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18428 (1994 AC1)
Classification: Main-belt Asteroid          SPK-ID: 2018428
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1927839009936809 3.2432e-08  
a 2.368535710287437 8.6337e-09 au
q 1.911920156415386 7.858e-08 au
i 8.023206746211718 4.5313e-06 deg
node 301.0109895646182 2.7413e-05 deg
peri 104.9621092320808 3.15e-05 deg
M 126.027014271612 1.525e-05 deg
tp 2458534.399596437554
(2019-Feb-19.89959644)
5.4959e-05 TDB
period 1331.429981518472
3.65
7.2799e-06
1.993e-08
d
yr
n .2703859797339298 1.4784e-09 deg/d
Q 2.825151264159488 1.0298e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1230  
   data-arc span      9607 days (26.30 yr)  
   first obs. used      1994-01-07  
   last obs. used      2020-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51007  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:48:56  

Additional Information
 Earth MOID = .940318 au 
 Jupiter MOID = 2.602 au 
 T_jup = 3.508 
[ 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 15.3   n/a MPO358808  

18428 (1994 AC1)          Discovered 1994-Jan-07 by Kobayashi, T. at Oizumi
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1994 AC1 = 1996 NK3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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