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21051 (1990 UM)
Classification: Main-belt Asteroid          SPK-ID: 2021051
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3166984084290931 4.6342e-08  
a 2.758651930603473 1.5796e-08 au
q 1.884991254771508 1.2667e-07 au
i 10.93243104061394 4.7585e-06 deg
node 70.3081693293709 2.2072e-05 deg
peri 305.7972957921651 2.3095e-05 deg
M 252.8446682084893 1.1667e-05 deg
tp 2459894.644193623272
(2022-Nov-11.14419362)
5.7473e-05 TDB
period 1673.569636770846
4.58
1.4374e-05
3.935e-08
d
yr
n .2151090651325512 1.8476e-09 deg/d
Q 3.632312606435439 2.0799e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1027  
   data-arc span      11241 days (30.78 yr)  
   first obs. used      1990-10-20  
   last obs. used      2021-07-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5118  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:56:39  

Additional Information
 Earth MOID = .910621 au 
 Jupiter MOID = 1.91278 au 
 T_jup = 3.242 
[ 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 14.46   n/a MPO614063  
diameter diameter 6.981 km 0.276 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.076   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21051 (1990 UM)          Discovered 1990-Oct-20 by Urata, T. at Oohira
Reference: 20010208/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
1910-May-10 11:15 00:03 Jupiter 1.92086558196421 1.92086501337594 1.92086615056132 1.40275838908788 1.04202378664297 2418801.968614928 2.75665177028879 598.35577195483 260.307398238142 45.2374325515292 921267.380398538 T 31 CATAB v2.0g-lin.ifort 2021-Aug-25 14:56:43 2021-Aug-25 14:56
1970-May-19 03:09 00:01 Jupiter 1.92446537095432 1.92446473666203 1.9244660052592 2.05894861269336 1.83275790143754 2440725.631406844 1.16528177232749 323.342089143543 43.5025682273824 86.7548802664996 1365251.22207172 T 31 CATAB v2.0g-lin.ifort 2021-Aug-25 14:56:43 2021-Aug-25 14:56
2052-Sep-19 17:58 < 00:01 Jupiter 1.92052346305773 1.92052291838598 1.92052400773571 1.53861397336963 1.2187117499544 2470800.248366763 0.984177697867963 438.578987241844 113.628679274796 71.1619740949389 1521774.40955899 T 31 CATAB v2.0g-lin.ifort 2021-Aug-25 14:56:43 2021-Aug-25 14:56
2112-Sep-28 10:17 00:02 Jupiter 1.91053703306088 1.91053653780756 1.91053752832582 2.13951381070848 1.92115436342769 2492722.928361591 2.43631928797153 344.028491424369 48.1283779798582 89.9348556923835 1361900.1057796 T 31 CATAB v2.0g-lin.ifort 2021-Aug-25 14:56:43 2021-Aug-25 14:56
2195-Feb-06 00:25 00:05 Jupiter 1.92481102022841 1.92480968694505 1.92481235354306 1.68130642161808 1.39523528254426 2522803.517189160 4.64393039992002 585.498754694861 134.191296931392 63.4996545959837 1293335.25596978 T 31 CATAB v2.0g-lin.ifort 2021-Aug-25 14:56:43 2021-Aug-25 14:56

Alternate Designations
 1990 UM = 1999 SM8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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