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27721 (1989 WJ)
Classification: Main-belt Asteroid          SPK-ID: 2027721
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1334739691418979 4.9172e-08  
a 2.60090125250272 1.4312e-08 au
q 2.253748638985048 1.3063e-07 au
i 15.05731449867205 5.534e-06 deg
node 66.79698803992227 1.9882e-05 deg
peri 8.198846407628357 3.2899e-05 deg
M 358.7794285608433 2.4375e-05 deg
tp 2458605.694514049628
(2019-May-02.19451405)
0.00010374 TDB
period 1532.089804721475
4.19
1.2646e-05
3.462e-08
d
yr
n .2349731712139719 1.9395e-09 deg/d
Q 2.948053866020391 1.6222e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1392  
   data-arc span      10961 days (30.01 yr)  
   first obs. used      1989-11-20  
   last obs. used      2019-11-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50989  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 01:07:18  

Additional Information
 Earth MOID = 1.26913 au 
 Jupiter MOID = 2.35559 au 
 T_jup = 3.354 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456576.5 (2013-Oct-11.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1320980376547098 4.8892e-08  
q 2.257834468740642 1.2964e-07 au
tp 2457074.374721651011
(2015-Feb-20.87472165)
0.00010399 TDB
node 66.88029792553938 1.9896e-05 deg
peri 8.278679122807727 3.3139e-05 deg
i 15.05055281288284 5.5288e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1392  
   data-arc span      10961 days (30.01 yr)  
   first obs. used      1989-11-20  
   last obs. used      2019-11-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50989  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 01:07:18  

Additional Information
 Jupiter MOID = 2.35559 au 
 T_jup = 3.354 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.390397103199709E-15 -6.309738831455116E-15 -3.189829667532472E-12 3.839657119182189E-15 -8.242954471866653E-13 1.830733844341087E-15
q -6.309738831455116E-15 1.680590634005177E-14 8.311700525205485E-12 -9.37094242156311E-15 2.135786289184647E-12 -4.444818820968317E-15
tp -3.189829667532472E-12 8.311700525205485E-12 1.081404066707927E-8 -1.214365328039304E-11 2.786710110883026E-9 -4.409597355572191E-12
node 3.839657119182189E-15 -9.37094242156311E-15 -1.214365328039304E-11 3.958578658088746E-10 -3.849261005297014E-10 -5.688297252810549E-11
peri -8.242954471866653E-13 2.135786289184647E-12 2.786710110883026E-9 -3.849261005297014E-10 1.098192418264167E-9 5.382127562479551E-11
i 1.830733844341087E-15 -4.444818820968317E-15 -4.409597355572191E-12 -5.688297252810549E-11 5.382127562479551E-11 3.056754807608038E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.2   n/a MPO502365  
rotation period rot_per 31.902 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.]

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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