Object name: M038
M 38 is an open star cluster in Auriga in 2007. I'd thought I processed and posted it long ago. I was astounded to find I hadn't. The directory only had the raw data. Since there's very little to see here but stars I've reduced it to 1.5" of arc per pixel from my normal 1" per pixel size. Some call it the Pi Cluster as it is supposed to resemble the symbol for the Greek letter À. I've never seen the resemblance myself. (À is upside down in my image with north up.) M38 is in Auriga about 4200 light years from us, it is about 25 light-years across and about 220 million years old (very young). It consists mostly of short-lived blue stars. It was discovered in 1654 by Hodierna but he didn't tell anyone so it was rediscovered 95 years later by Le Gentil in 1749. He did tell the world of his discovery so is usually listed as its discoverer. Messier knew about Le Gentil's discoveries and included most in his list in 1764. Messier didn't even start his catalog until a year after Le Gentil discovered M38.