The Taurus Molecular Cloud 1 (TMC-1, aka
Taurus Molecular Cloud or TMC) is a nearby star-forming region
in the constellation Taurus.
It is close to us, making it is of interest for study.
It is within the Taurus-Auriga Complex, which contains numerous such
regions, including Taurus Molecular Cloud 2 (TMC-2).
TMC-1 characteristics:
It is large enough in the sky that these low-precision coordinates apply.
I've run across the following correspondences regarding
designators for these
nebulae but I've also seen conflicting information
so I'm not totally convinced: