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21378 (1998 CJ4)
Classification: Main-belt Asteroid          SPK-ID: 2021378
[ 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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1972159207778846 2.2891e-08  
a 2.618444898957101 9.2752e-09 au
q 2.102045877203122 5.9313e-08 au
i 11.30659970818551 5.2727e-07 deg
node 325.427687058968 3.9116e-06 deg
peri 119.8603810111503 4.4438e-06 deg
M 185.6223881388804 6.3289e-06 deg
tp 2459950.138375141768
(2023-Jan-05.63837514)		 2.9935e-05 TDB
period 1547.617335566967
4.24		 8.2231e-06
2.251e-08		 d
yr
n .2326156419462144 1.236e-09 deg/d
Q 3.13484392071108 1.1104e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1934  
   data-arc span      14405 days (39.44 yr)  
   first obs. used      1981-02-03  
   last obs. used      2020-07-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42081  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:44:18  

Additional Information
 Earth MOID = 1.14353 au 
 Jupiter MOID = 2.13219 au 
 T_jup = 3.351 
[ 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 13.54   n/a E2021B10  
diameter diameter 10.753 km 0.269 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.073   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

21378 (1998 CJ4)          Discovered 1998-Feb-06 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 CJ4 = 1981 CK1 = 1996 RV23 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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