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21239 (1995 WP17)
Classification: Main-belt Asteroid          SPK-ID: 2021239
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .298318079982991 4.7215e-08  
a 2.570989061933817 1.1623e-08 au
q 1.804016541320449 1.2619e-07 au
i 3.965157428166964 4.8206e-06 deg
node 17.78942456050562 6.0941e-05 deg
peri 316.9588355552348 6.1902e-05 deg
M 70.51667956870729 1.4862e-05 deg
tp 2458905.556979197286
(2020-Feb-26.05697920)
6.0413e-05 TDB
period 1505.735779653691
4.12
1.0211e-05
2.796e-08
d
yr
n .2390857711323015 1.6213e-09 deg/d
Q 3.337961582547184 1.5091e-08 au
  Orbit Determination Parameters
   # obs. used (total)      981  
   data-arc span      9253 days (25.33 yr)  
   first obs. used      1995-10-17  
   last obs. used      2021-02-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5247  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:42:06  

Additional Information
 Earth MOID = .795011 au 
 Jupiter MOID = 2.05894 au 
 T_jup = 3.362 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.0   n/a MPO492974  

21239 (1995 WP17)          Discovered 1995-Nov-17 by Spacewatch at Kitt Peak
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1995 WP17 = 1997 CZ24 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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