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20494 (1999 PM1)
Classification: Main-belt Asteroid          SPK-ID: 2020494
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2427165015491159 4.4525e-08  
a 2.682634320412394 1.5742e-08 au
q 2.031514703226308 1.1913e-07 au
i 28.14113595503616 4.5469e-06 deg
node 95.67917681227316 1.0944e-05 deg
peri 258.5768470265128 1.4627e-05 deg
M 285.0432884858828 1.179e-05 deg
tp 2459534.655540052399
(2021-Nov-16.15554005)		 5.377e-05 TDB
period 1604.872892485514
4.39		 1.4127e-05
3.868e-08		 d
yr
n .2243168301275607 1.9745e-09 deg/d
Q 3.333753937598481 1.9563e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1306  
   data-arc span      13763 days (37.68 yr)  
   first obs. used      1982-11-19  
   last obs. used      2020-07-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49034  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:22:21  

Additional Information
 Earth MOID = 1.19189 au 
 Jupiter MOID = 2.42686 au 
 T_jup = 3.168 
[ 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 14.02   n/a E2021B10  
diameter diameter 8.676 km 0.089 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.078   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20494 (1999 PM1)          Discovered 1999-Aug-03 by McNaught, R. H. at Siding Spring
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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