We report the first high-resolution ( sub-arcminute ) large-scale mapping ^ { 12 } CO and ^ { 13 } CO observations of the molecular clouds associated with the giant outer Galaxy \ion H2 region CTB 102 ( KR 1 ) .
These observations were made using a newly commissioned receiver system on the 13.7-m radio telescope at the Taeduk Radio Astronomy Observatory .
Our observations show that the molecular clouds have a spatial extent of 60 \times 35 pc and a total mass of 10 ^ { 4.8 } -10 ^ { 5.0 } M _ { \sun } .
Infrared data from WISE and 2MASS were used to identify and classify the YSO population associated with ongoing star formation activity within the molecular clouds .
We directly detect 18 class I/class II YSOs and six transition disk objects .
Moving away from the \ion H2 region , there is an age/class gradient consistent with sequential star formation .
The infrared and molecular-line data were combined to estimate the star formation efficiency ( SFE ) of the entire cloud as well as the SFE for various sub-regions of the cloud .
We find that the overall SFE is between \sim 5 – 10 % , consistent with previous observations of giant molecular clouds .
One of the sub-regions , region 1a , is a clear outlier , with a SFE of 17 – 35 % on a 5 pc spatial scale .
This high SFE is more typical for much smaller ( sub-pc scale ) star-forming cores , and we think region 1a is likely an embedded massive protocluster .