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20740 Semery (1999 XB228)
Classification: Main-belt Asteroid          SPK-ID: 2020740
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1637560971465278 5.6517e-08  
a 3.134672078965974 3.4702e-08 AU
q 2.621350413480314 1.8549e-07 AU
i 6.474322262178343 6.1747e-06 deg
node 110.9858505613889 4.8435e-05 deg
peri 203.0546503151544 5.2847e-05 deg
M 279.5888145333894 2.5724e-05 deg
tp 2457253.293896674493
(2015-Aug-18.79389667)
0.0001484 JED
period 2027.153335160104
5.55
3.3662e-05
9.216e-08
d
yr
n .1775889340761523 2.949e-09 deg/d
Q 3.647993744451634 4.0385e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1103  
   data-arc span      21825 days (59.75 yr)  
   first obs. used      1954-09-27  
   last obs. used      2014-06-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56387  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:45:28  

Additional Information
 Earth MOID = 1.60783 AU 
 T_jup = 3.182 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.8 mag n/a MPO257015  

20740 Sémery           Discovered 1999 Dec. 13 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Alain Sémery (b. 1944) is an engineer at Paris Observatory. He has contributed to the design and development of many instruments aboard spacecraft involved in solar system exploration.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

[ show close-approach data ]
Alternate Designations
 1999 XB228 = 1954 SA1 = 1971 UC4 = 1998 MK25 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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