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20973 (1981 EL2)
Classification: Main-belt Asteroid          SPK-ID: 2020973
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 .1664357731871421 6.1016e-08  
a 2.617972479772468 1.6973e-08 au
q 2.182248205918878 1.662e-07 au
i 10.7624570592733 4.9981e-06 deg
node 227.7390492302304 2.8877e-05 deg
peri 97.57799083305822 3.2159e-05 deg
M .2261666151877639 1.3857e-05 deg
tp 2459199.527987074862
(2020-Dec-16.02798708)
5.9553e-05 TDB
period 1547.198523350344
4.24
1.5047e-05
4.12e-08
d
yr
n .2326786088319465 2.2628e-09 deg/d
Q 3.053696753626059 1.9798e-08 au
  Orbit Determination Parameters
   # obs. used (total)      921  
   data-arc span      14553 days (39.84 yr)  
   first obs. used      1981-02-02  
   last obs. used      2020-12-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54134  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:29  

Additional Information
 Earth MOID = 1.20086 au 
 Jupiter MOID = 2.36245 au 
 T_jup = 3.362 
[ 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 14.81   n/a E2021B10  
diameter diameter 7.311 km 0.197 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 463.696 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.048   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20973 (1981 EL2)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EL2 = 1998 FC100 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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