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85284 (1994 PT21)
Classification: Main-belt Asteroid          SPK-ID: 2085284
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1689483157109108 4.82e-08  
a 2.239326048228575 9.3194e-09 au
q 1.860995684052787 1.108e-07 au
i 1.167022340121684 3.502e-06 deg
node 70.88291054210958 0.00022189 deg
peri 252.5459504268638 0.00022211 deg
M 257.2788561120138 1.1466e-05 deg
tp 2459349.746265566049
(2021-May-15.24626557)
4.0287e-05 TDB
period 1223.980291154859
3.35
7.6407e-06
2.092e-08
d
yr
n .2941223830167478 1.8361e-09 deg/d
Q 2.617656412404363 1.0894e-08 au
  Orbit Determination Parameters
   # obs. used (total)      624  
   data-arc span      9388 days (25.70 yr)  
   first obs. used      1994-08-12  
   last obs. used      2020-04-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .581  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 15:34:54  

Additional Information
 Earth MOID = .849081 au 
 Jupiter MOID = 2.68912 au 
 T_jup = 3.617 
[ 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 16.4   n/a MPO417412  
diameter diameter 1.827 km 0.643 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.192   0.131 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

85284 (1994 PT21)          Discovered 1994-Aug-12 by Elst, E. W. at La Silla
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

[ show close-approach data ]
Alternate Designations
 1994 PT21 = 2000 GC44 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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