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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1501827910951533 8.4107e-08  
a 2.689460813937197 2.4685e-08 AU
q 2.285550082359066 2.294e-07 AU
i 13.46554560591597 7.858e-06 deg
node 242.7393489807497 3.8046e-05 deg
peri 159.6709506290296 4.9499e-05 deg
M 333.0067595636373 3.0207e-05 deg
tp 2457121.294950599374
(2015-Apr-08.79495060)
0.00013565 JED
period 1611.002662621946
4.41
2.2179e-05
6.072e-08
d
yr
n .2234633178160558 3.0765e-09 deg/d
Q 3.093371545515328 2.8392e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      554  
   data-arc span      6244 days (17.10 yr)  
   first obs. used      1997-11-05  
   last obs. used      2014-12-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52308  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 17:57:28  

Additional Information
 Earth MOID = 1.29956 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-July); 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., in press.]

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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