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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1506535204659744 5.4565e-08  
a 3.136899977592472 3.2179e-08 AU
q 2.66431495261853 1.7866e-07 AU
i 14.73978900850627 7.2843e-06 deg
node 231.8485895695664 2.457e-05 deg
peri 248.063310304241 3.4443e-05 deg
M 283.0882816221234 2.6716e-05 deg
tp 2457434.050256335686
(2016-Feb-15.55025634)
0.00015364 JED
period 2029.314850488928
5.56
3.1226e-05
8.549e-08
d
yr
n .1773997760442468 2.7297e-09 deg/d
Q 3.609485002566415 3.7027e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      959  
   data-arc span      23954 days (65.58 yr)  
   first obs. used      1949-03-29  
   last obs. used      2014-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53583  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 12:51:13  

Additional Information
 Earth MOID = 1.72213 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 10.8 mag n/a MPO267718  
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) (688)
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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