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21031 (1989 TO15)
Classification: Main-belt Asteroid          SPK-ID: 2021031
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2309883572368119 2.7937e-08  
a 2.311089320201141 6.9469e-09 au
q 1.777254594700339 6.4493e-08 au
i 2.579706961767962 4.5557e-06 deg
node 199.3047976567821 7.6771e-05 deg
peri 221.3396803149251 7.7576e-05 deg
M 287.4146151763408 1.1534e-05 deg
tp 2459459.243951131765
(2021-Sep-01.74395113)
4.1664e-05 TDB
period 1283.286196439287
3.51
5.7862e-06
1.584e-08
d
yr
n .2805297843917327 1.2649e-09 deg/d
Q 2.844924045701942 8.5516e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1249  
   data-arc span      10812 days (29.60 yr)  
   first obs. used      1989-10-03  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53592  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 23:17:20  

Additional Information
 Earth MOID = .790212 au 
 Jupiter MOID = 2.49712 au 
 T_jup = 3.547 
[ 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 15.7   n/a MPO337435  
diameter diameter 1.794 km 0.365 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.346   0.125 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21031 (1989 TO15)          Discovered 1989-Oct-03 by Debehogne, H. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1989 TO15 = 1994 CW2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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