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21178 (1994 CJ17)
Classification: Main-belt Asteroid          SPK-ID: 2021178
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1268184842894196 2.4982e-08  
a 2.394305889590521 7.6493e-09 au
q 2.090663645747421 6.0314e-08 au
i 7.362352749831009 3.7452e-06 deg
node 117.7870660987172 2.3178e-05 deg
peri 280.6192261673645 2.8092e-05 deg
M 192.2845112042963 1.5843e-05 deg
tp 2459830.932435139439
(2022-Sep-08.43243514)
6.046e-05 TDB
period 1353.218347809579
3.70
6.4849e-06
1.775e-08
d
yr
n .2660324555772711 1.2749e-09 deg/d
Q 2.697948133433621 8.6194e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2019  
   data-arc span      9598 days (26.28 yr)  
   first obs. used      1994-02-08  
   last obs. used      2020-05-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45689  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:58:29  

Additional Information
 Earth MOID = 1.11233 au 
 Jupiter MOID = 2.69706 au 
 T_jup = 3.508 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.02   n/a E2021B10  
diameter diameter 2.827 km 0.683 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 12.3241 h n/a LCDB (Rev. 2020-October); 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.202   0.059 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21178 (1994 CJ17)          Discovered 1994-Feb-08 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1994 CJ17 = 1996 VO18 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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