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19561 (1999 JK81)
Classification: Main-belt Asteroid          SPK-ID: 2019561
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2420333856134594 3.1231e-08  
a 2.806067213369418 1.2186e-08 au
q 2.126905265458692 8.6265e-08 au
i 8.89909698567358 4.358e-06 deg
node 159.8304479567521 2.0858e-05 deg
peri 133.3648057404907 2.2677e-05 deg
M 206.4206794530793 9.9179e-06 deg
tp 2459932.946270716625
(2022-Dec-19.44627072)
4.9349e-05 TDB
period 1716.902096707914
4.70
1.1184e-05
3.062e-08
d
yr
n .2096799815727901 1.3659e-09 deg/d
Q 3.485229161280143 1.5135e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1987  
   data-arc span      11070 days (30.31 yr)  
   first obs. used      1990-09-28  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45326  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:43:36  

Additional Information
 Earth MOID = 1.1207 au 
 Jupiter MOID = 1.81363 au 
 T_jup = 3.262 
[ 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 13.61   n/a E2021B10  
diameter diameter 5.483 km 0.104 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.281   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19561 (1999 JK81)          Discovered 1999-May-14 by LINEAR at Socorro
Reference: 20001211/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 JK81 = 1998 FV26 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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