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85532 (1997 WD21)
Classification: Main-belt Asteroid          SPK-ID: 2085532
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .151713810522903 5.1466e-08  
a 2.688272993186196 1.6474e-08 au
q 2.280424853664108 1.3614e-07 au
i 13.49262008384097 5.7759e-06 deg
node 242.605305693271 2.6146e-05 deg
peri 160.5864540963362 3.3605e-05 deg
M 329.6572999293875 2.0794e-05 deg
tp 2458736.193862247583
(2019-Sep-09.69386225)
9.3341e-05 TDB
period 1609.935513169497
4.41
1.4799e-05
4.052e-08
d
yr
n .2236114409894991 2.0555e-09 deg/d
Q 3.096121132708283 1.8973e-08 au
  Orbit Determination Parameters
   # obs. used (total)      833  
   data-arc span      8030 days (21.98 yr)  
   first obs. used      1997-11-05  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51611  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 10:12:04  

Additional Information
 Earth MOID = 1.29409 au 
 Jupiter MOID = 2.2955 au 
 T_jup = 3.317 
[ 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 14.3   n/a MPO320051  
diameter diameter 3.916 km 0.205 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.768 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.219   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

85532 (1997 WD21)          Discovered 1997-Nov-23 by Shimizu, Y., Urata, T. at Nachi-Katsuura
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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