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2813 Zappala (1981 WZ)
Classification: Main-belt Asteroid          SPK-ID: 2002813
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1507927709033441 5.3239e-08  
a 3.136781115859052 2.8978e-08 au
q 2.663777199681382 1.7501e-07 au
i 14.74059318526637 7.0699e-06 deg
node 231.8461094944082 2.3014e-05 deg
peri 248.1538984586932 3.279e-05 deg
M 353.9888918787989 2.5317e-05 deg
tp 2457434.382604611662
(2016-Feb-15.88260461)
0.00014289 JED
period 2029.199511014815
5.56
2.8119e-05
7.699e-08
d
yr
n .1774098594277513 2.4584e-09 deg/d
Q 3.609785032036722 3.3348e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1219  
   data-arc span      24369 days (66.72 yr)  
   first obs. used      1949-03-29  
   last obs. used      2015-12-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5098  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 12:45:15  

Additional Information
 Earth MOID = 1.72159 au 
 Jupiter MOID = 1.83809 au 
 T_jup = 3.143 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.9 mag n/a MPO347542  
diameter diameter 32.57 km 1.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 9
geometric albedo albedo 0.0663   0.008 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 9
SMASSII spectral type spec_B T   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

2813 Zappala (1981 WZ)          Discovered 1981-Nov-24 by Bowell, E. at Flagstaff (AM)
Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1981 WZ = 1931 VZ = 1949 FC = 1964 TH = 1979 OS14 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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