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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 ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2197719363696609 5.7194e-08  
a 2.288172914820422 5.5795e-09 au
q 1.785296722581727 1.2833e-07 au
i 6.608656070849109 4.3305e-06 deg
node 349.1091686928743 2.5329e-05 deg
peri 21.60619381335835 2.6349e-05 deg
M 136.2615671612638 6.5834e-06 deg
tp 2458721.977275870791
(2019-Aug-26.47727587)
2.2398e-05 TDB
period 1264.246289510513
3.46
4.6241e-06
1.266e-08
d
yr
n .2847546423406025 1.0415e-09 deg/d
Q 2.791049107059117 6.8057e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1953  
   data-arc span      11794 days (32.29 yr)  
   first obs. used      1988-12-02  
   last obs. used      2021-03-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46989  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:19:49  

Additional Information
 Earth MOID = .784958 au 
 Jupiter MOID = 2.68247 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 14.47   n/a E2021B10  
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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