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129585 (1997 SM21)
Classification: Main-belt Asteroid          SPK-ID: 2129585
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08539704446529114 4.2945e-08  
a 2.290422283605577 8.8007e-09 au
q 2.094826990008217 9.734e-08 au
i 4.386464784029074 5.1547e-06 deg
node 16.20508678221587 5.1085e-05 deg
peri 160.1202879496198 5.7847e-05 deg
M 46.68207696354676 2.6165e-05 deg
tp 2458836.320307906351
(2019-Dec-18.82030791)
9.1916e-05 TDB
period 1266.110957313817
3.47
7.2974e-06
1.998e-08
d
yr
n .2843352692909131 1.6388e-09 deg/d
Q 2.486017577202936 9.5523e-09 au
  Orbit Determination Parameters
   # obs. used (total)      276  
   data-arc span      8245 days (22.57 yr)  
   first obs. used      1997-09-29  
   last obs. used      2020-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .584  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 21:45:31  

Additional Information
 Earth MOID = 1.09908 au 
 Jupiter MOID = 2.47345 au 
 T_jup = 3.590 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.4   n/a MPO417676  

129585 (1997 SM21)          Discovered 1997-Sep-29 by Spacewatch at Kitt Peak
Reference: 20060711/Numbers.arcLast Updated: 2006-07-17

Alternate Designations
 1997 SM21 = 2004 TT264 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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