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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1267695984208462 2.4979e-08  
a 2.39464305730355 7.5679e-09 au
q 2.091075118567912 6.0376e-08 au
i 7.362218463344407 3.7334e-06 deg
node 117.7880106674997 2.3139e-05 deg
peri 280.5347718260591 2.8025e-05 deg
M 244.5203031594 1.5867e-05 deg
tp 2459830.672929531303
(2022-Sep-08.17292953)
6.0312e-05 TDB
period 1353.504199504591
3.71
6.4163e-06
1.757e-08
d
yr
n .2659762711720931 1.2609e-09 deg/d
Q 2.698210996039188 8.5273e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2035  
   data-arc span      9960 days (27.27 yr)  
   first obs. used      1994-02-08  
   last obs. used      2021-05-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45965  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:58:15  

Additional Information
 Earth MOID = 1.11313 au 
 Jupiter MOID = 2.69784 au 
 T_jup = 3.508 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1254914569446714 2.4888e-08  
q 2.094632664982138 6.0059e-08 au
tp 2457122.170702421104
(2015-Apr-09.67070242)
5.8435e-05 TDB
node 117.8711867579575 2.312e-05 deg
peri 280.2422870228023 2.8149e-05 deg
i 7.364311051755315 3.7354e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2035  
   data-arc span      9960 days (27.27 yr)  
   first obs. used      1994-02-08  
   last obs. used      2021-05-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45965  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:58:15  

Additional Information
 Jupiter MOID = 2.69784 au 
 T_jup = 3.508 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.194168037562604E-16 -1.485449001357673E-15 -3.355080732870606E-13 1.250784011667971E-15 -9.682583561006219E-14 -4.38454449210346E-16
q -1.485449001357673E-15 3.607130176828927E-15 8.499008936100965E-13 -2.451913757051785E-15 2.416009280515685E-13 1.286946442308367E-15
tp -3.355080732870606E-13 8.499008936100965E-13 3.414612526440824E-9 -7.330447538754297E-12 9.453422867664844E-10 7.438783425032766E-13
node 1.250784011667971E-15 -2.451913757051785E-15 -7.330447538754297E-12 5.345176472335123E-10 -5.318707300047991E-10 2.333222474203816E-11
peri -9.682583561006219E-14 2.416009280515685E-13 9.453422867664844E-10 -5.318707300047991E-10 7.923399994052989E-10 -2.294136985363344E-11
i -4.38454449210346E-16 1.286946442308367E-15 7.438783425032766E-13 2.333222474203816E-11 -2.294136985363344E-11 1.395311973118551E-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 15.02   n/a MPO636382  
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

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