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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1536041256841593 2.2454e-08  
a 3.134864841283623 1.341e-08 au
q 2.653336668200241 7.1883e-08 au
i 14.76254073462681 6.955e-07 deg
node 231.7781348400504 2.8027e-06 deg
peri 247.4488477612271 9.1335e-06 deg
M 314.2043774466036 6.7619e-06 deg
tp 2459458.398089563748
(2021-Aug-31.89808956)		 3.8329e-05 TDB
period 2027.340323514469
5.55		 1.3008e-05
3.561e-08		 d
yr
n .1775725544569284 1.1394e-09 deg/d
Q 3.616393014367004 1.547e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2974  
   data-arc span      26282 days (71.96 yr)  
   first obs. used      1949-03-29  
   last obs. used      2021-03-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38771  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 14:19:04  

Additional Information
 Earth MOID = 1.71089 au 
 Jupiter MOID = 1.82565 au 
 T_jup = 3.143 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457523.5 (2016-May-15.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .151003120981924 2.3241e-08  
q 2.663782364185555 7.4786e-08 au
tp 2457434.457640865929
(2016-Feb-15.95764087)		 3.9241e-05 TDB
node 231.8372677213697 2.8042e-06 deg
peri 248.1798937425699 9.1997e-06 deg
i 14.74008533619305 6.9493e-07 deg
   Orbit Determination Parameters
   # obs. used (total)      2974  
   data-arc span      26282 days (71.96 yr)  
   first obs. used      1949-03-29  
   last obs. used      2021-03-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38771  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 14:19:04  

Additional Information
 Jupiter MOID = 1.82565 au 
 T_jup = 3.143 
Orbit Covariance (6×6)
  e q tp node peri i
e 5.401639434018189E-16 -1.717116274700032E-15 7.440058086972127E-13 1.53792486919718E-14 1.727916526629308E-13 -1.745364958498326E-15
q -1.717116274700032E-15 5.593018078331719E-15 -2.427026880506288E-12 -4.916471443847446E-14 -5.645638860541378E-13 5.776525144472867E-15
tp 7.440058086972127E-13 -2.427026880506288E-12 1.539826341660335E-9 2.870094714410738E-11 3.442437012232904E-10 -1.778185244690101E-12
node 1.53792486919718E-14 -4.916471443847446E-14 2.870094714410738E-11 7.863739722114709E-12 -6.299351829410315E-13 -9.733716372781315E-13
peri 1.727916526629308E-13 -5.645638860541378E-13 3.442437012232904E-10 -6.299351829410315E-13 8.463533665920749E-11 4.684706519076352E-13
i -1.745364958498326E-15 5.776525144472867E-15 -1.778185244690101E-12 -9.733716372781315E-13 4.684706519076352E-13 4.829251984463163E-13

[ 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 11.01   n/a E2021B10  
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. 2020-October); 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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