01E14 | 6.05 |
4000. | 9.33E14 | 10.24 |
4200. | 1.15E15 | 12.00 |
4400. | 1.30E15 | 12.98 |
4600. | 1.41E15 | 13.44 |
4800. | 1.51E15 | 13.83 |
5000. | 1.60E15 | 14.06 |
5200. | 1.68E15 | 14.21 |
5400. | 1.79E15 | 14.52 |
5600. | 1.88E15 | 14.74 |
5800. | 1.94E15 | 14.68 |
6000. | 1.98E15 | 14.50 |
6200. | 2.01E15 | 14.26 |
6400. | 2.03E15 | 13.93 |
6600. | 2.02E15 | 13.45 |
6800. | 1.99E15 | 12.84 |
7000. | 1.94E15 | 12.16 |
7200. | 1.88E15 | 11.45 |
7400. | 1.81E15 | 10.76 |
7600. | 1.73E15 | 9.99 |
7800. | 1.60E15 | 9.02 |
8000. | 1.46E15 | 7.99 |
8200. | 1.33E15 | 7.12 |
8400. | 1.23E15 | 6.41 |
8600. | 1.17E15 | 5.98 |
9000. | 1.14E15 | 5.55 |
9400. | 1.06E15 | 4.96 |
9800. | 7.95E14 | 3.56 |
10200. | 3.93E14 | 1.69 |
Figure 14.2: Point Source S/N vs. AB magnitude in the V-band for the 50CCD filter. Top curves are for low sky; bottom curves are for average sky. Curves are labeled by required exposure time (seconds).
Figure 14.3: Extended Source S/N vs. AB magnitude in the V-band for the 50CCD filter for gain=1. Top curves are for a source area of 0.2 arcsec2; bottom curves are for 1 arcsec2. Average sky assumed. Curves are labeled by required exposure time (seconds).
Table 14.3: Radial Profile for 50CCD
Radius | Fraction of Energy Encircled | ||
Pixels | Arcsec | Intensity | |
1 | 0.050 | 1.614e-02 | 0.321 |
1.5 | 0.075 | 7.765e-03 | 0.495 |
2 | 0.100 | 4.320e-03 | 0.621 |
3 | 0.150 | 1.629e-03 | 0.787 |
4 | 0.200 | 4.904e-04 | 0.868 |
5 | 0.250 | 1.978e-04 | 0.902 |
10 | 0.500 | 2.499e-05 | 0.964 |
15 | 0.750 | 7.654e-06 | 0.986 |
20 | 1.000 | 2.687e-06 | 0.996 |
Figure 14.4: Point Source PSF for 50CCD, 7."5 square (at pixel 518,517, log scaled, B-V=-0.25).
Figure 14.5: Point Source Encircled Energy for 50CCD
Figure 14.6: Point Source Intensity vs. Radius for 50CCD
-
STIS Instrument Handbook
- • Acknowledgments
- Chapter 1: Introduction
-
Chapter 2: Special Considerations for Cycle 34
- • 2.1 Impacts of Reduced Gyro Mode on Planning Observations
- • 2.2 STIS Performance Changes Pre- and Post-SM4
- • 2.3 New Capabilities for Cycle 34
- • 2.4 Use of Available-but-Unsupported Capabilities
- • 2.5 Choosing Between COS and STIS
- • 2.6 Scheduling Efficiency and Visit Orbit Limits
- • 2.7 MAMA Scheduling Policies
- • 2.8 Prime and Parallel Observing: MAMA Bright-Object Constraints
- • 2.9 STIS Snapshot Program Policies
- Chapter 3: STIS Capabilities, Design, Operations, and Observations
- Chapter 4: Spectroscopy
- Chapter 5: Imaging
- Chapter 6: Exposure Time Calculations
- Chapter 7: Feasibility and Detector Performance
-
Chapter 8: Target Acquisition
- • 8.1 Introduction
- • 8.2 STIS Onboard CCD Target Acquisitions - ACQ
- • 8.3 Onboard Target Acquisition Peakups - ACQ PEAK
- • 8.4 Determining Coordinates in the International Celestial Reference System (ICRS) Reference Frame
- • 8.5 Acquisition Examples
- • 8.6 STIS Post-Observation Target Acquisition Analysis
- Chapter 9: Overheads and Orbit-Time Determination
- Chapter 10: Summary and Checklist
- Chapter 11: Data Taking
-
Chapter 12: Special Uses of STIS
- • 12.1 Slitless First-Order Spectroscopy
- • 12.2 Long-Slit Echelle Spectroscopy
- • 12.3 Time-Resolved Observations
- • 12.4 Observing Too-Bright Objects with STIS
- • 12.5 High Signal-to-Noise Ratio Observations
- • 12.6 Improving the Sampling of the Line Spread Function
- • 12.7 Considerations for Observing Planetary Targets
- • 12.8 Special Considerations for Extended Targets
- • 12.9 Parallel Observing with STIS
- • 12.10 Coronagraphic Spectroscopy
- • 12.11 Coronagraphic Imaging - 50CORON
- • 12.12 Spatial Scans with the STIS CCD
-
Chapter 13: Spectroscopic Reference Material
- • 13.1 Introduction
- • 13.2 Using the Information in this Chapter
-
13.3 Gratings
- • First-Order Grating G750L
- • First-Order Grating G750M
- • First-Order Grating G430L
- • First-Order Grating G430M
- • First-Order Grating G230LB
- • Comparison of G230LB and G230L
- • First-Order Grating G230MB
- • Comparison of G230MB and G230M
- • First-Order Grating G230L
- • First-Order Grating G230M
- • First-Order Grating G140L
- • First-Order Grating G140M
- • Echelle Grating E230M
- • Echelle Grating E230H
- • Echelle Grating E140M
- • Echelle Grating E140H
- • PRISM
- • PRISM Wavelength Relationship
-
13.4 Apertures
- • 52X0.05 Aperture
- • 52X0.05E1 and 52X0.05D1 Pseudo-Apertures
- • 52X0.1 Aperture
- • 52X0.1E1 and 52X0.1D1 Pseudo-Apertures
- • 52X0.2 Aperture
- • 52X0.2E1, 52X0.2E2, and 52X0.2D1 Pseudo-Apertures
- • 52X0.5 Aperture
- • 52X0.5E1, 52X0.5E2, and 52X0.5D1 Pseudo-Apertures
- • 52X2 Aperture
- • 52X2E1, 52X2E2, and 52X2D1 Pseudo-Apertures
- • 52X0.2F1 Aperture
- • 0.2X0.06 Aperture
- • 0.2X0.2 Aperture
- • 0.2X0.09 Aperture
- • 6X0.2 Aperture
- • 0.1X0.03 Aperture
- • FP-SPLIT Slits 0.2X0.06FP(A-E) Apertures
- • FP-SPLIT Slits 0.2X0.2FP(A-E) Apertures
- • 31X0.05ND(A-C) Apertures
- • 0.2X0.05ND Aperture
- • 0.3X0.05ND Aperture
- • F25NDQ Aperture
- 13.5 Spatial Profiles
- 13.6 Line Spread Functions
- • 13.7 Spectral Purity, Order Confusion, and Peculiarities
- • 13.8 MAMA Spectroscopic Bright Object Limits
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Chapter 14: Imaging Reference Material
- • 14.1 Introduction
- • 14.2 Using the Information in this Chapter
- 14.3 CCD
- 14.4 NUV-MAMA
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14.5 FUV-MAMA
- • 25MAMA - FUV-MAMA, Clear
- • 25MAMAD1 - FUV-MAMA Pseudo-Aperture
- • F25ND3 - FUV-MAMA
- • F25ND5 - FUV-MAMA
- • F25NDQ - FUV-MAMA
- • F25QTZ - FUV-MAMA, Longpass
- • F25QTZD1 - FUV-MAMA, Longpass Pseudo-Aperture
- • F25SRF2 - FUV-MAMA, Longpass
- • F25SRF2D1 - FUV-MAMA, Longpass Pseudo-Aperture
- • F25LYA - FUV-MAMA, Lyman-alpha
- • 14.6 Image Mode Geometric Distortion
- • 14.7 Spatial Dependence of the STIS PSF
- • 14.8 MAMA Imaging Bright Object Limits
- Chapter 15: Overview of Pipeline Calibration
- Chapter 16: Accuracies
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Chapter 17: Calibration Status and Plans
- • 17.1 Introduction
- • 17.2 Ground Testing and Calibration
- • 17.3 STIS Installation and Verification (SMOV2)
- • 17.4 Cycle 7 Calibration
- • 17.5 Cycle 8 Calibration
- • 17.6 Cycle 9 Calibration
- • 17.7 Cycle 10 Calibration
- • 17.8 Cycle 11 Calibration
- • 17.9 Cycle 12 Calibration
- • 17.10 SM4 and SMOV4 Calibration
- • 17.11 Cycle 17 Calibration Plan
- • 17.12 Cycle 18 Calibration Plan
- • 17.13 Cycle 19 Calibration Plan
- • 17.14 Cycle 20 Calibration Plan
- • 17.15 Cycle 21 Calibration Plan
- • 17.16 Cycle 22 Calibration Plan
- • 17.17 Cycle 23 Calibration Plan
- • 17.18 Cycle 24 Calibration Plan
- • 17.19 Cycle 25 Calibration Plan
- • 17.20 Cycle 26 Calibration Plan
- • 17.21 Cycle 27 Calibration Plan
- • 17.22 Cycle 28 Calibration Plan
- • 17.23 Cycle 29 Calibration Plan
- • 17.24 Cycle 30 Calibration Plan
- • 17.25 Cycle 31 Calibration Plan
- • 17.26 Cycle 32 Calibration Plan
- • 17.27 Cycle 33 Calibration Plan
- Appendix A: Available-But-Unsupported Spectroscopic Capabilities
- • Glossary