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 ]  
21490 (1998 JW)
Classification: Main-belt Asteroid          SPK-ID: 2021490
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0854346515227716 3.6052e-08  
a 2.719582408873423 1.3834e-08 au
q 2.487235833483862 1.0151e-07 au
i 11.68041096771046 5.0967e-06 deg
node 219.8443484079106 2.0029e-05 deg
peri 68.99763674376617 3.7704e-05 deg
M 356.4868442062486 3.2948e-05 deg
tp 2459412.486252581198
(2021-Jul-16.98625258)
0.00014995 TDB
period 1638.14281719799
4.48
1.2499e-05
3.422e-08
d
yr
n .2197610588164545 1.6768e-09 deg/d
Q 2.951928984262983 1.5015e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1387  
   data-arc span      9375 days (25.67 yr)  
   first obs. used      1995-10-27  
   last obs. used      2021-06-27  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50321  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:08:17  

Additional Information
 Earth MOID = 1.49934 au 
 Jupiter MOID = 2.17148 au 
 T_jup = 3.324 
[ 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 14.3   n/a MPO467960  
diameter diameter 6.612 km 0.315 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.101   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21490 (1998 JW)          Discovered 1998-May-01 by JPL/GEODSS NEAT at Haleakala
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 JW = 1995 UE7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jul-27 03:43 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin