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JPL Small-Body Database Browser
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243999 (2001 SG21)
Classification: Main-belt Asteroid          SPK-ID: 2243999
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1912844638099744 4.5574e-08  
a 2.717799271594918 1.134e-08 au
q 2.197926495184745 1.2298e-07 au
i 3.785737973710659 4.1008e-06 deg
node 80.94637034984656 7.3239e-05 deg
peri 302.5344328168795 7.4571e-05 deg
M 325.5057161862644 1.0839e-05 deg
tp 2458757.308328443495
(2019-Sep-30.80832844)
4.9275e-05 TDB
period 1636.531969890594
4.48
1.0243e-05
2.804e-08
d
yr
n .2199773708203616 1.3768e-09 deg/d
Q 3.237672048005091 1.3509e-08 au
  Orbit Determination Parameters
   # obs. used (total)      489  
   data-arc span      8987 days (24.61 yr)  
   first obs. used      1995-04-26  
   last obs. used      2019-12-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49663  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 16:30:17  

Additional Information
 Earth MOID = 1.20368 au 
 Jupiter MOID = 2.21809 au 
 T_jup = 3.330 
[ 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 16.1   n/a MPO454792  
diameter diameter 1.872 km 0.341 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.183   0.058 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

243999 (2001 SG21)          Discovered 2001-Sep-16 by LINEAR at Socorro
Reference: 20100726/Numbers.arcLast Updated: 2010-07-28

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