(9144) Hollisjohnson Main-belt Asteroid
Discovered on 25 October 1955 by Indiana University at Brooklyn.
Hollis R. Johnson (b. 1928), emeritus professor at Indiana University, has carried out studies of the effects of molecules and grains, including CO and water vapor, on stellar opacities. His efforts to model carbon-rich stars have led to some of the first quantitative estimates of carbon abundances in such stars.Naming citation (20040713/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Hollisjohnson is today
Seen from above the solar system on 2026-10-14: Hollisjohnson is 2.53 au from the Sun and 3.44 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9144 |
| Provisional designation | 1955 UN1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 10.8 km (#4,651 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0390 |
| Rotation period | 10.5 hours |
| Absolute magnitude (H) | 13.52 |
| Orbital period | 3.61 years |
| Semi-major axis | 2.35 au |
| Perihelion – aphelion | 1.73 – 2.97 au |
| Eccentricity | 0.264 |
| Inclination | 10.9° |
| Closest distance between its orbit and Earth's (MOID) | 0.734 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.