NGC_1891 is an open star cluster located in the constellation Auriga. It was discovered by the astronomer William Herschel in 1786 and is approximately 3,000 light-years away from Earth. The cluster contains several hundred stars, which are relatively young and share a common origin. The stars in NGC_1891 are primarily of spectral types B and A, indicating they are hot and bright. The cluster is estimated to be around 100 million years old, making it a fascinating object for astronomers studying stellar evolution and the dynamics of star clusters.