The Order of the Eastern Star is a Freemasonry-related fraternal organization open to both men and women. It was established in 1850 by Boston, Massachusetts lawyer and educator Rob Morris, a former Freemason official. The order is based on teachings from the Bible, but is open to people of all religious beliefs. It has approximately 10,000 chapters in twenty countries and approximately 500,000 members under its General Grand Chapter.
More information can be found here: OES Star of Jupiter #312