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21359 Geng (1997 GN22)
Classification: Main-belt Asteroid          SPK-ID: 2021359
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02661649560747277 3.2181e-08  
a 2.938577796761162 1.3877e-08 au
q 2.860363153741452 9.8128e-08 au
i .7466812756587295 3.5545e-06 deg
node 295.4707168305143 0.00027353 deg
peri 239.5245926688914 0.0002823 deg
M 331.516744254838 6.981e-05 deg
tp 2459542.076523790827
(2021-Nov-23.57652379)
0.00035693 TDB
period 1839.942351871038
5.04
1.3033e-05
3.568e-08
d
yr
n .1956583039864895 1.3859e-09 deg/d
Q 3.016792439780873 1.4246e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1659  
   data-arc span      8806 days (24.11 yr)  
   first obs. used      1997-04-02  
   last obs. used      2021-05-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52734  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:32:44  

Additional Information
 Earth MOID = 1.86457 au 
 Jupiter MOID = 1.94363 au 
 T_jup = 3.273 
[ 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 14.45   n/a MPCxxxxx  
diameter diameter 3.929 km 0.696 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.218   0.058 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21359 Geng           Discovered 1997 Apr. 6 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Sherri Yifan Geng (b. 1987) is a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors, for her medicine and health project. She attends the Montgomery Blair High School, Silver Spring, Maryland.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050224/MPCPages.arcLast Updated: 2005-02-28

[ show close-approach data ]
Alternate Designations
 1997 GN22 = 1999 TB28 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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