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21978 (1999 XW3)
Classification: Main-belt Asteroid          SPK-ID: 2021978
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1045815995664179 6.0743e-08  
a 3.11689106837522 2.6278e-08 au
q 2.790921614770258 2.0584e-07 au
i 11.69236620890551 3.8247e-06 deg
node 223.6906290650319 2.093e-05 deg
peri 124.6388847097751 3.2418e-05 deg
M 33.46746321205038 2.0388e-05 deg
tp 2459209.646534273070
(2020-Dec-26.14653427)
0.00011468 TDB
period 2009.929681120091
5.50
2.5418e-05
6.959e-08
d
yr
n .1791107437148645 2.2651e-09 deg/d
Q 3.442860521980182 2.9026e-08 au
  Orbit Determination Parameters
   # obs. used (total)      897  
   data-arc span      8627 days (23.62 yr)  
   first obs. used      1997-06-07  
   last obs. used      2021-01-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47165  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:56:49  

Additional Information
 Earth MOID = 1.80552 au 
 Jupiter MOID = 2.04213 au 
 T_jup = 3.177 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457952.5 (2017-Jul-18.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1081499736956259 6.0953e-08  
q 2.778237747918848 2.076e-07 au
tp 2457204.337633231289
(2015-Jun-30.83763323)
0.00012185 TDB
node 223.8423650754911 2.0872e-05 deg
peri 125.4568377746475 3.1669e-05 deg
i 11.71412109193971 3.831e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      897  
   data-arc span      8627 days (23.62 yr)  
   first obs. used      1997-06-07  
   last obs. used      2021-01-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47165  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:56:49  

Additional Information
 Jupiter MOID = 2.04213 au 
 T_jup = 3.177 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.715296850141977E-15 -1.260971464361553E-14 3.459906956503774E-12 -1.126019533165692E-14 7.348030521022143E-13 -1.151837503702938E-14
q -1.260971464361553E-14 4.30995971900698E-14 -1.242296239547714E-11 3.953428301832522E-14 -2.603986364177844E-12 3.946449845444933E-14
tp 3.459906956503774E-12 -1.242296239547714E-11 1.484682452073688E-8 -2.401760146463139E-11 2.921613877299481E-9 -4.269561443291328E-12
node -1.126019533165692E-14 3.953428301832522E-14 -2.401760146463139E-11 4.356439580060683E-10 -4.310145501203894E-10 -1.207737640630045E-11
peri 7.348030521022143E-13 -2.603986364177844E-12 2.921613877299481E-9 -4.310145501203894E-10 1.002901334734168E-9 1.087767957758338E-11
i -1.151837503702938E-14 3.946449845444933E-14 -4.269561443291328E-12 -1.207737640630045E-11 1.087767957758338E-11 1.46768119639309E-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 14.37   n/a E2021B10  

21978 (1999 XW3)          Discovered 1999-Dec-04 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XW3 = 1997 LW7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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