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20989 (1981 EZ45)
Classification: Main-belt Asteroid          SPK-ID: 2020989
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1240934776306158 3.6951e-08  
a 3.178204060880275 1.7692e-08 au
q 2.783809666345896 1.1789e-07 au
i 5.858316695738534 4.223e-06 deg
node 161.1990324521354 3.4793e-05 deg
peri 197.2232729512016 3.8003e-05 deg
M 173.1949048824323 1.6535e-05 deg
tp 2458204.856861666297
(2018-Mar-27.35686167)
9.2068e-05 TDB
period 2069.526987779708
5.67
1.728e-05
4.731e-08
d
yr
n .1739527931386031 1.4525e-09 deg/d
Q 3.572598455414654 1.9887e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1700  
   data-arc span      14651 days (40.11 yr)  
   first obs. used      1981-02-02  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51428  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:42  

Additional Information
 Earth MOID = 1.77879 au 
 Jupiter MOID = 1.87291 au 
 T_jup = 3.180 
[ 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 13.66   n/a E2021B10  
diameter diameter 10.341 km 0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 6.4073 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 0.072   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20989 (1981 EZ45)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1981 EZ45 = 1998 FJ144 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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