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 ]  
11889 (1991 AH2)
Classification: Main-belt Asteroid          SPK-ID: 2011889
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1779205798754564 6.0086e-08  
a 2.766005921446445 2.7497e-08 AU
q 2.273876543963747 1.6226e-07 AU
i 19.10769453940521 7.4444e-06 deg
node 120.8806398127829 1.975e-05 deg
peri 215.054328809013 2.8192e-05 deg
M 155.0297906630241 2.1272e-05 deg
tp 2456276.913017878260
(2012-Dec-15.41301788)
9.7413e-05 JED
period 1680.266176260508
4.60
2.5055e-05
6.86e-08
d
yr
n .2142517686103715 3.1948e-09 deg/d
Q 3.258135298929143 3.2389e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      858  
   data-arc span      8727 days (23.89 yr)  
   first obs. used      1991-01-07  
   last obs. used      2014-11-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49105  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 02:13:56  

Additional Information
 Earth MOID = 1.28476 AU 
 T_jup = 3.237 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.1 mag n/a MPO240301  

11889 (1991 AH2)          Discovered 1991-Jan-07 by McNaught, R. H. at Siding Spring (413)
Reference: 19991026/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 AH2 = 1998 KZ55 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2015-Jan-30 02:39 UT
(server date/time)  
NASA Home Page
Site Manager:   Donald K. Yeomans
Webmaster  Alan B. Chamberlin