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4498 Shinkoyama (1989 AG1)
Classification: Main-belt Asteroid          SPK-ID: 2004498
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1228936254539779 4.6942e-08  
a 3.001235427420815 1.6182e-08 au
q 2.632402724904152 1.377e-07 au
i 8.875259423778935 4.1353e-06 deg
node 280.6428805638552 2.8194e-05 deg
peri 74.11023533859141 3.2386e-05 deg
M 126.8815964168699 1.6948e-05 deg
tp 2458331.163271189008
(2018-Jul-31.66327119)
8.8823e-05 TDB
period 1899.103015541183
5.20
1.5359e-05
4.205e-08
d
yr
n .1895631764332761 1.5331e-09 deg/d
Q 3.370068129937478 1.817e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2337  
   data-arc span      19547 days (53.52 yr)  
   first obs. used      1966-10-20  
   last obs. used      2020-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41332  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 02:08:30  

Additional Information
 Earth MOID = 1.64453 au 
 Jupiter MOID = 2.09935 au 
 T_jup = 3.223 
[ 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 11.7   n/a MPO458875  
diameter diameter 16.824 km 0.287 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.2068 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.143   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4498 Shinkoyama (1989 AG1)          Discovered 1989-Jan-05 by Seki, T. at Geisei
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1989 AG1 = 1966 UU = 1971 OO1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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