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129736 (1998 YW21)
Classification: Main-belt Asteroid          SPK-ID: 2129736
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1575550391323896 6.0387e-08  
a 2.172193293387962 1.5194e-08 au
q 1.829953294045108 1.4033e-07 au
i 4.44298533686094 5.1015e-06 deg
node 297.4551683083273 6.1393e-05 deg
peri 8.011745815746908 6.3373e-05 deg
M 57.24465011726473 1.7074e-05 deg
tp 2458814.557556365283
(2019-Nov-27.05755637)
5.5065e-05 TDB
period 1169.354333922455
3.20
1.2269e-05
3.359e-08
d
yr
n .3078622018635055 3.2301e-09 deg/d
Q 2.514433292730817 1.7588e-08 au
  Orbit Determination Parameters
   # obs. used (total)      659  
   data-arc span      7508 days (20.56 yr)  
   first obs. used      1998-12-14  
   last obs. used      2019-07-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58837  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 17:56:18  

Additional Information
 Earth MOID = .814952 au 
 Jupiter MOID = 2.70742 au 
 T_jup = 3.668 
[ 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 16.3   n/a MPO432776  
diameter diameter 1.246 km 0.300 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.343   0.181 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

129736 (1998 YW21)          Discovered 1998-Dec-26 by Spacewatch at Kitt Peak
Reference: 20060711/Numbers.arcLast Updated: 2006-07-17

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