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JPL Small-Body Database Browser
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20984 (1981 EH33)
Classification: Main-belt Asteroid          SPK-ID: 2020984
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05671338960667542 3.9637e-08  
a 3.079192688026534 2.319e-08 au
q 2.904561233436459 1.2927e-07 au
i 9.753998374468351 5.0531e-06 deg
node 191.2288158488437 2.5518e-05 deg
peri 100.550901086045 5.1166e-05 deg
M 342.3415772042752 4.445e-05 deg
tp 2459097.306192068672
(2020-Sep-04.80619207)
0.00024376 TDB
period 1973.575417684483
5.40
2.2295e-05
6.104e-08
d
yr
n .182410054753506 2.0606e-09 deg/d
Q 3.253824142616609 2.4505e-08 au
  Orbit Determination Parameters
   # obs. used (total)      896  
   data-arc span      13961 days (38.22 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-05-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52146  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:48:05  

Additional Information
 Earth MOID = 1.90997 au 
 Jupiter MOID = 1.86997 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 14.2   n/a MPO474041  
diameter diameter 5.095 km 0.200 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.171   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20984 (1981 EH33)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
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
1941-Aug-03 05:27 00:03 Jupiter 1.92699132973272 1.92699059827423 1.92699206119318 3.54634191322546 3.42015013969749 2430209.726935722 2.55011419342389 122.757978251724 19.0653962870163 73.055234490028 3080467.11525561 T 21 CATAB v2.0e-lin.ifort 2019-Jul-12 23:48:12 2019-Jul-12 23:48
1951-Jun-13 13:22 00:02 Jupiter 1.96373269641771 1.96373198302406 1.96373340981404 4.4109663455942 4.31207123143634 2433811.056873889 2.08450488564287 153.896870135646 20.0206919966985 -79.6201320846082 3452792.58910612 T 21 CATAB v2.0e-lin.ifort 2019-Jul-12 23:48:12 2019-Jul-12 23:48
2001-Feb-08 03:33 < 00:01 Jupiter 1.954647809506 1.95464734635942 1.95464827265269 3.40999107906948 3.28045177242955 2451948.648227695 0.495435560833807 54.9991729191433 17.8783915373646 78.1419811801438 3540673.7548844 T 21 CATAB v2.0e-lin.ifort 2019-Jul-12 23:48:12 2019-Jul-12 23:48
2010-Dec-15 03:09 < 00:01 Jupiter 1.93688117906027 1.9368807356835 1.93688162243705 4.39794697764597 4.29736110277119 2455545.631158697 0.196607260231152 38.1116663888043 20.0436935167481 -85.6526130996325 3452553.14435182 T 21 CATAB v2.0e-lin.ifort 2019-Jul-12 23:48:12 2019-Jul-12 23:48
2060-Aug-17 01:19 00:02 Jupiter 1.98341858539432 1.98341796536288 1.98341920542609 3.28182783640889 3.14901418046047 2473688.555181525 1.70446304978649 64.1193019648336 21.6017537110903 67.594748305659 3418161.15421172 T 21 CATAB v2.0e-lin.ifort 2019-Jul-12 23:48:12 2019-Jul-12 23:48
2070-Jun-17 10:38 00:02 Jupiter 1.91535381278596 1.91535315749217 1.91535446808224 4.36602073427141 4.26352924786435 2477279.942808871 1.91805668447354 152.461719595885 19.6551339636711 -81.2431398977762 3360210.26824083 T 21 CATAB v2.0e-lin.ifort 2019-Jul-12 23:48:12 2019-Jul-12 23:48
2129-Dec-19 16:54 00:04 Jupiter 1.89969477271306 1.89969396834126 1.89969557709835 4.31294197185785 4.20829211783516 2499014.204054572 3.90986394222674 306.132646772919 19.3212477956497 -84.3022241388686 3322708.53133937 T 21 CATAB v2.0e-lin.ifort 2019-Jul-12 23:48:12 2019-Jul-12 23:48
2189-Jun-22 05:03 00:06 Jupiter 1.89037440319762 1.89037365538789 1.89037515103626 4.23720359621434 4.13010311206877 2520748.710411556 5.93330478594721 456.903469088901 19.0731473046595 -87.0061194813031 3270205.52642771 T 21 CATAB v2.0e-lin.ifort 2019-Jul-12 23:48:12 2019-Jul-12 23:48

Alternate Designations
 1981 EH33 = 1998 KQ60 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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