(196256) 2003 EH1
An asteroid on a short-period, comet-like orbit believed to be a dormant or extinct comet nucleus — the parent body of the sharp, brief Quadrantid meteor shower.
Orbit & physical parameters
Osculating orbit and physical parameters from the NASA JPL Small-Body Database · Amor · near-Earth · epoch 2026-06-09 (JD 2461200.5 TDB) · Earth MOID 0.212175 au
| Semi-major axis | 3.122961 ± 2.3507e-8 au | NASA JPL · calculated |
| Eccentricity | 0.618659 ± 1.6506e-7 | NASA JPL · calculated |
| Perihelion distance | 1.190915 ± 5.1410e-7 au | NASA JPL · calculated |
| Aphelion distance | 5.055008 ± 3.8050e-8 au | NASA JPL · calculated |
| Inclination | 70.874655 ± 3.2123e-5 deg | NASA JPL · calculated |
| Longitude of ascending node | 283.001218 ± 4.2423e-5 deg | NASA JPL · calculated |
| Argument of perihelion | 171.338854 ± 4.4782e-5 deg | NASA JPL · calculated |
| Orbital period | 2,016 ± 2.2760e-5 d | NASA JPL · calculated |
| Absolute magnitude (H) | 16.1 mag | NASA JPL · catalogued |
Full field-level provenance
- Semi-major axis: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · a · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Otto Matic, 147 obs · retrieved 2026-07-11
- Eccentricity: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · e · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Otto Matic, 147 obs · retrieved 2026-07-11
- Perihelion distance: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · q · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Otto Matic, 147 obs · retrieved 2026-07-11
- Aphelion distance: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · ad · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Otto Matic, 147 obs · retrieved 2026-07-11
- Inclination: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · i · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Otto Matic, 147 obs · retrieved 2026-07-11
- Longitude of ascending node: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · om · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Otto Matic, 147 obs · retrieved 2026-07-11
- Argument of perihelion: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · w · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Otto Matic, 147 obs · retrieved 2026-07-11
- Orbital period: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · per · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Otto Matic, 147 obs · retrieved 2026-07-11
- Absolute magnitude (H): Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · phys_par · phys.H · catalogued value · JPL solution by Otto Matic, 147 obs · retrieved 2026-07-11
Orbital elements are a calculated JPL orbit-determination fit, all referred to the single osculating epoch above (solution by Otto Matic); each carries its own uncertainty. Fields the database did not provide are omitted, never invented.
Classification & origin
Knowledge connections
- Source of meteor showerQuadrantids
Sources
The primary and reference sources this topic draws on.
- NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.
- NASA JPLJet Propulsion Laboratory / Solar System Dynamics
Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.