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4444 Escher (1985 SA)
Classification: Main-belt Asteroid          SPK-ID: 2004444
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1355204872299933 2.589e-08  
a 2.323757765267534 6.5311e-09 au
q 2.008840980713998 6.1958e-08 au
i 7.392053608962654 2.8761e-06 deg
node 121.2559677312674 2.3237e-05 deg
peri 181.8586290885232 2.6121e-05 deg
M 319.3454238888676 1.1767e-05 deg
tp 2459146.613937518964
(2020-Oct-24.11393752)
4.2196e-05 TDB
period 1293.852317216103
3.54
5.4547e-06
1.493e-08
d
yr
n .2782388648300976 1.173e-09 deg/d
Q 2.638674549821071 7.4161e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2623  
   data-arc span      12843 days (35.16 yr)  
   first obs. used      1985-08-13  
   last obs. used      2020-10-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43675  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:51:33  

Additional Information
 Earth MOID = .9935 au 
 Jupiter MOID = 2.57277 au 
 T_jup = 3.552 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457401.5 (2016-Jan-14.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .134887075254445 2.5916e-08  
q 2.011142420903103 6.195e-08 au
tp 2457852.182251271768
(2017-Apr-08.68225127)
4.3533e-05 TDB
node 121.2889474812393 2.3231e-05 deg
peri 181.6033393105209 2.6139e-05 deg
i 7.391912148914654 2.8761e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2623  
   data-arc span      12843 days (35.16 yr)  
   first obs. used      1985-08-13  
   last obs. used      2020-10-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43675  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:51:33  

Additional Information
 Jupiter MOID = 2.57277 au 
 T_jup = 3.552 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.716532350400743E-16 -1.599296321223493E-15 -4.913326524733196E-14 -3.825176452748825E-15 5.818714086895419E-15 -8.409086637919454E-16
q -1.599296321223493E-15 3.837839682128479E-15 5.146774229119405E-14 9.225120702482785E-15 -3.438938326888792E-14 2.037741002538207E-15
tp -4.913326524733196E-14 5.146774229119405E-14 1.895150666634218E-9 1.280804348950675E-11 5.288238649120465E-10 4.807230173097915E-13
node -3.825176452748825E-15 9.225120702482785E-15 1.280804348950675E-11 5.396710192814237E-10 -5.315323199538306E-10 -6.357710468165299E-12
peri 5.818714086895419E-15 -3.438938326888792E-14 5.288238649120465E-10 -5.315323199538306E-10 6.832510471464144E-10 6.413082770874595E-12
i -8.409086637919454E-16 2.037741002538207E-15 4.807230173097915E-13 -6.357710468165299E-12 6.413082770874595E-12 8.271710957098311E-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 13.7   n/a MPO337289  

4444 Escher           Discovered 1985 Sept. 16 by H. U. Norgaard-Nielsen, L. Hansen and P. R. Christensen at the European Southern Observatory.
The prints of Dutch graphic artist Maurits C. Escher (1898-1972) are characterized by their sophisticated use of visual illusion. The name was suggested by J. Meeus.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060413/MPCPages.arcLast Updated: 2006-04-17
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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