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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1325635422675929 7.157e-08  
a 2.602084235273146 2.1717e-08 au
q 2.257142731766677 1.8905e-07 au
i 15.04790306729305 8.3752e-06 deg
node 66.83855230298461 2.3245e-05 deg
peri 8.570942468505894 3.7734e-05 deg
M 76.3730633872441 2.5928e-05 deg
tp 2457075.249356653253
(2015-Feb-21.74935665)
0.00011078 JED
period 1533.135197302895
4.20
1.9193e-05
5.255e-08
d
yr
n .2348129510256599 2.9396e-09 deg/d
Q 2.947025738779614 2.4596e-08 au
  Orbit Determination Parameters
   # obs. used (total)      871  
   data-arc span      9259 days (25.35 yr)  
   first obs. used      1989-11-20  
   last obs. used      2015-03-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48099  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 17:26:08  

Additional Information
 Earth MOID = 1.27208 au 
 Jupiter MOID = 2.36211 au 
 T_jup = 3.353 
[ 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. 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.]

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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