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43739 (1981 EP7)
Classification: Main-belt Asteroid          SPK-ID: 2043739
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1419413750606845 4.3456e-08  
a 2.375669084393296 9.6362e-09 au
q 2.038463347865354 1.0258e-07 au
i 6.325437838307392 3.1148e-06 deg
node 249.9333720941182 4.2508e-05 deg
peri 68.6839246708311 4.4379e-05 deg
M 229.8682425337753 1.4209e-05 deg
tp 2459879.957320047898
(2022-Oct-27.45732005)
5.4186e-05 TDB
period 1337.449355991492
3.66
8.1375e-06
2.228e-08
d
yr
n .2691690705051938 1.6377e-09 deg/d
Q 2.712874820921237 1.1004e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1461  
   data-arc span      14705 days (40.26 yr)  
   first obs. used      1981-02-02  
   last obs. used      2021-05-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4637  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 21:06:24  

Additional Information
 Earth MOID = 1.03471 au 
 Jupiter MOID = 2.56466 au 
 T_jup = 3.520 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457382.5 (2015-Dec-26.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1427796153036868 4.3472e-08  
q 2.036196143808953 1.0272e-07 au
tp 2457205.132225116218
(2015-Jul-01.63222512)
4.7988e-05 TDB
node 249.9788262219052 4.2544e-05 deg
peri 68.64457925957439 4.4397e-05 deg
i 6.322849202968177 3.1142e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1461  
   data-arc span      14705 days (40.26 yr)  
   first obs. used      1981-02-02  
   last obs. used      2021-05-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4637  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 21:06:24  

Additional Information
 Jupiter MOID = 2.56466 au 
 T_jup = 3.520 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.889838024066686E-15 -4.45149849898511E-15 8.707005103998687E-13 8.970123218602596E-15 1.878633623767757E-13 -4.753981357019858E-15
q -4.45149849898511E-15 1.055209769905171E-14 -1.983336087191689E-12 -2.265220530783329E-14 -4.208574880310219E-13 1.12618700034659E-14
tp 8.707005103998687E-13 -1.983336087191689E-12 2.302812913376144E-9 9.32912674013175E-12 6.323074691141782E-10 -4.262603799844775E-12
node 8.970123218602596E-15 -2.265220530783329E-14 9.32912674013175E-12 1.809972072405388E-9 -1.796866416770187E-9 -1.156078611478145E-11
peri 1.878633623767757E-13 -4.208574880310219E-13 6.323074691141782E-10 -1.796866416770187E-9 1.971113804687619E-9 1.044101917430968E-11
i -4.753981357019858E-15 1.12618700034659E-14 -4.262603799844775E-12 -1.156078611478145E-11 1.044101917430968E-11 9.698330970506973E-12

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.15   n/a MPCxxxxx  
diameter diameter 3.285 km 0.687 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.149   0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

43739 (1981 EP7)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20020822/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EP7 = 2001 VH44 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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