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27721 (1989 WJ)
Classification: Main-belt Asteroid          SPK-ID: 2027721
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1329294275473167 6.2593e-08  
a 2.601213441784962 1.8439e-08 au
q 2.255435628040102 1.6088e-07 au
i 15.05310852897779 6.6311e-06 deg
node 66.804815154585 2.2505e-05 deg
peri 8.476932011226264 3.656e-05 deg
M 123.444205886448 2.5494e-05 deg
tp 2457075.050938523763
(2015-Feb-21.55093852)
0.00010885 JED
period 1532.365660851255
4.20
1.6293e-05
4.461e-08
d
yr
n .2349308713952868 2.498e-09 deg/d
Q 2.946991255529822 2.089e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1008  
   data-arc span      9644 days (26.40 yr)  
   first obs. used      1989-11-20  
   last obs. used      2016-04-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50747  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:50:00  

Additional Information
 Earth MOID = 1.26943 au 
 Jupiter MOID = 2.36093 au 
 T_jup = 3.354 
[ 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 14.2 mag n/a MPO333073  
rotation period rot_per 31.9024 h n/a LCDB (Rev. 2016-February); 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. (2016) Astron. J. 150, A75.]

27721 (1989 WJ)          Discovered 1989-Nov-20 by Oshima, Y. at Gekko
Reference: 20010902/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1989 WJ = 1999 CP127 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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