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85532 (1997 WD21)
Classification: Main-belt Asteroid          SPK-ID: 2085532
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1500758996704335 7e-08  
a 2.689469319440844 2.2464e-08 au
q 2.285844791689731 1.8656e-07 au
i 13.46533358877176 7.3073e-06 deg
node 242.7336733459915 3.552e-05 deg
peri 159.7670277100241 4.7536e-05 deg
M 62.32716435146109 3.0142e-05 deg
tp 2457121.584155429933
(2015-Apr-09.08415543)
0.00013398 JED
period 1611.010304897185
4.41
2.0184e-05
5.526e-08
d
yr
n .2234622577556853 2.7997e-09 deg/d
Q 3.093093847191958 2.5835e-08 au
  Orbit Determination Parameters
   # obs. used (total)      601  
   data-arc span      6616 days (18.11 yr)  
   first obs. used      1997-11-05  
   last obs. used      2015-12-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51148  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 16:16:02  

Additional Information
 Earth MOID = 1.29899 au 
 Jupiter MOID = 2.30532 au 
 T_jup = 3.317 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.3 mag n/a MPO320051  
rotation period rot_per 4.7682 h n/a LCDB (Rev. 2015-December); 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.]

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 | Physical Parameters | Discovery Circumstances ]
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