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18840 Yoshioba (1999 PT4)
Classification: Main-belt Asteroid          SPK-ID: 2018840
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .009135760420366375 1.433e-08  
a 2.388862168754118 7.3306e-09 au
q 2.367038096303103 3.2999e-08 au
i 2.635015321751562 9.4038e-07 deg
node 263.5073857093857 1.3666e-05 deg
peri 217.0202095033104 0.0001488 deg
M 144.2463473743195 0.00014094 deg
tp 2458660.134777987255
(2019-Jun-25.63477799)
0.00052814 TDB
period 1348.605933291182
3.69
6.2076e-06
1.7e-08
d
yr
n .2669423225222243 1.2287e-09 deg/d
Q 2.410686241205132 7.3976e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2625  
   data-arc span      14167 days (38.79 yr)  
   first obs. used      1981-10-30  
   last obs. used      2020-08-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44295  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:39:18  

Additional Information
 Earth MOID = 1.38247 au 
 Jupiter MOID = 2.56784 au 
 T_jup = 3.532 
[ 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 13.72   n/a E2021B10  
diameter diameter 5.315 km 0.173 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.249   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18840 Yoshioba           Discovered 1999 Aug. 8 by T. Okuni at Nanyo.
Yoshio Oba (b. 1934) is a retired professor of earth sciences at Yamagata University and an amateur astronomer who observes occultations. He is chairman of the Yamagata Astronomical Society.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020526/MPCPages.arcLast Updated: 2003-10-02

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Alternate Designations
 1999 PT4 = 1981 UQ5 = 1998 HA94 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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