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
JPL Small-Body Database Browser
Search: [ help ]  
101861 (1999 LA4)
Classification: Inner Main-belt Asteroid          SPK-ID: 2101861
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03263885958344948 5.2016e-08  
a 1.940634392511606 8.3811e-09 au
q 1.877294299071607 1.0219e-07 au
i 20.95502202132555 5.8404e-06 deg
node 244.4646787520442 1.3077e-05 deg
peri 353.0611959400636 8.0678e-05 deg
M 6.151391596126355 8.2477e-05 deg
tp 2459183.627288264417
(2020-Nov-30.12728826)		 0.00022619 TDB
period 987.4474953984359
2.70		 6.3968e-06
1.751e-08		 d
yr
n .3645763462641016 2.3618e-09 deg/d
Q 2.003974485951605 8.6546e-09 au
   Orbit Determination Parameters
   # obs. used (total)      549  
   data-arc span      8100 days (22.18 yr)  
   first obs. used      1997-12-22  
   last obs. used      2020-02-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51258  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:39:03  

Additional Information
 Earth MOID = .863217 au 
 Jupiter MOID = 3.01599 au 
 T_jup = 3.821 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.13   n/a E2021B55  

101861 (1999 LA4)          Discovered 1999-Jun-09 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

Alternate Designations
 1999 LA4 = 2004 FF16 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-19 20:24 UT
(server date/time)   		NASA Home Page
Site Manager:   Ryan S. Park
Webmaster:   Alan B. Chamberlin