(21619) Johnshopkins Main-belt Asteroid
Discovered on 9 May 1999 by LONEOS at Anderson Mesa.
Johns Hopkins (1795-1873) was a wealthy entrepreneur and philanthropist of Baltimore, Maryland. He is best known for his creation, under the terms of his will, of The Johns Hopkins University and its affiliated institutions, including the Applied Physics Laboratory.Naming citation (20080718/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Johnshopkins is today
Seen from above the solar system on 2026-10-14: Johnshopkins is 2.30 au from the Sun and 3.13 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21619 |
| Provisional designation | 1999 JN136 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.70 km (#15,853 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.201 |
| Rotation period | 5.26 hours |
| Absolute magnitude (H) | 14.8 |
| Orbital period | 3.41 years |
| Semi-major axis | 2.26 au |
| Perihelion – aphelion | 2.11 – 2.42 au |
| Eccentricity | 0.0699 |
| Inclination | 5.50° |
| Closest distance between its orbit and Earth's (MOID) | 1.12 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.