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JPL Small-Body Database Browser
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243678 (1999 WH20)
Classification: Main-belt Asteroid          SPK-ID: 2243678
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1608309006633669 2.3935e-07  
a 2.545457530563879 2.3594e-08 au
q 2.136069303322941 6.2718e-07 au
i 26.77607080236667 5.8464e-06 deg
node 238.2937664641449 1.0796e-05 deg
peri 170.57915194606 1.9178e-05 deg
M 288.4726085144008 1.9966e-05 deg
tp 2458895.225081519840
(2020-Feb-15.72508152)
8.5298e-05 TDB
period 1483.362207728546
4.06
2.0624e-05
5.647e-08
d
yr
n .2426919050009125 3.3743e-09 deg/d
Q 2.954845757804817 2.7389e-08 au
  Orbit Determination Parameters
   # obs. used (total)      684  
   data-arc span      7333 days (20.08 yr)  
   first obs. used      1999-10-14  
   last obs. used      2019-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46143  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 18:27:35  

Additional Information
 Earth MOID = 1.14953 au 
 Jupiter MOID = 2.42512 au 
 T_jup = 3.277 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457744.5 (2016-Dec-22.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1603665166086567 2.3834e-07  
q 2.138025014328432 6.2336e-07 au
tp 2457407.695685632677
(2016-Jan-20.19568563)
7.0455e-05 TDB
node 238.3300418367305 1.0801e-05 deg
peri 169.8643644791678 1.9443e-05 deg
i 26.75017561406028 5.8626e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      684  
   data-arc span      7333 days (20.08 yr)  
   first obs. used      1999-10-14  
   last obs. used      2019-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46143  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 18:27:35  

Additional Information
 Jupiter MOID = 2.42512 au 
 T_jup = 3.277 
Orbit Covariance (6×6)
  e q tp node peri i
e 5.680386689083273E-14 -1.485558165403003E-13 -1.06426354428984E-11 -6.708966039645028E-13 1.422180946549724E-12 -6.17492554516687E-13
q -1.485558165403003E-13 3.885827525755696E-13 2.788431799563682E-11 1.756047586201912E-12 -3.70285774397614E-12 1.615806505160417E-12
tp -1.06426354428984E-11 2.788431799563682E-11 4.96395996832503E-9 1.326166973217312E-10 5.892800180176198E-10 1.391755352117805E-10
node -6.708966039645028E-13 1.756047586201912E-12 1.326166973217312E-10 1.166526548056217E-10 -1.120791990861758E-10 -2.227624747076197E-11
peri 1.422180946549724E-12 -3.70285774397614E-12 5.892800180176198E-10 -1.120791990861758E-10 3.780242923363899E-10 1.772119148342922E-11
i -6.17492554516687E-13 1.615806505160417E-12 1.391755352117805E-10 -2.227624747076197E-11 1.772119148342922E-11 3.436959546981711E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.8   n/a MPO300152  
diameter diameter 5.253 km 0.385 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.037   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

243678 (1999 WH20)          Discovered 1999-Nov-16 by LINEAR at Socorro
Reference: 20100726/Numbers.arcLast Updated: 2010-07-28
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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