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18546 (1997 AP4)
Classification: Main-belt Asteroid          SPK-ID: 2018546
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1502148669578372 2.1521e-08  
a 2.427421201535467 5.883e-09 au
q 2.062786448696184 5.1905e-08 au
i 1.512511438136157 5.8647e-07 deg
node 198.3410650634497 1.1156e-05 deg
peri 309.5922923330014 9.1229e-06 deg
M 99.50268394853673 3.9573e-06 deg
tp 2458818.689003115777
(2019-Dec-01.18900312)
1.4848e-05 TDB
period 1381.389460302509
3.78
5.0218e-06
1.375e-08
d
yr
n .2606071715077107 9.474e-10 deg/d
Q 2.792055954374751 6.7667e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2509  
   data-arc span      25565 days (69.99 yr)  
   first obs. used      1950-08-14  
   last obs. used      2020-08-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45885  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:31:27  

Additional Information
 Earth MOID = 1.07452 au 
 Jupiter MOID = 2.21219 au 
 T_jup = 3.494 
[ 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 4.308 km 0.327 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.287   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18546 (1997 AP4)          Discovered 1997-Jan-06 by Kobayashi, T. at Oizumi
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1997 AP4 = 1988 XR3 = 1995 SN37 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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