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
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.

JPL Small-Body Database Browser
Search: [ help ]  
17926 Jameswu (1999 GA18)
Classification: Main-belt Asteroid          SPK-ID: 2017926
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.

[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .100142893738699 2.9406e-08  
a 2.199837659597485 8.3927e-09 au
q 1.979539550610026 6.354e-08 au
i 4.321389509519815 4.3482e-06 deg
node 16.78052849343624 6.0863e-05 deg
peri 230.3080319669126 6.7534e-05 deg
M 120.5723778800742 2.9585e-05 deg
tp 2458601.355912068012
9.7808e-05 TDB
period 1191.74784624748
n .3020773237673986 1.7287e-09 deg/d
Q 2.420135768584944 9.2331e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1411  
   data-arc span      8399 days (23.00 yr)  
   first obs. used      1996-03-24  
   last obs. used      2019-03-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54281  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 22:25:59  

Additional Information
 Earth MOID = .969514 au 
 Jupiter MOID = 2.59376 au 
 T_jup = 3.656 
[ 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 14.7   n/a MPO431705  
diameter diameter 3.307 km 0.259 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 5.343 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.177   0.058 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

17926 Jameswu           Discovered 1999 Apr. 15 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
James YW Wu (b. 1987) was awarded third place in the 2003 Intel International Science and Engineering Fair for his zoology team project. He attends the Keystone School, San Antonio, Texas, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040614/MPCPages.arcLast Updated: 2009-12-11

Alternate Designations
 1999 GA18 = 2000 QK142 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-May-26 06:57 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin