Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
97185 (1999 WR4)
Classification: Main-belt Asteroid          SPK-ID: 2097185
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]

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.


[ revert to old Java-based viewer ]

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 
[ 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 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

[ hide close-approach data ]
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 22 CATAB v2.0f-lin.ifort 2020-Feb-24 00:13:20 2020-Feb-24 00:13

Alternate Designations
 1999 WR4 = 2001 EE2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Oct-21 20:19 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin