Final answer:
The question appears to confuse astronomers with astronauts. The names provided relate to respected astronomers, such as Heidi Hammel and Tori Hoehler, who have notable achievements in astronomy but are not identified as astronauts. Without clear information on the institution, specific astronaut alumni cannot be named.
Step-by-step explanation:
It appears that there may be a misunderstanding in the question. The information provided relates to astronomers, not astronauts, and the names mentioned are of notable individuals in the field of astronomy. For example, Heidi Hammel is associated with the Association of Universities for Research in Astronomy, and Tori Hoehler is affiliated with NASA Ames Research Center. These individuals are recognized with accomplishments such as receiving the Education Prize of the American Astronomical Society and having an asteroid named after them by the International Astronomical Union. However, this does not necessarily mean they have become astronauts.
Given the content provided, it does not include details about alumni who have become astronauts. Without additional specific information regarding the institution or the individuals in question, an accurate response naming two alumni who went on to become astronauts cannot be provided.