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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 ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05698400542760675 3.86e-08  
a 3.079975020238842 2.3269e-08 au
q 2.904465706968659 1.2718e-07 au
i 9.757892463411919 4.8679e-06 deg
node 191.125367007565 2.4699e-05 deg
peri 99.89155257189449 4.9559e-05 deg
M 19.49508794120412 4.2585e-05 deg
tp 2459093.584193569610
(2020-Sep-01.08419357)
0.0002335 TDB
period 1974.327606575696
5.41
2.2374e-05
6.126e-08
d
yr
n .1823405592876197 2.0663e-09 deg/d
Q 3.255484333509026 2.4595e-08 au
  Orbit Determination Parameters
   # obs. used (total)      996  
   data-arc span      14462 days (39.59 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-09-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49951  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:40  

Additional Information
 Earth MOID = 1.90806 au 
 Jupiter MOID = 1.86578 au 
 T_jup = 3.203 
[ 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 14.18   n/a E2021B10  
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

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