Object name: NGC2169
NGC 2169 is often called the 37 cluster. The part on the left is the three and the right the 7 though both are so distorted my brain has a hard time seeing the numbers. WEBDA put the group at a distance of about 3400 light-years and an age of 11.7 million years. They say it is only reddened by 0.2 magnitudes. The young age and lack of reddening explain its blue stars. The cluster is located in Orion's club. It may have been first noted by Giovanni Hodierna prior to 1654 but he published in a very obscure journal. The discovery that brought to the astronomy world's attention was by William Herschel on October 12, 1782.