MIRI Guidelines for Updates

(Insert information on process and best practices for updating this page, will probably direct to JDOXCM or MIRI JIRA.)

Imager

Filter Properties

Description	Multi-Excerpt Variable	Multi-Excerpt Data	Locations of Value	Date Changed	Changed By
Wavelength Range	imawlrange	mu5.6 to 25.5 μm	MIRI Imaging
Detector plate scale	imadps	0.11 "/pixel	MIRI Imaging
Imaging F560W λ₀(μm)	560wl	5.6	MIRI Imaging, MIRI Filters and Dispersers
F770W λ₀	770wl	7.7	MIRI Imaging, MIRI Filters and Dispersers
F1000W λ₀	1000wl	10.0	MIRI Imaging, MIRI Filters and Dispersers
F1130W λ₀	1130wl	11.3	MIRI Imaging, MIRI Filters and Dispersers
F1280W λ₀	1280wl	12.8	MIRI Imaging, MIRI Filters and Dispersers
F1500W λ₀	1500wl	15.0	MIRI Imaging, MIRI Filters and Dispersers
F1800W λ₀	1800wl	18.0	MIRI Imaging, MIRI Filters and Dispersers
F2100W λ₀	2100wl	21.0	MIRI Imaging, MIRI Filters and Dispersers
F2550W λ₀	2550wl	25.5	MIRI Imaging, MIRI Filters and Dispersers
FND λ₀	FNDwl	~13	MIRI Imaging, MIRI Filters and Dispersers
Imaging F560W Δλ (μm)	560delta	1.00	MIRI Imaging, MIRI Filters and Dispersers	7 Jun 2023	Karl Gordon - updated to explicit definition of bandwidth
F770W Δλ	770delta	1.95	MIRI Imaging, MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1000W Δλ	1000delta	1.80	MIRI Imaging, MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1130W Δλ	1130delta	0.73	MIRI Imaging, MIRI Filters and Dispersers	7 Jun 2023	Karl Gordon - updated to explicit definition of bandwidth
F1280W Δλ	1280delta	2.47	MIRI Imaging, MIRI Filters and Dispersers	7 Jun 2023	Karl Gordon - updated to explicit definition of bandwidth
F1500W Δλ	1500delta	2.92	MIRI Imaging, MIRI Filters and Dispersers	7 Jun 2023	Karl Gordon - updated to explicit definition of bandwidth
F1800W Δλ	1800delta	2.95	MIRI Imaging, MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F2100W Δλ	2100delta	4.58	MIRI Imaging, MIRI Filters and Dispersers	7 Jun 2023	Karl Gordon - updated to explicit definition of bandwidth
F2550W Δλ	2550delta	3.67	MIRI Imaging, MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
FND Δλ	FNDdelta	6.73	MIRI Imaging, MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
Imaging F560W FWHM (arcsec)	560fwhm	0.269	MIRI Imaging, MIRI Filters and Dispersers, MIRI PSFs	17 June 2026	Alberts - updated based on Gordon et al. 2025
F770W FWHM	770fwhm	0.301	MIRI Imaging, MIRI Filters and Dispersers	17 June 2026	Alberts - updated based on Gordon et al. 2025
F1000W FWHM	1000fwhm	0.356	MIRI Imaging, MIRI Filters and Dispersers	17 June 2026	Alberts - updated based on Gordon et al. 2025
F1130W FWHM	1130fwhm	0.390	MIRI Imaging, MIRI Filters and Dispersers	17 June 2026	Alberts - updated based on Gordon et al. 2025
F1280W FWHM	1280fwhm	0.430	MIRI Imaging, MIRI Filters and Dispersers	17 June 2026	Alberts - updated based on Gordon et al. 2025
F1500W FWHM	1500fwhm	0.506	MIRI Imaging, MIRI Filters and Dispersers	17 June 2026	Alberts - updated based on Gordon et al. 2025
F1800W FWHM	1800fwhm	0.595	MIRI Imaging, MIRI Filters and Dispersers	17 June 2026	Alberts - updated based on Gordon et al. 2025
F2100W FWHM	2100fwhm	0.685	MIRI Imaging, MIRI Filters and Dispersers	17 June 2026	Alberts - updated based on Gordon et al. 2025
F2550W FWHM	2550fwhm	0.830	MIRI Imaging, MIRI Filters and Dispersers	17 June 2026	Alberts - updated based on Gordon et al. 2025
F560W pivot λ	560pivotwl	5.635	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F770W pivot λ	770pivotwl	7.639	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1000W pivot λ	1000pivotwl	9.953	MIRI Filters and Dispersers
F1130W pivot λ	1130pivotwl	11.309	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1280W pivot λ	1280pivotwl	12.810	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1500W pivot λ	1500pivotwl	15.064	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1800W pivot λ	1800pivotwl	17.984	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F2100W pivot λ	2100pivotwl	20.795	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F2550W pivot λ	2550pivotwl	25.365	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
FND pivot λ	FNDpivotwl	12.900	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F560W eff response	560effresp	0.245	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F770W eff response	770effresp	0.355	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1000W eff response	1000effresp	0.466	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1130W eff response	560effresp	0.412	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1280W eff response	1280effresp	0.384	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1500W eff response	1500effresp	0.442	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1800W eff response	1800effresp	0.447	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F2100W eff response	2100effresp	0.352	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F2550W eff response	2550effresp	0.269	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
FND eff response	FNDeffresp	0.000764	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F560W blue wave	560bwave	5.054	MIRI Filters and Dispersers
F770W blue wave	770bwave	6.581	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1000W blue wave	1000bwave	9.023	MIRI Filters and Dispersers
F1130W blue wave	1130bwave	10.953	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1280W blue wave	1280bwave	11.588	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1500W blue wave	1500bwave	13.527	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1800W blue wave	1800bwave	16.519	MIRI Filters and Dispersers
F2100W blue wave	2100bwave	18.477	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F2550W blue wave	2550bwave	23.301	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
FND blue wave	FNDbwave	8.456	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F560W red wave	560rwave	6.171	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F770W red wave	770rwave	8.687	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1000W red wave	1000rwave	10.891	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1130W red wave	1130rwave	11.667	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1280W red wave	1280rwave	14.115	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1500W red wave	1500rwave	16.640	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F1800W red wave	1800rwave	19.502	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F2100W red wave	2100rwave	23.159	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
F2550W red wave	2550rwave	26.733	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl
FND red wave	FNDrwave	15.473	MIRI Filters and Dispersers	25 Sep 2023	Libralato updated upon revision from Karl

Coronagraph

Filter Properties

Description

Multi-Excerpt Variable

Multi-Excerpt Data

Locations of Value

Date Changed

Changed By

Date Expected to Change

Wavelength Range

coronwlrange

10 to 23 μm

MIRI Coronagraphic Imaging

Coronagraph filter properties

miri-filt-coron

Filter	Coronagraph	Pupil mask transmission (%)^*	Central wavelength (μm)	Bandwidth^† (μm)	IWA^‡ (arcsec)	Rejection^§ (on-axis)
F1065C^**	4QPM1	62	10.575	0.75	0.33	260
F1140C	4QPM2	62	11.30	0.8	0.36	285
F1550C	4QPM3	62	15.50	0.9	0.49	310
F2300C	Lyot spot^††	72	22.75	5.5	200000	850

^* Coronagraph filters are paired with pupil masks to reduce diffracted light from both the telescope pupil and the coronagraph, but at the expense of some loss of total intensity.

^† Bandwidth is defined to extend to wavelengths on either side of the central wavelength that correspond to 5%–10% of the transmission efficiency.

^‡Inner working angle (IWA) is defined as the 50% transmission radius.

^§ Rejection is the total flux attenuation of a star when centered onto the coronagraph. The term is unitless since it is a ratio of two intensities (out of mask / on the mask).

^** Band pass useful for NH₃ and silicates.

^†† The "spot" refers to the circular occulting mask in the Lyot-type coronagraph.

MIRI Coronagraphic Imaging, MIRI Filters and Dispersers

Lyot Spot Mask Radius

Lyotspmaskr

2.16"

MIRI Coronagraphic Imaging

Lyot Occulting Spot

LyotOccSpot

3.3 λ/D

MIRI Coronagraphs, MIRI Coronagraphic Imaging Target Acquisition

Lyot Occulting Spot Wavelength

LyotOccSpotWVL

23 µm

MIRI Coronagraphs

LRS

Filter Properties

Description	Multi-Excerpt Variable	Multi-Excerpt Data	Locations of Value
Wavelength Range Reminder - check every page, talk to Sarah about MIRI Detector Subarrays LRS wl range value	lrswlrange	5 to 14 μm	MIRI Low Resolution Spectroscopy, MIRI Detector Subarrays
Spectral Resolving Power	LRSsrp7.5	~100 at 7.5 µm
	LRSsrp5	~40 at 5 μm
	LRSsrp10	~160 at 10 μm
Slit TA Subpixel Accuracy	SlitTAsubpixacc	< 10 mas	MIRI LRS Slit Target Acquisition
Slit TA distance between target and TA target	slitTAdist	60"	MIRI LRS Slit Target Acquisition
Slit Recommended SNR for TA	LRSTASNR	> 20	MIRI LRS Slit Target Acquisition
Slitless TA Subpixel Accuracy	Slitlesssubpixacc	< 10 mas	MIRI LRS Slitless Target Acquisition
Slitless TA distance between target and TA target	slitlessTAdist	60"	MIRI LRS Slitless Target Acquisition

Wide Field Slitless Spectroscopy Mode

Description	Multi-Excerpt Variable	Multi-Excerpt Data	Locations of Value
Wavelength Range	wfss-range	5 to 14 μm	JWST Mid Infrared Instrument, MIRI Observing Modes
Field of View	wfss-fov	74 × 113	JWST Mid Infrared Instrument, MIRI Observing Modes
Pixel Scale	wfss-pixelscale	0.11	JWST Mid Infrared Instrument, MIRI Observing Modes
Resolving Power	wfss-resolvepwr	~100 at 7.5 μm	JWST Mid Infrared Instrument, MIRI Observing Modes
FWHM	wfss-fwhm	2.6 pix at 7.7 μm	JWST Mid Infrared Instrument, MIRI Observing Modes

MRS

Filter Properties

Description

Multi-Excerpt Variable

Multi-Excerpt Data

Locations of Value

Date Changed

Changed By

Date Expected to Change

MRS Full Wavelength Range

mrswlrange

4.9 to 27.9 μm

4.9 and 27.9 μm

MIRI Medium Resolution Spectroscopy, MIRI Optics and Focal Plane, MIRI Filters and Dispersers, MIRI Spectroscopic Elements

MRS Filter Properties

MRSChannels

FOV name λ-range (μm)	FOV (arcsec)	Number of slices	Slice width (arcsec)	Average detector pixel size (arcsec)	Default cube spaxel size (arcsec)	Sub-band name	λ-range (μm)	Resolving power (λ/Δλ)
Channel 1 4.9–7.65	3.2 × 3.7	21	0.176	0.196	0.13	SHORT (A) MEDIUM (B) LONG (C)	4.90–5.74 5.66–6.63 6.53–7.65	3,320–3,710 3,190–3,750 3,100–3,610
Channel 2 7.51–11.7	4.0 × 4.8	17	0.277	0.196	0.17	SHORT (A) MEDIUM (B) LONG (C)	7.51–8.77 8.67–10.13 10.01–11.70	2,990–3,110 2,750–3,170 2,860–3,300
Channel 3 11.55–17.98	5.2 × 6.2	16	0.387	0.245	0.20	SHORT (A) MEDIUM (B) LONG (C)	11.55–13.47 13.34–15.57 15.41–17.98	2,530–2,880 1,790–2,640 1,980–2,790
Channel 4 17.7–27.9	6.6 × 7.7	12	0.645	0.273	0.35	SHORT (A) MEDIUM (B) LONG (C)	17.70–20.95 20.69–24.48 24.40–27.90	1,460–1,930 1,680–1,770 1,630–1,330

MIRI Medium Resolution Spectroscopy, MIRI Filters and Dispersers

7/15/24

1/07/26

Kate Rowlands - Updated MRS CH4C and CH2C wavelength limits to match cubepar reference file

David Law- Added default spaxel scales

TA Improvement to pointing precision

mrstapointpres

90 mas

MIRI MRS Target Acquisition

FND 300 K Hard Saturation

fnd300sat

4.7

MIRI MRS Target Acquisition

FND 1000 K Hard Saturation

fnd1000sat

5.5

MIRI MRS Target Acquisition

MRS TA distance between target and TA target

MRSTAdist

16"

MIRI MRS Target Acquisition

MRS Spacecraft Movement limit for TA

MRSTAlimit

40''

MIRI MRS Target Acquisition

MRS Channel 1 Wavelength Range

MRSCh1WR

4.9–7.65

MRS Channel 2 WR

MRSCh2WR

7.51–11.7

MRS Channel 3 WR

MRSCh3WR

11.55–17.98

MRS Channel 4 WR

MRSCh4WR

17.7–27.9

MRS Channel 1 Field of View

MRSCh1FOV

3.2'' × 3.7''

MRS Channel 2 Field of View

MRSCh2FOV

4.0 × 4.8

MRS Channel 3 Field of View

MRSCh3FOV

5.2 × 6.2

MRS Channel 4 Field of View

MRSCh4FOV

6.6'' × 7.7''

MRS Channel 1 Slice Width (arcsec)

MRSCh1SW

0.176

MRS Channel 2 Slice Width

MRSCh2SW

0.277

MRS Channel 3 Slice Width

MRSCh3SW

0.387

MRS Channel 4 Slice Width

MRSCh4SW

0.645

MRS Channel 1 Pixel Size (arcsec)

MRSCh1PS

0.196

MRS Channel 2 Pixel Size

MRSCh2PS

0.196

MRS Channel 3 Pixel Size

MRSCh3PS

0.245

MRS Channel 4 PixelSize

MRSCh4PS

0.273

MRS Channel 1 Subchannel Short(A) Wavelength Range

MRSCh1AWR

4.90–5.74

MRS Channel 1 Subchannel Medium(B) WR

MRSCh1BWR

5.66–6.63

MRS Channel 1 Subchannel Long(C) WR

MRSCh1CWR

6.53–7.65

MRS Channel 2 Subchannel Short(A) WR

MRSCh2AWR

7.51–8.77

MRS Channel 2 Subchannel Medium(B) WR

MRSCh2BWR

8.67–10.13

MRS Channel 2 Subchannel Long(C) WR

MRSCh2CWR

10.01–11.70

7/15/24

Kate Rowlands - Updated MRS CH4C and CH2C wavelength limits to match cubepar reference file

MRS Channel 3 Subchannel Short(A) WR

MRSCh3AWR

11.55–13.47

MRS Channel 3 Subchannel Medium(B) WR

MRSCh3BWR

13.34–15.57

MRS Channel 3 Subchannel Long(C) WR

MRSCh3CWR

15.41–17.98

MRS Channel 4 Subchannel Short(A) WR

MRSCh4AWR

17.70–20.96

MRS Channel 4 Subchannel Medium(B) WR

MRSCh4BWR

20.69–24.48

MRS Channel 4 Subchannel Long(C) WR

MRSCh4CWR

24.40–27.90

7/15/24

Kate Rowlands - Updated MRS CH4C and CH2C wavelength limits to match cubepar reference file

MRS Channel 1 Subchannel Short(A) Resolving Power

MRSCh1ARP

3,320–3,710

MRS Channel 1 Subchannel Medium(B) RP

MRSCh1BRP

3,190–3,750

MRS Channel 1 Subchannel Long(C) RP

MRSCh1CRP

3,100–3,610

MRS Channel 2 Subchannel Short(A) RP

MRSCh2ARP

2,990–3,110

MRS Channel 2 Subchannel Medium(B) RP

MRSCh2BRP

2,750–3,170

MRS Channel 2 Subchannel Long(C) RP

MRSCh2CRP

2,860–3,300

MRS Channel 3 Subchannel Short(A) RP

MRSCh3ARP

2,530–2,880

MRS Channel 3 Subchannel Medium(B) RP

MRSCh3BRP

1,790–2,640

MRS Channel 3 Subchannel Long(C) RP

MRSCh3CRP

1,980–2,790

MRS Channel 4 Subchannel Short(A) RP

MRSCh4ARP

1,460–1,930

MRS Channel 4 Subchannel Medium(B) RP

MRSCh4BRP

1,680–1,770

MRS Channel 4 Subchannel Long(C) RP

MRSCh4CRP

1,630–1,330

Subarrays

Coronography Subarrays

Description

Multi-Excerpt Variable

Multi-Excerpt Data

Locations of Value

Date Changed

Changed By

Date Expected to Change

Coronagraph Subarray Details

coronsubdetails

Subarray	Filter	Size in pixels (rows × columns)	First row corner	First column corner	Size*	Frame time^†
MASK1065	F1065C	224 × 288	21	1	24" × 24"	0.240 s
MASK1140	F1140C	224 × 288	243	1	24" × 24"	0.240 s
MASK1550	F1550C	224 × 288	463	1	24" × 24"	0.240 s
MASKLYOT	F2300C	304 × 320	719	1	30" × 30"	0.324 s

FULL Subarray Details

Description	Multi-Excerpt Variable	Multi-Excerpt Data	Locations of Value
(Imager) Full Subarray Size in Pixels	fullarraysubsize	1024 × 1032	MIRI Detector Subarrays, MIRI Imaging
Full Subarray first row corner	fullarrayfirstrow	1	MIRI Detector Subarrays
Full Subarray first column corner	fullarrayfirstcol	1	MIRI Detector Subarrays
Full Subarray Usable size	fullarrayusesize	74" × 113"	MIRI Detector Subarrays, MIRI Imaging
Full Subarray Frame Time	fullframetime	2.775 s	MIRI Detector Subarrays, MIRI Imaging, MIRI LRS Slitless Target Acquisition

BRIGHTSKY Subarray Details

Description	Multi-Excerpt Variable	Multi-Excerpt Data	Locations of Value
BRIGHTSKY Subarray Size in Pixels	brightarraysize	512 × 512	MIRI Detector Subarrays, MIRI Imaging
BRIGHTSKY Subarray first row corner	brightarrayfirstrow	51	MIRI Detector Subarrays
BRIGHTSKY Subarray first column corner	brightarrayfirstcol	457	MIRI Detector Subarrays
BRIGHTSKY Subarray Usable size	brightarrayusesize	56.3" × 56.3"	MIRI Detector Subarrays, MIRI Imaging
BRIGHTSKY Subarray Frame Time	brightframetime	0.865 s	MIRI Detector Subarrays, MIRI Imaging

SUB256 Subarray Details

Description	Multi-Excerpt Variable	Multi-Excerpt Data	Locations of Value
SUB256 Size in Pixels	SUB256size	256 × 256	MIRI Detector Subarrays, MIRI Imaging
SUB256 Subarray first row corner	SUB256firstrow	51	MIRI Detector Subarrays
SUB256 Subarray first column corner	SUB256firstcol	413	MIRI Detector Subarrays
SUB256 Subarray Usable size	SUB256usesize	28.2" × 28.2"	MIRI Detector Subarrays, MIRI Imaging
SUB256 Subarray Frame Time	SUB256frametime	0.300 s	MIRI Detector Subarrays, MIRI Imaging

SUB128 Subarray Details

Description	Multi-Excerpt Variable	Multi-Excerpt Data	Locations of Value
SUB128 Size in Pixels	SUB128size	128 × 136	MIRI Detector Subarrays, MIRI Imaging
SUB128 Subarray first row corner	SUB128firstrow	891	MIRI Detector Subarrays
SUB128 Subarray first column corner	SUB128firstcol	1	MIRI Detector Subarrays
SUB128 Subarray Usable size	SUB128usesize	14.1" × 14.1"	MIRI Detector Subarrays, MIRI Imaging
SUB128 Subarray Frame Time	SUB128frametime	0.119 s	MIRI Detector Subarrays, MIRI Imaging

SUB128_IP Subarray Details

Description	Multi-Excerpt Variable	Multi-Excerpt Data	Locations of Value
SUB128_IP Size in Pixels	SUB128_IPsize	128 × 132	MIRI Detector Subarrays, MIRI Imaging
SUB128_IP Subarray first row corner	SUB128_IPfirstrow	889	MIRI Detector Subarrays
SUB128_IP Subarray first column corner	SUB128_IPfirstcol	13	MIRI Detector Subarrays
SUB128_IP Subarray Usable size	SUB128_IPusesize	14.1" × 14.1"	MIRI Detector Subarrays, MIRI Imaging
SUB128_IP Subarray Frame Time	SUB128_IPframetime	0.120 s	MIRI Detector Subarrays, MIRI Imaging

SUB64 Subarray Details

Description	Multi-Excerpt Variable	Multi-Excerpt Data	Locations of Value
SUB64 Size in Pixels	SUB64size	64 × 72	MIRI Detector Subarrays, MIRI Imaging
SUB64 Subarray first row corner	SUB64firstrow	779	MIRI Detector Subarrays
SUB64 Subarray first column corner	SUB64firstcol	1	MIRI Detector Subarrays
SUB64 Subarray Usable size	SUB64usesize	7" × 7"	MIRI Detector Subarrays, MIRI Imaging
SUB64 Subarray Frame Time	SUB64frametime	0.085 s	MIRI Detector Subarrays, MIRI Imaging

SUB64_IP Subarray Details

Description	Multi-Excerpt Variable	Multi-Excerpt Data	Locations of Value
SUB64_IP Size in Pixels	SUB64_IPsize	64 × 76	MIRI Detector Subarrays, MIRI Imaging
SUB64_IP Subarray first row corner	SUB64_IPfirstrow	779	MIRI Detector Subarrays
SUB64_IP Subarray first column corner	SUB64_IPfirstcol	13	MIRI Detector Subarrays
SUB64_IP Subarray Usable size	SUB64_IPusesize	7" × 7"	MIRI Detector Subarrays, MIRI Imaging
SUB64_IP Subarray Frame Time	SUB64_IPframetime	0.087 s	MIRI Detector Subarrays, MIRI Imaging

SLITLESSPRISM Subarray Details

Description	Multi-Excerpt Variable	Multi-Excerpt Data	Locations of Value
Slitless Prism Subarray Size in Pixels	slitlessarraysize	416 × 72	MIRI Detector Subarrays
Slitless Prism Subarray first row corner	slitlessarrayfirstrow	529	MIRI Detector Subarrays
Slitless Prism Subarray first column corner	slitlessarrayfirstcol	1	MIRI Detector Subarrays
Slitless Prism Subarray Frame Time	slitlessframetime	0.159 s	MIRI Detector Subarrays, MIRI LRS Slitless Target Acquisition

Sensitivities and Bright Source Limits

Description

Multi-Excerpt Variable

Multi-Excerpt Data

Locations of Value

Date Changed

Changed By

Date Expected to Change

Imager Sensitivity Table

MIRIImaSensitivity

Filter	Low Background Detection Limit (μJy)
F560W	0.14
F770W	0.25
F1000W	0.47
F1130W	1.05
F1280W	0.85
F1500W	1.21
F1800W	2.46
F2100W	4.78
F2550W	15.6

MIRI Sensitivity

Imager Full Array Bright Source Limits

ImaFullBSL

Filter	FULL Frame (mJy)	SUB64 subarray (mJy)
*F560W*	3.95	129
*F770W*	3.23	106
*F1000W*	5.83	192
*F1130W*	22.3	731
*F1280W*	11.1	367
*F1500W*	12.7	416
*F1800W*	21.7	753
*F2100W*	25.4	975
*F2550W*	57.6	2686

MIRI Bright Source Limits

Imager Subarray Bright Source Limits

ImaSubBSL

Subarray	Brightness limit in F560W (mJy)	Brightness limit in F2550W (mJy)
*FULL*	3.95	57.6
*BRIGHTSKY*	12.7	241
*SUB256*	36.6	745
*SUB128*	92.2	1913
*SUB64*	129	2686

MIRI Bright Source Limits

Detector Properties

Description

Multi-Excerpt Variable

Multi-Excerpt Data

Locations of Value

Date Changed

Changed By

Date Expected to Change

Fast Readout Frame Time

fastt1

2.775 s

MIRI Detector Readout Overview, MIRI Detector Readout FASTR1, MIRI Detector Subarrays, MIRI LRS Slitless Target Acquisition, MIRI Cross-Mode Recommended Strategies

Fast number of samples per pixel per frame

fastNsam

1

MIRI Detector Readout Overview, MIRI Detector Readout FASTR1

Slow Readout Frame Time

slowt1

23.890 s

MIRI Detector Readout Overview, MIRI Detector Readout SLOWR1, MIRI Cross-Mode Recommended Strategies

Slow number of samples per pixel per frame

slowNsam

9

MIRI Detector Readout Overview, MIRI Detector Readout SLOWR1

MRS pre-flight pointing origins last time determined

MRSpfpdate

November 2019

MIRI MRS Field and Coordinates

MRS Pre-flight Pointing Origins

MRSpointing

Channel	V2 pointing origin value (arcsec)	V3 pointing origin value (arcsec)
1/ALL	-503.654	-318.742
2	-503.636	-319.091
3	-504.372	-318.798
4	-503.129	-319.488

MIRI MRS Field and Coordinates

FASTGRPAVG detector readout capability

fgacap

Readout mode (as offered in APT)	#averaged MIRI frames	Group time (FULL array)	Group time (Slitlessprism subarray)	Group Time (MaskLyot subarray)	Group Time (4QPM subarrays)
FASTGRPAVG	4	11.10 s	0.64 s	1.30 s	0.96 s
FASTGRPAVG8	8	22.20 s	1.27 s	2.59 s	1.92 s
FASTGRPAVG16	16	44.40 s	2.54 s	5.18 s	3.84 s
FASTGRPAVG32	32	88.80 s	5.09 s	10.37 s	7.67 s
FASTGRPAVG64	64	177.60 s	10.18 s	20.74 s	15.34 s

MIRI Target Acquisition

Notable updates
Originally published	24 Jun 2021

JWST User Documentation

MIRI Numerical Repository Data

MIRI Guidelines for Updates

Imager

Filter Properties

Coronagraph

Filter Properties

LRS

Filter Properties

Wide Field Slitless Spectroscopy Mode

MRS

Filter Properties

Subarrays

Coronography Subarrays

FULL Subarray Details

BRIGHTSKY Subarray Details

SUB256 Subarray Details

SUB128 Subarray Details

SUB128_IP Subarray Details

SUB64 Subarray Details

SUB64_IP Subarray Details

SLITLESSPRISM Subarray Details

Sensitivities and Bright Source Limits

Detector Properties