Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02712438213036703 3.5945e-08  
a 2.936767495164226 1.6015e-08 au
q 2.857109491397351 1.0559e-07 au
i .746897704070956 3.6603e-06 deg
node 295.4780431812064 0.00032571 deg
peri 240.6373445932497 0.00033388 deg
M 174.6198642499796 7.3923e-05 deg
tp 2457708.851015401159
(2016-Nov-16.35101540)
0.00037578 TDB
period 1838.242377717462
5.03
1.5037e-05
4.117e-08
d
yr
n .195839245337718 1.602e-09 deg/d
Q 3.016425498931102 1.645e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1428  
   data-arc span      8247 days (22.58 yr)  
   first obs. used      1997-04-02  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54829  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 04:27:36  

Additional Information
 Earth MOID = 1.86065 au 
 Jupiter MOID = 1.94693 au 
 T_jup = 3.274 
[ 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 14.4   n/a MPO347688  
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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin