Comet 21P/Giacobini-Zinner
Named after Michel Giacobini who discovered the comet on December 20, 1900 at Nice Observatory, France, and Ernst Zinner who recovered the comet two passages later.
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| Classification | Jupiter-family Comet, NEO |
| Notes | parent body of the Giacobinids meteor shower |
Osculating Orbital Elements
| Epoch | 2453803,5 |
| Semi major axis | 3,5259 AU |
| Period [Julian yrs] | 6,621 Julian years |
| Inclination | 31,811 ° |
| Eccentricity | 0,7056 |
| Lon. of ascending node | 195,429 ° |
| Argument of perihelion | 172,535 ° |
| Passage of perihelion | 2005-Jul-02.749694 |
| Aphelion distance | 6,0139 AU |
| Mean anomaly | 37,105 ° |
Physical Data
| Radius | 1,00 km |
| Total magnitude (M1) | 8,5 |
| Total magnitude slope (k1) | 18 |
Discovery Circumstances
| Discoverer | Michel Giacobini |
| Discovered | 1900-12-20 |
Data File
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