About the Object

Name: Cas A
Distance: 11000 light years
Constellation: Cassiopeia
Category: MIRI
Nebulae
Stars

Coordinates

Position (RA):23 23 25.96
Position (Dec):58° 49' 5.35"
Field of view:7.41 x 7.41 arcminutes
Orientation:North is 0.5° left of vertical



Colours & filters

BandWavelengthTelescope
Infrared5.6 μmJames Webb Space Telescope
MIRI
Infrared
PAH
7.7 μmJames Webb Space Telescope
MIRI
Infrared
Silicate
10 μmJames Webb Space Telescope
MIRI
Infrared
PAH
11 μmJames Webb Space Telescope
MIRI
Infrared12 μmJames Webb Space Telescope
MIRI
Infrared
Silicate
18 μmJames Webb Space Telescope
MIRI
Infrared21 μmJames Webb Space Telescope
MIRI
Infrared25 μmJames Webb Space Telescope
MIRI

Cassiopeia A (MIRI Image)

Cassiopeia A (Cas A) is a supernova remnant located about 11,000 light-years from Earth in the constellation Cassiopeia. It spans approximately 10 light-years. This new image uses data from Webb’s Mid-Infrared Instrument (MIRI) to reveal Cas A in a new light.

On the remnant’s exterior, particularly at the top and left, lie curtains of material appearing orange and red due to emission from warm dust. This marks where ejected material from the exploded star is ramming into surrounding circumstellar material. 

Interior to this outer shell lie mottled filaments of bright pink studded with clumps and knots. This represents material from the star itself, and likely shines due to a mix of various heavy elements and dust emission. The stellar material can also be seen as fainter wisps near the cavity’s interior.

A loop represented in green extends across the right side of the central cavity. Its shape and complexity are unexpected and challenging for scientists to understand.

This image combines various filters with the colour red assigned to 25.5 microns (F2550W), orange-red to 21 microns (F2100W), orange to 18 microns (F1800W), yellow to 12.8 microns (F1280W), green to 11.3 microns (F1130W), cyan to 10 microns (F1000W), light blue to 7.7 microns (F770W), and blue to 5.6 microns (F560W). The data comes from the general observer program 1947.

[Image description: A roughly square image is rotated clockwise about 45 degrees. Within the image is a circular-shaped nebula with complex structure. On the circle’s exterior lie curtains of material glowing orange. Interior to this outer shell lies a ring of mottled filaments of bright pink studded with clumps and knots. At center right, a greenish loop extends from the right side of the ring into the central cavity. Translucent wisps of blue, green, and red appear throughout the image.]

Credit:

NASA, ESA, CSA, D. Milisavljevic (Purdue University), T. Temim (Princeton University), I. De Looze (UGent), J. DePasquale (STScI)

About the Image

Id: weic2311a
Type: Observation
Release date: 7 April 2023, 16:00
Related releases: weic2311
Related announcements: ann2401
Size: 4008 x 4009 px


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