Cosmos 215 was launched April 19, 1968 and contained an X-ray experiment. Orbit characteristics: 261 × 426 km, at an inclination of 48.5°. The orbital period was ~ 91 minutes. It was intended primarily to perform solar studies, but did detect some non-solar X-ray events. It reentered the atmosphere on June 30, 1968. http://en.wikipedia.org/wiki/Cosmos_215
Asteroid (161) Athor was discovered by James Craig Watson on April 19, 1876 at the Detroit Observatory and named after Hathor, an Egyptian fertility goddess http://en.wikipedia.org/wiki/161_Athor