Thetis (17): Thetis was discovered in 1852 and is a large main-belt asteroid with a diameter of 90Km. Thetis, named after the sea nymph and mother of Achilles in Greek mythology, is associated with themes of nurturing, protection, and vulnerability. In astrology, Thetis may signify maternal instincts, emotional sensitivity, or the need for emotional healing. Its placement in a chart could indicate areas where individuals may experience deep emotional connections or seek refuge and support.