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15847 (1995 WA2)
Classification: Main-belt Asteroid          SPK-ID: 2015847
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .193182850220485 2.9963e-08  
a 2.350706785043682 6.8e-09 au
q 1.89659054827631 7.166e-08 au
i 3.120944574871636 3.6101e-06 deg
node 215.8789152097897 6.2465e-05 deg
peri 256.76068692706 6.3195e-05 deg
M 244.2518834173381 9.4738e-06 deg
tp 2459423.760314635972
(2021-Jul-28.26031464)
3.5041e-05 TDB
period 1316.424990467397
3.60
5.7121e-06
1.564e-08
d
yr
n .2734679169773144 1.1866e-09 deg/d
Q 2.804823021811053 8.1136e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1242  
   data-arc span      10069 days (27.57 yr)  
   first obs. used      1993-04-17  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49635  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:01:08  

Additional Information
 Earth MOID = .916025 au 
 Jupiter MOID = 2.31802 au 
 T_jup = 3.531 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457253.5 (2015-Aug-19.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1923366619115092 2.9741e-08  
q 1.898947073853894 7.1024e-08 au
tp 2456787.780865575550
(2014-May-10.28086558)
3.4405e-05 TDB
node 215.9752748385637 6.2357e-05 deg
peri 256.2691818261978 6.3111e-05 deg
i 3.122532385151048 3.6134e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1242  
   data-arc span      10069 days (27.57 yr)  
   first obs. used      1993-04-17  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49635  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:01:08  

Additional Information
 Jupiter MOID = 2.31802 au 
 T_jup = 3.531 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.845115587235574E-16 -2.106242071717161E-15 2.401157991786311E-13 7.117980275199219E-15 7.920927720607316E-14 -1.290966193128262E-15
q -2.106242071717161E-15 5.044399301421483E-15 -5.756371873879768E-13 -1.619093160594169E-14 -1.87379170523786E-13 3.12994173488953E-15
tp 2.401157991786311E-13 -5.756371873879768E-13 1.183705598732306E-9 1.046169920893784E-11 3.446685092951797E-10 -8.543105480173518E-13
node 7.117980275199219E-15 -1.619093160594169E-14 1.046169920893784E-11 3.88834118070477E-9 -3.878997261011692E-9 -4.055850721058632E-11
peri 7.920927720607316E-14 -1.87379170523786E-13 3.446685092951797E-10 -3.878997261011692E-9 3.983047143190941E-9 4.025459353569989E-11
i -1.290966193128262E-15 3.12994173488953E-15 -8.543105480173518E-13 -4.055850721058632E-11 4.025459353569989E-11 1.305648439244913E-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 15.2   n/a MPO439203  

15847 (1995 WA2)          Discovered 1995-Nov-18 by Kobayashi, T. at Oizumi
Reference: 20000726/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1995 WA2 = 1999 XY21 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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