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19945 (1981 ET31)
Classification: Main-belt Asteroid          SPK-ID: 2019945
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2309365240760894 3.499e-08  
a 2.989412429977015 1.9196e-08 au
q 2.299047914368267 1.0655e-07 au
i 9.557280463855294 5.2048e-06 deg
node 178.1149874338589 2.4383e-05 deg
peri 269.6610097020815 2.6971e-05 deg
M 277.7711607568803 1.1984e-05 deg
tp 2459431.719944956721
(2021-Aug-05.21994496)
6.4636e-05 TDB
period 1887.892150896544
5.17
1.8184e-05
4.979e-08
d
yr
n .1906888589102079 1.8367e-09 deg/d
Q 3.679776945585763 2.3629e-08 au
  Orbit Determination Parameters
   # obs. used (total)      989  
   data-arc span      14354 days (39.30 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-06-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51717  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:37:38  

Additional Information
 Earth MOID = 1.33909 au 
 Jupiter MOID = 1.70324 au 
 T_jup = 3.195 
[ 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 14.0   n/a MPO449097  

19945 (1981 ET31)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010109/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
1935-Nov-15 22:05 00:03 Jupiter 1.85913015555228 1.85912895247894 1.85913135862329 1.82021535771635 1.54983254517451 2428122.420078750 2.58709053039846 156.011159670322 105.340753411145 -53.3278185415433 667807.811651 T 18 CATAB v2.0f-lin.ifort 2020-Jun-23 18:37:51 2020-Jun-23 18:37
1972-Oct-11 16:30 00:01 Jupiter 1.70541376354065 1.70541319352301 1.70541433355855 0.81044731170187 n/a 2441602.187171380 1.429060384493 80.9867450241907 25.395655605506 80.4432473645354 9917613.33017534 F 18 CATAB v2.0f-lin.ifort 2020-Jun-23 18:37:51 2020-Jun-23 18:37
2009-Aug-30 06:51 < 00:01 Jupiter 1.83657995943309 1.83657938945075 1.83658052941532 2.77982655018941 2.60864802854527 2455073.785628167 0.288389789319232 66.6994838182892 17.4994007850643 82.2534367139548 1834413.53990935 T 18 CATAB v2.0f-lin.ifort 2020-Jun-23 18:37:51 2020-Jun-23 18:37
2055-Feb-11 01:08 00:01 Jupiter 1.76644687987094 1.76644618521408 1.76644757452792 0.959140387928556 n/a 2471674.547385148 1.3756864308117 85.0358436132084 32.9998521561314 82.2769928370859 7943989.26520842 F 18 CATAB v2.0f-lin.ifort 2020-Jun-23 18:37:51 2020-Jun-23 18:37
2092-Jan-10 02:56 00:03 Jupiter 1.7138829703485 1.71388230029169 1.71388364040657 1.68195917351008 1.35667295676082 2485156.622370627 2.55803928017207 335.825031188115 111.829102729915 -44.0211749344675 944993.475957502 T 18 CATAB v2.0f-lin.ifort 2020-Jun-23 18:37:51 2020-Jun-23 18:37
2128-Nov-10 04:35 00:03 Jupiter 1.95281065914546 1.9528087009971 1.95281261730836 3.74197084848656 3.62420407242776 2498609.691117785 3.45706833131596 298.175478520646 21.1378110861961 75.7695599256976 2018053.79144213 T 18 CATAB v2.0f-lin.ifort 2020-Jun-23 18:37:51 2020-Jun-23 18:37
2137-Jun-15 18:27 00:04 Jupiter 1.92063699838497 1.92063494870643 1.92063904806023 1.89086701301161 1.64114459108764 2501749.268610212 4.0485951584334 222.793773126589 72.7087273503685 -54.3688202376195 678300.175604661 T 18 CATAB v2.0f-lin.ifort 2020-Jun-23 18:37:51 2020-Jun-23 18:37
2174-May-19 21:06 00:05 Jupiter 1.70192421179633 1.70192331692159 1.70192510667442 0.87344366780441 n/a 2515236.379069939 5.36044563004902 214.559650439801 36.7568839582011 -83.1253530266816 6876425.17526334 F 18 CATAB v2.0f-lin.ifort 2020-Jun-23 18:37:51 2020-Jun-23 18:37

Alternate Designations
 1981 ET31 = 1989 TN14 = 1999 RU138 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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