(15091) Howell Outer Main-belt Asteroid
Discovered on 9 February 1999 by Spacewatch at Kitt Peak.
Noted student of cataclysmic variable stars, master of high-precision photometry and explorer of TOADs (tremendous outburst amplitude dwarf novae), Steve B. Howell (b. 1955) is equally at home developing theoretical stellar models, working with the latest instrumentation or mentoring students in esoteric astrophysics.Naming citation (20030614/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Howell is today
Seen from above the solar system on 2026-10-14: Howell is 3.45 au from the Sun and 2.70 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 15091 |
| Provisional designation | 1999 CM136 |
| Orbit class | Outer Main-belt Asteroid |
| Diameter | 8.84 km (#5,876 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0820 |
| Rotation period | 10.9 hours |
| Absolute magnitude (H) | 13.96 |
| Orbital period | 5.80 years |
| Semi-major axis | 3.23 au |
| Perihelion – aphelion | 2.99 – 3.47 au |
| Eccentricity | 0.0748 |
| Inclination | 7.27° |
| Closest distance between its orbit and Earth's (MOID) | 1.98 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.