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JPL Small-Body Database Browser
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27981 (1997 UK21)
Classification: Main-belt Asteroid          SPK-ID: 2027981
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1669899555490374 3.7547e-08  
a 2.587304536290408 1.0397e-08 au
q 2.15525066678345 9.6309e-08 au
i 4.056751048210623 4.1478e-06 deg
node 23.40876310604649 6.3211e-05 deg
peri 72.60122687098593 6.4951e-05 deg
M 24.20516151548593 1.3807e-05 deg
tp 2458498.294272008098
(2019-Jan-14.79427201)
5.8201e-05 TDB
period 1520.09157441666
4.16
9.1628e-06
2.509e-08
d
yr
n .2368278372558911 1.4276e-09 deg/d
Q 3.019358405797366 1.2133e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1489  
   data-arc span      15534 days (42.53 yr)  
   first obs. used      1976-10-22  
   last obs. used      2019-05-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48046  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 03:29:19  

Additional Information
 Earth MOID = 1.17624 au 
 Jupiter MOID = 2.16515 au 
 T_jup = 3.398 
[ 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 14.2   n/a MPO267808  

27981 (1997 UK21)          Discovered 1997-Oct-20 by Beijing Schmidt CCD Asteroid Program at Xinglong
Reference: 20010902/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1997 UK21 = 1976 UM10 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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