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 ]  
20408 (1998 QW31)
Classification: Main-belt Asteroid          SPK-ID: 2020408
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2196509583083893 5.8644e-08  
a 2.288247279834049 5.7384e-09 au
q 1.785631571971935 1.3147e-07 au
i 6.608072854326749 4.3435e-06 deg
node 349.1122994459523 2.6744e-05 deg
peri 21.60450843811384 2.7973e-05 deg
M 79.32361461591294 6.703e-06 deg
tp 2458721.918126882929
(2019-Aug-26.41812688)
2.321e-05 TDB
period 1264.307921515554
3.46
4.7559e-06
1.302e-08
d
yr
n .2847407612288468 1.0711e-09 deg/d
Q 2.790862987696163 6.9988e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1866  
   data-arc span      11654 days (31.91 yr)  
   first obs. used      1988-12-02  
   last obs. used      2020-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4711  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:02:59  

Additional Information
 Earth MOID = .7868 au 
 Jupiter MOID = 2.68161 au 
 T_jup = 3.559 
[ 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 14.4   n/a MPO435889  
diameter diameter 2.967 km 0.453 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.419   0.101 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20408 (1998 QW31)          Discovered 1998-Aug-17 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 QW31 = 1991 RU11 
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-26 14:05 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin