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18557 (1997 CQ11)
Classification: Main-belt Asteroid          SPK-ID: 2018557
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0294906912576113 3.5829e-08  
a 2.871262947827017 1.4146e-08 au
q 2.786587418713232 1.0683e-07 au
i 1.332660006007677 4.8566e-06 deg
node 333.5249530037417 0.00015766 deg
peri 129.3918946029719 0.00018439 deg
M 349.7940819546005 9.4271e-05 deg
tp 2459250.879917576460
(2021-Feb-05.37991758)
0.00046539 TDB
period 1777.083673104848
4.87
1.3133e-05
3.596e-08
d
yr
n .202579093741277 1.4971e-09 deg/d
Q 2.955938476940803 1.4563e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1608  
   data-arc span      9248 days (25.32 yr)  
   first obs. used      1995-11-24  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54383  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:44:53  

Additional Information
 Earth MOID = 1.80355 au 
 Jupiter MOID = 2.07196 au 
 T_jup = 3.297 
[ 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 14.07   n/a MPCxxxxx  

18557 (1997 CQ11)          Discovered 1997-Feb-03 by Spacewatch at Kitt Peak
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1997 CQ11 = 1998 HL98 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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