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16905 (1998 DT21)
Classification: Main-belt Asteroid          SPK-ID: 2016905
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2210036381678353 4.1528e-08  
a 3.03193057462419 1.7928e-08 au
q 2.361862886959949 1.3149e-07 au
i 2.02024727649284 4.324e-06 deg
node 51.44836652410884 0.00011353 deg
peri 297.2148423989923 0.00011382 deg
M 271.8989473906503 1.097e-05 deg
tp 2459672.406437973404
(2022-Apr-02.90643797)
6.1666e-05 TDB
period 1928.312008072379
5.28
1.7103e-05
4.683e-08
d
yr
n .1866917793868177 1.6559e-09 deg/d
Q 3.701998262288432 2.189e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1380  
   data-arc span      10417 days (28.52 yr)  
   first obs. used      1992-01-01  
   last obs. used      2020-07-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55359  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 01:46:12  

Additional Information
 Earth MOID = 1.35463 au 
 Jupiter MOID = 1.72951 au 
 T_jup = 3.204 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.84   n/a E2021B10  
diameter diameter 9.679 km 0.209 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.062   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

16905 (1998 DT21)          Discovered 1998-Feb-22 by Spacewatch at Kitt Peak
Reference: 20000913/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 DT21 = 1999 HD11 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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