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

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1534956882185319 3.9855e-08  
a 3.134057170013002 1.9534e-08 au
q 2.652992907785632 1.2704e-07 au
i 14.76410615958907 4.4406e-06 deg
node 231.7765785447383 1.9116e-05 deg
peri 247.5293469513347 2.591e-05 deg
M 278.598529313471 2.0487e-05 deg
tp 2459458.735307627246
(2021-Sep-01.23530763)
0.00011784 TDB
period 2026.556883487715
5.55
1.8947e-05
5.187e-08
d
yr
n .1776412016525478 1.6608e-09 deg/d
Q 3.615121432240372 2.2532e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2345  
   data-arc span      26058 days (71.34 yr)  
   first obs. used      1949-03-29  
   last obs. used      2020-08-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4192  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:56:57  

Additional Information
 Earth MOID = 1.71072 au 
 Jupiter MOID = 1.82669 au 
 T_jup = 3.143 
[ 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 10.9   n/a MPO347542  
diameter diameter 32.040 km 0.085 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 18.231 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Franco, L.; Klinglesmith III, D.A.; Marchini, A. (2016) Minor Planet Bull. 43, 203-204.]
geometric albedo albedo 0.044   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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