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97185 (1999 WR4)
Classification: Main-belt Asteroid          SPK-ID: 2097185
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04800151529033349 5.4719e-08  
a 2.972574542739339 2.0956e-08 au
q 2.82988646037438 1.693e-07 au
i 11.29440978421584 5.6938e-06 deg
node 57.95905107599049 2.0554e-05 deg
peri 329.2509679217495 4.7611e-05 deg
M 41.87766013523469 4.0884e-05 deg
tp 2458782.740322171399
(2019-Oct-26.24032217)
0.00021327 TDB
period 1871.964282749847
5.13
1.9796e-05
5.42e-08
d
yr
n .192311361556094 2.0336e-09 deg/d
Q 3.115262625104297 2.1962e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1107  
   data-arc span      7390 days (20.23 yr)  
   first obs. used      1999-11-03  
   last obs. used      2020-01-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51762  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-24 00:13:04  

Additional Information
 Earth MOID = 1.84229 au 
 Jupiter MOID = 2.15093 au 
 T_jup = 3.231 
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Orbital Elements at Epoch 2457165.5 (2015-May-23.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04663773438901497 5.3929e-08  
q 2.833035007402227 1.6604e-07 au
tp 2456889.055900773047
(2014-Aug-19.55590077)
0.00023207 TDB
node 58.08629434540918 2.0613e-05 deg
peri 325.1092437039538 4.9729e-05 deg
i 11.27988646812353 5.6859e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1107  
   data-arc span      7390 days (20.23 yr)  
   first obs. used      1999-11-03  
   last obs. used      2020-01-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51762  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-24 00:13:04  

Additional Information
 Jupiter MOID = 2.15093 au 
 T_jup = 3.231 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.908374370268438E-15 -8.894507372325152E-15 2.775042252662235E-12 -1.216736441572912E-15 5.107868600306222E-13 -6.60575441151166E-16
q -8.894507372325152E-15 2.75682936632027E-14 -9.955211806546003E-12 2.26957005606809E-15 -1.8384443972215E-12 3.905922800744498E-15
tp 2.775042252662235E-12 -9.955211806546003E-12 5.385418900528174E-8 8.239291512028602E-12 1.051794735927255E-8 -9.235184102470487E-12
node -1.216736441572912E-15 2.26957005606809E-15 8.239291512028602E-12 4.248991799017555E-10 -4.148271195709825E-10 -3.903994578071367E-11
peri 5.107868600306222E-13 -1.8384443972215E-12 1.051794735927255E-8 -4.148271195709825E-10 2.472928619436049E-9 3.641148481156878E-11
i -6.60575441151166E-16 3.905922800744498E-15 -9.235184102470487E-12 -3.903994578071367E-11 3.641148481156878E-11 3.232956672825364E-11

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 14.3   n/a MPO333598  
diameter diameter 4.838 km 0.245 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.190   0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

97185 (1999 WR4)          Discovered 1999-Nov-28 by Kobayashi, T. at Oizumi
Reference: 20050224/Numbers.arcLast Updated: 2005-02-28

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Alternate Designations
 1999 WR4 = 2001 EE2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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