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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09114645615355452 1.7515e-08  
a 2.157095300396089 5.302e-09 au
q 1.960483708179498 3.8947e-08 au
i 4.354144858068725 1.2081e-06 deg
node 34.23115281730465 7.0098e-06 deg
peri 243.7230212806386 1.0796e-05 deg
M 355.3628618235915 9.4726e-06 deg
tp 2459215.405617148539
(2020-Dec-31.90561715)		 3.0477e-05 TDB
period 1157.184015083613
3.17		 4.2664e-06
1.168e-08		 d
yr
n .3111000457208942 1.147e-09 deg/d
Q 2.353706892612679 5.7853e-09 au
   Orbit Determination Parameters
   # obs. used (total)      2343  
   data-arc span      16120 days (44.13 yr)  
   first obs. used      1976-05-30  
   last obs. used      2020-07-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49596  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:07:11  

Additional Information
 Earth MOID = .947053 au 
 Jupiter MOID = 2.72289 au 
 T_jup = 3.691 
[ 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 14.44   n/a E2021B10  
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

[ show close-approach data ]
Alternate Designations
 1999 XZ23 = 1998 HM61 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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