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20188 (1997 AC18)
Classification: Main-belt Asteroid          SPK-ID: 2020188
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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09596820661617583 3.4795e-08  
a 2.592897590276831 1.0525e-08 au
q 2.34406185859856 9.0514e-08 au
i 8.627629878761251 3.2644e-06 deg
node 101.6291120567965 2.5775e-05 deg
peri 107.2935895362277 3.2067e-05 deg
M 197.1756491008925 2.1333e-05 deg
tp 2459890.252570743093
(2022-Nov-06.75257074)
9.2658e-05 TDB
period 1525.023278743957
4.18
9.2856e-06
2.542e-08
d
yr
n .2360619703434979 1.4373e-09 deg/d
Q 2.841733321955102 1.1535e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1971  
   data-arc span      25577 days (70.03 yr)  
   first obs. used      1951-02-04  
   last obs. used      2021-02-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45382  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:14:48  

Additional Information
 Earth MOID = 1.35438 au 
 Jupiter MOID = 2.1685 au 
 T_jup = 3.396 
[ 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 14.02   n/a E2021B10  
diameter diameter 4.830 km 0.123 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.229   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20188 (1997 AC18)          Discovered 1997-Jan-15 by Kobayashi, T. at Oizumi
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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