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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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04800152957728181 4.9255e-08  
a 2.972574537974709 1.9478e-08 au
q 2.829886413369441 1.5015e-07 au
i 11.29441120943967 5.3459e-06 deg
node 57.95904716655143 1.955e-05 deg
peri 329.2509756411752 4.6479e-05 deg
M 41.87765747364968 4.0346e-05 deg
tp 2458782.740336534935
(2019-Oct-26.24033654)
0.00021035 TDB
period 1871.964278249093
5.13
1.8399e-05
5.037e-08
d
yr
n .1923113620184672 1.8902e-09 deg/d
Q 3.115262662579976 2.0413e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1172  
   data-arc span      7665 days (20.99 yr)  
   first obs. used      1999-11-03  
   last obs. used      2020-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51092  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 20:19:27  

Additional Information
 Earth MOID = 1.84229 au 
 Jupiter MOID = 2.15093 au 
 T_jup = 3.231 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457377.5 (2015-Dec-21.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0466010690227202 4.8787e-08  
q 2.834090028961902 1.478e-07 au
tp 2456891.010028721275
(2014-Aug-21.51002872)
0.00022604 TDB
node 58.07766319806819 1.9607e-05 deg
peri 325.5429035945344 4.8228e-05 deg
i 11.27839807907437 5.3378e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1172  
   data-arc span      7665 days (20.99 yr)  
   first obs. used      1999-11-03  
   last obs. used      2020-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51092  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 20:19:27  

Additional Information
 Jupiter MOID = 2.15093 au 
 T_jup = 3.231 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.380205674005884E-15 -7.155058628659848E-15 1.546388318853355E-12 -9.057664320364186E-16 2.650285298466529E-13 -4.737614752960157E-16
q -7.155058628659848E-15 2.184369844576425E-14 -5.924261883780287E-12 2.886738116606778E-15 -1.033213342157058E-12 2.617007268321499E-15
tp 1.546388318853355E-12 -5.924261883780287E-12 5.109197354584036E-8 -1.219294258180125E-13 9.971663069120167E-9 -6.122502241434175E-12
node -9.057664320364186E-16 2.886738116606778E-15 -1.219294258180125E-13 3.844468370648228E-10 -3.767830502940813E-10 -2.6726197367266E-11
peri 2.650285298466529E-13 -1.033213342157058E-12 9.971663069120167E-9 -3.767830502940813E-10 2.325916835228158E-9 2.493770616223701E-11
i -4.737614752960157E-16 2.617007268321499E-15 -6.122502241434175E-12 -2.6726197367266E-11 2.493770616223701E-11 2.849262180974421E-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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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2107-Jun-19 19:14 00:05 Thisb 0.0396969727731551 0.0396779601455022 0.0397159961553609 5.26118331195587 5.26118327930957 2490795.301493125 4.67576497410014 1401.05250450765 52.7357129743543 -47.4611596263713 82994.3178591715 T 23 CATAB v2.0f-lin.ifort 2020-Nov-12 20:19:30 2020-Nov-12 20:19

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