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JPL Small-Body Database Browser
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(2021 EN4)
Classification: Apollo [NEO]          SPK-ID: 54131530
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 3 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7570868571927771 0.0004361  
a 3.263670085238563 0.0055654 au
q .7927883574912163 7.1971e-05 au
i 5.658504855844684 0.0023862 deg
node 174.6296324253761 3.8654e-05 deg
peri 301.7827197560033 0.0015792 deg
M 24.17558887677587 0.062955 deg
tp 2459251.878665794539
(2021-Feb-06.37866579)
0.0066955 TDB
period 2153.564100520449
5.90
5.5086
0.01508
d
yr
n .1671647479232215 0.00042759 deg/d
Q 5.73455181298591 0.0097789 au
  Orbit Determination Parameters
   # obs. used (total)      23  
   data-arc span      1 day  
   first obs. used      2021-03-15  
   last obs. used      2021-03-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      7  
   norm. resid. RMS      .47054  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:26:42  

Additional Information
 Earth MOID = .000435974 au 
 Jupiter MOID = .391474 au 
 T_jup = 2.624 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 29.68   .41759 MPO606244 autocmod 2.9c

[ 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
1959-Apr-13 01:43 9_05:50 Venus 0.131922152710292 0.070585111487969 0.221307848689278 9.3236753174438 9.32190966508731 2436671.571633906 13309.5376864606 4879953.73772697 8124.74146323813 31.5811608541181 1031.39700360938 T 3 CATAB v2.0g-lin.ifort 2021-Apr-15 23:26:42 2021-Apr-15 23:26
1960-Dec-07 00:21 8_11:14 Jupiter 0.818033135015546 0.746555167923861 0.909080697627663 9.05919200324862 8.94416479904684 2437275.514746862 12194.3849690574 7547712.94071602 2602.49242717172 -57.5899587151006 40020.6489538401 T 3 CATAB v2.0g-lin.ifort 2021-Apr-15 23:26:42 2021-Apr-15 23:26
2021-Mar-14 21:33 < 00:01 Moon 0.000685844221525578 0.000684773780214196 0.000686914830017244 17.072571281542 17.0697721071161 2459288.397952124 0.795613140627876 56.0590048102023 8.61261114949902 18.0336024671618 3749.23617358518 T 3 CATAB v2.0g-lin.ifort 2021-Apr-15 23:26:42 2021-Apr-15 23:26
2021-Mar-15 03:59 < 00:01 Earth 0.000472859021653359 0.0004720915270805 0.000473626454295942 17.2863644222522 16.9572621194714 2459288.666080176 0.353846400590477 37.2947582528927 0.780956763707128 -0.490509714418696 1407.2216046233 T 3 CATAB v2.0g-lin.ifort 2021-Apr-15 23:26:42 2021-Apr-15 23:26
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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