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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02949069126618716 3.5829e-08  
a 2.87126294826483 1.4158e-08 au
q 2.786587419113509 1.0683e-07 au
i 1.33265986645974 4.86e-06 deg
node 333.5249488683509 0.00015775 deg
peri 129.3919017676709 0.00018451 deg
M 349.7940787926442 9.4355e-05 deg
tp 2459250.879933196485
(2021-Feb-05.37993320)
0.00046581 TDB
period 1777.083673511305
4.87
1.3144e-05
3.599e-08
d
yr
n .2025790936949429 1.4984e-09 deg/d
Q 2.95593847741615 1.4576e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1604  
   data-arc span      9217 days (25.23 yr)  
   first obs. used      1995-11-24  
   last obs. used      2021-02-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54388  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:31:49  

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 | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.06   n/a E2021B10  

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

[ show close-approach data ]
Alternate Designations
 1997 CQ11 = 1998 HL98 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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