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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .06451207674966131 | 7.5899e-08 | |
| a | 2.604385315417121 | 3.6235e-08 | au |
| q | 2.43637101006324 | 1.9152e-07 | au |
| i | 13.90624676995713 | 7.2229e-06 | deg |
| node | 238.3991750156576 | 2.3153e-05 | deg |
| peri | 170.4980861459548 | 5.1399e-05 | deg |
| M | 320.7062702671915 | 4.4782e-05 | deg |
| tp | 2459564.062579247332
(2021-Dec-15.56257925) | 0.00019156 | TDB |
| period | 1535.16932445008
4.20 | 3.2038e-05
8.772e-08 | d
yr |
| n | .234501819614561 | 4.894e-09 | deg/d |
| Q | 2.772399620771001 | 3.8573e-08 | au |
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| | Orbit Determination Parameters
Additional Information
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[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
16.05 |
|
n/a |
MPCxxxxx |
|
|
| 281507 Johnellen | Discovered 2008 Oct. 7 by D. McDonald at Celbridge. |
| Named for the parents of the discoverer, John and Ellen McDonald, for their inspiration and encouragement of his interest in astronomy. |
| NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) |
| Reference: MPC batch dated 2019-05-18 | Last Updated: 2019-05-29 |
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