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21344 (1997 EM)
Classification: Main-belt Asteroid          SPK-ID: 2021344
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1460927502864819 3.3606e-08  
a 2.733506759964933 1.1944e-08 au
q 2.334161239474966 9.4765e-08 au
i 3.744482370240319 3.8128e-06 deg
node 70.80906184947952 6.0207e-05 deg
peri 198.9629048474993 6.2171e-05 deg
M 51.83912036642713 1.5623e-05 deg
tp 2459158.797484307845
(2020-Nov-05.29748431)
7.1659e-05 TDB
period 1650.739924680431
4.52
1.0819e-05
2.962e-08
d
yr
n .2180840207579598 1.4294e-09 deg/d
Q 3.1328522804549 1.3689e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1564  
   data-arc span      11225 days (30.73 yr)  
   first obs. used      1990-11-14  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48309  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:42:00  

Additional Information
 Earth MOID = 1.31837 au 
 Jupiter MOID = 1.95641 au 
 T_jup = 3.335 
[ 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 14.54   n/a MPO636384  
diameter diameter 4.855 km 0.136 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.143   0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21344 (1997 EM)          Discovered 1997-Mar-02 by Kobayashi, T. at Oizumi
Reference: 20010208/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
1941-May-03 10:30 00:01 Jupiter 1.94606767235131 1.94606732205536 1.94606802264725 2.46533802459788 2.28197176017013 2430117.937496972 1.35226238467312 55.4816410725895 7.72302829148883 -87.8972311629369 2799765.87517383 T 29 CATAB v2.0g-lin.ifort 2021-Aug-24 22:42:12 2021-Aug-24 22:42
2036-Feb-12 19:49 < 00:01 Jupiter 1.96491950353013 1.9649191445687 1.96491986249145 2.57085776288901 2.3973245281049 2464736.325438304 0.427754368396468 46.2234744043789 5.84950560783515 -83.5400910552788 2978462.03856438 T 29 CATAB v2.0g-lin.ifort 2021-Aug-24 22:42:12 2021-Aug-24 22:42
2072-Sep-06 23:22 00:01 Jupiter 1.97997761938824 1.97997723431959 1.97997800445678 2.34772258052287 2.15782607038317 2478092.473675609 1.07975549641901 43.8663838572676 7.36085207645048 -80.5947835705522 3228383.77458237 T 29 CATAB v2.0g-lin.ifort 2021-Aug-24 22:42:12 2021-Aug-24 22:42
2130-Nov-25 09:08 00:02 Jupiter 1.97953179148265 1.97953118153895 1.97953240142725 2.67674405371707 2.5118077294026 2499354.880325885 2.15087743242845 94.7102834117943 6.84922499493261 -84.1177206033218 2717158.0548269 T 29 CATAB v2.0g-lin.ifort 2021-Aug-24 22:42:12 2021-Aug-24 22:42
2167-Jun-20 09:31 00:03 Jupiter 1.96670683245336 1.9667063081933 1.96670735671353 2.33247796836322 2.13988136116112 2512710.896328472 2.81995626035557 53.6581015752716 13.5346143645285 -72.0013543613834 3206949.32679044 T 29 CATAB v2.0g-lin.ifort 2021-Aug-24 22:42:12 2021-Aug-24 22:42

Alternate Designations
 1997 EM = 1990 VM13 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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