(15904) Halstead Main-belt Asteroid
Discovered on 29 September 1997 by T. Stafford at Zeno.
Susan Ruth Halstead (b. 1959) is the sister of the discoverer.Naming citation (20040713/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Halstead is today
Seen from above the solar system on 2026-10-14: Halstead is 2.18 au from the Sun and 1.30 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 15904 |
| Provisional designation | 1997 SD11 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.81 km (#13,189 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.211 |
| Absolute magnitude (H) | 14.31 |
| Orbital period | 3.18 years |
| Semi-major axis | 2.16 au |
| Perihelion – aphelion | 2.11 – 2.22 au |
| Eccentricity | 0.0256 |
| Inclination | 3.05° |
| Closest distance between its orbit and Earth's (MOID) | 1.12 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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