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
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
85522 (1997 WT4)
Classification: Main-belt Asteroid          SPK-ID: 2085522
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1874184234825299 7.1428e-08  
a 2.419398116011298 1.3296e-08 au
q 1.965958335331857 1.7066e-07 au
i 3.547723796147873 6.4003e-06 deg
node 41.48194365720354 7.6426e-05 deg
peri 335.6344999238812 7.7526e-05 deg
M 14.14902822906018 1.4349e-05 deg
tp 2458946.476396863108
(2020-Apr-06.97639686)
5.4533e-05 TDB
period 1374.546492835206
3.76
1.1331e-05
3.102e-08
d
yr
n .2619045640700348 2.159e-09 deg/d
Q 2.872837896690738 1.5788e-08 au
  Orbit Determination Parameters
   # obs. used (total)      415  
   data-arc span      7479 days (20.48 yr)  
   first obs. used      1997-10-29  
   last obs. used      2018-04-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59934  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-04 03:05:59  

Additional Information
 Earth MOID = .968399 au 
 Jupiter MOID = 2.58869 au 
 T_jup = 3.488 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.3   n/a MPO439614  
diameter diameter 3.091 km 0.429 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.056   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

85522 (1997 WT4)          Discovered 1997-Nov-20 by Spacewatch at Kitt Peak
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

Alternate Designations
 1997 WT4 = 2001 YH45 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Apr-02 23:22 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin