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JPL Small-Body Database Browser
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56013 (1998 UB21)
Classification: Main-belt Asteroid          SPK-ID: 2056013
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .270197303405153 3.6209e-08  
a 2.321823423986201 8.6034e-09 au
q 1.69447299584221 8.4156e-08 au
i 21.58129628288061 5.7719e-06 deg
node 227.2131312695397 1.0737e-05 deg
peri 259.5114639076569 1.4486e-05 deg
M 344.8092574273415 1.016e-05 deg
tp 2459055.027892514853
(2020-Jul-24.52789251)
3.6583e-05 TDB
period 1292.237111612893
3.54
7.1825e-06
1.966e-08
d
yr
n .2785866438634235 1.5484e-09 deg/d
Q 2.949173852130192 1.0928e-08 au
  Orbit Determination Parameters
   # obs. used (total)      987  
   data-arc span      12769 days (34.96 yr)  
   first obs. used      1985-01-21  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47792  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 09:13:08  

Additional Information
 Earth MOID = .843575 au 
 Jupiter MOID = 2.58984 au 
 T_jup = 3.437 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457013.5 (2014-Dec-22.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2696727721421773 3.6316e-08  
q 1.695982427590311 8.4404e-08 au
tp 2456470.604297247826
(2013-Jun-27.10429725)
3.4206e-05 TDB
node 227.2360915559784 1.0738e-05 deg
peri 259.591035842736 1.4495e-05 deg
i 21.57642530459463 5.7713e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      987  
   data-arc span      12769 days (34.96 yr)  
   first obs. used      1985-01-21  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47792  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 09:13:08  

Additional Information
 Jupiter MOID = 2.58984 au 
 T_jup = 3.437 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.318823610163024E-15 -3.056632478933956E-15 1.188587837584798E-13 2.868817909212041E-15 8.658952715425859E-14 -7.398108607268055E-15
q -3.056632478933956E-15 7.123959711751076E-15 -2.833600229333195E-13 -5.854071074369113E-15 -1.993810342274339E-13 1.759482945536748E-14
tp 1.188587837584798E-13 -2.833600229333195E-13 1.170052200832104E-9 1.38299190294665E-11 3.378442656545428E-10 -5.836043009486851E-12
node 2.868817909212041E-15 -5.854071074369113E-15 1.38299190294665E-11 1.153091202341077E-10 -1.027167209349679E-10 -9.216293119950151E-12
peri 8.658952715425859E-14 -1.993810342274339E-13 3.378442656545428E-10 -1.027167209349679E-10 2.101051289575966E-10 6.813457583741972E-12
i -7.398108607268055E-15 1.759482945536748E-14 -5.836043009486851E-12 -9.216293119950151E-12 6.813457583741972E-12 3.330815118378179E-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 15.1   n/a MPO502528  
diameter diameter 2.662 km 0.051 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.211   0.046 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

56013 (1998 UB21)          Discovered 1998-Oct-29 by Korlevic, K. at Visnjan
Reference: 20030318/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 UB21 = 1991 XW3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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