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 ]  
18808 (1999 JP85)
Classification: Main-belt Asteroid          SPK-ID: 2018808
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ 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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06044779339518741 4.9459e-08  
a 2.541745654402442 9.8216e-09 au
q 2.388102738222008 1.24e-07 au
i 10.34251023234407 4.4111e-06 deg
node 173.1647046520527 1.8441e-05 deg
peri 39.10498734300364 3.3868e-05 deg
M 150.276051180299 2.7482e-05 deg
tp 2458582.648884339783
(2019-Apr-09.14888434)
0.00011291 TDB
period 1480.118754057587
4.05
8.579e-06
2.349e-08
d
yr
n .2432237271591206 1.4098e-09 deg/d
Q 2.695388570582876 1.0415e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1822  
   data-arc span      9809 days (26.86 yr)  
   first obs. used      1994-04-05  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46493  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:38:28  

Additional Information
 Earth MOID = 1.3925 au 
 Jupiter MOID = 2.27186 au 
 T_jup = 3.420 
[ 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 14.25   n/a E2021B10  
diameter diameter 4.270 km 0.285 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.267   0.055 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18808 (1999 JP85)          Discovered 1999-May-15 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-May-06 19:56 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin