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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1779205792569037 5.9745e-08  
a 2.766005914236401 2.5574e-08 AU
q 2.273876539747439 1.6171e-07 AU
i 19.10769397421583 7.0257e-06 deg
node 120.8806418018634 1.7355e-05 deg
peri 215.0543335435119 2.4697e-05 deg
M 155.0297869508077 2.0307e-05 deg
tp 2456276.913038033902
(2012-Dec-15.41303803)
9.1487e-05 JED
period 1680.266169690677
4.60
2.3303e-05
6.38e-08
d
yr
n .2142517694480946 2.9714e-09 deg/d
Q 3.258135288725363 3.0124e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1056  
   data-arc span      8886 days (24.33 yr)  
   first obs. used      1991-01-07  
   last obs. used      2015-05-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .46141  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:13:09  

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 12.2 mag n/a MPO337359  

11889 (1991 AH2)          Discovered 1991-Jan-07 by McNaught, R. H. at Siding Spring
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-Jul-06 15:42 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin