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21371 (1997 TD28)
Classification: Jupiter Trojan          SPK-ID: 2021371
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07184295579168316 3.9894e-08  
a 5.227848036937672 1.0096e-07 au
q 4.852263981534321 2.3698e-07 au
i 7.869620018555264 4.3646e-06 deg
node 61.32132309817458 4.2708e-05 deg
peri 55.36298544989472 6.4099e-05 deg
M 260.520577433032 5.1212e-05 deg
tp 2460602.961908034567
(2024-Oct-19.46190803)
0.00064507 TDB
period 4365.991234016888
11.95
0.00012647
3.463e-07
d
yr
n .08245550224542836 2.3885e-09 deg/d
Q 5.603432092341023 1.0821e-07 au
  Orbit Determination Parameters
   # obs. used (total)      891  
   data-arc span      10879 days (29.79 yr)  
   first obs. used      1991-04-08  
   last obs. used      2021-01-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5738  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:44:08  

Additional Information
 Earth MOID = 3.87676 au 
 Jupiter MOID = .010801 au 
 T_jup = 2.976 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.86   n/a E2021B10  

21371 (1997 TD28)          Discovered 1997-Oct-01 by Uppsala-DLR Trojan Survey at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1997 TD28 = 1996 RU32 = 1998 XQ1 = 2000 AG20 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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