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20239 (1998 DT12)
Classification: Main-belt Asteroid          SPK-ID: 2020239
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1698727112204476 3.4253e-08  
a 2.326713060470162 8.73e-09 au
q 1.93146800465607 8.1907e-08 au
i 3.411047010632903 3.6989e-06 deg
node 333.9715807684483 6.2638e-05 deg
peri 1.763245818016358 6.3749e-05 deg
M 317.6350699143014 1.3874e-05 deg
tp 2459353.051562989341
(2021-May-18.55156299)
5.0466e-05 TDB
period 1296.321333826583
3.55
7.2958e-06
1.997e-08
d
yr
n .2777089218591532 1.563e-09 deg/d
Q 2.721958116284253 1.0213e-08 au
  Orbit Determination Parameters
   # obs. used (total)      992  
   data-arc span      8680 days (23.76 yr)  
   first obs. used      1996-09-17  
   last obs. used      2020-06-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51173  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:15:53  

Additional Information
 Earth MOID = .919864 au 
 Jupiter MOID = 2.64265 au 
 T_jup = 3.552 
[ 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 15.75   n/a E2021B10  
diameter diameter 1.760 km 0.443 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.360   0.157 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20239 (1998 DT12)          Discovered 1998-Feb-24 by Spacewatch at Kitt Peak
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 DT12 = 1978 NP5 = 1996 TO49 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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