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 ]  
42491 (1991 TF)
Classification: Main-belt Asteroid          SPK-ID: 2042491
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 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2614992444975311 8.3922e-08  
a 2.647966006325521 2.638e-08 AU
q 1.955524896216253 2.1816e-07 AU
i 14.62781601689279 9.7616e-06 deg
node 173.3195883087715 3.0761e-05 deg
peri 199.5308525145115 3.5034e-05 deg
M 136.4029184557532 2.0872e-05 deg
tp 2456404.167887367802
(2013-Apr-21.66788737)
8.564e-05 JED
period 1573.863396604889
4.31
2.3519e-05
6.439e-08
d
yr
n .228736496939052 3.4181e-09 deg/d
Q 3.340407116434789 3.3278e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      373  
   data-arc span      22857 days (62.58 yr)  
   first obs. used      1952-08-24  
   last obs. used      2015-03-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .57307  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 17:59:00  

Additional Information
 Earth MOID = .960279 AU 
 T_jup = 3.297 
[ 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 14.7 mag n/a MPO319594  

42491 (1991 TF)          Discovered 1991-Oct-01 by McNaught, R. H. at Siding Spring
Reference: 20020624/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 TF = 2002 EM147 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2015-Apr-28 02:05 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin