Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
8938 (1997 AF21)
Classification: Main-belt Asteroid          SPK-ID: 2008938
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2039753264592822 6.7813e-08  
a 2.144148298327546 1.0878e-08 AU
q 1.70679494919907 1.4824e-07 AU
i 2.484217098682347 6.9499e-06 deg
node 2.114588921467435 0.0001035 deg
peri 339.3813917465549 0.00010408 deg
M 3.772738703352105 1.3089e-05 deg
tp 2456988.481925744930
(2014-Nov-26.98192575)
4.1663e-05 JED
period 1146.78144234612
3.14
8.727e-06
2.389e-08
d
yr
n .3139220663211126 2.3889e-09 deg/d
Q 2.581501647456022 1.3097e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1047  
   data-arc span      26893 days (73.63 yr)  
   first obs. used      1939-10-18  
   last obs. used      2013-06-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52942  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 19:24:10  

Additional Information
 Earth MOID = .699298 AU 
 T_jup = 3.682 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.6 mag n/a MPO263429  

8938 (1997 AF21)          Discovered 1997-Jan-09 by Ueda, S., Kaneda, H. at Kushiro (399)
Reference: 19980610/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1997 AF21 = 1939 UD = 1942 RG = 1986 RX12 = 1986 SK2 = 1989 NS 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2014-Nov-27 04:16 UT
(server date/time)  
NASA Home Page
Site Manager:   Donald K. Yeomans
Webmaster  Alan B. Chamberlin