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181736 (1995 US21)
Classification: Main-belt Asteroid          SPK-ID: 2181736
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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06188995210925304 4.0144e-08  
a 3.080520753733055 2.8385e-08 au
q 2.889867471812956 1.3104e-07 au
i 2.346027273902505 5.1464e-06 deg
node 8.995236885474728 0.00010898 deg
peri 294.1898523569121 0.00011844 deg
M 308.0762173925444 4.8472e-05 deg
tp 2459485.338347541215
(2021-Sep-27.83834754)
0.000267 TDB
period 1974.852369482685
5.41
2.7295e-05
7.473e-08
d
yr
n .1822921072800507 2.5195e-09 deg/d
Q 3.271174035653154 3.0141e-08 au
  Orbit Determination Parameters
   # obs. used (total)      344  
   data-arc span      9913 days (27.14 yr)  
   first obs. used      1993-04-21  
   last obs. used      2020-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53564  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:31:49  

Additional Information
 Earth MOID = 1.87364 au 
 Jupiter MOID = 1.87928 au 
 T_jup = 3.224 
[ 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 15.79   n/a MPCxxxxx  

181736 (1995 US21)          Discovered 1995-Oct-19 by Spacewatch at Kitt Peak
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

[ 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
1943-Jan-22 15:38 00:03 Jupiter 1.98179023396059 1.9817893694815 1.98179109843967 3.11899962154841 2.97881742051878 2430747.151389729 3.158882950148 58.7459391903632 28.266752062054 -66.0062693630171 2453616.01224995 T 16 CATAB v2.0f-lin.ifort 2021-Apr-13 21:31:50 2021-Apr-13 21:31
1952-Nov-18 17:07 00:03 Jupiter 1.86503296993299 1.86503247599788 1.86503346386821 3.11348820109562 2.96403267581057 2434335.212925016 2.75966156537837 82.265054178255 15.1385107644666 -88.017992284392 2670570.81628715 T 16 CATAB v2.0f-lin.ifort 2021-Apr-13 21:31:50 2021-Apr-13 21:31
2012-Aug-13 08:27 < 00:01 Jupiter 1.86495830372423 1.8649578419671 1.86495876548125 3.00123220202535 2.84588110952708 2456152.851986255 0.276575138703755 40.8217454518154 13.707507796908 -83.2258892640647 2841334.99623761 T 16 CATAB v2.0f-lin.ifort 2021-Apr-13 21:31:50 2021-Apr-13 21:31
2072-May-08 15:07 00:02 Jupiter 1.87712720430374 1.87712669878647 1.8771277098209 2.94496630266771 2.78753649339467 2477971.130167952 2.45794208193288 47.6782157954537 17.6365669677724 87.1170769449361 2953156.57901657 T 16 CATAB v2.0f-lin.ifort 2021-Apr-13 21:31:50 2021-Apr-13 21:31
2082-Mar-08 20:09 00:03 Jupiter 1.96494072981431 1.96493997897491 1.96494148065616 3.81288889091348 3.69810576698693 2481562.339349729 2.83398393440875 143.493864294852 17.7670473896573 -79.8510517413628 3221198.42430808 T 16 CATAB v2.0f-lin.ifort 2021-Apr-13 21:31:50 2021-Apr-13 21:31
2132-Feb-03 07:04 00:05 Jupiter 1.90084720904849 1.90084638831296 1.90084802978402 2.94614708103697 2.79080228031028 2499789.794525697 5.0263239218367 51.0899660297486 30.8270773134808 71.2540006858242 2614437.8389174 T 16 CATAB v2.0f-lin.ifort 2021-Apr-13 21:31:50 2021-Apr-13 21:31
2141-Nov-30 14:09 00:05 Jupiter 1.92810101161158 1.92810000642864 1.92810201680341 3.58256772525655 3.4577714616235 2503378.089353102 5.41115166717194 240.099682751721 16.9502687329006 -82.0631641165332 2992961.00401029 T 16 CATAB v2.0f-lin.ifort 2021-Apr-13 21:31:50 2021-Apr-13 21:31
2191-Oct-30 00:07 00:08 Jupiter 1.93483240964515 1.93483097079874 1.93483384849123 2.99898784330627 2.84927653784233 2521608.505071431 7.54741945311178 61.233324924434 45.1785180666352 -23.7700523143307 1546328.44191806 T 16 CATAB v2.0f-lin.ifort 2021-Apr-13 21:31:50 2021-Apr-13 21:31

Alternate Designations
 1995 US21 = 2006 US278 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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