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(2021 AN4)
Classification: Apollo [NEO]          SPK-ID: 54105111
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3078473477711625 0.00036297  
a 1.464196996601563 0.00081519 au
q 1.01344783458327 3.2808e-05 au
i 1.060758268593832 0.0010534 deg
node 271.5589502460818 0.0035704 deg
peri 207.8175702539386 0.0065145 deg
M 341.3125951795133 0.014406 deg
tp 2459234.092643986268
(2021-Jan-19.59264399)
0.0027036 TDB
period 647.1391801711662
1.77
0.54044
0.00148
d
yr
n .5562945515132945 0.00046457 deg/d
Q 1.914946158619856 0.0010661 au
  Orbit Determination Parameters
   # obs. used (total)      23  
   data-arc span      8 days  
   first obs. used      2021-01-10  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      7  
   norm. resid. RMS      .49117  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jan-21 05:19:39  

Additional Information
 Earth MOID = .0306899 au 
 Jupiter MOID = 3.1744 au 
 T_jup = 4.563 
[ 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 27.49   .58013 E2021-BA4 autocmod 2.8

[ 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
1935-Nov-01 07:24 9_22:50 Earth 0.399787990384015 0.382175349609528 0.418013795517028 4.08660215921003 4.08497096024399 2428107.808534204 14330.4440095965 1186795.04743744 1694.91807238323 41.2607859791922 7592.03946154384 T 4 CATAB v2.0f-lin.ifort 2021-Jan-21 05:19:39 2021-Jan-21 05:19
1936-Mar-07 11:19 1_19:44 Earth 0.35706190797793 0.340976662746494 0.373172552292286 14.35657178491 14.3560519972672 2428234.971226985 2624.48458203549 816665.82094157 1357.39789632596 -10.6118754873599 5340.41294333341 T 4 CATAB v2.0f-lin.ifort 2021-Jan-21 05:19:39 2021-Jan-21 05:19
2012-Aug-06 10:57 3_05:16 Mars 0.0113177837175941 0.01118748918009 0.108818370224937 9.50247638005497 9.49981400741524 2456145.956266140 4635.71746184463 5316512.60244009 635.965236263818 -81.7357828939511 2638.42449905112 T 4 CATAB v2.0f-lin.ifort 2021-Jan-21 05:19:39 2021-Jan-21 05:19
2014-Apr-27 09:49 8_22:34 Earth 0.499239464905974 0.441219750763969 0.557259545551227 5.96923065702521 5.9683364921293 2456774.909237013 12874.1570551032 2893296.43243058 132.861290614178 1.76848777961704 7921.37717671341 T 4 CATAB v2.0f-lin.ifort 2021-Jan-21 05:19:39 2021-Jan-21 05:19
2021-Jan-19 21:41 00:04 Earth 0.0306171434474648 0.0305138354629125 0.0307204419754192 3.61842601589666 3.59429483590069 2459234.403777229 4.15911175066752 5080.49717780847 112.87803463311 -1.05205597357954 508.504776421183 T 4 CATAB v2.0f-lin.ifort 2021-Jan-21 05:19:39 2021-Jan-21 05:19
2027-Oct-17 11:15 9_00:10 Earth 0.497500299810429 0.439651438067192 0.55605007937816 6.04430955519671 6.04342341150884 2461695.968658714 12970.3802403884 3047963.67486964 494.314706187548 17.7435005565303 20772.9454096701 T 4 CATAB v2.0f-lin.ifort 2021-Jan-21 05:19:39 2021-Jan-21 05:19
2066-Nov-01 01:45 7_11:28 Earth 0.412132036771141 0.375807334076109 0.448694020784714 4.32251632847139 4.32102038736588 2475955.572907408 10768.1649127696 1883029.8936913 340.552105353399 15.4702575807767 15475.7321412596 T 4 CATAB v2.0f-lin.ifort 2021-Jan-21 05:19:39 2021-Jan-21 05:19
2067-Mar-11 03:19 3_21:54 Earth 0.375225195120163 0.314775166958531 0.435696543894662 14.9002515040736 14.8997749263802 2476085.638536301 5633.49333650078 3018227.50392321 337.644928128737 2.70288623761568 6209.45954461167 T 4 CATAB v2.0f-lin.ifort 2021-Jan-21 05:19:39 2021-Jan-21 05:19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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