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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02668655444192177 3.2706e-08  
a 2.938471334871181 1.4188e-08 au
q 2.860053659617115 9.9131e-08 au
i .7468426533589686 3.5634e-06 deg
node 295.4728929354393 0.00028621 deg
peri 239.7597483366896 0.00029477 deg
M 292.9435865947924 7.0713e-05 deg
tp 2459543.203417061903
(2021-Nov-24.70341706)
0.0003618 TDB
period 1839.842363723912
5.04
1.3325e-05
3.648e-08
d
yr
n .1956689372405504 1.4171e-09 deg/d
Q 3.016889010125247 1.4566e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1618  
   data-arc span      8692 days (23.80 yr)  
   first obs. used      1997-04-02  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53151  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:52:11  

Additional Information
 Earth MOID = 1.86286 au 
 Jupiter MOID = 1.94436 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 14.44   n/a E2021B10  
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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