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JPL Small-Body Database Browser
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12923 Zephyr (1999 GK4)
Classification: Apollo [NEO, PHA]          SPK-ID: 2012923
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 242 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4920120125312745 4.2408e-08  
a 1.961922094160385 5.4232e-09 au
q .9966328561829614 8.2474e-08 au
i 5.304291691148097 5.061e-06 deg
node 168.1903993336454 3.841e-05 deg
peri 147.0677904306691 3.8749e-05 deg
M 197.8951597325679 9.8674e-06 deg
tp 2459452.475137659430
(2021-Aug-25.97513766)
2.9079e-05 TDB
period 1003.739612518435
2.75
4.1618e-06
1.139e-08
d
yr
n .3586587552290991 1.4871e-09 deg/d
Q 2.927211332137809 8.0914e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1190  
   data-arc span      23740 days (65.00 yr)  
   first obs. used      1955-04-21  
   last obs. used      2020-04-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53498  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Apr-19 06:37:46  

Additional Information
 Earth MOID = .0215506 au 
 Jupiter MOID = 2.41029 au 
 T_jup = 3.717 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.7   n/a MPO439181  
diameter diameter 2.060 km 0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
rotation period rot_per 3.891 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (1999) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.199   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
SMASSII spectral type spec_B S:   n/a Binzel et al. (2004) Icarus 170, 259-294 SMASSIR data only, classification consistent with specified type, but uncertain

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.arcLast Updated: 2004-09-28

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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