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(1998 SD9)
Classification: Aten [NEO]          SPK-ID: 3014184
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5039366325162311 8.3093e-08  
a .7030857385006629 1.6458e-09 au
q .3487750790704514 5.8167e-08 au
i 3.027530441931931 7.3589e-06 deg
node 166.3200092267022 2.1182e-05 deg
peri 7.045154545714768 2.3609e-05 deg
M 125.8125201533816 2.9646e-05 deg
tp 2458925.245543942366
(2020-Mar-16.74554394)
1.7608e-05 TDB
period 215.3331333616083
0.59
7.5611e-07
2.07e-09
d
yr
n 1.671828177949062 5.8703e-09 deg/d
Q 1.057396397930874 2.4752e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -2.872851843521811E-13 2.626E-15
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      150  
   # delay obs. used      1  
   # Doppler obs. used      0  
   data-arc span      7302 days (19.99 yr)  
   first obs. used      1998-09-18  
   last obs. used      2018-09-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42888  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-25 05:21:11  

Additional Information
 Earth MOID = .00963178 au 
 Jupiter MOID = 3.90698 au 
 T_jup = 8.035 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 24.0   n/a MPO450838  

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