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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456770.5 (2014-Apr-23.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2195198530672726 4.1535e-08  
q 2.36759522444493 1.3146e-07 au
tp 2455815.371632495859
(2011-Sep-10.87163250)
4.4977e-05 TDB
node 51.47476711877179 0.00011349 deg
peri 297.5157411540511 0.00011378 deg
i 2.02028281109769 4.3227e-06 deg
  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
 Jupiter MOID = 1.72951 au 
 T_jup = 3.204 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.725168521674607E-15 -5.432708619956918E-15 1.995774977324065E-13 8.266905384678577E-15 2.779582259594546E-14 -6.71901619538918E-16
q -5.432708619956918E-15 1.728054448698905E-14 -4.785118175212696E-13 -2.80651997511137E-14 -4.388031670920496E-14 2.363968178705214E-15
tp 1.995774977324065E-13 -4.785118175212696E-13 2.022957433666423E-9 5.656626526983443E-12 3.834763165496449E-10 -4.926691391490288E-15
node 8.266905384678577E-15 -2.80651997511137E-14 5.656626526983443E-12 1.287927458194079E-8 -1.287047815953373E-8 -1.488903689141896E-10
peri 2.779582259594546E-14 -4.388031670920496E-14 3.834763165496449E-10 -1.287047815953373E-8 1.294590509600681E-8 1.488387783387031E-10
i -6.71901619538918E-16 2.363968178705214E-15 -4.926691391490288E-15 -1.488903689141896E-10 1.488387783387031E-10 1.868609858824568E-11

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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1907-Mar-02 07:05 00:03 Jupiter 1.9708299530595 1.97082859496774 1.97083131115014 2.701991598866 2.53795181161372 2417636.795351642 2.9387636856785 43.1802545064521 22.4387745709427 85.1902158206274 778023.556391556 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 01:46:18 2021-Apr-13 01:46
1945-Oct-20 07:27 00:02 Jupiter 1.85018274200389 1.85018188065181 1.85018360335461 1.65643672450005 1.3520994984321 2431748.810651512 1.9689940066109 106.258826396049 70.2041852148519 85.5023493314375 1268407.62942807 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 01:46:18 2021-Apr-13 01:46
1955-Feb-02 20:45 00:02 Jupiter 1.87945174542637 1.87945096326056 1.87945252759166 2.13866374085877 1.91638512895818 2435141.364496511 1.68070409285243 58.685066548763 12.7778102699368 -77.7698619152933 1405175.51689808 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 01:46:18 2021-Apr-13 01:46
1993-Sep-22 05:03 < 00:01 Jupiter 1.94128415101002 1.9412836201761 1.94128468184371 2.00469602930356 1.77374313723455 2449252.710207785 0.638488674495573 68.5592526791723 13.7063410568317 87.2899744134201 2099603.34508501 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 01:46:18 2021-Apr-13 01:46
2003-Jan-07 00:22 < 00:01 Jupiter 1.80188217391292 1.80188180718866 1.80188254063688 1.71070904906662 1.40938724279797 2452646.515173274 0.365756686271897 67.2533812243888 35.1504869703993 -66.9340352727681 2475922.41767018 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 01:46:18 2021-Apr-13 01:46
2050-Dec-09 05:14 00:01 Jupiter 1.74592234498722 1.7459220107886 1.74592267918644 1.42711848563457 1.03265705408648 2470149.718123313 1.0878664707777 153.52019809068 86.9859517109934 -54.9139251356412 2623675.32480698 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 01:46:18 2021-Apr-13 01:46
2098-Nov-06 07:04 00:02 Jupiter 1.72522624090193 1.72522589452087 1.72522658728652 1.30104006376514 0.843077069940576 2487648.794288297 2.46268378873845 337.414651908516 192.988551231973 -59.3475835370683 2205226.11675637 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 01:46:18 2021-Apr-13 01:46
2146-Oct-02 23:20 00:04 Jupiter 1.73478482013318 1.7347842414045 1.73478539886028 1.29715352309374 0.84029240538642 2505145.472149660 3.88876369474305 309.833821446153 277.242293296323 -9.7978591557389 1447252.39125631 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 01:46:18 2021-Apr-13 01:46
2194-Aug-30 21:17 00:05 Jupiter 1.77432058619264 1.7743192447482 1.77432192763134 1.40225411839702 1.00576319278745 2522644.387065538 5.37889334116703 334.391337866042 172.185588111476 -3.24379904298516 740785.776760883 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 01:46:18 2021-Apr-13 01:46

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