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21171 (1994 CG1)
Classification: Main-belt Asteroid          SPK-ID: 2021171
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .198027887253062 3.5126e-08  
a 2.253399656535402 7.5317e-09 au
q 1.807163683414921 7.7868e-08 au
i 5.002869042449631 4.7336e-06 deg
node 10.91772448684749 4.3875e-05 deg
peri 286.731717241288 4.573e-05 deg
M 198.2668108174988 1.5772e-05 deg
tp 2459755.575951645870
(2022-Jun-25.07595165)
5.5487e-05 TDB
period 1235.537019968278
3.38
6.1944e-06
1.696e-08
d
yr
n .2913712775755135 1.4608e-09 deg/d
Q 2.699635629655883 9.0232e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1533  
   data-arc span      10316 days (28.24 yr)  
   first obs. used      1992-10-27  
   last obs. used      2021-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53799  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:51:13  

Additional Information
 Earth MOID = .797497 au 
 Jupiter MOID = 2.52872 au 
 T_jup = 3.594 
[ 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 14.56   n/a E2021B10  
diameter diameter 2.929 km 0.447 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.668 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.358   0.189 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21171 (1994 CG1)          Discovered 1994-Feb-07 by Kobayashi, T. at Oizumi
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1994 CG1 = 1998 KZ17 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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