The following parameters refer to the telescope design as specified for Phase C. Additional Phase C reference files are available at GSFC. These include the field-of-view layout, detector properties, distortions, Zernike decompositions of the PSFs, pupil masks, transmission/effective area per filter, and more. Additional Coronagraph Instrument parameters and data are also available.
These spacecraft/instrument parameters, which are to be used in simulations and in designing science projects, are tied to a regular project design schedule (see the link to parameters in earlier mission phases below). To ensure consistency within the community, these parameters are released here only after approval by the Roman Space Telescope Project Scientist.
List of Previous Spacecraft and Instrument Parameters.
Name | Value | Unit | Description |
---|---|---|---|
Mission_Duration_Requirement | 5 | years | Mission duration requirement |
Mission_Duration_Goal | 10 | years | Mission duration goal |
Mission_Launch_Site | Cape Canaveral Air Force Station, Florida | Launch site | |
Spacecraft_Operating_Temperature | 298 | K | Operating temperature of the spacecraft |
Spacecraft_Orbit_Type | Sun-Earth L2 | Type of spacecraft orbit | |
Spacecraft_Downlink_Rate | 275 | Mbps | Spacecraft downlink rate |
Spacecraft_Downlink_Volume | 11 | Tbits/day | Spacecraft downlink volume |
Spacecraft_Slew_Angle_Gap_Fill | 0.025 | degrees | Gap fill slew angle |
Spacecraft_Slew_Time_Gap_Fill | 21.4 | seconds | Gap fill slew time |
Spacecraft_Slew_Angle_Short_FoV | 0.4 | degrees | Shorter side of field-of-view slew angle (six reaction wheel operation) |
Spacecraft_Slew_Time_Short_FoV | 49.3 | seconds | Shorter side of field-of-view slew time (including the settle time; six reaction wheel operation) |
Spacecraft_Slew_Angle_Long_FoV | 0.8 | degrees | Long side of field-of-view slew angle (six reaction wheel operation) |
Spacecraft_Slew_Time_Long_FoV | 67.4 | seconds | Long side of field-of-view slew time (including the settle time; six reaction wheel operation) |
Spacecraft_Slew_Angle_Microlensing_Maximum | 2.06 | degrees | Maximum microlensing slew angle (six reaction wheel operation) |
Spacecraft_Slew_Time_Microlensing_Maximum | 99 | seconds | Maximum microlensing slew time (including the settle time; six reaction wheel operation) |
Spacecraft_Slew_Time_Two_Degrees | 99 | seconds | Two degree slew time (including the settle time; six reaction wheel operation) |
Spacecraft_Slew_Time_Five_Degrees | 162 | seconds | Five degree slew time (including the settle time; six reaction wheel operation) |
Spacecraft_Slew_Time_Ten_Degrees | 267 | seconds | Ten degree slew time (including the settle time; six reaction wheel operation) |
Spacecraft_Slew_Time_Thirty_Degrees | 667 | seconds | Thirty degree slew time (including the settle time; six reaction wheel operation) |
Spacecraft_Slew_Time_Ninety_Degrees | 1865 | seconds | Thirty degree slew time (including the settle time; six reaction wheel operation) |
Spacecraft_Slew_Settling_Time_Small | 10+slew angle (degrees) | seconds | Spacecraft settling time after a slew of less than ten degrees |
Spacecraft_Slew_Settling_Time_Large | 20 | seconds | Spacecraft settling time after a slew of more than ten degrees |
Name | Value | Unit | Description |
---|---|---|---|
Telescope_Jitter | 12 | milliarcsec | Telescope jitter for high frequencies (vibration modes in the optics) per axis (rms) |
Telescope_Drift | 8 | milliarcsec | Telescope drift at frequencies within the Attitude Control System's bandwidth per axis (rms) |
Telescope_Primary_Diameter | 2.36 | m | Diameter of the telescope primary mirror |
Telescope_Primary_Mirror_Temperature | 265 | K | Telescope primary mirror temperature |
Telescope_Central_Obscuration | 30.3 | % | Linear obscuration of the telescope entrance pupil (diameter ratio) |
Telescope_Allowed_Pitch_Range | 54-126 | degrees | Allowed telecope pitch range towards (0 degrees) the Sun and away (180 degrees) from the Sun |
Telescope_Allowed_Yaw_Range | 0-360 | degrees | Allowed telecope yaw range about the Sun line |
Telescope_Allowed_Roll_Range | -15-+15 | degrees | Allowed telecope roll about the line of sight (off maximum power roll angle) |
Name | Value | Unit | Description |
---|---|---|---|
WFI_Correlated_Noise | 5 | e- | WFI detector correlated noise floor |
WFI_Count_Rate_Zody_Minimum_F062 | 0.27 | Count rate per pixel in the F062 filter at minimum zodiacal light | |
WFI_Count_Rate_Zody_Minimum_F087 | 0.27 | Count rate per pixel in the F087 filter at minimum zodiacal light | |
WFI_Count_Rate_Zody_Minimum_F106 | 0.29 | Count rate per pixel in the F106 filter at minimum zodiacal light | |
WFI_Count_Rate_Zody_Minimum_F129 | 0.28 | Count rate per pixel in the F129 filter at minimum zodiacal light | |
WFI_Count_Rate_Zody_Minimum_F158 | 0.26 | Count rate per pixel in the F158 filter at minimum zodiacal light | |
WFI_Count_Rate_Zody_Minimum_F184 | 0.15 | Count rate per pixel in the F184 filter at minimum zodiacal light | |
WFI_Count_Rate_Zody_Minimum_F146 | 0.85 | Count rate per pixel in the F146 filter at minimum zodiacal light | |
WFI_Count_Rate_Zody_Minimum_F213 | 0.13 | Count rate per pixel in the F213 filter at minimum zodiacal light | |
WFI_Count_Rate_Zody_Minimum_Prism | 0.95 | Count rate per pixel in the Prism at minimum zodiacal light | |
WFI_Count_Rate_Zody_Minimum_Grism | 0.65 | Count rate per pixel in the Grism at minimum zodiacal light | |
WFI_Dark_Current | < 0.1 | e-/s/pixel | WFI detector dark current per pixel (requirement) |
WFI_Detector_Guide_Star_Update_Rate | ~5.8 | Hz | Guide star update rate |
WFI_Detector_Type | H4RG-10 | Detector type for WFI | |
WFI_Detector_Quantum_Efficiency_Long | >80 | % | WFI detector quantum efficiency (requirement; average over wavelengths between 0.8 and 2.1 microns |
WFI_Detector_Quantum_Efficiency_Short | >60 | % | WFI detector quantum efficiency (requirement; average over wavelengths between 0.6 and 0.8 microns |
WFI_Detector_Readout_Time | 3.04 | sec | Sensor Chip Assembly full frame readout time |
WFI_Detector_Pixel_Operability | >95 | % | WFI detector pixel operability (requirement) |
WFI_Detector_Total_Crosstalk | <12 | % | WFI detector total crosstalk (requirement) |
WFI_Detector_Total_Noise_180s | 5-6 | electrons | WFI detector total noise (rms uncertainty in slope fit for an exposure time of 180 sec) |
WFI_Detector_Inter_Pixel_Capacitance | 0.9119 | WFI detector inter-pixel capacitance (fraction of a pixel-centered total charge of 1 actually deposited in the central pixel) | |
WFI_Detector_Full_Frame_Readout_Time | 2.74 | seconds | WFI detector full frame readout time |
WFI_Field_Of_View_Effective | 0.281 | deg2 | WFI total effective field of view (ignoring gaps between detectors) |
WFI_Field_Of_View_Total | 0.32 | deg2 | WFI total field of view (including gaps between detectors) |
WFI_Focal_Ratio | 7.9 | WFI instrument and telescope's combined focal ratio | |
WFI_Number_Of_Active_Columns | 4088 | pixel | Number of active detector columns (also known as the number of pixels in the x-direction) in (the image section of) a detector |
WFI_Number_Of_Active_Rows | 4088 | pixel | Number of active detector rows (also known as the number of pixels in the y-direction) in (the image section of) a detector |
WFI_Jitter_Wavefront_Error | < 0.707 | nm | Telescope intermediate focus wavefront error jitter (requirement) |
WFI_Image_Stability | 1.0 | nm | RMS wave front error (WFE) variation in 180 sec |
WFI_Pixel_Scale | 0.11 | arcsec | WFI detector pixel scale in arcseconds/pixel |
WFI_Pixel_Size | 10 | 10-6 m | WFI wide-field channel pixel size in each dimension |
WFI_PSF_Ellipticity | < 0.00047 | WFI point spread function ellipticity per 184 seconds at WFI focus | |
WFI_Readout_Noise | < 20 | e- | WFI detector pixel readout noise rms for correlated double sampling (two successive detector readouts) |
WFI_Temperature | < 100 | K | WFI detector operating temperature |
WFI_Number | 18 | Total number of scientific detectors in WFI |
Name | Value | Unit | Description |
---|---|---|---|
WFI_Filter_F062_Center | 0.620 | 10-6 m | WFI filter F062 central wavelength |
WFI_Filter_F087_Center | 0.869 | 10-6 m | WFI filter F087 central wavelength |
WFI_Filter_F106_Center | 1.060 | 10-6 m | WFI filter F106 central wavelength |
WFI_Filter_F129_Center | 1.293 | 10-6 m | WFI filter F129 central wavelength |
WFI_Filter_F158_Center | 1.577 | 10-6 m | WFI filter F158 central wavelength |
WFI_Filter_F184_Center | 1.842 | 10-6 m | WFI filter F184 central wavelength |
WFI_Filter_F213_Center | 2.125 | 10-6 m | WFI filter F213 central wavelength |
WFI_Filter_F146_Center | 1.464 | 10-6 m | WFI filter F146 central wavelength |
WFI_Filter_F062_Resolving_Power | 2.2 | WFI filter F062 resolving power | |
WFI_Filter_F087_Resolving_Power | 4 | WFI filter F087 resolving power | |
WFI_Filter_F106_Resolving_Power | 4 | WFI filter F106 resolving power | |
WFI_Filter_F129_Resolving_Power | 4 | WFI filter F129 resolving power | |
WFI_Filter_F158_Resolving_Power | 4 | WFI filter F158 resolving power | |
WFI_Filter_F184_Resolving_Power | 5.81 | WFI filter F184 resolving power | |
WFI_Filter_F213_Resolving_Power | 6.07 | WFI filter F213 resolving power | |
WFI_Filter_F146_Resolving_Power | 1.42 | WFI filter F146 resolving power | |
WFI_Filter_F062_Wavelength_Range | 0.480-0.760 | 10-6 m | WFI filter F062 wavelength range |
WFI_Filter_F087_Wavelength_Range | 0.760-0.977 | 10-6 m | WFI filter F087 wavelength range |
WFI_Filter_F106_Wavelength_Range | 0.927-1.192 | 10-6 m | WFI filter F106 wavelength range |
WFI_Filter_F129_Wavelength_Range | 1.131-1.454 | 10-6 m | WFI filter F129 wavelength range |
WFI_Filter_F158_Wavelength_Range | 1.380-1.774 | 10-6 m | WFI filter F158 wavelength range |
WFI_Filter_F184_Wavelength_Range | 1.683-2.000 | 10-6 m | WFI filter F184 wavelength range |
WFI_Filter_F213_Wavelength_Range | 1.950-2.300 | 10-6 m | WFI filter F213 wavelength range |
WFI_Filter_F146_Wavelength_Range | 0.927-2.000 | 10-6 m | WFI filter F146 wavelength range |
WFI_Filter_Wavelength_Blank | WFI blank for dark current, flat field and other calibrations with internal light source |
Name | Value | Unit | Description |
---|---|---|---|
WFI_Grism_Dispersion | 1.04-1.14 | nm/pixel | WFI Grism dispersion, dependent mostly on the FPA Y value in degrees (Y axis is positive towards payload origin and FPA Y axis origin is between detectors 1 and 10) as -0.1945Y + 1.0764. |
WFI_Grism_Wavelength_Range_G150 | 1.00-1.93 | 10-6 m | WFI Grism wavelength range |
WFI_Grism_Spectral_Resolving_Power_G150 | 461lambda | WFI Grism resolving power (lambda in microns; two pixels) |
Name | Value | Unit | Description |
---|---|---|---|
WFI_Prism_Wavelength_Range_P127 | 0.75-1.80 | 10-6 m | WFI prism wavelength range |
WFI_Prism_Spectral_Resolving_Power_P127 | 80-180 | WFI Prism resolving power (delta lambda = two pixels) |
Name | Value | Unit | Description |
---|---|---|---|
WFI_Sensitivity_Grism_Point_Source_Short | 21.0 | AB mag | WFI Grism limiting point source sensitivity (10-sigma per pixel in continuum) at 1.2 microns in 1 hour of exposure time, zodiacal light set at twice the minimum value |
WFI_Sensitivity_Grism_Point_Source_Long | 20.7 | AB mag | WFI Grism limiting point source sensitivity (10-sigma per pixel in continuum) at 1.5 microns in 1 hour of exposure time, zodiacal light set at twice the minimum value |
WFI_Sensitivity_Prism_Point_Source_Short | 22.2 | AB mag | WFI prism limiting point source sensitivity (10-sigma per pixel in continuum) at 0.8 microns in 1 hour of exposure time, zodiacal light set at twice the minimum value |
WFI_Sensitivity_Prism_Point_Source_Medium | 23.0 | AB mag | WFI prism limiting point source sensitivity (10-sigma per pixel in continuum) at 1.2 microns in 1 hour of exposure time, zodiacal light set at twice the minimum value |
WFI_Sensitivity_Prism_Point_Source_Long | 23.0 | AB mag | WFI prism limiting point source sensitivity (10-sigma per pixel in continuum) at 1.5 microns in 1 hour of exposure time, zodiacal light set at twice the minimum value |
WFI_Sensitivity_F062_Point_Source | 28.6 | AB mag | WFI filter F062 limiting point source sensitivity (5-sigma) in 1 hour of exposure time, zodiacal light set at twice the minimum value |
WFI_Sensitivity_F087_Point_Source | 28.2 | AB mag | WFI filter F087 limiting point source sensitivity (5-sigma) in 1 hour of exposure time, zodiacal light set at twice the minimum value |
WFI_Sensitivity_F106_Point_Source | 28.1 | AB mag | WFI filter F106 limiting point source sensitivity (5-sigma) in 1 hour of exposure time, zodiacal light set at twice the minimum value |
WFI_Sensitivity_F129_Point_Source | 28.0 | AB mag | WFI filter F129 limiting point source sensitivity (5-sigma) in 1 hour of exposure time, zodiacal light set at twice the minimum value |
WFI_Sensitivity_F158_Point_Source | 28.0 | AB mag | WFI filter F158 limiting point source sensitivity (5-sigma) in 1 hour of exposure time, zodiacal light set at twice the minimum value |
WFI_Sensitivity_F184_Point_Source | 27.5 | AB mag | WFI filter F184 limiting point source sensitivity (5-sigma) in 1 hour of exposure time, zodiacal light set at twice the minimum value |
WFI_Sensitivity_F213_Point_Source | 26.2 | AB mag | WFI filter F213 limiting point source sensitivity (5-sigma) in 1 hour of exposure time, zodiacal light set at twice the minimum value |
WFI_Sensitivity_F146_Point_Source | 28.3 | AB mag | WFI filter F146 limiting point source sensitivity (5-sigma) in 1 hour of exposure time, zodiacal light set at twice the minimum value |
WFI_Sensitivity_110_Point_Source_Emission_Line | 5.7 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a point source at 1.1 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_110_Extended_Source_Emission_Line | 11.0 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a source with half light radius = 0.2 arcsec at 1.1 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_120_Point_Source_Emission_Line | 4.3 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a point source at 1.2 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_120_Extended_Source_Emission_Line | 8.2 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a source with half light radius = 0.2 arcsec at 1.2 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_130_Point_Source_Emission_Line | 3.8 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a point source at 1.3 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_130_Extended_Source_Emission_Line | 7.1 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a source with half light radius = 0.2 arcsec at 1.3 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_140_Point_Source_Emission_Line | 3.6 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a point source at 1.4 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_140_Extended_Source_Emission_Line | 6.7 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a source with half light radius = 0.2 arcsec at 1.4 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_150_Point_Source_Emission_Line | 3.6 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a point source at 1.5 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_150_Extended_Source_Emission_Line | 7.0 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a source with half light radius = 0.2 arcsec at 1.5 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_160_Point_Source_Emission_Line | 3.9 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a point source at 1.6 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_160_Extended_Source_Emission_Line | 7.2 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a source with half light radius = 0.2 arcsec at 1.6 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_170_Point_Source_Emission_Line | 4.2 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a point source at 1.7 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_170_Extended_Source_Emission_Line | 7.2 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a source with half light radius = 0.2 arcsec at 1.7 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_180_Point_Source_Emission_Line | 5.0 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a point source at 1.8 microns, zodiacal light set at twice the minimum value |
WFI_Sensitivity_180_Extended_Source_Emission_Line | 8.4 | 10-17 ergs cm-2sec-1 | WFI emission line detected at 6.5-sigma in one hour for a source with half light radius = 0.2 arcsec at 1.8 microns, zodiacal light set at twice the minimum value |
Name | Value | Unit | Description |
---|---|---|---|
CGI_Mode_Imaging_N | Narrow FoV imaging. Currently implemented as HLC coronagraph + Band 1 filter + imaging camera | ||
CGI_Mode_Imaging_W | Wide FoV imaging. Currently implemented as SPC_A coronagraph + Band 4 filter + imaging camera | ||
CGI_Mode_Spectroscopy | Single Slit, Prism-based Spectroscopy. Currently implemented as SPC_B coronagraph + Band 3 filter + Spectroscopy |
Name | Value | Unit | Description |
---|---|---|---|
CGI_Coronagraph_HLC | HLC = Hybrid Lyot Coronagraph | ||
CGI_Coronagraph_SPC_A | SPC_A = Shaped Pupil Coronagraph for large outer working angle in an annular field of view | ||
CGI_Coronagraph_SPC_B | SPC_B = Shaped Pupil Coronagraph for small inner working angle in a `bowtie' shaped field of view | ||
CGI_Coronagraph_Inner_Working_Angle_HLC | 3 | lambda/D | Inner radius of region of highest contrast |
CGI_Coronagraph_Inner_Working_Angle_SPC_A | 5.9 | lambda/D | Inner radius of region of highest contrast |
CGI_Coronagraph_Inner_Working_Angle_SPC_B | 3 | lambda/D | Inner radius of region of highest contrast |
CGI_Coronagraph_Outer_Working_Angle_HLC | 9.7 | lambda/D | Outer radius of region of highest contrast |
CGI_Coronagraph_Outer_Working_Angle_SPC_A | 20.1 | lambda/D | Outer radius of region of highest contrast |
CGI_Coronagraph_Outer_Working_Angle_SPC_B | 9.1 | lambda/D | Outer radius of region of highest contrast |
CGI_Coronagraph_Annular_Size_HLC | 360 | degrees | Suppression region annular extent |
CGI_Coronagraph_Annular_Size_SPC_A | 360 | degrees | Suppression region annular extent |
CGI_Coronagraph_Annular_Size_SPC_B | 130 | degrees | Suppression region annular extent |
Name | Value | Unit | Description |
---|---|---|---|
CGI_Bandpass_Center1 | 573.8 | nm | Central wavelength for bandpass 1 |
CGI_Bandpass_FWHM1 | 56.5 | nm | Nominal FWHM (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 1 |
CGI_Bandpass_Center2 | 659.4 | nm | Central wavelength for bandpass 2 |
CGI_Bandpass_FWHM2 | 110.9 | nm | Nominal FWHM (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 2 |
CGI_Bandpass_Center3 | 729.3 | nm | Central wavelength for bandpass 3 |
CGI_Bandpass_FWHM3 | 122.3 | nm | Nominal FWHM (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 3 |
CGI_Bandpass_Center4 | 825.5 | nm | Central wavelength for bandpass 4 |
CGI_Bandpass_FWHM4 | 96.8 | nm | Nominal FWHM (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 4 |
CGI_Bandpass_ND_2pt25_FPAM | 102.25 | Attenuation factor of Neutral Density filter used for target acquisition (ND 2.25) mounted in FPAM | |
CGI_Bandpass_ND_4pt75_FPAM | 104.75 | Attenuation factor of Neutral Density filter used for target acquisition (ND 4.75) mounted in FPAM | |
CGI_Bandpass_ND_4pt75_FSAM | 104.75 | Attenuation factor of Neutral Density filter used for target acquisition (ND 4.75) mounted in FSAM |
Name | Value | Unit | Description |
---|---|---|---|
CGI_Bandpass_Engineering_Center1a | 554.8 | nm | Central wavelength for engineering filter 1a (WFSC), Wavefront Sensing and Control (WFSC) |
CGI_Bandpass_Engineering_FWHM1a | 18 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 1a |
CGI_Bandpass_Engineering_Center1b | 574.5 | nm | Central wavelength for engineering filter 1b (WFSC) |
CGI_Bandpass_Engineering_FWHM1b | 18 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 1b |
CGI_Bandpass_Engineering_Center1c | 594.7 | nm | Central wavelength for engineering filter 1c (WFSC) |
CGI_Bandpass_Engineering_FWHM1c | 19 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 1c |
CGI_Bandpass_Engineering_Center2a | 614.2 | nm | Central wavelength for engineering filter 2a |
CGI_Bandpass_Engineering_FWHM2a | 21.6 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 2a |
CGI_Bandpass_Engineering_Center2b | 639.4 | nm | Central wavelength for engineering filter 2b |
CGI_Bandpass_Engineering_FWHM2b | 15.1 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 2b |
CGI_Bandpass_Engineering_Center2c | 656 | nm | Central wavelength for engineering filter 2c |
CGI_Bandpass_Engineering_FWHM2c | 6.2 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 2c |
CGI_Bandpass_Engineering_Center3a | 680.6 | nm | Central wavelength engineering filter 3a (Spectroscopy calibration) |
CGI_Bandpass_Engineering_FWHM3a | 24.9 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 3a |
CGI_Bandpass_Engineering_Center3b | 702.3 | nm | Central wavelength engineering filter 3b (Spectroscopy calibration) |
CGI_Bandpass_Engineering_FWHM3b | 23 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 3b |
CGI_Bandpass_Engineering_Center3c | 725.9 | nm | Central wavelength engineering filter 3c (Spectroscopy calibration) |
CGI_Bandpass_Engineering_FWHM3c | 20 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 3c |
CGI_Bandpass_Engineering_Center3g | 752.5 | nm | Central wavelength engineering filter 3g (Spectroscopy calibration) |
CGI_Bandpass_Engineering_FWHM3g | 24.1 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 3g |
CGI_Bandpass_Engineering_Center3d | 753.3 | nm | Central wavelength engineering filter 3d (Spectroscopy calibration) |
CGI_Bandpass_Engineering_FWHM3d | 7.2 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 3d |
CGI_Bandpass_Engineering_Center3e | 777.1 | nm | Central wavelength engineering filter 3e (Spectroscopy calibration) |
CGI_Bandpass_Engineering_FWHM3e | 27.1 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 3e |
CGI_Bandpass_Engineering_Center4a | 791.7 | nm | Central wavelength for engineering filter 4a (WFSC) |
CGI_Bandpass_Engineering_FWHM4a | 29.8 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 4a |
CGI_Bandpass_Engineering_Center4b | 823.9 | nm | Central wavelength for engineering filter 4b (WFSC) |
CGI_Bandpass_Engineering_FWHM4b | 28 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 4b |
CGI_Bandpass_Engineering_Center4c | 856.5 | nm | Central wavelength for engineering filter 4c (WFSC) |
CGI_Bandpass_Engineering_FWHM4c | 30.2 | nm | Nominal FWHM [nm] (from 50% peak transmission cut-on to 50% peak transmission cut-off wavelength) for bandpass 4c |
Name | Value | Unit | Description |
---|---|---|---|
CGI_Detector_Model | T-e2v CCD 311 | Detector make and model | |
CGI_Detector_Pixel_Number_X | 1056 | The EXCAM image array size in detector pixels in x-dimension for imaging and spectroscopy | |
CGI_Detector_Pixel_Number_Y | 1037 | The EXCAM image array size in detector pixels in y-dimension for imaging and spectroscopy | |
CGI_Detector_Pixel_Size | 13 | 10-6 m | Pixel size of CGI detector pixels in each dimension, both imaging and spectroscopy |
CGI_Detector_Pixel_Scale | 0.0218 | arcsec/pixel | Coronagraph imaging pixel scale, Nyquist sampled (lambda/2D) at 500 nm |
CGI_Detector_Readnoise | 120 | e- | Current best estimate read noise when using the electron multiplying (EM) gain in photon counting mode |
CGI_Detector_Saturation | 80000 | e- | CGI detector image area full well, current best estimate |
CGI_Detector_Dark_Current_BOL_CBE | 0.05 | e-/pixel/hr | Mean CGI dark current for T = 168 K (beginning of life current best estimate) |
CGI_Detector_Dark_Current_EOL_CBE | 0.10 | e-/pixel/hr | Mean CGI dark current for T = 168 K (end of life current best estimate) |
CGI_Detector_Clock_Induced_Charge_BOL | 0.016 | e-/pixel/frame | CGI clock-induced charge (beginning of life), 10 MHz horizontal frequency; 1 MHz vertical frequency; serial clock swing < 10 V |
CGI_Detector_Clock_Induced_Charge_EOL | 0.030 | e-/pixel/frame | CGI clock-induced charge (end of life), 10 MHz horizontal frequency; 1 MHz vertical frequency; serial clock swing < 10 V |
CGI_Detector_Quantum_Efficiency_442 | 62.8 | % | The EXCAM quantum efficiency at 442 nm |
CGI_Detector_Quantum_Efficiency_450 | 69.5 | % | The EXCAM quantum efficiency at 450 nm |
CGI_Detector_Quantum_Efficiency_488 | 77.9 | % | The EXCAM quantum efficiency at 488 nm |
CGI_Detector_Quantum_Efficiency_580 | 83.7 | % | The EXCAM quantum efficiency at 580 nm |
CGI_Detector_Quantum_Efficiency_685 | 73.7 | % | The EXCAM quantum efficiency at 685 nm |
CGI_Detector_Quantum_Efficiency_730 | 64.0 | % | The EXCAM quantum efficiency at 730 nm |
CGI_Detector_Quantum_Efficiency_830 | 41.2 | % | The EXCAM quantum efficiency at 830 nm |
CGI_Detector_Quantum_Efficiency_885 | 26.4 | % | The EXCAM quantum efficiency at 885 nm |
CGI_Detector_Quantum_Efficiency_950 | 11.6 | % | The EXCAM quantum efficiency at 930 nm |
CGI_Detector_Quantum_Efficiency_980 | 6.8 | % | The EXCAM quantum efficiency at 980 nm |
Name | Value | Unit | Description |
---|---|---|---|
CGI_Imaging_FoV | 7.2 | arcsec | Unvignetted coronagraph imaging field-of-view diameter without coronagraph masks |
Name | Value | Unit | Description |
---|---|---|---|
CGI_Spectroscopy_FoV | 4 | arcsec | Unvignetted FoV diameter without masks in each spectral channel |
CGI_Spectroscopy_Footprint_Of_Dispersed_Point_Source_Band2 | 42x4 | pixels | Spectroscopic footprint of dispersed point source in pixels; the smaller axis (cross-dispersion) includes only the main lobe of the PSF |
CGI_Spectroscopy_Footprint_Of_Dispersed_Point_Source_Band3 | 47x4 | pixels | Spectroscopic footprint of dispersed point source in pixels; the smaller axis (cross-dispersion) includes only the main lobe of the PSF |
CGI_Spectroscopy_Band2_Short_Slit_Width | 0.115 | arcsec | Band 2 spectroscopy slit width for 2lambda/D wide, 6lambda/D long "short" slit |
CGI_Spectroscopy_Band2_Short_Slit_Height | 0.345 | arcsec | Band 2 spectroscopy slit height for 2lambda/D wide, 6lambda/D long "short" slit |
CGI_Spectroscopy_Band2_Tall_Slit_Width | 0.115 | arcsec | Band 2 spectroscopy slit width for 2lambda/D wide, 10lambda/D long "tall" slit |
CGI_Spectroscopy_Band2_Tall_Slit_Height | 0.575 | arcsec | Band 2 spectroscopy slit height for 2lambda/D wide, 10lambda/D long "tall" slit |
CGI_Spectroscopy_Band3_Short_Slit_Width | 0.127 | arcsec | Band 3 spectroscopy slit width for 2lambda/D wide, 6lambda/D long "short" slit |
CGI_Spectroscopy_Band3_Short_Slit_Height | 0.381 | arcsec | Band 3 spectroscopy slit height for 2lambda/D wide, 6lambda/D long "short" slit |
CGI_Spectroscopy_Band3_Tall_Slit_Width | 0.127 | arcsec | Band 3 spectroscopy slit width for 2lambda/D wide, 10lambda/D long "tall" slit |
CGI_Spectroscopy_Band3_Tall_Slit_Height | 0.635 | arcsec | Band 3 spectroscopy slit height for 2lambda/D wide, 10lambda/D long "tall" slit |
CGI_Spectroscopy_Bands23_Mean_Short_Slit_Width | 0.243 | arcsec | Bands 2-3 mean (695 nm) spectroscopy slit width for 4lambda/D wide, 6lambda/D long "short" slit |
CGI_Spectroscopy_Bands23_Mean_Short_Slit_Height | 0.3645 | arcsec | Bands 2-3 mean (695 nm) spectroscopy slit height for 4lambda/D wide, 6lambda/D long "short" slit |
CGI_Spectroscopy_Bands23_Mean_Tall_Slit_Width | 0.243 | arcsec | Bands 2-3 mean (695 nm) spectroscopy slit width for 4lambda/D wide, 10lambda/D long "tall" slit |
CGI_Spectroscopy_Bands23_Mean_Tall_Slit_Height | 0.6075 | arcsec | Bands 2-3 mean (695 nm) spectroscopy slit height for 4lambda/D wide, 10lambda/D long "tall" slit |
CGI_Spectroscopy_Spectral_Resolution | 50 | lambda/(delta lambda) | Spectral resolution at the centers of Band 2 (660 nm) and Band 3 (730 nm) |
Name | Value | Unit | Description |
---|---|---|---|
CGI_Polarimetry_FoV | 3.8 | arcsec | Unvignetted FoV diameter without masks in each polarization angle |
CGI_Polarimetry_Wollaston_Prism1 | 0 and 90 | degrees | Polarization angles for the first Wollaston prism |
CGI_Polarimetry_Wollaston_Prism2 | 45 and 135 | degrees | Polarization angles for the second Wollaston prism |
Name | Value | Unit | Description |
---|---|---|---|
CGI_Predicted_Performance_Imaging_N_Contrast_Pred | 3.07x10-9 | Predicted planet-to-star flux ratio for an SNR=5 imaging detection in band 1 with HLC, 100hr integration, after post-processing at a separation of 4.39lambda/D (=216.94 mas). This prediction is based on modeling and error budgeting of Nancy Grace Roman Space Telescope observatory and CGI, including: observatory and instrument stability during CGI con-ops, coronagraph starlight suppression performance, detector properties, and post-processing gains. Coronagraph and detector models have been validated against experimental results. Does not include model uncertainty factors on observatory or coronagraph performance (i.e., MUF=1) | |
CGI_Predicted_Performance_Imaging_W_Contrast_Pred | 2.39x10-9 | Predicted planet-to-star flux ratio for an SNR=5 imaging detection in band 4 with SPC, 100hr integration, after post-processing at a separation of 6lambda/D (=432.63 mas). This prediction is based on modeling and error budgeting of Nancy Grace Roman Space Telescope observatory and CGI, including: observatory and instrument stability during CGI con-ops, coronagraph starlight suppression performance, detector properties, and post-processing gains. Coronagraph and detector models have been validated against experimental results. Does not include model uncertainty factors on observatory or coronagraph performance (i.e., MUF=1) | |
CGI_Predicted_Performance_Spectroscopy_Contrast_Pred | 5.00x10-9 | Predicted planet-to-star flux ratio for an SNR=5 spectrum in band 3 with SPC_B (bowtie), 100hr integration, after post-processing at a separation of 4.39lambda/D (=280.09 mas). This prediction is based on modeling and error budgeting of Nancy Grace Roman Space Telescope observatory and CGI, including: observatory and instrument stability during CGI con-ops, coronagraph starlight suppression performance, detector properties, and post-processing gains. Coronagraph and detector models have been validated against experimental results. Does not include model uncertainty factors on observatory or coronagraph performance (i.e., MUF=1) | |
CGI_Predicted_Performance_45offaxis_scattered_light | 3.4x10-9 | Scattered light flux ratio per resolution element from a source 45 arcsec off axis. Applicable to all coronagraph modes | |
CGI_Predicted_Performance_100offaxis_scattered_light | 3.5x10-10 | Scattered light flux ratio per resolution element from a source 100 arcsec off axis. Applicable to all coronagraph modes |
Name | Value | Unit | Description |
---|---|---|---|
CGI_Host_Star_Vmag_Requirement | =< 5 | AB mag | CGI host star requirement is V_AB mag<=5; CGI could potentially observe dimmer targets (V = 6-7 AB mag), but this is TBD |