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39812 (1997 WE44)
Classification: Main-belt Asteroid          SPK-ID: 2039812
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1122292595361946 3.6827e-08  
a 2.262193261050026 8.6325e-09 au
q 2.008308986434612 8.4416e-08 au
i 5.23720157231452 4.0147e-06 deg
node 87.393528630136 4.9816e-05 deg
peri 344.4633365388712 5.4322e-05 deg
M 104.1458454083307 2.1233e-05 deg
tp 2458240.972237209351
(2018-May-02.47223721)
7.2708e-05 TDB
period 1242.776359413762
3.40
7.1136e-06
1.948e-08
d
yr
n .2896740006945562 1.6581e-09 deg/d
Q 2.51607753566544 9.6013e-09 au
  Orbit Determination Parameters
   # obs. used (total)      889  
   data-arc span      7823 days (21.42 yr)  
   first obs. used      1997-11-29  
   last obs. used      2019-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52339  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 02:08:31  

Additional Information
 Earth MOID = 1.02342 au 
 Jupiter MOID = 2.70735 au 
 T_jup = 3.605 
[ 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 15.8   n/a MPO337581  
diameter diameter 2.498 km 0.554 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.163   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

39812 (1997 WE44)          Discovered 1997-Nov-29 by LINEAR at Socorro
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1997 WE44 = 1999 JD5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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