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21881 (1999 UK15)
Classification: Main-belt Asteroid          SPK-ID: 2021881
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08694416400178648 4.2686e-08  
a 2.768424174545299 1.3275e-08 au
q 2.527725849087122 1.2142e-07 au
i 2.470959382531975 3.3571e-06 deg
node 92.5607409216604 0.00011401 deg
peri 285.8873955672232 0.00011604 deg
M 266.9825614923615 2.3301e-05 deg
tp 2459831.219629931122
(2022-Sep-08.71962993)
0.00011022 TDB
period 1682.470182860951
4.61
1.2101e-05
3.313e-08
d
yr
n .2139711025296384 1.539e-09 deg/d
Q 3.009122500003476 1.4429e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1440  
   data-arc span      10726 days (29.37 yr)  
   first obs. used      1992-03-06  
   last obs. used      2021-07-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52254  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:03:25  

Additional Information
 Earth MOID = 1.53017 au 
 Jupiter MOID = 2.41661 au 
 T_jup = 3.331 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457060.5 (2015-Feb-07.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08500742644685669 4.2345e-08  
q 2.53555228062547 1.2008e-07 au
tp 2456469.723942188944
(2013-Jun-26.22394219)
0.00010584 TDB
node 92.59625218222574 0.00011392 deg
peri 286.8227233618221 0.00011608 deg
i 2.471235886817812 3.3575e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1440  
   data-arc span      10726 days (29.37 yr)  
   first obs. used      1992-03-06  
   last obs. used      2021-07-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52254  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:03:25  

Additional Information
 Jupiter MOID = 2.41661 au 
 T_jup = 3.331 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.793089664515255E-15 -5.058983479740344E-15 -1.305107425713086E-12 3.043414454331555E-15 -3.051748279856744E-13 1.952383182033395E-16
q -5.058983479740344E-15 1.441861295670251E-14 3.861075208416327E-12 -8.54218790510046E-15 9.060889910230371E-13 -4.91645543293083E-16
tp -1.305107425713086E-12 3.861075208416327E-12 1.120256928898764E-8 -1.400886946548509E-11 2.39889051583516E-9 1.100527313300841E-13
node 3.043414454331555E-15 -8.54218790510046E-15 -1.400886946548509E-11 1.297673958068686E-8 -1.29674548348293E-8 2.979743210346201E-11
peri -3.051748279856744E-13 9.060889910230371E-13 2.39889051583516E-9 -1.29674548348293E-8 1.347447564243351E-8 -2.974949283711893E-11
i 1.952383182033395E-16 -4.91645543293083E-16 1.100527313300841E-13 2.979743210346201E-11 -2.974949283711893E-11 1.127270856498142E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.36   n/a MPCxxxxx  
diameter diameter 3.802 km 0.502 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.212   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21881 (1999 UK15)          Discovered 1999-Oct-29 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 UK15 = 1992 EM11 = 1995 YT24 = 1997 EZ58 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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