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26820 (1987 SR9)
Classification: Main-belt Asteroid          SPK-ID: 2026820
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2490540147013807 4.4521e-08  
a 2.32373768955572 7.2632e-09 au
q 1.745001488858957 1.0078e-07 au
i 4.183149220927898 5.9751e-06 deg
node 39.3474735914992 4.8697e-05 deg
peri 275.585923096683 5.0591e-05 deg
M 111.7648491502759 1.5768e-05 deg
tp 2458598.818513621700
(2019-Apr-25.31851362)
5.5663e-05 TDB
period 1293.835550225238
3.54
6.0661e-06
1.661e-08
d
yr
n .2782424705653893 1.3045e-09 deg/d
Q 2.902473890252482 9.0721e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1001  
   data-arc span      12108 days (33.15 yr)  
   first obs. used      1987-08-26  
   last obs. used      2020-10-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52408  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:26:48  

Additional Information
 Earth MOID = .737635 au 
 Jupiter MOID = 2.41052 au 
 T_jup = 3.530 
[ 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 15.3   n/a MPO502358  

26820 (1987 SR9)          Discovered 1987-Sep-20 by Elst, E. W. at Smolyan
Reference: 20010804/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1987 SR9 = 1987 RL = 1998 XJ66 = 2001 KG73 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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