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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .08442549538652648 | 3.8377e-08 | |
| a | 3.087700403575553 | 1.2697e-08 | au |
| q | 2.82701976739851 | 1.188e-07 | au |
| i | 9.802642705887324 | 4.2583e-06 | deg |
| node | 42.57996851814977 | 1.9656e-05 | deg |
| peri | 162.6626203757233 | 2.8094e-05 | deg |
| M | 187.2634900144232 | 2.158e-05 | deg |
| tp | 2460151.395514299243
(2023-Jul-25.89551430) | 0.00012115 | TDB |
| period | 1981.760458031198
5.43 | 1.2224e-05
3.347e-08 | d
yr |
| n | .181656667202678 | 1.1205e-09 | deg/d |
| Q | 3.348381039752597 | 1.3769e-08 | au |
|
| | 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 |
10.41 |
|
n/a |
MPCxxxxx |
|
| diameter |
diameter |
43.31 |
km |
3.1 |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 2 |
| rotation period |
rot_per |
21.982 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List:
[Ferrero, A. (2012) Minor Planet Bull. 39, 138-139.] |
| geometric albedo |
albedo |
0.0714 |
|
0.011 |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 2 |
|
| 1421 Esperanto (1936 FQ) Discovered 1936-Mar-18 by Vaisala, Y. at Turku |
| Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
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Alternate Designations
| 1936 FQ = 1931 HC = 1958 GD = A906 UD = A917 XD = A920 GD |
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