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49371 (1998 WZ21)
Classification: Main-belt Asteroid          SPK-ID: 2049371
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01919357442980425 3.7171e-08  
a 2.655781326468051 1.0784e-08 au
q 2.604807389909201 1.0003e-07 au
i 1.000105684408032 4.0171e-06 deg
node 162.6663957374238 0.000208 deg
peri 229.3110429216128 0.00023066 deg
M 58.99101629344532 9.8202e-05 deg
tp 2458941.457946777524
(2020-Apr-01.95794678)
0.00043135 TDB
period 1580.836286939054
4.33
9.6283e-06
2.636e-08
d
yr
n .227727566082799 1.387e-09 deg/d
Q 2.706755263026899 1.0991e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1484  
   data-arc span      10061 days (27.55 yr)  
   first obs. used      1993-08-15  
   last obs. used      2021-03-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45971  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 10:16:23  

Additional Information
 Earth MOID = 1.60694 au 
 Jupiter MOID = 2.34603 au 
 T_jup = 3.388 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456821.5 (2014-Jun-13.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0199085209528769 3.7865e-08  
q 2.602890558913888 1.019e-07 au
tp 2457336.498455333299
(2015-Nov-09.99845533)
0.00040771 TDB
node 162.6662618106963 0.00020813 deg
peri 223.8424497542138 0.00022841 deg
i .9992707423621353 4.0191e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1484  
   data-arc span      10061 days (27.55 yr)  
   first obs. used      1993-08-15  
   last obs. used      2021-03-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45971  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 10:16:23  

Additional Information
 Jupiter MOID = 2.34603 au 
 T_jup = 3.388 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.433749764680936E-15 -3.837472857391533E-15 -2.514952252993906E-12 7.495889117968776E-15 -5.932555167328959E-13 -5.833327938155278E-17
q -3.837472857391533E-15 1.038279212068464E-14 6.297714656349018E-12 -2.047369433102223E-14 1.480296289314636E-12 1.784054409171923E-16
tp -2.514952252993906E-12 6.297714656349018E-12 1.662293354708123E-7 -7.374664719095817E-11 3.836964430296847E-8 -6.66648013510663E-13
node 7.495889117968776E-15 -2.047369433102223E-14 -7.374664719095817E-11 4.33188074725431E-8 -4.332892582838063E-8 1.625961391713105E-10
peri -5.932555167328959E-13 1.480296289314636E-12 3.836964430296847E-8 -4.332892582838063E-8 5.216955346004384E-8 -1.627291389685212E-10
i -5.833327938155278E-17 1.784054409171923E-16 -6.66648013510663E-13 1.625961391713105E-10 -1.627291389685212E-10 1.615342971452696E-11

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 14.5   n/a MPO347861  
diameter diameter 3.304 km 0.599 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.281   0.124 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49371 (1998 WZ21)          Discovered 1998-Nov-18 by LINEAR at Socorro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1998 WZ21 = 1993 PP8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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