spacetelescope · jemorrison · Nov 30, 2021 · Dec 16, 2020 · Nov 29, 2021 · Nov 29, 2021
diff --git a/CHANGES.rst b/CHANGES.rst
@@ -81,6 +81,8 @@ cube_build
 
 - Fix a bug when creating internal_cal type cubes [#6398]
 
+- Fix incorrect spatial footprint for single band MRS IFU cubes [#6478]
+
 dark_current
 ----------
 

diff --git a/jwst/cube_build/ifu_cube.py b/jwst/cube_build/ifu_cube.py
@@ -1227,6 +1227,17 @@ def setup_ifucube_wcs(self):
                 world = False
                 if self.coord_system == 'skyalign':
                     world = True
+                # Do not use the default spatial or spectral region found in the wcs if
+                # 1. instrument is MIRI and
+                # 2. Output type is not multi and (not default calspec2) and
+                # 3. Channel is 1 or 3 - channel with smaller FOV on detector
+                if self.instrument == 'MIRI' and self.output_type != 'multi':
+                    ch1 = '1'
+                    ch3 = '3'
+                    if ch1 in self.list_par1 or ch3 in self.list_par1:
+                        spatial_found = False
+                        spectral_found = False
+
                 if(spectral_found & spatial_found & world):
                     [lmin,lmax] = input_model.meta.wcsinfo.spectral_region
                     spatial_box = input_model.meta.wcsinfo.s_region

diff --git a/jwst/fits_generator/tests/dotfile/._05181.prop b/jwst/fits_generator/tests/dotfile/._05181.prop
-Original file line number
+Diff line change
@@ Expand Up / @@ -81,6 +81,8 @@ cube_build @@
     - Fix a bug when creating internal_cal type cubes [#6398]
+    - Fix incorrect spatial footprint for single band MRS IFU cubes [#6478]
     dark_current
     ----------
@@ Expand Down @@