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21992 (1999 XZ23)
Classification: Main-belt Asteroid          SPK-ID: 2021992
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09137510342984749 1.7446e-08  
a 2.157301369961969 5.3726e-09 au
q 1.960177734152342 3.8811e-08 au
i 4.354346058887623 1.2066e-06 deg
node 34.20797003650702 7.0017e-06 deg
peri 243.5981734162611 1.0731e-05 deg
M 56.44848687267066 9.5064e-06 deg
tp 2459215.025979932447
(2020-Dec-31.52597993)
3.0202e-05 TDB
period 1157.349839539252
3.17
4.3234e-06
1.184e-08
d
yr
n .3110554714755204 1.162e-09 deg/d
Q 2.354425005771595 5.8635e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2408  
   data-arc span      16506 days (45.19 yr)  
   first obs. used      1976-05-30  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .495  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:47:00  

Additional Information
 Earth MOID = .948413 au 
 Jupiter MOID = 2.72078 au 
 T_jup = 3.691 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.45   n/a MPO636393  
diameter diameter 3.673 km 0.221 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.250   0.058 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21992 (1999 XZ23)          Discovered 1999-Dec-06 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XZ23 = 1998 HM61 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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