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18818 Yasuhiko (1999 MB2)
Classification: Main-belt Asteroid          SPK-ID: 2018818
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1374504091195906 1.6434e-08  
a 2.284050076295002 5.6965e-09 au
q 1.970106458858622 3.6556e-08 au
i 6.08670383395866 4.3531e-07 deg
node 129.8539106338347 1.1262e-05 deg
peri 87.58489113721825 1.2182e-05 deg
M 195.0683763962596 5.2529e-06 deg
tp 2459974.141373922336
(2023-Jan-29.64137392)
1.9441e-05 TDB
period 1260.830943565178
3.45
4.7169e-06
1.291e-08
d
yr
n .2855259873159911 1.0682e-09 deg/d
Q 2.597993693731382 6.4795e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2892  
   data-arc span      25872 days (70.83 yr)  
   first obs. used      1950-04-12  
   last obs. used      2021-02-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42334  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:04:24  

Additional Information
 Earth MOID = .97481 au 
 Jupiter MOID = 2.38602 au 
 T_jup = 3.583 
[ 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 13.74   n/a E2021B10  
diameter diameter 4.886 km 0.199 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.204   0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18818 Yasuhiko           Discovered 1999 June 21 by T. Okuni at Nanyo.
Yasuhiko Takahashi (b. 1934) is the younger brother-in-law of the discoverer.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20021120/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 1999 MB2 = 1991 AN1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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