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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2194893449614678 5.9551e-08  
a 2.287911240053405 5.863e-09 au
q 1.785739100644104 1.3359e-07 au
i 6.608114462468996 4.843e-06 deg
node 349.1192023387816 2.6956e-05 deg
peri 21.57487523295233 2.82e-05 deg
M 325.43783706259 6.7517e-06 deg
tp 2458721.854419527707
(2019-Aug-26.35441953)
2.385e-05 TDB
period 1264.029427472173
3.46
4.8588e-06
1.33e-08
d
yr
n .2848034960071569 1.0948e-09 deg/d
Q 2.790083379462707 7.1498e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1700  
   data-arc span      11324 days (31.00 yr)  
   first obs. used      1988-12-02  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48184  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:44:04  

Additional Information
 Earth MOID = .786057 au 
 Jupiter MOID = 2.67889 au 
 T_jup = 3.560 
[ 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 ]
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