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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457175.5 (2015-Jun-02.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09132386764063963 1.7429e-08  
q 1.959967714103262 3.8719e-08 au
tp 2456900.929252374520
(2014-Aug-31.42925237)
2.6792e-05 TDB
node 34.24989226697258 7.0043e-06 deg
peri 243.640730241064 1.0732e-05 deg
i 4.354704165895053 1.2064e-06 deg
  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
 Jupiter MOID = 2.72078 au 
 T_jup = 3.691 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.037672685512852E-16 -6.697324716182343E-16 -2.699155192925535E-13 2.190894043021025E-14 -1.144615193563006E-13 4.196579840991861E-15
q -6.697324716182343E-16 1.499188428549738E-15 6.161310725020306E-13 -4.854656150651428E-14 2.603683664321539E-13 -9.303070645271228E-15
tp -2.699155192925535E-13 6.161310725020306E-13 7.178266662335942E-10 5.551135453741566E-12 2.123772394743458E-10 5.36325509389097E-14
node 2.190894043021025E-14 -4.854656150651428E-14 5.551135453741566E-12 4.905994582886426E-11 -4.840815967045508E-11 6.014781845309032E-12
peri -1.144615193563006E-13 2.603683664321539E-13 2.123772394743458E-10 -4.840815967045508E-11 1.151802485048837E-10 -6.512069257960024E-12
i 4.196579840991861E-15 -9.303070645271228E-15 5.36325509389097E-14 6.014781845309032E-12 -6.512069257960024E-12 1.45532557615887E-12

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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