Names
- Irwin, John B.1
- Johnson, Harold L. (Harold Lester), 1921-1980.1
- Johnson, Harold Lester, 1921-1
- Johnson, Nelson C.1
- Jordan, David Starr, 1851-1931.1
- Karpinski, Louis Charles, 1878-1956.1
- Karpinski, Louis Charles.1878-1956.1
- Keller, Geoffrey, 1918-1
- Keller, Kaufman Thuma, 1885-1966.1
- Kellogg, Remington, 1892-1
- Kellogg, Remington, 1893-1
- Keniston, Hayward, 1883-1
- Kitt Peak National Observatory.1
- Klopsteg, Paul E. (Paul Ernest), 1889-2
- Klopsteg, Paul Ernest, 1889-1
- Kraus, Edward Henry, 1875-1
- Kraus, Edward Henry, 1875-1973.1
- Lamont, Robert Patterson, 1867-1948.2
- Lamont-Hussey Observatory (University of Michigan)1
- Learer, F. H.1