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 ]  
101554 (1999 AL4)
Classification: Mars-crossing Asteroid          SPK-ID: 2101554
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3328694062743395 5.564e-08  
a 2.346302985004081 1.1765e-08 au
q 1.565290503446062 1.2756e-07 au
i 21.86495842124211 8.5798e-06 deg
node 310.1471248444861 1.6594e-05 deg
peri 86.12832717636799 2.6392e-05 deg
M .7544355270560441 1.098e-05 deg
tp 2458997.748977152107
(2020-May-28.24897715)
4.0042e-05 TDB
period 1312.727449496023
3.59
9.8733e-06
2.703e-08
d
yr
n .2742381902185481 2.0626e-09 deg/d
Q 3.1273154665621 1.5681e-08 au
  Orbit Determination Parameters
   # obs. used (total)      406  
   data-arc span      12091 days (33.10 yr)  
   first obs. used      1987-09-16  
   last obs. used      2020-10-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56502  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 19:59:53  

Additional Information
 Earth MOID = .733675 au 
 Jupiter MOID = 2.77153 au 
 T_jup = 3.393 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.0   n/a MPO395895  

101554 (1999 AL4)          Discovered 1999-Jan-09 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ show close-approach data ]
Alternate Designations
 1999 AL4 = 2003 AY 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Nov-28 11:10 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin