| 12923 Zephyr (1999 GK4) |
| Classification: Apollo [NEO, PHA] SPK-ID: 2012923 |
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| Orbit Diagram
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| Note:
Make sure you have Java enabled on your browser to see the applet.
This applet is provided as a 3D orbit visualization tool.
The applet was implemented using 2-body methods,
and hence should not be used for determining accurate long-term trajectories
(over several years or decades) or planetary encounter circumstances.
For accurate long-term ephemerides, please instead use our Horizons system. |
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Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.
Orbit Viewer applet originally written and kindly provided by
Osamu Ajiki (AstroArts),
and further modified by
Ron Baalke (JPL).
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Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB
Reference: JPL 144 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .4914351297738366 | 5.2205e-08 | |
| a | 1.962127913221515 | 6.649e-09 | AU |
| q | .9978693275546326 | 1.0199e-07 | AU |
| i | 5.289296794097655 | 6.5964e-06 | deg |
| node | 168.3557658199326 | 5.7818e-05 | deg |
| peri | 146.7527320940758 | 5.8383e-05 | deg |
| M | 345.7957632019878 | 7.4447e-06 | deg |
| tp | 2456440.109996499611
(2013-May-27.60999650) | 2.0858e-05 | JED |
| period | 1003.897565397908
2.75 | 5.1028e-06
1.397e-08 | d
yr |
| n | .3586023239904057 | 1.8228e-09 | deg/d |
| Q | 2.926386498888398 | 9.9165e-09 | 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 |
16.1 |
mag |
n/a |
PDS3 (MPC 37098) |
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| rotation period |
rot_per |
3.891 |
h |
n/a |
Asteroid Lightcurve DataBase (Rev. 2013-May-01) |
Incomplete or inconclusive result.
Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (1999) http://www.asu.cas.cz/~ppravec/neo.htm] |
| SMASSII spectral type |
spec_B |
S: |
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n/a |
Binzel et al. (2004) Icarus 170, 259-294 |
SMASSIR data only, classification consistent with specified type, but uncertain |
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| 12923 Zephyr | Discovered 1999 Apr. 11 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station. |
| The word zephyr derives from the name of the ancient Greek god of the west wind, Zephyros. The name was suggested by M. Smitherman. |
| NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) |
| Reference: 20040928/MPCPages.arc | Last Updated: 2004-09-28 |
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[ show close-approach data ]
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