Kiyotsugu Hirayama publishes observations of asteroids with unusually closely spaced orbits, kick-starting the study of asteroid families. Hirayama 1918
The American Astronomical Society (AAS) have partnered with IOP Publishing to create an exciting new collection of astronomy and astrophysics ebooks to further the AAS mission: "to enhance and share humanity's scientific understanding of the universe."
In keeping with our mission, the entire AAS journals portfolio was made freely accessible as of 1 January 2022. Read more.
