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18621 (1998 DD12)
Classification: Main-belt Asteroid          SPK-ID: 2018621
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0992237840019243 3.5237e-08  
a 2.422476572612737 1.0138e-08 au
q 2.182109280422089 8.6298e-08 au
i 7.09556430803082 4.0034e-06 deg
node 152.0320060011807 3.592e-05 deg
peri 291.7078232154907 4.3998e-05 deg
M 41.85714253778752 2.4052e-05 deg
tp 2458840.376571028697
(2019-Dec-22.87657103)
9.2014e-05 TDB
period 1377.170798929463
3.77
8.6454e-06
2.367e-08
d
yr
n .2614054845483539 1.641e-09 deg/d
Q 2.662843864803385 1.1144e-08 au
  Orbit Determination Parameters
   # obs. used (total)      951  
   data-arc span      10966 days (30.02 yr)  
   first obs. used      1990-01-24  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52379  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:29:36  

Additional Information
 Earth MOID = 1.20995 au 
 Jupiter MOID = 2.50916 au 
 T_jup = 3.495 
[ 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 15.3   n/a MPO266054  

18621 (1998 DD12)          Discovered 1998-Feb-23 by Spacewatch at Kitt Peak
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 DD12 = 1990 BR3 = 1992 SJ8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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