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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1667397689413676 3.3676e-08  
a 2.586978175180596 9.5867e-09 au
q 2.155626031994623 8.4617e-08 au
i 4.0567933406567 3.9716e-06 deg
node 23.40515514482723 5.2105e-05 deg
peri 72.57336165604451 5.3499e-05 deg
M 119.0031005531137 1.2692e-05 deg
tp 2458498.107265397686
(2019-Jan-14.60726540)		 5.2476e-05 TDB
period 1519.803968268127
4.16		 8.448e-06
2.313e-08		 d
yr
n .2368726543135911 1.3167e-09 deg/d
Q 3.01833031836657 1.1185e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1582  
   data-arc span      15894 days (43.52 yr)  
   first obs. used      1976-10-22  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48785  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 06:25:00  

Additional Information
 Earth MOID = 1.17653 au 
 Jupiter MOID = 2.16511 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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