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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .2173164118991704 | 4.9295e-08 | |
| a | 2.590367795126338 | 1.211e-08 | au |
| q | 2.027438360390317 | 1.2457e-07 | au |
| i | 5.496154866614098 | 4.3501e-06 | deg |
| node | 161.6970218655198 | 5.4318e-05 | deg |
| peri | 95.63492573699689 | 5.5235e-05 | deg |
| M | 77.94010977230761 | 9.7471e-06 | deg |
| tp | 2458670.815076490815
(2019-Jul-06.31507649) | 4.1703e-05 | TDB |
| period | 1522.791959236838
4.17 | 1.0678e-05
2.923e-08 | d
yr |
| n | .2364078676777473 | 1.6578e-09 | deg/d |
| Q | 3.153297229862359 | 1.4741e-08 | au |
|
| | Orbit Determination Parameters
Additional Information
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Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
16.09 |
|
n/a |
E2021B10 |
|
| rotation period |
rot_per |
9.55 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Coley, D. (2012) Minor Planet Bull. 39, 23-24.] |
|
| 39890 Bobstephens | Discovered 1998 Mar. 23 by P. Pravec at Ondřejov. |
| Robert Stephens (b. 1955) is a Californian amateur astronomer who has determined some 30 sets of minor-planet lightcurve parameters since becoming active in the field in 1999. His high-quality work and generosity in sharing his time and knowledge within the amateur community have set a standard for others to follow. |
| NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) |
| Reference: 20020724/MPCPages.arc | Last Updated: 2003-10-02 |
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