| Name | |
|---|---|
| Name | Grün |
| Designation | 1981 EY20 |
| Discovery | |
| Discoverer | S. J. Bus |
| Discovery date | March 2, 1981 |
| Orbital elements | |
| Epoch October 27, 2007 (JDCT 2454400.5) | |
| Eccentricity (e) | 0.1080344 |
| Semimajor axis (a) | 2.9376056 AU |
| Perihelion (q) | 2.6202431 AU |
| Aphelion (Q) | 3.2549681 AU |
| Orbital period (P) | 5.03 a |
| Inclination (i) | 1.15251° |
| Longitude of the ascending node (Ω) | 321.29182° |
| Argument of Perihelion (ω) | 20.04081° |
| Mean anomaly (M) | 340.47191° |
4240 Grün is a main belt asteroid with an orbital period of 1839.0292582 days (5.03 years).[1]
The asteroid was discovered on March 2, 1981.
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