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21768 (1999 RL210)
Classification: Main-belt Asteroid          SPK-ID: 2021768
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06143014768257921 1.632e-08  
a 2.798899485777486 1.4063e-08 au
q 2.62696267701748 5.0965e-08 au
i 7.612975775656512 5.6057e-07 deg
node 258.827820947954 1.0999e-05 deg
peri 48.34368401151313 3.5174e-05 deg
M 252.5554337894955 3.3626e-05 deg
tp 2459710.959553709905
(2022-May-11.45955371)
0.00016081 TDB
period 1710.327900394088
4.68
1.289e-05
3.529e-08
d
yr
n .2104859541360753 1.5864e-09 deg/d
Q 2.970836294537492 1.4927e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2118  
   data-arc span      13806 days (37.80 yr)  
   first obs. used      1983-05-06  
   last obs. used      2021-02-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4876  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:04:17  

Additional Information
 Earth MOID = 1.61687 au 
 Jupiter MOID = 2.17792 au 
 T_jup = 3.310 
[ 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 13.4   n/a MPO467964  
diameter diameter 12.228 km 0.080 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.047   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21768 (1999 RL210)          Discovered 1999-Sep-08 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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