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52864 (1998 SR21)
Classification: Main-belt Asteroid          SPK-ID: 2052864
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0634383976165484 3.838e-08  
a 2.379844318687368 9.9641e-09 au
q 2.228870808532995 8.9429e-08 au
i 6.205758744581105 4.4766e-06 deg
node 213.1578934598083 3.8763e-05 deg
peri 248.3023993830053 5.307e-05 deg
M 146.4985140164649 3.6266e-05 deg
tp 2458054.802495800636
(2017-Oct-28.30249580)
0.00013487 TDB
period 1340.976752089731
3.67
8.4217e-06
2.306e-08
d
yr
n .2684610299462601 1.686e-09 deg/d
Q 2.530817828841741 1.0596e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1042  
   data-arc span      8158 days (22.34 yr)  
   first obs. used      1996-01-15  
   last obs. used      2018-05-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5515  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-04 01:04:06  

Additional Information
 Earth MOID = 1.25446 au 
 Jupiter MOID = 2.56663 au 
 T_jup = 3.528 
[ 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 15.0   n/a MPO337680  
diameter diameter 2.258 km 0.414 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.417   0.133 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

52864 (1998 SR21)          Discovered 1998-Sep-21 by Spacewatch at Kitt Peak
Reference: 20030216/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 SR21 = 1998 UD37 = 2000 EZ91 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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