Spectroscopy MultiAccum Tables

This article describes each of the Roman Wide Field Instrument (WFI) spectroscopy mode MultiAccum (MA) Tables.



The multi-accumulation tables (also called MultiAccum or MA Tables) define the sequence of detector reads that are taken during a WFI exposure. Additional details about these tables can be found in WFI MultiAccum Tables article. For guidance on how the choice of MultiAccum Table influences sensitivity, saturation, and exposure-time trade-offs in Roman WFI observations, see Understanding Roman WFI Sensitivity, Saturation, and Exposure Time.

The MA tables below are specific to the WFI spectroscopic mode. For each table, the following is provided:

  • a general summary table,
  • a figure of the table's ramp, and 
  • a table listing the properties of each resultant.

The MA tables for the imaging mode can be found in the Imaging MultiAccum Tables article. MA tables for engineering modes (which are restricted for nearly all users) can be found in the Engineering MultiAccum Tables article.


The MA tables described below correspond to "Rev G".

Table of Spectroscopy Mode MA Tables 

MA Table NameMA Table NumberNumber of ResultantsExposure Time (seconds)

SP_100_6

10345100
SP_150_910358150
SP_190_12103611190
SP_250_13103712250
SP_300_16103815300
SP_350_16103915350
SP_400_16104015400
SP_450_16104115450
SP_500_16104215500
SP_600_16104315600
SP_700_16104415700
SP_800_16104515800
SP_900_16104615900
SP_1000_161047151000




SP_100_6 

Table of SP_100_6 (General Properties)

Maximum Resultants5
Minimum Recommended Resultants5
WFI Observing ModeSpectroscopy
Science Read Time5.14116 seconds
Number of Reset Reads1
Reset Read Time5.14117 seconds
Subtract Reference ReadTrue
Reference Read Time5.14116 seconds
MA Table Number1034
MA Table IDSCI1034
MA Table DescriptionSpectroscopy, ~100 seconds, 5 resultants

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

Figure of SP_100_6

This figure shows a plot of MA Table 1034, SP_100_6.

Table of SP_100_6 (Resultants)

Resultant NumberNumber of SkipsNumber of Science ReadsResultant Duration (s)Integration Duration (s)Accumulated Exposure Time (s)Effective Exposure Time (s)
1015.1411610.282335.141165.14116
2015.1411615.4234910.2823210.28232
301051.4115966.8350761.693938.55869
40630.8469597.6820292.5408579.68796
5015.14116102.8231897.6820197.68201

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.


SP_150_9 

Table of SP_150_9 (General Properties)

Maximum Resultants8
Minimum Recommended Resultants8
WFI Observing ModeSpectroscopy
Science Read Time5.14116 seconds
Number of Reset Reads1
Reset Read Time5.14117 seconds
Subtract Reference ReadTrue
Reference Read Time5.14116 seconds
MA Table Number1035
MA Table IDSCI1035
MA Table DescriptionSpectroscopy, ~150 seconds, 8 resultants

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

Figure of SP_150_9

This figure shows a plot of MA Table 1035, SP_150_9.

Table of SP_150_9 (Resultants)

Resultant NumberNumber of SkipsNumber of Science ReadsResultant Duration (s)Integration Duration (s)Accumulated Exposure Time (s)Effective Exposure Time (s)
1015.1411610.282335.141165.14116
2015.1411615.4234910.2823210.28232
30210.2823225.705820.5646317.99405
40841.1292766.8350761.693943.69985
501051.41159118.24666113.1054989.97027
60420.56463138.81129133.67012125.95838
70210.28232149.09361143.95244141.38186
8015.14116154.23477149.0936149.0936

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.


SP_190_12 

Table of SP_190_12 (General Properties)

Maximum Resultants11
Minimum Recommended Resultants11
WFI Observing ModeSpectroscopy
Science Read Time5.14116 seconds
Number of Reset Reads1
Reset Read Time5.14117 seconds
Subtract Reference ReadTrue
Reference Read Time5.14116 seconds
MA Table Number1036
MA Table IDSCI1036
MA Table DescriptionSpectroscopy, ~190 seconds, 11 resultants

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

Figure of SP_190_12

This figure shows a plot of MA Table 1036, SP_190_12.


Table of SP_190_12 (Resultants)

Resultant NumberNumber of SkipsNumber of Science ReadsResultant Duration (s)Integration Duration (s)Accumulated Exposure Time (s)Effective Exposure Time (s)
1015.1411610.282335.141165.14116
2015.1411615.4234910.2823210.28232
30210.2823225.705820.5646317.99405
40420.5646346.2704441.1292733.41753
50420.5646366.8350761.693953.98216
60630.8469597.6820292.5408579.68796
70630.84695128.52897123.38781110.53491
80630.84695159.37593154.23476141.38186
90420.56463179.94056174.79939167.08765
100210.28232190.22288185.08171182.51113
11015.14116195.36404190.22287190.22287

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

SP_250_13 

Table of SP_250_13 (General Properties)

Maximum Resultants12
Minimum Recommended Resultants12
WFI Observing ModeSpectroscopy
Science Read Time5.14116 seconds
Number of Reset Reads1
Reset Read Time5.14117 seconds
Subtract Reference ReadTrue
Reference Read Time5.14116 seconds
MA Table Number1037
MA Table IDSCI1037
MA Table DescriptionSpectroscopy, ~250 seconds, 12 resultants

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

Figure of SP_250_13

This figure shows a plot of MA Table 1037, SP_250_13.

Table of SP_250_13 (Resultants)

Resultant NumberNumber of SkipsNumber of Science ReadsResultant Duration (s)Integration Duration (s)Accumulated Exposure Time (s)Effective Exposure Time (s)
1015.1411610.282335.141165.14116
2015.1411615.4234910.2823210.28232
30210.2823225.705820.5646317.99405
40210.2823235.9881230.8469528.27637
50420.5646356.5527551.4115943.69985
60841.1292797.6820292.5408574.5468
70841.12927138.81129133.67012115.67607
80841.12927179.94056174.79939156.80534
90841.12927221.06983215.92866197.9346
100420.56463241.63446236.49329228.78156
110210.28232251.91678246.77561244.20503
12015.14116257.05794251.91677251.91677

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

SP_300_16 

Table of SP_300_16 (General Properties)

Maximum Resultants15
Minimum Recommended Resultants15
WFI Observing ModeSpectroscopy
Science Read Time5.14116 seconds
Number of Reset Reads1
Reset Read Time5.14117 seconds
Subtract Reference ReadTrue
Reference Read Time5.14116 seconds
MA Table Number1038
MA Table IDSCI1038
MA Table DescriptionSpectroscopy, ~300 seconds, 15 resultants

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

Figure of SP_300_16

This figure shows a plot of MA Table 1038, SP_300_16.

Table of SP_300_16 (Resultants)

Resultant NumberNumber of SkipsNumber of Science ReadsResultant Duration (s)Integration Duration (s)Accumulated Exposure Time (s)Effective Exposure Time (s)
1015.1411610.282335.141165.14116
2015.1411615.4234910.2823210.28232
30210.2823225.705820.5646317.99405
40210.2823235.9881230.8469528.27637
50315.4234851.411646.2704341.12927
60630.8469582.2585577.1173864.26448
70630.84695113.1055107.9643395.11143
80630.84695143.95245138.81128125.95838
90630.84695174.7994169.65823156.80534
100630.84695205.64635200.50518187.65229
110630.84695236.4933231.35214218.49924
120630.84695267.34026262.19909249.34619
130420.56463287.90489282.76372275.05198
140210.28232298.18721293.04604290.47546
15015.14116303.32837298.1872298.1872

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.


SP_350_16 

Table of SP_350_16 (General Properties)

Maximum Resultants15
Minimum Recommended Resultants15
WFI Observing ModeSpectroscopy
Science Read Time5.14116 seconds
Number of Reset Reads1
Reset Read Time5.14117 seconds
Subtract Reference ReadTrue
Reference Read Time5.14116 seconds
MA Table Number1039
MA Table IDSCI1039
MA Table DescriptionSpectroscopy, ~350 seconds, 15 resultants

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

Figure of SP_350_16

This figure shows a plot of MA Table 1039, SP_350_16.

Table of SP_350_16 (Resultants)

Resultant NumberNumber of SkipsNumber of Science ReadsResultant Duration (s)Integration Duration (s)Accumulated Exposure Time (s)Effective Exposure Time (s)
1015.1411610.282335.141165.14116
2015.1411615.4234910.2823210.28232
30210.2823225.705820.5646317.99405
40210.2823235.9881230.8469528.27637
50420.5646356.5527551.4115943.69985
60525.7057982.2585577.1173866.83506
70630.84695113.1055107.9643395.11143
80841.12927154.23477149.0936131.09954
90841.12927195.36404190.22287172.22881
100841.12927236.4933231.35214213.35808
110841.12927277.62257272.4814254.48735
120841.12927318.75184313.61067295.61662
130420.56463339.31648334.17531326.46357
140210.28232349.59879344.45762341.88704
15015.14116354.73995349.59878349.59878

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

SP_400_16 

Table of SP_400_16 (General Properties)

Maximum Resultants15
Minimum Recommended Resultants15
WFI Observing ModeSpectroscopy
Science Read Time5.14116 seconds
Number of Reset Reads1
Reset Read Time5.14117 seconds
Subtract Reference ReadTrue
Reference Read Time5.14116 seconds
MA Table Number1040
MA Table IDSCI1040
MA Table DescriptionSpectroscopy, ~400 seconds, 15 resultants

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

Figure of SP_400_16

This figure shows a plot of MA Table 1040, SP_400_16.

Table of SP_400_16 (Resultants)

Resultant NumberNumber of SkipsNumber of Science ReadsResultant Duration (s)Integration Duration (s)Accumulated Exposure Time (s)Effective Exposure Time (s)
1015.1411610.282335.141165.14116
2015.1411615.4234910.2823210.28232
30210.2823225.705820.5646317.99405
40210.2823235.9881230.8469528.27637
50315.4234851.411646.2704341.12927
60420.5646371.9762366.8350659.12332
70841.12927113.1055107.9643389.97027
801051.41159164.51708159.37592136.2407
901261.6939226.21099221.06982192.79345
1001051.41159277.62257272.4814249.34619
1101051.41159329.03416323.89299300.75778
120841.12927370.16343365.02226347.0282
130420.56463390.72806385.58689377.87515
140210.28232401.01038395.86921393.29863
15015.14116406.15154401.01037401.01037

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

SP_450_16 

Table of SP_450_16 (General Properties)

Maximum Resultants15
Minimum Recommended Resultants15
WFI Observing ModeSpectroscopy
Science Read Time5.14116 seconds
Number of Reset Reads1
Reset Read Time5.14117 seconds
Subtract Reference ReadTrue
Reference Read Time5.14116 seconds
MA Table Number1041
MA Table IDSCI1041
MA Table DescriptionSpectroscopy, ~450 seconds, 15 resultants

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

Figure of SP_450_16

This figure shows a plot of MA Table 1041, SP_450_16.

Table of SP_450_16 (Resultants)

Resultant NumberNumber of SkipsNumber of Science ReadsResultant Duration (s)Integration Duration (s)Accumulated Exposure Time (s)Effective Exposure Time (s)
1015.1411610.282335.141165.14116
2015.1411615.4234910.2823210.28232
30210.2823225.705820.5646317.99405
40210.2823235.9881230.8469528.27637
50420.5646356.5527551.4115943.69985
60735.9881192.5408687.399771.97622
701051.41159143.95245138.81128115.67607
801261.6939205.64635200.50518172.22881
901261.6939267.34026262.19909233.92271
1001261.6939329.03416323.89299295.61662
1101051.41159380.44574375.30458352.16936
120841.12927421.57501416.43384398.43979
130420.56463442.13965436.99848429.28674
140210.28232452.42196447.2808444.71022
15015.14116457.56312452.42195452.42195

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

SP_500_16 

Table of SP_500_16 (General Properties)

Maximum Resultants15
Minimum Recommended Resultants15
WFI Observing ModeSpectroscopy
Science Read Time5.14116 seconds
Number of Reset Reads1
Reset Read Time5.14117 seconds
Subtract Reference ReadTrue
Reference Read Time5.14116 seconds
MA Table Number1042
MA Table IDSCI1042
MA Table DescriptionSpectroscopy, ~500 seconds, 15 resultants

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

Figure of SP_500_16

This figure shows a plot of MA Table 1042, SP_500_16.

Table of SP_500_16 (Resultants)

Resultant NumberNumber of SkipsNumber of Science ReadsResultant Duration (s)Integration Duration (s)Accumulated Exposure Time (s)Effective Exposure Time (s)
1015.1411610.282335.141165.14116
2015.1411615.4234910.2823210.28232
30210.2823225.705820.5646317.99405
40210.2823235.9881230.8469528.27637
50420.5646356.5527551.4115943.69985
601051.41159107.96434102.8231779.68796
701261.6939169.65824164.51707136.2407
801261.6939231.35215226.21098197.9346
901261.6939293.04605287.90488259.62851
1001261.6939354.73995349.59878321.32241
1101261.6939416.43385411.29269383.01631
1201051.41159467.84544462.70427439.56906
130420.56463488.41007483.26891475.55717
140210.28232498.69239493.55122490.98064
15015.14116503.83355498.69238498.69238

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

SP_600_16 

Table of SP_600_16 (General Properties)

Maximum Resultants15
Minimum Recommended Resultants15
WFI Observing ModeSpectroscopy
Science Read Time5.14116 seconds
Number of Reset Reads1
Reset Read Time5.14117 seconds
Subtract Reference ReadTrue
Reference Read Time5.14116 seconds
MA Table Number1043
MA Table IDSCI1043
MA Table DescriptionSpectroscopy, ~600 seconds, 15 resultants

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

Figure of SP_600_16

This figure shows a plot of MA Table 1043, SP_600_16.

Table of SP_600_16 (Resultants)

Resultant NumberNumber of SkipsNumber of Science ReadsResultant Duration (s)Integration Duration (s)Accumulated Exposure Time (s)Effective Exposure Time (s)
1015.1411610.282335.141165.14116
2015.1411615.4234910.2823210.28232
30210.2823225.705820.5646317.99405
40420.5646346.2704441.1292733.41753
50841.1292787.3997182.2585464.26448
60946.27043133.67013128.52896107.96433
701261.6939195.36404190.22287161.94649
801682.25854277.62257272.4814233.92271
901682.25854359.88111354.73994316.18125
1001682.25854442.13965436.99848398.43979
1101682.25854524.39818519.25702480.69833
120946.27043570.66861565.52744544.96281
130420.56463591.23325586.09208578.38034
140210.28232601.51556596.37439593.80381
15015.14116606.65672601.51555601.51555

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.


SP_700_16 

Table of SP_700_16 (General Properties)

Maximum Resultants15
Minimum Recommended Resultants15
WFI Observing ModeSpectroscopy
Science Read Time5.14116 seconds
Number of Reset Reads1
Reset Read Time5.14117 seconds
Subtract Reference ReadTrue
Reference Read Time5.14116 seconds
MA Table Number1044
MA Table IDSCI1044
MA Table Description

Spectroscopy, ~700 seconds, 15 resultants

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

Figure of SP_700_16

This figure shows a plot of MA Table 1044, SP_700_16.

Table of SP_700_16 (Resultants)

Resultant NumberNumber of SkipsNumber of Science ReadsResultant Duration (s)Integration Duration (s)Accumulated Exposure Time (s)Effective Exposure Time (s)
1015.1411610.282335.141165.14116
2015.1411615.4234910.2823210.28232
30210.2823225.705820.5646317.99405
40420.5646346.2704441.1292733.41753
50841.1292787.3997182.2585464.26448
601156.55274143.95245138.81128113.10549
701261.6939205.64635200.50518172.22881
801682.25854287.90489282.76372244.20503
901682.25854370.16343365.02226326.46357
10032164.51707534.6805529.53933449.85137
1101682.25854616.93904611.79787573.23918
1201051.41159668.35062663.20946640.07424
130420.56463688.91526683.77409676.06235
140210.28232699.19758694.05641691.48583
15015.14116704.33873699.19757699.19757

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.


SP_800_16 

Table of SP_800_16 (General Properties)

Maximum Resultants15
Minimum Recommended Resultants15
WFI Observing ModeSpectroscopy
Science Read Time5.14116 seconds
Number of Reset Reads1
Reset Read Time5.14117 seconds
Subtract Reference ReadTrue
Reference Read Time5.14116 seconds
MA Table Number1045
MA Table IDSCI1045
MA Table DescriptionSpectroscopy, ~800 seconds, 15 resultants

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

Figure of SP_800_16

This figure shows a plot of MA Table 1045, SP_800_16.

Table of SP_800_16 (Resultants)

Resultant NumberNumber of SkipsNumber of Science ReadsResultant Duration (s)Integration Duration (s)Accumulated Exposure Time (s)Effective Exposure Time (s)
1015.1411610.282335.141165.14116
2015.1411615.4234910.2823210.28232
30210.2823225.705820.5646317.99405
40420.5646346.2704441.1292733.41753
501051.4115997.6820292.5408569.40564
601261.6939159.37593154.23476125.95838
701261.6939221.06983215.92866187.65229
801682.25854303.32837298.1872259.62851
9032164.51707467.84544462.70427383.01631
10032164.51707632.36251627.22135547.53339
1101682.25854714.62105709.47988670.92119
1201051.41159766.03264760.89147737.75625
130420.56463786.59727781.4561773.74436
140210.28232796.87959791.73842789.16784
15015.14116802.02075796.87958796.87958

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

SP_900_16 

Table of SP_900_16 (General Properties)

Maximum Resultants15
Minimum Recommended Resultants15
WFI Observing ModeSpectroscopy
Science Read Time5.14116 seconds
Number of Reset Reads1
Reset Read Time5.14117 seconds
Subtract Reference ReadTrue
Reference Read Time5.14116 seconds
MA Table Number1046
MA Table IDSCI1046
MA Table DescriptionSpectroscopy, ~900 seconds, 15 resultants

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

Figure of SP_900_16

This figure shows a plot of MA Table 1046, SP_900_16.


Table of SP_900_16 (Resultants)

Resultant NumberNumber of SkipsNumber of Science ReadsResultant Duration (s)Integration Duration (s)Accumulated Exposure Time (s)Effective Exposure Time (s)
1015.1411610.282335.141165.14116
2015.1411615.4234910.2823210.28232
30210.2823225.705820.5646317.99405
40420.5646346.2704441.1292733.41753
501051.4115997.6820292.5408569.40564
601261.6939159.37593154.23476125.95838
701682.25854241.63446236.49329197.9346
8032164.51707406.15154401.01037321.32241
9032164.51707570.66861565.52744485.83948
10032164.51707735.18569730.04452650.35656
1101682.25854817.44422812.30305773.74436
1201051.41159868.85581863.71464840.57943
130420.56463889.42044884.27927876.56754
140210.28232899.70276894.56159891.99101
15015.14116904.84392899.70275899.70275

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

SP_1000_16 

Table of SP_1000_16 (General Properties)

Maximum Resultants15
Minimum Recommended Resultants15
WFI Observing ModeSpectroscopy
Science Read Time5.14116 seconds
Number of Reset Reads1
Reset Read Time5.14117 seconds
Subtract Reference ReadTrue
Reference Read Time5.14116 seconds
MA Table Number1047
MA Table IDSCI1047
MA Table DescriptionSpectroscopy, ~1000 seconds, 15 resultants

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.

Figure of SP_1000_16

This figure shows a plot of MA Table 1047, SP_1000_16.

Table of SP_1000_16 (Resultants)

Resultant NumberNumber of SkipsNumber of Science ReadsResultant Duration (s)Integration Duration (s)Accumulated Exposure Time (s)Effective Exposure Time (s)
1015.1411610.282335.141165.14116
2015.1411615.4234910.2823210.28232
30210.2823225.705820.5646317.99405
40420.5646346.2704441.1292733.41753
501051.4115997.6820292.5408569.40564
601682.25854179.94056174.79939136.2407
7032164.51707344.45763339.31647259.62851
8032164.51707508.97471503.83354424.14558
9032164.51707673.49178668.35061588.66266
10032164.51707838.00886832.86769753.17973
1101682.25854920.26739915.12623876.56754
1201051.41159971.67898966.53781943.4026
130420.56463992.24361987.10245979.39071
140210.282321002.52593997.38476994.81418
15015.141161007.667091002.525921002.52592

Changes to the technical details and other specifications presented here are expected as a part of pre-launch development.




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