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39761 (1997 EN55)
Classification: Main-belt Asteroid          SPK-ID: 2039761
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1047431914445774 5.9277e-08  
a 2.596703260086724 1.7808e-08 au
q 2.324716273390702 1.581e-07 au
i 17.47986859498489 6.9069e-06 deg
node 147.3034338660633 1.4603e-05 deg
peri 345.9018931680151 3.7496e-05 deg
M 205.9483561446476 2.9158e-05 deg
tp 2459654.527105854669
(2022-Mar-16.02710585)
0.00012142 TDB
period 1528.381990709281
4.18
1.5722e-05
4.304e-08
d
yr
n .2355432098705466 2.423e-09 deg/d
Q 2.868690246782746 1.9673e-08 au
  Orbit Determination Parameters
   # obs. used (total)      998  
   data-arc span      8185 days (22.41 yr)  
   first obs. used      1997-03-02  
   last obs. used      2019-07-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58615  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 05:35:16  

Additional Information
 Earth MOID = 1.34077 au 
 Jupiter MOID = 2.15911 au 
 T_jup = 3.344 
[ 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 14.6   n/a MPO449242  
diameter diameter 4.410 km 0.148 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.120   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

39761 (1997 EN55)          Discovered 1997-Mar-02 by Spacewatch at Kitt Peak
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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