We present Spitzer observations of the dark globule CB190 ( L771 ) .
We observe a roughly circular 24 \micron shadow with a 70 \arcsec radius .
The extinction profile of this shadow matches the profile derived from 2MASS photometry at the outer edges of the globule and reaches a maximum of \sim 32 visual magnitudes at the center .
The corresponding mass of CB190 is \sim 10 \hbox { M } _ { \odot } .
Our ^ { 12 } CO and ^ { 13 } CO J = 2-1 data over a 10 \arcmin \times 10 \arcmin region centered on the shadow show a temperature \sim 10 K. The thermal continuum indicates a similar temperature for the dust .
The molecular data also show evidence of freezeout onto dust grains .
We estimate a distance to CB190 of 400 pc using the spectroscopic parallax of a star associated with the globule .
Bonnor-Ebert fits to the density profile , in conjunction with this distance , yield \xi _ { max } = 7.2 , indicating that CB 190 may be unstable .
The high temperature ( 56 K ) of the best fit Bonnor-Ebert model is in contradiction with the CO and thermal continuum data , leading to the conclusion that the thermal pressure is not enough to prevent free-fall collapse .
We also find that the turbulence in the cloud is inadequate to support it .
However , the cloud may be supported by the magnetic field , if this field is at the average level for dark globules .
Since the magnetic field will eventually leak out through ambipolar diffusion , it is likely that CB 190 is collapsing or in a late pre-collapse stage .