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JPL Small-Body Database Browser
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48400 (1981 EZ21)
Classification: Main-belt Asteroid          SPK-ID: 2048400
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04100420440030181 3.6504e-08  
a 2.839002389646144 1.6816e-08 au
q 2.722591355368148 1.0382e-07 au
i 1.539395772398562 4.5922e-06 deg
node 204.147878312674 0.00015631 deg
peri 58.62077196827369 0.00016679 deg
M 350.2904153102307 5.9184e-05 deg
tp 2459047.624333121627
(2020-Jul-17.12433312)
0.0002873 TDB
period 1747.217874484484
4.78
1.5524e-05
4.25e-08
d
yr
n .2060418481617342 1.8306e-09 deg/d
Q 2.95541342392414 1.7505e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1136  
   data-arc span      13937 days (38.16 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-04-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51836  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 02:46:17  

Additional Information
 Earth MOID = 1.70734 au 
 Jupiter MOID = 2.05748 au 
 T_jup = 3.308 
[ 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 14.6   n/a MPO474362  
diameter diameter 3.327 km 0.535 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.277   0.131 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

48400 (1981 EZ21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20021120/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
1939-Apr-20 08:56 00:03 Iris 0.0472214698407177 0.0472135590798059 0.047229382005828 4.27678159599828 4.27678156753293 2429373.871964159 3.16112425705171 568.478279674875 51.8132013461659 -46.3241319676703 98933.5038162615 T 24 CATAB v2.0e-lin.ifort 2019-Jul-13 02:46:22 2019-Jul-13 02:46
1944-Jul-10 18:19 < 00:01 Psych 0.00715035639848583 0.00714127473391317 0.00715944613849771 3.00966601850531 3.00966545628413 2431282.262917279 0.483543520358157 591.419028540238 52.7449257592241 -40.2944730517058 13164.7398070469 T 24 CATAB v2.0e-lin.ifort 2019-Jul-13 02:46:22 2019-Jul-13 02:46

Alternate Designations
 1981 EZ21 = 1997 TJ16 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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