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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0992393037569553 3.5069e-08  
a 2.422126940396729 9.7801e-09 au
q 2.181756749220793 8.5613e-08 au
i 7.096035908341226 3.9282e-06 deg
node 152.0322063601566 3.5568e-05 deg
peri 291.614045416008 4.3193e-05 deg
M 94.23075668246341 2.3493e-05 deg
tp 2458840.100686584639
(2019-Dec-22.60068658)
8.9744e-05 TDB
period 1376.87266235946
3.77
8.3394e-06
2.283e-08
d
yr
n .2614620871207441 1.5836e-09 deg/d
Q 2.662497131572664 1.0751e-08 au
  Orbit Determination Parameters
   # obs. used (total)      997  
   data-arc span      11381 days (31.16 yr)  
   first obs. used      1990-01-24  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51728  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:45:45  

Additional Information
 Earth MOID = 1.20929 au 
 Jupiter MOID = 2.50942 au 
 T_jup = 3.496 
[ 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 15.38   n/a MPCxxxxx  

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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